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1. 3 P J820 SIZE SWITCH P J824 5 TRAY 4 PAPER TRAY 5 PAPER SIZE SWITCH SIZE SWITCH 7750 083 10 27 Map 23 HCF Lower Tray Rear P J826 555 564 P J547 P J842 P J674 P S61 541 549 548 7750 084 10 28 Phaser 7750 Printer Service Manual 662 0612 800100 m 13138135 SN mOn 1 0 X40 6 20110 a 0 X40 201103 je SEE y 00 14 LAN 335 814881 N 1 MD o oc mor pans e 2186 A uw N e N HOLMS HOLMS YOWNI YOANI MOHI 2 L MOT Ave m 000 10 29 24 VDC 2 of 2 092 0522 NYO 12 L 8188 2 97 69 SL SdAH NYO 2 91 SdAH 5287 gt wa 180 2 4 N80 re wnya i oer 68 00 NYO 6027 vesr 4 281 soiowwnua cea ma 38134810 YINOL NYO oy 66
2. HA err 80084 evar GO 80088 3n ew NOLLVOINQIAWOO 9114 NOLVOINNWWO9 re NOW 01 YJHSINIH 318000 318000 01 NIW NOW NIN u3HSINIH NOLLVJINQIWINO SAMd 2721 Phaser 7750 Printer Service Manual 11 32 Copy and Drive Delivery 655 06 31009 31403 921 521 33141939 5 vel qu vau TWNOIS 035836 TN 401 Vul H 01 u3dVd aur NYIA Q HNI 181014 0 8 101 eouejsiseJ Alf 10188 Y JUANDA uSuM Q 8310N i woo 01 i 4 woo 20 1 NO 20105 iow NO E NO 1 gt gt TA lt 3yvu8 YOLOW LHOdSNVYL m LA 60797 3010 i wo NO HOLOW 1100 21 06624 ana 1938 USHSINI4 101 20186 208 1 01988 698 86587 sser 03838 TINI WOSN3S TINS SNILYOHS 401 812 1 06690 0103105 NI 31v9 YOSNAS 1105 Av uL 401 2114 H0SN3S TINA 401 998 9698 6 OIA
3. 922 0921 anen Cr qnoi 1294010 0 988919 99115159 SPY Jojsiuuau 5 109 101910 ue 1 19 eoueApe r 4 5 038 38 1 888 2 1 umog 12913 260 21 ung buiddojs YOSNIS IWOH 1 12303 HOSNAS 1 810190 auo 19800 piousjos 19373 138 195 101041 10913 0 012 211 06690 81114 YOSNIS LO z L uonesado ayy 1233 j 20 8 dn dwerg 913 76 210 d cc T umog PIN durer 12913 6 21 7 gt 4 1 9915 26 WNOIS 0353 i angi age Duis D d woo 20 ug premyoeg 116 211 1 138 3ioH 136 1 uo 10621 1 112 21 08290 288 uo eu 684114 YOSNIS S310N Y3HSINIS 135 0319373 145 YSHSINI4 2 2 NO 1 NO 0109105 72 135 01083105 140 21 40110 138 10 0 211 08620 NO NI
4. 6 4 RegiCon Adjustment 6 5 RegiCon 1 Fine Skew Adjustment 6 7 RegiCon 2 In Out Skew 6 8 RegiCon 3 Center Skew Adjustment 6 9 RegiCon 4 Coarse Skew 6 10 Coarse RegiCon 6 12 ATC Sensor 6 14 Additional 6 15 Resetting 6 16 PostScript NVRAM 5 6 16 Service Diagnostics NVRAM Resets 6 19 PostScript NVRAM 6 19 Clear Tech Rep 5 6 20 7 Cleaning and Maintenance Service Preventive Maintenance 7 2 dh bowls Mote Showa bes 7 2 xvi Phaser 7750 Printer Service Manual 8 Service Parts Disassembly OvervieW 8 2 Standard Orientation of the Printer for Disassembly 8 2 General Notes on Disassembly 8 3 dhe ete RP SR 8 4 Optional Lower
5. AAAA 03834810 23101138 SY19 2v 03834810 816 1920 6001 07120 8816 NEN NN m ZION OV x TOHINOS 3430 u3M0d 19 920 6001 09190 SEED svig 3430 089 t SY18 3430 31038 OV 74 C 4974 920 600 07120 1614 1614 SL SdAH 1081N09 SdAH 210 1N3id0 13A30 1 6 Development K 10 65 Development 0 708 06 27 626 3189 FOIL lt M 66 091938 034013 30 526 9 21 4 034018 30 826 39811 34013130 SS vere 021938 EP um VEL 20 181 ET SP VEL G JVI 1N3IVT VELO YINOL 2 18 035434510 90 0 0 4 TA TA _ VEL 6 9 3430 O svia 3430 gt 1103 20 88 Eg 1918 peed 7 NO zesr HOLNO 330 9114 318000 sc 610 600 08690 V61d 0 4 2 2 0 4 V61d Md NOW 2102 8616 Phaser 7750 Printer Service Manual 10 66 New Toner Cartridge Detection 9068 0877 aun remain 2 uado si 34 uet 191
6. 11 22 Finisher Control Board Bracket and Shield 11 23 Stacker Motor Assembly 11 25 Paddle 5 11 26 Paper Transport Motor Motor Assembly Main 11 27 Cam Bracket Assembly 11 28 Staple Unit Assembly and 11 29 Compiler Tray 11 30 Finisher Wiring Diagrams 11 31 Finisher Service Parts 11 42 PL 17 1 11 42 PL 17 2 Gate Assembly 11 44 PL 17 3 Horizontal Transport Assembly 1 of2 11 45 PL 17 4 Horizontal Transport Assembly 2 0f2 11 46 Phaser 7750 Printer 17 5 5 11 48 PL 17 6 Top Cover and Eject 11 50 PL 17 7 Paper Transport 1072 11 52 PL 17 8 Paper Transport 2 072 11 54 PL 17 9 Staple Unit Assembly 11 56 PL 17 10 Compiler Tray 11 58 PL 17 11 Stacker Elevator 11 60 PL 17 12 Exit 11 62 PL 17 13 Electrical Components
7. 03401830 016 4 18101 19 A 4 0133 181 Q3NV319 0388345 826 18101 916 A er 4 038 338 1 7 oz 319 131 18 T 126 01 39VINI A 181 01 39VMI 02 6 Image Transfer to Paper 616 06 TWNOIS 035 35 YOSNAS 193133 319 07 618 HA eest gane e 1 GaSN3S 2194 ator Feld 319 YOSNAS 1994133 1002 6001 06690 91114 318000 M 4 sinus J N 10 8018 18 10 yo Jamod Jaye WAN ajqeysnipe 146 510891 pue 5108 102 18 108 HA 048 20198 20 6214 YOSNAS 1993134 319 ANZ 9114 318000 39010 NO HOLOW 128138 419 ONZ 1098138 250 600 06 20 104109 190 6001 08690 154 33019 NO YOLOW 1993133 818 ANZ 048138 690 600 06220 104109 150 600 06600 YILNI 0 HA YILNI 8 1144 mg YILNI 9OAvC 13A 39019 NO YOLOW 19 818 ONZ 690 600 06220 1291402 150 600 06220 TAA ais 102
8. 886 06 aur O LON 4 4 4 18 AVM IL ve 4 A 4 wadvd OH 18 T A NN E x 3Nud 1108 us ADL ve 4 nm Qi Z re LA 4 INYO Z AINN 3L a 94 x OM OIA 4 te woo 20 ris 18 034 3 sw e rad 2016 FINGOW Av D ever 409138 e 100 0333 v 318100 i BA a AUD 9 E 100915 038188 1 03838 2786 087 H 98 405458100 WOSN3S 110 0333 ona Tear Sans woo 90 0334 P AVUL opes 1801 8001 08600 zr jj gt A x TE WW d 0000 8 2 4 1 99114 1 4 6 038438 20 55 035435 wed Wer YOSNIS 9114 98 yosnas ino HOSNAS 110 0334 AVL 100 03346 318000 0334 6 01 00 08600 318100 9ans TAA TAA 8 0 E T 2 2 90167 TWNDIS 035138 41 GASN3S 0884 over 0687 1 02 00 39 HOSNAS DIVI Sm i Bd n 901 800 06690 nanoa Y ad Cp mmu 9md en 318100 TINTON AVHL NOUWLYOdSNVYL 83494 3110011 AVL 678 Phaser 7750 Printer Ser
9. THA 20 2 BA 2 1 NO mi A 38883 570 6001 06820 3533 12 WING 92 6 10 77 Waste Toner Disposal 048 08 7 T3A i 1 Lover 9194 2 0 6 6 H 038835 051135 YINOL TINI 418100 1 038138 YOSNAS 1081 6001 08620 YINOL 1104 YOSNIS 3 011104 HO LIMS 490744 LNI 311108 34 HA rior THA Woo 94 191 T 2 18 7 zesr HOIWLIDY 318000 50 600 08620 reld veld 186 318 616 186 0 0141 315 w 01 f 926 300181 313 He A YINOL 3iSv 326 A FOL ore 18111084 14804810 01 31SVM 62 6 826 Phaser 7750 Printer Service Manual 10 78 Rear Fan Control 106 06 3733 15 9 2881 34907 uv3u 1002 7001 0890
10. Code Definition Code Definition 91 Tray 4 missing printing from 4 116 OHP detected in tray 4 high 92 Tray 3 missing printing from 3 117 Front door open 93 Tray 2 missing printing from 2 118 Left door open 94 Tray 1 missing printing from 1 119 Upper left door open 95 HC trays tray 4 missing 120 Lower left door open 96 HC trays tray 3 missing 121 Lower tray door open 97 HC trays tray 2 missing 122 Lower high capacity tray door open 98 Cyan toner empty 123 Right door open 99 Magenta toner empty 124 Jam at output tray 100 Yellow toner empty 125 Jam at fuser unit 101 Black toner empty 126 Jam at multi purpose tray 102 maging Unit 1 at end of life 127 Jam at tray 1 103 maging Unit 2 at end of life 128 Jam at tray 2 104 Maging Unit at end of life 129 Jam at tray 3 105 maging Unit 4 at end of life 130 Jam at tray 4 106 Accumulator belt is at end of life 131 Jam at duplex 107 Waste toner cartridge is full 132 Jam at tray 4 high capacity trays 108 Belt cleaner assembly is at end 133 Jam at tray 2 high capacity trays of life 109 Transfer roller is at end of life 134 Jam at tray 3 high capacity trays 110 icr in tray but paper 135 Jam at door A 111 detected in tray 2 136 Jam at door B 112 detected in tray 3 137 Jam at door C high capacity trays 113 detected in tray 4 138 Jam at door C low capacity trays 114 OHP detected in tray 2 high 139 HT Exit sensor on jam 115 OHP detected in tray 3 high
11. 9 10 Bun 00 7 195044 28 01 sald 0677 498044 10 NODATOd LIATI LAAT Vd 5 PWBA MCU 55 P J 410 UUUV 85 Uc 6 PWBA MDD 9 0927 1958464 0 4aSDYd 89 01 91 5 3215 1 10 03315 3 112V UNS H3dvd 1704 oH LINA 11X3 0 40 91 UNS 13437 UNS H3dVd ON LOW 401317 0333 1 LINA 830334 2 1 3 INOOW 910 Bun 00 7 195244 68 01 0677 498044 Umen 91 enini re MS YILNI 3409 HY MS YILNI 01 91 1 wera o s Cine o s Cine 0 2 t dai 0400 9 19 1 186 4423 PME T t rece M mu mut 1 55 ITER 2 m 6 reir t t 5 f 5 c AV733 VBMd 55 i cive o 44 1 01 5 Orter TU ETS R 5 EA ZAS YILNI 33 05 LNOYJ T re m e 9343 V8Md 91 4044 reig 91
12. 8 57 9 Service Parts Lists Serial Number 9 2 Using the Parts 5 9 3 Parts List 1 1 Drive 9 4 Part List 1 2 Main Drive Motor Assembly 9 6 Part List 1 3 Steering Motor and 9 7 Part List 2 1 Tray 2 9 8 Part List 2 3 Tray Feeder and Left Lower Cover Assy 9 9 Part List 2 4 Tray 2 9 10 Part List 2 6 Registration 9 11 Part List 2 7 Left Cover Unit 9 12 Part List 2 8 Left Cover Assembly 1 of 2 9 13 Part List 2 9 Left Cover Assembly 20f 2 9 14 Part List 2 10 Exit Transport Assembly 9 15 Part List 2 12 Tray 1 1 2 9 16 Part List 2 13 Tray 1 2 0 72 9 17 Part List 2 14 Tray 1 Feed Assembly 9 18 Part List 3 1 Laser ROS 9 19 Part List 4 1 Xerographic Module 1 012 9 20 Part List 4 2 Xerographic Module 2 of2 9 21 Part List 5 1 Lift 9 22 Part List 5 2 Accumulator Belt Assembly 9 24 Part List 5 6 Accumulator Belt Elevator
13. 808155 ON AVUL 2019 JINI WL 201923 YILNI WL 201905 1 1 1103 20 17 z EA i 1 NO HOLON GY 80 41 00 8001 0254 1 0333 1600 8001 06620 zer Gur 1 Od MOUTOAPENOWOLOW df HIVOTH AL 91 131 0333 318100 700 800 06600 1334 600 800 06820 31000 AVHL 989416 HAdWd 97 Phaser 7750 Printer Service Manual 10 50 Tray 4 Paper Stacking 880 06 8017 5 035138 805155 3 31 p 9 2019 8017 15 03838 YOSNAS TAA AL 20197 99469174 31010001 TA Fog TA 5 8 i 20169 036485 818 woo 20 805435 Y3dYd ON OIA OIA 1 1221 1001 06690 t esussna 887 1100 00 HOSNaS 1 1 ON i 1 20189 1 E 1 1 AWD 1 gt HA 1 2 L A59 1018 20165 036888 2 94 uem 6187 1 i 1 1100 20 YOSNIS 13131 AVL 1811 1101 06600 amd t OW jo 0 1018 T 318100 880 288 2194 0
14. GRY 1 1 1 1 1 I GRY 1 1 1 1 1 1 aee GRY 1 1M 1 1 1 GRY ty 4631 Gry GRY 1 P536 GRY INTERFACE VIO LVPS BOARD lee WASTE CARTRIDGE ms 1 SW GRY 537 4 o gt 9 24V LVPS o GRY LD 2 POWER RELAY 1 3 GRY 5 5 GRY GRY ORN ORN gt gt FRONT COVER SW R H COVER INTLK SW LH COVER INTLK SW 87700 432 The 24 VDC Interlock Circuit The 24 VDC interlock circuit runs from the 24 VDC LVPS to the L H door interlock switch the R H door interlock switch and the front door interlock switch back to the engine control interface board then into the engine control board Opening this circuit prevents the laser unit and the high voltage power supplies from operating 1 Check to see if the front door is getting 5 VDC 2 With all doors closed and printer power on check for 24 VDC between P531 1 of the engine control board and frame ground 3 If 24 VDC is not present see See Troubleshooting the 24 VDC LVPS on page 13 to verify the 24 VDC LVPS is working 4 If 24 VDC is present then check the LH cover interlock switch the RH cover interlock switch and the front cover interlock switch General Troubleshooting 4 19 The 5 VDC Interlock Circuit The 5 VDC interlock circuit runs from the 5 VDC LVPS to the L H
15. 9 25 Part List 6 1 Developer Unit 1012 9 26 Part List 6 2 Developer Unit 2012 9 28 Part List 7 1 Fuser Assembly 9 29 Part List 8 1 Air 9 30 Part List 9 1 Electrical Components 1 of 3 9 32 Part List 9 2 Electrical Components 2 of 3 9 34 Part List 9 3 Electrical Components 3 of 3 9 35 Part List 10 1 Front Cover 9 36 Part List 10 2 Top Cover and Front Panel 9 37 Part List 10 3 Rear 9 38 Part List 11 1 Inverter 9 39 Part List 12 1 Duplex Unit 9 40 Part List 13 1 Image Processor and Engine Control Boards 9 41 Part List 16 1 Lower Trays 3 4 5 Assembly 9 42 Part List 16 5 Lower Trays Paper Feeder 1 of 2 9 43 Part List 16 6 Lower Trays Paper Feeder 2 012 9 44 xvii Part List 16 13 Left Cover Assembly LTD 9 45 Part List 16 14 Tray 4 5 Lift Gear Assembly 9 46 Part List 16 15 Electrical Components and Caster 9 47 Part List 16 16 Lower Tray 9 48 Hardware KIIS 9 49 10 Wiring Diagrams Plug Jack Locations 10 2 Plug J
16. 908 100 06690 ME 1 Au9 1 1 1 gt 1 4 EP EP OH 1 1 AND 1 uo ryt seis ae HOLIMS Er o Md yOOTHIINI 1 i wogod 3901140 vty 3ISVM 98 y SES 035019 X901831NI 390181 890 QAC woo 001 10 18 0 0 1 LES 038010 6997 AN V owani 2 YOOTHSINI 11084 ou 1006 1001 06600 us young 1201 1809 HY 1809 JUOL 909 H1 201291 sesr 901423 038010 30018311 83109 H1 10 100 06690 Md NOW 8 1 ONIHILIMS MIOTHALNI 830104771 10 37 Tray Module Power Interlock Switching 892 080 et 141918 035135 M 1887 201103 038010 500183 HOLIMS 72018111 5 13100 TINTON 1106 1001 06600 TINTON 1981 UNI WL 01003 89188114 8114 311001 ONIHOLIMS 001831 83 04 111001 97 81910 8114 HOLIMS X90 T831NI 83 09 13110011 10018311 01 20110 Phaser 7750 Printer Service Manual 10 38 Main Motor Drive Control 692 06 uo 800 700 066 20 paads ejqnop pue uo 100 00 0899 pajqesip 1 99190 194 1010 UIEN 0 YUM paads ye uo 00 7001 06690 1200 59186101 1010 UIEN 2 pajjoJjuoo si pa
17. TINIIS 114 001665 2907 8411 5014 002 7001 08690 318000 NOW 9aAs 318vN3 20195 318VN3 Avet OA Ave B Fi 133 318 3 1134 318813 5411 9 188 anes 1 318vN3 1 318 3 9 YO 109 81 90 95 1 50015 9 49916 0100 Jaye WAN U 9jqeisnfpe 9856 paads mo pue UQ 10108 0119101 paads ufiu SEIS Ue 54 1 Aqpueys uo 8099 pue uo paads Mo 514 15 ueJ 54 1 2 995 8Md NIN 10 sued pue Md 55310 Hed 0 40 11 S 58 JO 1918 0 pariddns 90 Ag UO SuleWal SdAT 99315 20 pue 90 AG jo 0 0015 319803 PUL SdAT 911 HO OPON 499 5 D ALON 8411 1109 20 woo 20 wie T oant 9anyz woo 20 o 614 bled viz 09398 oorr Old HOIH 8411 319109 990 700 06690 eld NIW OaNe e 5 318VN3 Ag NOW 5 318VN3 A NOW V61d 3 1
18. 5 Ensure that the lift frame assembly is fully lifted and the main lever is in the down position Partially remove the main drive assembly Remove the accumulator belt assembly Remove the imaging units and protect from the light Remove the LH cover assembly Remove the transport registration assembly Remove the mark on belt MOB sensor assembly Reach inside the LH cover cavity and remove the black imaging unit rail see Imaging Unit Rail Assembly on page 8 24 Caution Cover the black developer with multiple sheets of stiff paper or cardboard to prevent damage to the developer roller and to catch e clips and washers loosened in the next step The washers can fall out into the lower metal cavity Lay something underneath to catch the washers and screws Service Parts Disassembly 6 55 9 Remove the e clips washers and bearings from the LH lift jack assembly roller guides 10 Partially remove the left hand side of the main lever assembly 11 Remove the LH lever hinge 12 Remove the 4 screws that hold the LH lift jack bracket and remove the bracket 13 Remove the 4 screws holding the LH lift jack assembly and remove from the printer Note When reinstalling the LH lift jack assembly install the screws as follows upper left upper right then the lower screws Verify that the timing marks on the main lever and the lift jack assembly align 8 56 Phaser 7750 Printer Service M
19. 9 Phaser 7750 Printer Service Manual Part List 2 3 Tray Feeder and Left Lower Cover Assy PL2 3 2 3 14 4 5 12 87750 350 Tray 2 Feeder and Left Lower Cover Assembly PL 2 3 No Part number Qty Part Description and part name 1 116 1160 00 Tray 2 Feeder Assembly FEEDER ASSY 2 116 1181 00 Lower LH Cover Assembly COVER ASSY LH LOW 16 116 1757 00 Lower Chute Service Parts Lists Part List 2 4 Tray 2 Feeder PL2 4 NS 94 9 57750 351 Tray 2 Feeder PL 2 4 No Part number Qty Part Description and part name 1 116 1109 00 Motor Assembly MOTOR ASSY 16 116 1211 00 Roller Kit 9 10 Phaser 7750 Printer Service Manual Part List 2 6 Registration Transport Registration Transport PL 2 6 57750 353 Part number Qty Part Description and part name 116 1758 00 Registration Transport Assembly TRNSPORT ASSY REGI Service Parts Lists 9 11 Part List 2 7 Left Cover Unit PL2 7 5 6 7 9 Left Cover Unit PL 2 7 87750 354 Part number Qty Part Description and part name 1 116 1540 00 11 23T Tooth Damper Gear GEAR DAMPER 11T 23T 3 116 1541 00 Left Hand Damper Gear White DAMPER LH 5 116 1182 00 Left Hand Cover Assembly COVER ASSY L H OPB 9 12 Phaser
20. n Tow 626 31SVM 9193 No9I938 56 4 9 20 aou 20 Hold 20 A svig 3430 ANALY 56 026 NO091934 1800 6001 0100 2 1721 S gt 920 600 07190 A ae atr m 310N3u MOTHA 17 21 DE 03834810 2310 OV 03834810 sre WA 5019 3430 TN 1920 6001 0190 gg A 3430 0857 19 3A30 1310 38 OV WA anao 6 4474 1920 6001 0120 1614 SL SdAH 1081102 SdAH NN A 14401830 0176 Phaser 7750 Printer Service Manual 10 64 06 06 enutA 9091 pue Assy anaq 5 1910 pasues 10suag 21v Aq 14 18101 pue 1900 51981901 s dnjag 10895 21V 12600 10 105095 9 Jo uo payloads 20 6 pue anjeA asn 105095 217 10 Assy uauM m8 vu 1 1 NO 1 033 E YAMOd YOSNAS 91V Wi 4 080 600 06600 118 T 9jedo 0 10010 pue sJojojy
21. 111 T 1 woo 20 1 ms T go TWNDIS 10 _ 208 T 7 03395 3001 43914 NYJ 33514 002 700 08620 NOW 318000 u3snd 1050 7001 08620 NOW 9814 2701 Phaser 7750 Printer Service Manual 10 80 Inverter 606 05 mos f NEN 1109 8 01 8 01 1109 20 0 na ar 9d HOLN19 3Su3A3d U31U3ANI 9aAvz 1 NO 3SU3AIY 183 swoor 1290 8001 0594 na 2 T ns 2 QuvMu03 W319U3ANI 318000 eeor 5594 0123 02 318000 9 20 2 1 NO HOLATO Y3LYJANI swoor 1290 8001 06620 209 13 2 30 1 u3183ANI VE OL 10 81 Inverter cont d 705 065 xejdng 10 yed ay 01 dn 0 Jaded 90 ayy aur
22. 5 piousjog UQ 908 E 3310N AUS 5 19 2 1 1 1 1 i Woo 2 1 oig 2 0 TBA 77 vor 10250 ZES zesr 1 1194 119 1172 0114 HOSN3S ama 90 To 038138 YOSNIS Sm 9 941 1104 318000 XOVIS 1104 8Md 31 318000 1001 0101 06690 ma N ma d yg oz 18 IN 21 81 Love 8199 19 geor 9 201 21 HOLOSNNOO o ma 11X3 dn 3994 441 4 3 gg Sy 36 14 Jey rel 1601 0101 06620 ananga 2017 9 6184 00300 8Md NOW 30838 YOLOSNNOO 91114 8Md 11X3 dn 39v4 318000 now 4 4 4 9 OL 1409 03574 SOL 909 Q31U3ANI 1108 11X3 u3Snd AN 7109 VOL 1X3 30v4 NMOG 3993 01 09 7109 1X3 90Avc F W09 1 90Avc nig 1 p 2 No d ane 3149 318000 i ms 10
23. OHP Sensor Left OHP is L L Paper or OHP present Right OHP is L H Paper or OHP not present Duplex Sensor Duplex is L H Paper present L Paper not present Tray Feed Sensors Feed Out 1 is L Take Away F O 2 is L Feed Out 3 is L Feed Out 4 is L Feed Out 5 is L H Paper present L Paper not present Stack Full Sensor Stack Full is H H Output Stack not full L Output Stack full Fuser Exit Sensor Fuser Exit is L H Paper present L Paper not present 1st BTR Retract Sensor 1st BTR Retract is L H In contact L Retracted 2nd BTR Retract Sensor 2nd BTR Retract is H H In contact L Retracted Fuser Present Fuser is Present Change soon Change Need to cycle power to get the results to change when installing a new fuser Read Fuser Fuses Fuse 1 is Shorted Fuse 2 is Shorted Fuse 3 is Shorted New Fuser 100 page fuse 50 Life 99 Life Open indicates Fuse is blown Accum MOB Sensor MOB sensor is L H belt home mark is sensed L belt home mark not sensed Belt Edge Sensor Edge is nnn current value OK or Failed 4 6 Phaser 7750 Printer Service Manual Test Front Panel Display Test Operation Definition BTR Sensors BTR 185 BTRCisL BTRKisL ist is L 2nd is L H Error L No error ADC Sensor ADC is XXX ADC Automatic Density Corr
24. 811 si mau e ay ponad Ajuo 10 0 1691 at 926015 10802 Aq MOT 5129190 0 ma o TWNOIS HOLIMS 1 0 0 56 19313 MIN 204 Sone MA 0 193130 390 2 rd 101 6001 0580 HOLIMS 193130 9011899 ma Te 5 5 HOLIMS 7 193130 MIN 05 193130 3901139 MIN 0 HOLIMS 0 193130 9 1 MIN 1914 601 600 05809 0 HOLIMS 193130 90101 NN 18 222 W WNOIS HOLIMS 1 193130 MIN 05 103130 39018180 MAN W HOLIMS 0 90A 193130 390118 MIN 91 1201 6001 08 20 W HOLIMS 193130 90 2 TA TAS T 5 ATWNOIS HOLIMS 90 1 193130 MIN A 50 0156 193130 3901418 0 MAN A HOLIMS 0 9gAee NAW 19313 3901818 9 MIN 101 600 06690 4 HOLIMS 193130 90115 9 Feld now 01194130 39013139 YINOL MAN 176 10 67 Toner Dispense Control 90 09 si Aidur3 1910 1900 07 10 ay Jaye 2905 9091 1101 UIAYM SI 19001 dads Assy aAaq 9202 1910
25. ALON Ud 034 ISIN re A A A Ad09 100 3100 sol nosa 87 oaAre HA NYO BA i i TA leer 0097 0294 2 1 NO 10 z H91 119 1938 9214 91114 HOLT 1838 318000 80009 460 800 08820 gma non 1 90199 1 04838 309133 WNOIS 035 35 905135 1011 8001 08690 5 YOSNAS 1939 Feld NOW 5 035135 TA 2 TA Ar C7 i 30838 1935 20 88 1 35438 0094 0297 6017 YOSNAS 1935 OIA 91114 gi g 6017 0291 1 1 0699 0390 2077 90114 8 14 NOW 318000 151934 8 8 Phaser 7750 Printer Service Manual 10 58 Drum Drive Control 162 0842 A Wnua 56 WNOIS 1114 6 WA Y0L0W WG 0 ma sear 9ane e 1114 5 atid O WA 01 00 06690 Feld NOW 8 441 eur emn v 04002 51 09908 au aug p pey 110 700 00690 pue paeds 91620 0 51010 94 SMO 600 700 00890 uo sepejq uini
26. Acoustic Noise Idle 29 dB A Printing 52 53 dB A Media and Tray Specifications For information on approved Phaser 7750 media and paper types print the Paper Tips Page from the printer s front panel General Information 1 13 Phaser 7750 Printer Service Manual Theory of Operation In this chapter Summary of the Phaser 7750 Print Process Paper Path of the Printer EAHG Toner Technology Overview ROS and Regicon Technology Overview RegiCon Overview Sensors Chapter Summary of the Phaser 7750 Print Process The Phaser 7750 Color Laser Printer is a full color laser printer that utilizes electrophotographic recording principles to place a full color image onto the print media The system contains a drum and developing unit for each color yellow magenta cyan and black YMCK and places the toner image of each color onto print media via an intermediate transfer belt producing full color prints A summary description of the printing process is presented in the following steps 1 Charging The imaging unit charge roller is negatively charged by the High Voltage Power Supply HVPS and is kept in contact with the drum surface to provide a uniform negative charge on the drum as it rotates at a constant speed This occurs simultaneously for YMCK 2 Exposure The laser unit emits laser beams modulated by image data from the Image Processor board The laser beams are directed onto the drum sur
27. V61d 8Md NOW 8Md 4 Ho 102 SI 95 290 uomejo1 sdojs uey 0995 ul HO WAN 9j qejsnfpe 2980 010101 paads mo 0 pue UQ 1010 Je 10112101 paads uiu SeS ue Jeay Kqpuejs uo ui 3 0995 pue uo Jamod 0012101 paads Mo 81118 ue 0 9anvz 3348 H9IH uv3H 090 700 0590 00 07 4 8Md NOW 108110 13 08 6 10 79 Fusing 2 5310 403 035 03441818 1v3H 9 504 93503 08 09 51 20 0 951294 Dunejo1 50015 uey ay dea s ul HO 20301 Jaye WAN U ajqeisnipe 2956 paads moj 0 sysue pue UQ 1010 16 paads ufiu suejs ue Aqpue s uo 1 509 pue uo Jamod uonejoJ paads o sues ue 0 D 89 8 8 2 1 ON g go 198 036436 4 0353 2194 jEr 2197 HOLIMS HOLIMS 3505 om 9m 9m 11X3 Y3SN4 101 010 06690 318100 318100 HOLIMS 418000 318000 61 xa wasn NOW woo 20 Ad09 G3SN4 woo 20 uly 19 ms n TY
28. of the print Grid 1 Dot pattern annotations on page 16 With TOP up note the Phaser 7750 Printer Service Manual direction of scan from left to right as the FAST direction The direction from the bottom of the print to the top is referred to as the SLOW direction Up Top Leading edge into output tray Left Fast Right 5 Down 57700 465 4 Notice which vertical line color s the print needs be moved right left to line up as closely as possible with the cyan color line e Measure how much each line needs to move in millimeters and whether it must be moved left or right Note Cyan is the reference color and does not move Make the adjustments of M Y and K toward Cyan 5 From the Adjustment Calibrations menu select Coarse RegiCon Init test a This time answer No to the Set Factory Defaults Yes No b Answer Yes to the Do you want to adjust Yes No question C Answer No to Set Skew Error threshold Yes No d Answer Fast to the Which scan direction Fast Slow 6 Select which color of YMK to adjust Select how many millimeters 1 5 to adjust Select which direction Left Right The next screen asks for confirmation Adjust color by n mm Yes No select Yes 7 Reprint the Grid 1 Dot pattern to verify changes 8 Print the Grid 1 Dot page to see if the vertical lines are all clustered within 1 mm of the Cyan line If n
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31. 3 3 LVPS 7750 010 8 44 Phaser 7750 Printer Service Manual LD Power Relay 1 Remove the rear cover and shield 2 Disconnect the wiring harness 3 Remove 2 screws securing the LD power assembly 4 Remove the LD power assembly 7750 232 Service Parts Disassembly 8 45 24 VDC Low Voltage Power Supply Fan and Bracket 1 Remove the rear cover and 24 VDC shield 2 Remove the top rear cover and left hand rear mid covers see page 8 7 Note If only the power supply needs to be removed disconnect the wiring harness and loosen the 2 screws that secure the power supply to the PS mounting bracket 3 Disconnect the wiring harness at P502 P505 and P2 from the 24 VDC power supply and the fan motor wiring harness P214 4 Remove the 1 screw at the top of the bracket and loosen the remaining four screws in slots 5 Remove the power supply and bracket assembly 7750 024 8 46 Phaser 7750 Printer Service Manual T2 High Voltage Power Supply Remove the 24 VDC Power Supply and Bracket see page 8 46 Disconnect the high voltage wires from the KCMY connectors Disconnect the wiring harness from J575 and J576 Remove the 2 screws that secure the T2 power supply to the printer frame a Aa Q N Remove the T2 high voltage power supply X LO eel m
32. 5 Remove the internal hard drive and reboot the printer see page 8 39 If the splash screen now appears replace the hard drive 6 Replace the image processor board see page 8 38 LVPS Fuser and ROS Fans On Front Panel LED is Red No Front Panel Message 1 Observe the blinking pattern on health LED see chart on page 3 9 and troubleshoot the indicated problem Replace the front panel see page 8 5 Replace the front panel cable see page 8 5 Replace the internal hard drive see page 8 39 a N Replace the image processor board see page 8 38 Front Panel Continually Displays Xerox Phaser 7750 Splash Screen 1 Enter service diagnostics mode and watch the front panel during the initializing period for messages indicating any printer faults View the fault list for indications of any printer faults Replace the image processor board Replace the hard drive Replace the card cage assembly ou kr WO Replace the engine control board 4 14 Phaser 7750 Printer Service Manual Front Panel Displays Fatal Fault Encountered Message See the procedure for Controller to Engine Communications Failure Code 81 on page 3 39 Inoperable Printer Troubleshooting False LH Door RH Door Front Door Open or Imaging Units Missing Messages See the Troubleshooting Power Supplies and Interlocks on page 4 16 For all of the Following Problems go to the Error Code Procedure Tray
33. 11 64 PL 17 14 Finisher Rack 11 66 A Appendix A 2 Service Diagnostic Menu A 4 Service Usage Profile Status A 5 Missing Chain Link Codes A 11 Paper Weight Equivalence Table A 12 Index Service Manual xix Phaser 7750 Printer General Information In this chapter Phaser 7750 Printer Configurations Parts of the Printer Phaser 7750 Front Panel Configuration Image Processor Board and Rear Panel Host Interface Routine Maintenance Items and Consumables Printer Specifications Chapter Printer Introduction and Overview The Xerox Phaser 7750 Color Laser Printer Service Manual is the primary document used for repairing maintaining and troubleshooting the printer To ensure understanding of this product complete the Xerox Phaser 7750 Printer Multi Media Service Training and Self Study Guide 7750 234 1 2 Phaser 7750 Printer Service Manual Phaser 7750 Printer Configurations A replaceable Configuration Chip holds configuration information that enables or disables built in features as described below Printer Configurations Features 7750B 7750DN 7750GX
34. 54500 345 9 4 Phaser 7750 Printer Service Manual Drive Unit PL 1 1 No Part number Qty Part Description and part name 1 116 1752 00 Drum Drive Assembly DRIVE ASSY DRUM 4 116 1753 00 Accumulator Belt Drive DRIVE ASSY IBT 7 116 1754 00 Developer Drive Assembly DRIVE ASSY DEVE 14 116 1755 00 Main Drive Assembly DRIVE ASSY MAIN 15 116 1756 00 Developer Gear Assembly GEAR ASSY DEVE Service Parts Lists 9 5 Part List 1 2 Main Drive Motor Assembly PL1 2 31 1 2Pcs 87750 346 Main Drive Motor Assembly PL 1 2 No Part number Qty Part Description and part name 13 116 1539 00 Developer Clutch Assembly CLUTCH ASSY DEVE 9 6 Phaser 7750 Printer Service Manual Part List 1 3 Steering Motor and MOB PL1 3 1 2 3 4 5 15 57750 347 Steering Motor and Mark On Belt PL 1 3 No Part number Qty Part Description and part name 1 116 1104 00 Belt Steering Drive Assembly DRIVE ASSY STEERING 4 116 1124 00 Mark On Belt Sensor Assembly SENSOR ASSY MOB Service Parts Lists Part List 2 1 Tray 2 PL2 1 21 2P es 0 4 PL2 2 87750 348 Tray 2 PL 2 1 No Part number Qty Part Description and part name 1 116 1093 00 Tray Stopper STOPPER TRAY 2 Spacer N S 3 116 1126 00 Paper Supply Switch Assembly SWITCH ASSY P S 4 119 6504 00 Tray 2 Universal Tray
35. 7750 135 8 14 Phaser 7750 Printer Service Manual Registration Transport Assembly Note Do not remove the 2 inside screws 1 Remove Left Hand Door A see page 8 11 2 Remove the 2 screws from the plastic flanges that secure the transport assembly in the printer frame Note Note the wiring harness position for reinstalling and make certain the wires are routed behind the black plastic cover on the Registration Transport Assembly 3 Disconnect the wiring harness 4 Remove the registration transport assembly 7750 473 Service Parts Disassembly 8 15 Shutter Solenoid Assembly Remove Tray 1 MPT see page 8 9 Remove the registration transport assembly see page 8 15 For easier access you can remove the duplex chute see page 8 13 A N Disconnect the wiring harness from the front frame connector Note Note the locating pin position then loosen the one screw that secures the assembly to the frame and remove the shutter motor assembly 7750 021 Replacement Procedures Caution Verify that the lever is correctly positioned in the slot on reassembly 1 Remove the Waste Cartridge 2 Remove the Black Imaging Unit 3 While reinstalling the shutter motor assembly with a flashlight verify that the solenoid lever engages the notch in the shutter plate 4 Tighten the mounting screw and reconnect the wiring harness 8 16 Phaser 7750 Printer Service Manual Tray 1 Fe
36. Disconnect 3 wiring harnesses Remove the retaining clip off the link mounting post o OO FWD While supporting the door remove the link Lower the door to approximately 75 90 and lift off the pivot pins to remove RETAINING CLIP 75 90 DEGREES 7750 014 COVER Service Parts Disassembly 8 11 Replacement Procedure Note Reinstall the door on the hinge pins and manually align the marks on the motion damper before completing the installation Failure to align the gears can result in binding and gear damage WHEN REASSEMBLING ALIGN THE MARKS ON THE FRICTION DAMPER Marks on Motion Damper Stop Pin 7750 016 8 12 Phaser 7750 Printer Service Manual Duplex Chute 1 Remove Tray 1 see page 8 9 2 Open the Left Hand Door A 3 Rotate the duplex chute downward until the keyed pivot shaft can be removed from the pivot bracket 4 Remove the duplex chute Note The duplex chute must be in the up position to install Tray 1 Open Door A position the chute in the proper position and then close the door 7750 231 Service Parts Disassembly 8 13 Inverter Transport Assembly 1 Open the Left Hand Cover Assembly Left Door 2 Remove the e clip and remove the roller assembly 3 Remove 2 screws securing the inverter transport assembly to the Left Hand Door and remove the inverter transport assembly
37. on Oo Click the Configuration tab A list of installed network components appears for the following items Client for Microsoft networks W Xerox TCP IP Port Monitor If you are running CentreWare DP verify the following W Novell Networks You are required to load Novell IntraNetWare Client or Microsoft Client for IPX networks TCP IP Networks No additional software is required but your printer must have a valid TCP IP address assigned If any of the above protocols or services are not installed install the necessary components and restart the system When the system is restarted return to this document Click Start click Settings then click Printers The Printers window appears Right click the printer icon then click Properties Select the Details tab Verify the following a The printer driver name in the Print Using the Following Driver list If necessary re select or install a new printer driver b The Port name in the Print to the Following Port list If necessary re select the correct name Send a print job to the printer If the printer does not print access PhaserSsMART Technical Support from the Troubleshooting tab of the Windows printer driver or go to www xerox com office support 4 26 Phaser 7750 Printer Service Manual Macintosh Troubleshooting Mac OS 9 x Mac OS X Versions 10 1 and 10 2 The following procedure eliminates cabling communication and connecti
38. 2 patches per color are printed and ADC control is initiated at Power on return from ENERGY STAR after interlock close End of each job m Within a job every 80 pages at full speed every 40 pages at half speed During normal operation the ADC sensor reads the density of patches on the accumulator belt to ensure that the machine is providing its best output Based on the readings of these patches the concentration of toner in the developer housings can be changed or laser power adjusted For example if the customer ran a large number of images that contained a high concentration of yellow the yellow developer housing would become somewhat depleted of yellow toner The machine would first notice this depletion as a patch on the accumulator belt that is less dense than the specifications allow and due to the ATC Sensor s indication In this situation the machine would automatically tone up adding more toner to the developer housing The higher concentration of toner in the housing would then allow more toner to be developed out to the accumulator belt and the patches would then start to become more dense In this way the system corrects itself when density becomes too low ADC Output Check The ADC Sensor Assembly consists of 3 sensors that read values off the CMYK test patches The regular reflection diffusion and offset sensors provide readings to the printer logic to determine if density is correct ADC Ou
39. 3 Pull the top edge of the rear cover assembly about one inch away from the printer and push down to release the cover Left Hand Rear Mid Cover Cover Top NI Rear PS Rear Cover E SN 7750 160 8 6 Phaser 7750 Printer Service Manual Top Rear Cover Remove the rear cover see page 8 6 Open the Left Hand Door A Loosen 1 screw from the top rear cover A N a There is a hidden captive tab on the front and side of this cover that resists the upward pull Place your finger on the front side of the cover to release the tab and pull towards you Cover Left Hand Rear Mid 1 Remove the rear cover 2 Remove 1 screw from the Left Hand Rear Mid Cover 3 Open the Left Hand Door 4 Lift the cover up to release captive hooks then toward you out of the printer Service Parts Disassembly 8 7 Left Hand Lower Cover Assembly 1 Open the Left Hand Lower Cover 2 Disconnect the wiring harness and free from the clamp near the rear pivot Note Note the positioning of the wiring harness for reinstallation 3 With a flat tip screwdriver pry out the pivot pin then pry out the pivot pin expansion sleeve 4 Remove the Left Hand Lower Cover Cy 7750 126 8 8 Phaser 7750 Printer Service Manual Tray 1 Multi Purpose Tray MPT 1 Remove the Rear and Mid Covers see page 8 6 2 Open the Left Hand Cover Note Note the routing of
40. 3 Remove the 2 screws securing the Gate In Solenoid Assembly and remove 11 16 Phaser 7750 Printer Service Manual Finisher Covers Left Top Cover Rear Cover Front Cover Left Cover 57700 396 1 Remove Horizontal Transport Assembly see page 11 11 2 Remove 1 screw from the Left Panel and remove 3 Remove 5 screws from the Rear Cover 4 Clear the gear at the top of the Rear Cover and remove the cover 11 17 Open the front door Remove 4 screws securing the front cover and remove Remove 2 screws from the left cover and lift up and out to remove Loosen the 4 screws securing the top cover Remove the left portion of the top cover assembly Open the top door and remove the front and back screws O o 1 11 Pop off both straps tilt the cover and remove Note When installing the rear cover be sure that the two cables exiting the rear cover are properly aligned around the plastic tab in the exit way If not the cables fall to the bottom of the exit way and the cable to the horizontal transport cannot reach the cable connector on the transport 11 18 Phaser 7750 Printer Service Manual Stack Height Sensor Assembly Sensor Flag 57700 328 Remove the horizontal transport assembly see page 11 11 Remove the top cover see page 11 17 Remove 1 screw from the Stack Height Sensor bracket A N a Press down on t
41. Cor 8 Gr wiy tor nuc HO WLL VBMd 2 2 310000 910 Bun 00 7 195044 0 425944 06 01 2 0 2 aer joer 130 nol tT ST ERT oro 1019 n rnc tory p m 4944 884 017118 0 4994 1 11 24 11148 924 46 64 480 401 54 197923 2249 5411 80151538 838114 2 9 Jo 9 0927 1958464 Phaser 50 Finisher In this chapter m Phaser 7750 Finisher Finisher Specifications Finisher Assemblies Finisher Disassembly Finisher Service Parts List Chapter 11 Phaser 7750 Finisher Finisher Overview The finisher is a customer installed option that contains a horizontal transport stapler compiler and stacker The finisher docks with the print engine and finisher stand The finisher s built in power supply takes 24 VDC from the printer and provides all the DC voltages required 57700 444 11 2 Phaser 7750 Prin
42. aSNadSIC ss 100 600 0609 HER NIN 1081 03 3SN3dSlQ YINOL 81 6 Phaser 7750 Printer Service Manual 10 68 ADC and Environment Sensing 208 022 ALIGINNH 1 1 AA 5 8054535 8r ALIGN 05836 1 27 5f 12 NSWNOMIANA 1 1 i 18 ig WA 135 600 08100 UNDIS 01 9 gest _ WSIS 619d 3156 uosNas dWWAL HOSN3S ETE 1N3ANOHIAN3 bend 1N3ANOHIAN3 End 47 0 1962 6001 09190 now 8 4 ena 51 avens 105095 JAY 5980 0 8900 105096 JAY se uoos sy Risuep 20109 Duisues uo 811 10 81 uorum 031 Rysuep uo sun yed 1401 4 9908 10 81 Z 037 10 09 pu 30 5 9 9 esues alue sexe odo asoym syed 3ufi paj28 j8J sasn Josuas JAY 9 9 LON 1 MA ge 1 1 1 woo 1 1 1 Tm BA 6197 6199 LNaWNOBIANA 9014 318000 4 508835 AN3IANOHIAN3 18101 X 20 526 autas 7 18101 9 21 420 226 01388345 18101 WW 1
43. 0 4 9QAS 61 Feld 3 1 NOW 1041109 YALLNHS 809 01 9 Phaser 7750 Printer Service Manual 10 42 Color Registration Control 96 08 HEIS BUM uonea07 AUM 296 MO S q 48945 49019 0 exuejeg Kauenba14 49019 oapi 49019 O3PIA HEIS AUM UPOG 1684 108498 GOW Aq b 1 10109 0 0228 ay 0 540081100 SOY enu ma SALON WNOIS 03123130 2805155 8001 ely 1 03193130 8 2 405455 8001 ma 1 1 03193139 l 2 HOSNAS 80 1 l ma oy HA WNOIS 03193130 YOSNIS 80 1 9 9219 20185 20169 7 03103130 8 1 805185 8001 ge 00198 1 03103430 8094 809 Y L 805435 8001 20165 318100 eld avy 2 805155 8001 18101 00193 Q38u349NvUL 66 18101 21 4 NO091934 Q38u349NvuL 266 18101 21 4 NO091934 Q38u349NvUL 186 ma 5 NO 8 031 Z YOSNAS 80 1 ma 18101 A NOOISSY 026 na HA 1103 90 ma
44. 1 From the Hidden Service menu highlight Run Service Diagnostics and press OK Wait for the printer to initialize in the Service Diagnostics mode 2 Highlight the Adjustments Calibrations menu and press OK 3 From the select Adjustments Calibrations menu select the Coarse RegiCon Init test and press OK a After NVRAM values are read the test asks Set Factory Defaults Yes No then select Yes b This sets the horizontal and vertical alignment to centered values At this time it should not be necessary to reset the magnification or magnification balance values so select No to Set Skew Error Thresholds Yes No Note In all the following steps Cyan is the reference line and cannot be adjusted so you need to adjust all the other lines towards the Cyan line 4 From the Built in Test Prints menu select Print Grid 1 Dot a 6 12 This print shows the relative error between the and scan lines Always indicate which edge of the print comes out of the printer first to be certain which way is Left Right or Up Down see Figure 4 6 Grid 1 Dot pattern orientation for A size paper Measure the distance in millimeters between the vertical lines with the Cyan line being the reference line It is best if the default paper tray contains A size paper Top 87700 464 0 Note the leading edge of the paper when removing the test print from the tray Use a or pencil to note the leading edge as the
45. 19137 YSHSINI4 5 HOLIMS 90 1831NI 8000 11083 peer 9QAve NO 02222227 NO YILNI 1 73A 998r 218 oser HOSNAS X201831NI U3HsINH ONOG TW 0220 HOLIMS 390 3009 1 084 HILIMS 390 1831NI 3409 401 168 HOLIMS 90 3000 11083 90169 1 038019 HOLIMS X90 TH3LLNI 8000 11083 NYO 0 30 F N O 005 21 06600 O AO ar 68 WNOIS HOLIMS 1 OO TINI 83100 401 00085 198 20 69 1 08019 HOLIMS 90183 11 Y3A00 401 108 21 06620 y 8c eb bd 90 1831NI 3909 401 t oosa 068 reid and dA SIHILIMS 390 1H31NI ANY H3MOd H3HSINIJ 121 11 31 Board Communication 806 06 TA 8 i woo 20 1 1 1 TA 3 141988 entep M 1103 20 USHSINd 9 dii BA 1 woo 01 i 5114 118100 BA 0350 LON 1 HA 0 1 193130 UHSINI 1 1 ST TWNOIS 1 1 NO HOLM 1939 1 1001 21 08690 1 THA 20 65
46. 3 60 Finisher Communication Failure Code 124 3 61 Finisher Staple Mode Logic Failure Code 125 3 61 4 General Troubleshooting INtrOdUCHION lt Med c a a 4 2 Service 0 051 5 4 2 Service Diagnostic Front Panel Button Descriptions 4 3 Service Diagnostic Tests 4 3 Front Panel 0 5 0 4 14 The Printer Does Not Come to Ready State 4 14 Inoperable Printer 0 4 15 Troubleshooting Power Supplies and 4 16 Troubleshooting AC 4 16 Troubleshooting the Low Voltage Power Supplies 4 17 Troubleshooting the 3 3 VDC and 2 5 VDC Low Voltage Power Supplies 4 18 Troubleshooting the 24 VDC 5 4 18 Interlock Circuit 0 4 19 Media Jams and the Paper Path 4 21 Media Based Problems 4 21 Operating System and Application 5 4 23 Windows 2000 Windows XP Windows Server 2003 Troubleshooting 4 23 Windows NT 4 x Troubleshooting 4 24 Service Manual XV Windows 98 and Windows Me Tro
47. Phaser 7750 Color Laser Printer Service Manual Warning The following servicing instructions are for use by qualified service personnel only To avoid personal injury do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so First Printing December 2003 071 0864 00 Copyright 2004 Xerox Corporation All Rights Reserved Unpublished rights reserved under the copyright laws of the United States Contents of this publication may not be reproduced in any form without permission of Xerox Corporation Copyright protection claimed includes all forms of matters of copyrightable materials and information now allowed by statutory or judicial law or hereinafter granted including without limitation material generated from the software programs which are displayed on the screen such as styles templates icons screen displays looks etc XEROX The Document Company the stylized x CentreWare infoSMART Made For Each Other Phaser PhaserSMART and the TekColor icon are registered trademarks of Xerox Corporation PhaserCal PhaserMatch PhaserPort PhaserTools and the TekColor name are trademarks of Xerox Corporation Adobe Reader Illustrator PageMaker Photoshop PostScript Adobe Garamond Birch Carta Mythos Quake and Tekton are registered trademarks and Adobe J enson Adobe Brilliant Screens te
48. Q 57700 050 Staple Unit Assembly 1 Remove the front cover see page 11 17 2 Remove the 2 connectors to the staple unit 3 Remove 2 screws note one screw has a ground wire 4 Pull the staple unit assembly down tilt up and pull out towards the front Staple Motor 1 Remove the staple unit assembly 2 Remove the right cover 3 Disconnect the wiring harness 4 Remove 2 screws and remove the motor 11 29 Compiler Tray 57700 357 57700 356 57700 359 Remove all covers see page 11 17 Remove the finisher control board shield see page 11 23 Disconnect P848 Remove the set clamp solenoid connector Remove the staple unit see page 11 29 Remove 2 screws from the bottom of the tamper assembly front and rear Push the wiring harness into the printer frame ON Oat Tilt the carriage up and slide straight back letting the carriage drop down in the frame then slide straight out the stapler cavity 11 30 Phaser 7750 Printer Service Manual Finisher Wiring Diagrams DC Power and Interlock Switches 188 08 1 YOSNAS 20 1831NI 9000 34 1991014 0 98 9101 920851591 seu 10151191 ay SMOY 148 101910 HA 5 Q3SN3S 805135 90 TH3INI 000 20488 eb Lid Y3HSINIS 5 oser 20189 1 038019 805135 MOOTHINI 000 20 21 08590
49. The horizontal alignment error is excessive and a manual adjustment is required before the diagnostics test routines for fine skew can pass Perform the Coarse RegiCon Init procedure see Coarse RegiCon Initialization on page 6 12 RegiCon 3 Center Skew Adjustment This test adjusts magnification balance There are no manual adjustments required after completing the test Note To perform this test move the mark on belt sensor to the CENTER position After the test has been run the mark on belt sensor must be moved back to the home position 1 Remove the waste cartridge 2 Remove the screw that holds the mark on belt MOB sensor to the front of the printer 3 Using the laser lens cleaning tool move the sensor all the way to the CENTER position until it hits the stop 4 Reinstall the waste cartridge 5 Close the door and run the test 6 From the Hidden Service menu highlight the RegiCon Setup Cycle menu and press OK 7 The first time any RegiCon test is requested the pages used to perform the test must be created so there is a short delay During this time the front panel displays Processing Data Please Wait 8 Highlight Do 3 Center Skew Setup and press OK The front panel now displays Testing Please Wait Adjustments and Calibrations 6 9 9 Wait until the test results are displayed as follows Center Skew Setup Passed Min A Blocks 24 Max B Blocks 4 Yellow 0 Click CW Magenta 0 Clic
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51. yosnas YOSNIS Ir 809 088 S SONVYINA H3TIdWO9 9114 3911409 101 211 06590 318100 YJHSINI4 4 annaa OLuadvd 79 E NN 1108 LIXA 1108 LIX3 83180230 Tow eet fat 20195 NONI IN iz z 18 0884 088 1 NOHOLNTO 9 8 pina 5m 8318230 HN NN NU avanoa 2 mozi YOSNIS 070 21 06690 wo HOLT 33151939 3919030 Wv9 83181230 H 5 035 35 YOSNAS 3INOH 831819230 1 034078 3033 39141939 12 21 08890 Md 20498 Y3HSINIS NOLWLYOdSNVUYL H3dVd ONY 83181230 821 11 35 Tamping and Offset 558 0614 012114 HOSN3S LNOH eur enuia 7 1091010 5 10 9216151891 VERGE 22 aly TA TWNOIS 035 35 9 8 309438 YOSNIS 7 ad 122 3WOH 11083 ONZE M IWNSIS Q3SN3S YOSNAS H3dVd VERGE 5 Q3SN3S YOSNAS uvas
52. 0615 3 15 Transfer Roller Contact Failure Code 20 Transfer Roller Retract Failure Code 21 3 17 1st BTR Contact Retract 3 18 Accumulator Belt Home Position Took Too Long Code 30 Accumulator Belt Home Position Failure Code 31 3 19 Accumulator Belt Edge Sensor Failure Code 32 Accumulator Belt Drive Logic Failure Code 34 3 22 Unexpected Accumulator Belt Home Sensor Signal Code 33 3 24 Fuser Main Lamp Failure Code 35 3 25 Install or Reseat Fuser 41 3 26 Fuser STS Front Warm Time Failure Code 42 3 27 Fuser 5581 On Time Failure Code 43 3 27 Fuser Sub Lamp Overheat Failure Code 44 3 29 Fuser STS Rear Failure Code 45 3 30 Fuser STS Rear Warm Time Failure Code 46 3 31 Fuser 5582 On Time Failure Code 47 3 31 Fan Failure Code 48 3 33 Imaging Unit Motor Failure Code 60 3 35 Imaging Unit 1 2 3 4 Communications Failure Code 70 71 72 73 osos bete gy 3 36 Black Imaging Unit Motor 3 37 Waste Cartridge Full Detection Sensor Failure Code 78 3 38 Engine Logic Board Failure 80 3 39 Controller to Engine Communications Failure
53. 17 17 2 C365 UN ES Service Parts Disassembly 8 47 Chassis AC Power Assembly Note AC power consists of the AC drive noise filter and GFI assemblies and mounting bracket 1 Remove the T2 high voltage power supply 2 Remove T1 and T3 power supply assembly Disconnect the wiring harnesses P15 and P16 the drive wiring harness 43 and the individual wires at J39 J40 J41 and J47 of the AC drive board Disconnect the AC wires from P15 and P16 on the Noise Filter board Clear the wiring harnesses from their retaining clips Remove the seven screws securing the chassis assembly to the printer frame Remove the complete assembly from the printer frame 7150 237 8 48 Phaser 7750 Printer Service Manual Main Drive Assembly 1 Remove the fuser 2 Remove Tray 1 MPT see page 8 9 3 Remove the T2 high voltage power supply see page 8 47 4 Disconnect the wiring harness Caution There are 5 brass screws that hold the main drive assembly together DO NOT REMOVE these screws 5 Remove the 5 black screws that secure the complete main drive assembly to the printer frame 6 Lift the complete main drive assembly up and out of the printer Do NOT remove these 5 screws 17504121 Replacement Procedures Note When reinstalling rotate the main drive to ensure the gears move freely Remove the Fuser unit
54. 2 Does the stacker tray lower 3 Does the stacker motor turn Diagnose and Go to step 4 repair the mechanical problem Check the stacker motor gear stacker tray and belt track gear 4 Is 24 VDC present at P J 847 12 with the Replace the Replace the Finisher Stacker Motor Down test running in stacker motor finisher control diagnostics board 5 1 Run the Finisher Stacker Motor Up test in Replace the Go to step 6 diagnostics finisher control 2 Does the stacker tray move up board 6 Does the sacker motor turn Diagnose and Go to step 7 repair the mechanical problem Check the stacker motor gear stacker tray and belt track gear Error Messages and Codes 3 53 Troubleshooting Procedure Step Actions and Questions Yes No 7 15 24 VDC present at P J 847 11 with the Replace the Replace the Finisher Stacker Motor Down test running in stacker motor finisher control diagnostics board 3 54 Phaser 7750 Printer Service Manual Finisher Stacker Tray Failure Code 117 The system detected that the Stacker Tray Upper Limit Sensor was turned ON after the Stacker Tray began lifting up Or the Stacker Tray Upper Limit Sensor remained on after the lowering down of the Stacker Tray was completed Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Stacker Motor Finisher Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1
55. 39070 901925 NO HOLOW 181 00 700 06690 YILNI 20 72 39070 20 2 NO HOLOW 181 1200 7001 0599 39070 901923 NO HOLOW 181 1200 7001 099 108109 JAG 181 ZL6 Phaser 7750 Printer Service Manual 10 70 1st BTR Contact Retract Control 606 08 108498 122002 418 15 01 00195 uo um oi 610 000 06600 uo uim 1 ma 1 9 mg 48 aE 100915 sila E 6599 9094 909 0156 35435 H 19v1No9 YOSNIS ode e WOSN3S 9 14 9114 10 veu LOVULIY 181 318100 318000 319 151 802 600106690 bela docto gt OGASHH NO YIMOd 30938 19Vu13H 318 151 710 700 08820 woo 20 7514 05 35 193133 318 151 NI NNI 9OAvC J9010 NO 818 161 E 590 600 0620 1201800 990 600 06600 N8 jon i 30019 IUAV NO 1 818 161 1550 6001 00220 i may 1941109 050 600 06690 018 1 ns 1 190 681 30019 901829 NO HOLOW 818 151 90As 1 194133 550 600 06620 0290 104100 1940 6001 06620 118 ma ma ma 1644 Leer sogr 9094
56. 7 1 Print the Grid 1 Dot test print Complete Follow Go to step 8 2 Do the colors all align correctly the procedure Store Engine NVRAM on page 6 21 8 1 Perform the RegiCon 4 Coarse Perform the skew Perform the Skew Adjustment on page 6 10 correction Coarse RegiCon 2 Do the results indicate the testhas adjustments as Initialization on passed indicated in the page 6 12 then panel data only repeat this step until the test passes then go back to step 3 6 6 Phaser 7750 Printer Service Manual RegiCon 1 Fine Skew Adjustment This process uses sensors to examine the RegiCon image on the belt and report what adjustments need to be made A side effect of this test is that horizontal and vertical alignments are automatically done if the test passed The data output presents the skew screw adjustment values some number of clicks of the screw either CW or CCW direction Values less than 5 or so are noise and should not need to be adjusted 1 2 From the Hidden Service menu highlight the RegiCon Setup Cycle menu and press OK The first time any RegiCon test is requested the pages used to perform the test must be created so there is a short delay During this time the front panel displays Processing Data Please Wait Highlight Do 1 Fine Skew Setup and press OK The front panel now displays Testing Please Wait Wait until the test results are displayed as follows Fine Skew Setup Pas
57. 7750 459 2 28 Phaser 7750 Printer Service Manual Tray 5 Take Away Sensor Paper Size Switch Assembly Tray 3 1 Tray 4 Tray 4 Take Away Sensor Tray 5 LTD j 4 5 Take Away Sensor Paper Size Switch Assembly No Paper Sensor Level Sensor Tray 3 Tray 3 Paper Size Switch Assembly Tray 4 Tray 4 Tray 5 Tray 5 2 5 4 Tray 4 Take Away Sensor Tray 5 Take Away Sensor 7750 462 Theory of Operation 2 29 Left hand cover interlock switch actuator Paper feed sensor actuator tray 4 One way clutch LTD 13 tray 4 tray 5 Paper feed sensor actuator tray 5 Friction clutch Left hand cover tray 3 interlock switch HCF actuator 0 tray 3 i 5 tray 4 Friction clutch Paper size tray 4 switch actuator tray 4 2 30 gt Paper detect sensor actuator tray 3 tray 4 tray 5 Paper detect sensor actuator Paper size tray 3 switch actuator tray 4 fas One way clutch tray 5 DNA Paper detect sensor actuator tray 5 Friction clutch tray 5 7750 463 Phaser 7750 Printer Service Manual Error Messages and Codes In this chapter Introduction Overview for Troubleshooting Error Codes System Startup and POST Error Messages and Codes Index Table Error Messages and Codes Procedures Chapter Introduction This section covers troubleshooting procedures for the Phaser 7750 printer front panel error messages and codes Only jam
58. A 8 Phaser 7750 Printer Service Manual Code Definition Code Definition 190 Size Mismatch Load B4 JIS 212 Fuser Missing 191 Size Mismatch Load B5 JIS 213 Fuser Life Expired fuser at end of life Size Mismatch Load B6 JIS Accumulator Belt Missing 192 214 Transparency Size Mismatch System halt service call required 193 215 Load Letter Transparency Size Mismatch Laser Failure 194 Load A4 216 Label Size Mismatch Load Polygon Motor Failure 195 Letter 217 Label Size Mismatch Load A4 Accumulator home position took too 196 218 long 197 Envelope Size Mismatch Load 219 Accumulator Home Position Failure 10 Comm Envelope Size Mismatch Load Accumulator Edge Sensor Fail 198 9 Half 220 Envelope Size Mismatch Load Drum Motor Fail 199 B4 221 200 Envelope Size Mismatch Load 222 Unexpected Accumulator Home 5 Sensor Fail 201 Envelope Size Mismatch Load 223 Accumulator Drive Logic Fail B6 202 Envelope Size Mismatch Load 224 Imaging Unit 1 Communications C4 Failure Envelope Size Mismatch Load Imaging Unit 2 Communications 203 225 C5 Failure Envelope Size Mismatch Load Imaging Unit 3 Communications 204 226 C6 Failure Envelope Size Mismatch Load Imaging Unit 4 Communications 205 221 DL Failure 206 Output Tray Full 228 Transfer Roller Contact Failure 207 Imaging Unit 1 Missing 229 Transfer Roller Retract Failure 208 Imaging Unit 2 Missing 230 Fuser Main Lamp Failure 209 I
59. Is the actuating lever broken off of the belt cleaner toner gate 9 1 Remove the waste toner cartridge Verify the waste Go to step 10 2 Enter service diagnostics and run the toner cartridge is Agitator Motor test fully seated 3 Does the motor operate correctly Complete 10 1 Check the voltage at J532A16 on the Go to step 12 Go to step 11 harness 2 Is the voltage 24 VDC 11 1 Check the voltage at J43 12 on the Replace the Go to step 13 harness engine control 2 the voltage 24 VDC board 12 1 Check the voltage at J532A17 on Replace the Replace the harness engine control waste toner 2 15 the voltage 24 VDC board agitator motor 13 15 24 VDC present at the low voltage Troubleshoot the See power supply board wiring between Troubleshooting the 24 VDC the Low Voltage LVPS and the Power Supplies Engine Control on page 4 17 Board 14 1 Remove the accumulator belt Diagnose and Since the assembly 2 Enter Service Diagnostics and run the Accum Belt Motor test 3 Does the motor turn repair the mechanical condition binding the accumulator belt assembly accumulator belt drive motor is a servo motor there are no voltage checks This failure can be caused by 1 of 3 components Replace and test in the following order m motor m interface board m engine control board Error Messages and Codes 3 21 Accumulator Belt Edge Sensor Failure Code 32 Accumulator Belt Dr
60. Lift Failure Code 87 on page 3 41 False Load Paper in Tray 2 3 4 5 Message False Tray 2 3 4 5 Missing Message Tray 2 3 4 or 5 will not lift or the printer will not recognize the auxiliary feeder Printer Does Not Recognize the Finisher The finisher is connected to the printer by a complementary pair serial data link The finisher also generates its own 5 VDC from 24 VDC supplied by the printer Troubleshooting Procedure Step Actions and Questions Yes No 1 Check that the finisher is properly docked Go to Step 2 Repair the with and connected to the printer docking problem 2 From the front panel check the Service Reload the driver Go to Step 3 Diagnostics Test Table to see if the finisher is recognized by the printer 3 1 Remove the rear cover and board Go to Step 4 Troubleshoot and cover from the finisher repair missing 24 2 Check for presence of 24 VDC VDC between the finisher board P844 2 and finisher frame ground 4 Turn off power and check the continuity of Replace the Replace the the serial data link circuit by verifying finisher board engine control continuity between P531B 9 through 16 board on the engine control board and P843 1 through 8 on the Finisher Board General Troubleshooting 4 15 Troubleshooting Power Supplies and Interlocks Troubleshooting AC Power Note The GFI Noise Filter and AC Drive Board are all part of the AC Electrical Chassis Ac
61. P ogg m 1 3c 12 WNS NO 8091 1 805455 80 1 C dao yyy 1 i 8308 44 1 He Hz 8 4 6v woo E 1 026 i ma 305 809 8099 VNOISNO V O31 corr 1 YOSNIS OW hid HOSN3S 80 NOW Ar 916 NO V Q31 SOW 1081502 NOILVHISI93H 80102 LL 9 10 43 Tray 2 Paper Size Sensing 110 0544 Is zs 0 YOSNAS 3715 2 pue swayed 440 NO YAMS 9 1290591 Jay 01 000591102 89216 aded sous 9 qe1 IUL 08886 9215 1904 0 39 51591 pauiquioo oj 0228 pasuas 51 9215 1948 word 5 035 35 YOSNAS 3215 AA 88 68 36456 i 0 4 5 3215 16 NOW 8Md J I 2 AAA EIE 153108 Wo 90 1103 20 TA Feld YOSNAS 3715 3344 1 Sur 915138 371 d3dVd LZ Phaser 7750 Printer Service Manual 10 44 Tray 3 Paper Size Sensing aunen 2 pue sujened 440 U31s 0 puodsaJJ09 59215 Jaded s
62. Phaser 7750 Printer applications The image below shows the EA toner particles The small bumps are particles of additives that produce some of the characteristics of the new toner FEB 62 EnT C2eq Fx 8 5 The image below shows some DC12 conventional toner Like the EA toner the small bumps on the outside of the toner particles are additives that are used to provide specific characteristics Theory of Operation 2 9 Technology Overview Standby Power There are two types of standby power in this machine switched AC and switched DC Switched power requires that both the circuit breaker and the printer s main power switch be in the ON position W Switched AC Power This is the control signal whose power off transition is delayed to allow the second bias transfer roller to retract m Switched DC Power Switched AC power from the AC Drive PWB goes to the low voltage power supplies for the printer Whenever switched AC power is provided to the three low voltage power supplies their output DC voltages are activated by a 5 VDC signal Machine Run Control and NVRAM Machine control centers on the following W Engine Control Board W Image Processor Board Machine parameters are held by non volatile memory located in two places Image Processor Engine Image Processor Board Engine Control Board 7750 458 2 10 Phaser 7750 Printer Service Manual Drive Power The Driv
63. Step Actions and Questions Yes No 1 1 Turn OFF power remove the fuser Go to step 2 Replace the fuser assembly and allow it to cool down assembly 2 Measure the resistance between the Fuser connector P600 7 and P600 9 3 Does the resistance measure between 30 K and 190 K Ohms 2 1 Reinstall the fuser assembly Replace the Go to step 3 2 Enter service diagnostics engine control 3 From the Sensor Tests run the Fuser board Temperature test 4 the temperature indicated approximately 165 C d 1 Turn printer power OFF Replace the Repair or replace 2 Check for an open circuit or poor engine control the wiring connection between J641 4 and board harness J641 5 3 Isthe wiring harness OK 3 30 Phaser 7750 Printer Service Manual Fuser STS Rear Warm Time Failure Code 46 Sub heater warm up error The temperature did not reach Ready temperature within the specified time Fuser SSR2 On Time Failure Code 47 The Sub heater remained ON for more than the specified time Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Fuser m Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Turn OFF power remove the fuser Go to step 2 Replace the fuser assembly and allow it to cool down assembly 2 Measure the resistance between the Fuser connector P600 7 and P600 9 3 Doesthe resistance measure between 30 K and 190 K Ohms
64. T 083105 oe M 135 i NOX UNI m s 90NZ 3 NO LN m8 50019 NO G _ worn INOZ 1060 01 060 211 06600 m8 16 Now 19313 X90 10 90965 NO D _ soona 1 1 60 01060 21108690 18 4 30019 901965 NO 1 i 01 060 118 188 3900 201 NO over HOLOW 12373 Md 750 01060 21108690 YOSNAS 40119 138 YOSNAS 3INOH 193 3 135 0314418 19313 13 6721 11 39 Stacker Tray Control 9688 0822 YOSNAS 3349 9715 118 seu 1 01 UIYM UNO 4091019 9888 0 80011189 94 URL 19 0 SI 1291 1901 5 291 21 seu 10 81 AY 5 q0811n9J9A0 ue uauM 0 919191 y uey 1946 41 1401 39019 H 105095 1 9 4981S 2 SILON tA emp NYO 2 H NOG m im ion HOLOW WaNOVIS i 190 211 06620 1 31 333918 688 2QAve an YOLOW YOLOW 318000 1090 211 08620 8379715 O 8 4 138 0319319 138 030313 621 805 35
65. paads 01 1810 211 OIA peads 01 pLO z L 07777777 paads 49 01 1610 211 paeds you 01 1210 211 paads 09 11 10 21 paads 01 1010 211 6 1 20 6 1 1 ver 8 8 sapoo aui 810 1940 au p 0 8310 3 3NOZ NN E EM 114102 4 05 36 3WOH LNOUJ 9aAve 61 NYO 2 1 zi 11124 NO NYO NO 038 310012 941925 NO LNOY4 1960 OL 160 211 02200 49019 NO YOLOW 14033 1960 01 160 21 05599 319019 20 2 NO YOLOW LNOWS 1960 01 160 21 05899 YOLOW vier 9 8228 5 40010 NO 8v8f LNOW4 1960 01 160 21 o 90 LZVld 138440 ONY 9721 Phaser 7750 Printer Service Manual 11 36 itioning Staple Pos 8668 0817 paads 01 80 211 paads 01 280 21 paads 0 180 21 paads ubiu wou o1 080 21 noun
66. veser 198 ser s eid Y3HSINIS WOU WOU3 NO dOL OL Y3dYd 1090 21 06690 0103708 NI 31V9 198 NO USHSINI4 OL 39 1090 21 08899 Sver O NO UNI USHSINI 6721 11 33 Horizontal Transportation 0688 0822 33140939 01 u3dvd va eur enu 1 310N mm m 1108 VHI H 4 YOSNAS 390 1831NI WHL H E woes 30NVELN3 d 2114 HOSNAS 39NVHLN3 VYL H 01 Ea e 0295 4 N 1 1 i 1 98 045 4 G3SNIS veser 4 86587 B pUNS yosnas 808836 3ONVMIN3 VHL H gt cJ eM 39NVUIN3 VHL H 1601 21 08590 9NIHOHS a ONILYOHS bod Id HOSN3S VHL H ain fal HN i mj B 5 035885 20169 83838 veer 8898 ULLAS 8 14 vira YOSNIS YOSN3S VUL H oma CREE 1601 21 08690 319109 ond 11 318000 pog YOSNIS bod 20 90 1831NI
67. 0 VDC 2 1 Measure the voltage between the gray Go to step 4 Go to step 3 wire and frame ground 2 Does the voltage measure 5 VDC 3 1 Remove the rear cover and rear shield Inspect the wiring Replace the 2 Measure the voltage at J407B 17 harness for engine control the engine control board damage and board 3 Does the voltage measure 5 VDC replace if necessary 4 1 Measure the voltage between the Replace the waste Inspect the wiring violet wire and frame ground cartridge full harness for 2 Does the voltage measure 0 VDC sensor damage and replace if necessary 5 1 Remove the rear cover and rear shield Replace the Inspect the wiring 2 Measure the voltage at J407B 16 engine control harness for the engine control board board damage and 3 Alternately interrupt the sensor replace if necessary 4 Does the voltage toggle between 5 and 0 VDC 3 38 Phaser 7750 Printer Service Manual Engine Logic Board Failure Code 80 Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Cycle power to the printer to clear the error 2 Did this clear the error Complete Replace the engine control board or the image processor board Controller to Engine Communications Failure Code 81 Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Cycle power to the printer to clear the error 2 Turn the printer off 3 Remove t
68. 00 1 Pinch Roll Exit 1 1 Pinch Roll Exit 2 12 Pinch Roll Exit 3 13 Upper Exit Chute 14 116 1240 00 1 Compiler Entrance Sensor 15 Plate Spring 16 Bracket 17 Static Eliminator 11 63 PL 17 13 Electrical Components PL17 13 6 87750 416 11 64 Phaser 7750 Printer Service Manual Electrical Components PL 17 13 No Part Number Qty Description 1 Board Cover 2 116 1235 00 1 Finisher Board 3 116 1314 00 1 ROM 4 PWB Bracket 5 116 1824 00 DC Harness 6 116 1825 00 Cable 7 116 1233 00 1 Top Cover Front Door Interlock Switch 8 116 1253 00 1 Docking Interlock Switch 9 Spring Plate 10 Bracket 11 Plate 11 65 PL 17 14 Finisher Rack Stand PL17 14 1 2 10 3 11 3 912 14 p m 4 15 87750 417 11 66 Phaser 7750 Printer Service Manual 7 14 Finisher Rack Stand No Part Number Qty Description 1 116 1315 00 Front Rack 2 1 Front Cover 3 1 Knob Screw 4 Screw 5 Bracket 6 Stop 7 1 Spring Plate 8 1 Rail 9 Foot 10 Front Rack 11 116 1316 00 Rear Rack Assembly 12 Rear Cover 13 Rear Rack 14 Bracket 15 Bottom Plate 11 67 11 68 Phaser 7750 Printer Service Manual Appendix Contents Menu Map Service Diagnostic Menu Map Service Usage Profile Status Code Definitions Table Chain Link Co
69. 00 1 Pully part of a kit 3 116 1847 00 1 Gear 152 part of a kit 4 116 1271 00 1 5 116 1847 00 1 Gear 302 part of a kit 6 Collar 7 116 1847 00 1 Gear Pully part of a kit 8 Eject Motor 9 116 1847 00 1 Cam Gear part of a kit 10 116 1847 00 1 Gear 427 272 part of a kit 11 Set Clamp Solenoid 12 Bracket 13 Wire Harness 14 116 1234 00 1 Home Sensor 15 Plate 16 17 18 Bracket 19 Stop 20 Spring 11 55 PL 17 9 Staple Unit Assembly PL17 9 1 2 6 10 11 12 87750 412 11 56 Phaser 7750 Printer Service Manual Staple Unit Assembly PL 17 9 No Part Number Qty Description 116 1255 00 1 Carriage Assembly Item 2 6 Bracket Assembly 116 1256 00 1 Staple Move Motor Gear Staple Sensor Roll 116 1259 00 1 Staple Front Corner Sensor Plate o N 116 1254 00 1 Rail REP 17 9 1 116 1257 00 1 Stapler Assembly Item 11 12 REP 17 9 2 Stapler Cartridge Bracket Stapler Harness 11 57 PL 17 10 Compiler Tray Assembly Phaser 7750 Printer Service Manual 11 58 Compiler Tray Assembly PL 17 10 No Part Number Qty Description 1 116 1251 00 1 Compiler Tray Assembly Item 2 15 2 116 1252 00 1 Front Rear Tamper Motor Assembly 3 Plate 4 116 1253 00 1 Front Rear T
70. 07 292 07 397 88 Lower Tray Communication Failure 7 250 pg 3 44 MPT Size Sensor Broken 7 274 pg 3 43 The following Error Codes and Messages are associated with the optional Finisher 111 Finisher Stapler Move Sensor On Failure 12 241 pg 3 47 112 Finisher Stapler Move Sensor Off Failure 12 242 pg 3 47 113 Finisher Stapler Failure 12 244 pg 3 49 114 Finisher Front Tamper Home Sensor Failure 12 252 pg 3 51 115 Finisher Rear Tamper Home Sensor Failure 12 253 pg 3 52 116 Finisher Stacker Height Sensor Off Failure 12 254 pg 3 53 117 Finisher Stacker Tray Failure 12 255 pg 3 55 118 Finisher Stapler Front Corner Sensor On Failure 12 256 pg 3 57 119 Finisher Stapler Front Corner Sensor Off Failure 12 257 pg 3 57 120 Finisher Eject Clamp Home Sensor On Failure 12 260 pg 3 58 121 Finisher Eject Clamp Home Sensor Off Failure 12 262 pg 3 58 122 Finisher Decurler Failure 12 267 pg 3 59 123 Finisher Set Clamp Failure 12 281 pg 3 60 124 Finisher Communication Failure 12 350 pg 3 61 125 Finisher Staple Mode Logic Failure 12 399 pg 3 61 Error Messages and Codes 3 11 Error Messages and Codes Procedures Laser Unit Failure Code 10 Laser Unit Polygon Motor Failure Code 11 Note If this failure reoccurs three times successively an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault see pg 6 20 is performed Applicable Parts Wiring and Plug Ja
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72. 12 13 14 Replace the laser unit Swap the leads of the affected color with another color on the T2 HVPS If the symptom changes replace the T2 high voltage power supply Replace the T3 high voltage power supply Print Quality Troubleshooting 5 15 Missing Band in Direction of Paper Travel All Colors There are areas of the image that are extremely light or are missing entirely These missing areas form wide bands from leading edge to trailing edge B size print shown The printer displays no error code Note A size prints are processed through the printer with the short edge of the print parallel to the direction of the paper path making print artifacts parallel to the short edge of the print 1 Clean the laser windows with the cleaning wand located in the front door 5 16 Leading Edge 3041 40 Phaser 7750 Printer Service Manual Streaks in Direction of Paper Travel There are dark lines running along the Leading Edge page in the direction of paper travel from the leading edge to the trailing edge B size print shown The printer displays no error code Note A size prints are processed through the printer with the short edge of the print parallel to the direction of the paper path B size prints are processed through the printer with the long edge of the print parallel to the paper path making horizontal artifacts parallel to the long axis of the print 1 Run
73. 140 HT Entrance jam A 7 Code Definition Code Definition 140 Entrance jam 165 AutoSelect Needs Paper 141 Compiler exit sensor off jam 166 AutoSelect Needs Heavy 142 Tray 1 Needs Paper 167 AutoSelect Needs Thin 143 Tray 1 Needs Heavy 168 AutoSelect Needs Thick 144 Tray 1 Needs Thin 169 AutoSelect Needs Trans 145 Tray 1 Needs Trans 170 AutoSelect Needs Envelopes 146 Tray 2 Needs Paper 171 AutoSelect Needs Labels 147 Tray 2 Needs Heavy 172 Size Mismatch Load Letter 148 Tray 3 Needs Paper 173 Size Mismatch Load Legal 149 Tray 3 Needs Heavy 174 Size Mismatch Load Statement 150 Tray 4 Needs Paper 175 Size Mismatch Load Executive 151 Tray 4 Needs Heavy 176 Size Mismatch Load Tabloid 152 Tray 2 HC Needs Paper 177 Size Mismatch Load TabloidEx 153 Tray 2 HC Needs Heavy 178 Size Mismatch Load 8x10 154 Tray 3 HC Needs Paper 179 Size Mismatch Load Foolscap 155 Tray 3 HC Needs Heavy 180 Size Mismatch Load US Folio 156 Tray 4 HC Needs Paper 181 Size Mismatch Load Postcard 157 Tray 4 HC Needs Heavy 182 Size Mismatch Load A3 158 MPT Needs Paper 183 Size Mismatch Load A4 159 MPT Needs Heavy 184 Size Mismatch Load A5 160 MPT Needs Thin 185 Size Mismatch Load A6 161 MPT Needs Thick 186 Size Mismatch Load RA3 162 MPT Needs OHP 187 Size Mismatch Load SRA3 163 MPT Needs Envelopes 188 Size Mismatch Load SP Folio 164 MPT Needs Labels 189 Size Mismatch Load Oficio
74. 2 of 2 PL 17 4 No Part Number Qty Description 10 116 1285 00 Top Tray Full Sensor 11 116 1247 00 Exit Sensor 12 116 1286 00 Gate In Solenoid Assembly 13 Gate in Solenoid 14 Spring p o item 12 15 Link 16 Cover 17 Ground Wire 18 Wire Harness 19 Wire Harness 20 Bearing 21 116 1281 00 Gear 37T 22 116 1282 00 Gear 30T 23 116 1283 00 Gear 26T 24 116 1234 00 Interlock Sensor 25 Bracket 26 116 1267 00 Paper Guide 27 Roll 28 Bracket 29 Frame 30 Bracket 31 Screw 11 47 PL 17 5 Covers PL17 5 7750 408 11 48 Phaser 7750 Printer Service Manual Covers PL 17 5 No Part Number Qty Description 1 116 1238 00 Front Cover 2 116 1239 00 Rear Cover 3 116 1236 00 Top Cover 4 116 1237 00 Left Cover 5 116 1245 00 Front Cover Door 6 Left Panel 7 Hinge N S 8 116 1844 00 Magnet 11 49 PL 17 6 Top Cover and Eject Roll 87750 409 11 50 Phaser 7750 Printer Service Manual Top Cover and Eject Roll PL 17 6 No Part Number Qty Description 1 116 1262 00 1 Top Open Cover Assembly 2 Arm 3 Bearing 4 Bracket 5 Spring 6 Support 7 Bracket 8 Shaft 9 116 1302 00 1 Eject Pinch Roll 10 116 1823 00 1 Eject Chute 11 116 1272 00 1 Stack He
75. 3715 34 4 pue swayed 440 0 YWMS eAn2edsa 194 0 102 59215 Jaded smoys IYL 108498 8215 1904 0 994151591 pauiquioo oj Duipuodsa1102 DuipJoooe pasuas si 9215 18064 SALON S z WNOIS 38136 aver 15 035435 3215 805435 3215 v 9 PPS 15 5 5 INTON 1 i i woo 20 oms AUD i i 9 veer p NTON YOSNAS 3715 5 AVUL 918138 371 34 4 8 AVHL 10 47 Paper Size Sensing Switch Table Paper size is sensed according to voltage corresponding to combined resistance of the paper size sensor The table shows paper sizes repective to their ON OFF patterns and voltages 51 52 53 54 Paper Size 0630 00330 00330 0180 007 104 007 105 1007 106 1007 1071 No Tray OFF OFF OFF OFF 4 66 5 OFF OFF OFF ON 4 33 11 x 17 OFF OFF ON OFF 4 01 8 5 13 5 OFF OFF ON ON 3 69 OFF ON OFF OFF 3 38 B5L OFF ON OFF ON 3 07 16K L B5S OFF ON ON OFF 2 75 8 x10 5 8 5 x11 S OFF ON ON ON 2 44 ON OFF OFF OFF 2 15 B4s ON OFF OFF ON 1 83 8KS 4 5 OFF ON OFF 1 52 8 5 x 514 ON OFF ON ON 1 21 ON
76. 4 Registration Transport Assembly 111 Map 3 14 Inverter Transport Assembly 113 Map 3 8 Inverter Transport Assembly 115 Map 17 10 Developer Motor Tray 2 Size Switch 116 Map 2 3 MOB Sensor Assembly 117 Map 2 1 MOB Sensor Assembly 119 Map 11 5 IBT Belt Assembly 121 Map 11 4 IBT Belt Assembly 122 Map 11 2 IBT Belt Assembly 125 Map 19 y Left Lower Assembly Tray 2 Feeder 129 Map 1 10 Xerographic 130 Map 1 9 Xerographic 131 Map 1 7 Xerographic 132 Map 1 5 Xerographic 133 Map 1 16 Xerographic 135 Map 4 5 Duplex Transport Assembly 136 Map 4 6 Duplex Transport Assembly 10 2 Phaser 7750 Printer Service Manual Plug Jack Map Number Item No 140 Map 3 12 Inverter Transport Assembly 144 Map 2 2 MOB Sensor Assembly 150 Map 19 4 Left Lower Assembly Tray 2 Feeder 151 Map 1 12 Xerographic 152 Map 1 15 Xerographic 153 Map 1 19 Xerographic 154 Map 1 17 Xerographic 155 Map 5 3 Registration Transport Assembly 163 Map 9 11 Toner Dispense Motor Main Switch 165 Map 9 8 Toner Dispense Motor Main Switch 171 Map 1 4 Xerographic 172 Map 7 2 Exit Transport Assembly 203 Map 16 10 PWB MAIN Motor LVPS T2 205 Map 19 1 Left Lower Assembly Tray 2 Feeder 207 Map 1 11 Xerographic 208 Map 16 24 PWB MAIN Motor LVPS T2 210 Map 16 22 PWB MAIN Motor LVPS T2 211 Map 6 8 Fuser Assembly 212 Map 6 11 Fuser Assembly 214 Map 12 11 HVPS T1
77. 7750 Printer Service Manual Part List 2 8 Left Cover Assembly 1 of 2 PL2 8 16 PLZ 15 11 10 5 5 n lee 57750 355 Left Cover Assembly 1 of 2 PL 2 8 No Part number Qty Part Description and part name 3 108R00579 2nd BTR Transfer Roller Assembly 2NDBTR ASSEMBLY 12 116 1543 00 Exit Switch Assembly SWITCH ASSY EXIT 14 116 1098 00 Duplex Chute Assembly CHUTE ASSY DUP 16 116 1182 00 Left Cover Assembly 17 116 1759 00 Exit Roller Assembly Service Parts Lists 9 13 Part List 2 9 Left Cover Assembly 2of 2 PL2 9 10 11 13 16 17 25 11 M pg ERN PROCES 57750 356 Left Cover Assembly 2 of 2 PL 2 9 No Part number Qty Part Description and part name 3 116 1760 00 Second Motor Assembly MOTOR ASSY 2ND 6 116 1544 00 Paper on Belt POB Sensor 17 114 1542 00 Damper Gear 45Tooth GEAR ASSY DAMPER 45T 9 14 Phaser 7750 Printer Service Manual Part List 2 10 Exit Transport Assembly PL2 10 1 2 18 Exit Transport Assembly PL 2 10 87750 357 No Part number Qty Part Description and part name 1 116 1762 00 Exit Transport 2 116 1196 00 Exit Transport Cover Service Parts Lists Part List 2 12 Tray 1 1 of 2 PL2 12 87750
78. Black 55 2 15 RegiCon 2 17 1 Skew Fine 2 19 2 IN OUT SEU 2 19 3 Center 2 19 Service Manual xiii 4 Skew Rough 2 19 View the RegiCon 5 2 20 Sell SOLIS ai oY wh RAN a ahh beh adii 2 22 SENSUS DUET ITI 2 24 ADC SENSO Prae ad a Bust 2 25 ADC Output 2 26 Lower Tray Feeders Sensor and Board Locations 2 28 3 Error Messages and Codes 3 2 Accessing the Printer s Error 3 2 Service 5 3 3 Service RIP Every Call Procedures 3 4 Overview for Troubleshooting Error Codes 3 5 Using the Troubleshooting Procedures 3 5 System Startup and 5 3 7 Power On Self Test 3 7 POST Faults ces 3 8 Error Messages and Codes Index 3 10 Error Messages and Codes 3 12 Black ATC Sensor Failure
79. Connection 3 GFI Reset Button General Information 7750 446 4 AC Power Cord Connection 5 Latch for Left Door A 6 Tray 1 MPT in closed position 1 5 Phaser 7750 Front Panel Configuration The printer s front panel consists of one LED a display window and six buttons These buttons are used to navigate the menu system perform functions and select modes of operation for the printer LED Indicators Green Ready to Print Flashing Green Receiving Processing Data Printing or Power Saver Mode Flashing Yellow Warning Flashing Red Continuously Error Front Panel Button Descriptions 1 2 4 6 7 8 7750 447 1 LED Power Status 5 Up button scrolls up the menu system 2 Graphic front panel display 6 Down button scrolls down the menu system 3 Cancel button 7 OK select button 4 Back button 8 Information button for additional explanation or help Front Panel Shortcuts Mode Press this selection at Power On Skip execution of POST diagnostics OK Print Service Diagnostics Map INFO Reset PostScript NVRAM BACK OK Password Bypass UP DOWN Enter Service Diagnostics BACK INFO 1 6 Phaser 7750 Printer Service Manual Image Processor Board and Rear Panel Host Interface The components on the image processor board are illustrated in the following figure 5 8 3 7750 170 1 RAM SODIMM 6 Processor Fan 2 RAM SODIMM 7 NVRAM 3 USB Co
80. Cover COVER L H R LOW 8 116 1914 00 Left Hand Front Lower Cover COVER AY L H F LOW MN 9 116 1808 00 Top Rear Cover COVER TOP REAR 9 38 Phaser 7750 Printer Service Manual Part List 11 1 Inverter Transport 1 PL11 2 87750 383 Inverter Transport PL 11 1 No Part number Qty Part Description and part name 1 116 1809 00 Inverter Transport Assembly TRANSPORT ASSY INV Service Parts Lists 9 39 Part List 12 1 Duplex Unit Assembly PL12 1 2 3 14 Duplex Unit Assemhly PL 12 1 11 7150 385 No Part number Qty Part Description and part name 2 116 1810 00 Duplex Transport Assembly TRANSPORT ASSY DUP 9 40 Phaser 7750 Printer Service Manual Part List 13 1 Image Processor and Engine Control Boards Boards PL 13 1 7750 470 No Part number Qty Part Description and part name 1 116 1812 00 Chassis Assembly w o Engine Board 2 116 1811 00 Engine Control Board PWB MCU 3 650 4306 00 Image Processor Board 671 5316 80 4 156 4837 00 128 MB RAM SODIMM 156 4663 00 256 MB RAM SODIMM 156 4857 00 512 MB RAM SODIMM 5 650 4311 00 Internal Hard Drive 6 116 1836 00 Not Shown Electrical Chassis Cooling Fan 7 163 1506 00 Cofiguration Chip Base 163 1507 00 Configuration Chip Network Service Parts Lists 9 4 Part List 16 1 Lower Trays 3 4 5 Assembly PL16 1 2 PL16 2 8 PL16 4 7150 3
81. Diagnostics by Reboooting the Printer 1 Turn the printer power OFF 2 Hold down the Back and Information buttons simultaneously and turn the printer back ON 3 Continue to hold the buttons until the following message is displayed on the front panel Service Diagnostics V Initializing and then release the buttons 4 The front panel displays the Service Diagnostics Menu m You can print a Service Diagnostics Menu Map by highlighting Print Service Diagnostics Menu and pressing OK The printer will now run through POST and return to Ready You will need to re enter service diagnostics Entering hidden service menu without rebooting the printer 1 Scroll to the Troubleshooting gt Service Tools gt Printer Status Page menu 2 Hold down the Up and Down buttons simultaneously 4 2 Phaser 7750 Printer Service Manual Service Diagnostic Front Panel Button Descriptions Button Function BACK Returns to the prior higher level menu structure if available If help text is displayed on the front panel pressing BACK restores the current menu item and remove the help text CANCEL Terminates the current test Cancels current INFO display INFO Provides help information if available Pressing INFO again restores the current menu item and removes the help text UP Scrolls up one menu item within a menu list This control does not wrap Used to increment data in tests requiring user input DOW
82. For a definition of the numeric codes see Service Usage Profile Status Codes on page A 5 a Goto Troubleshooting gt Service Tools gt Service Usage Profile and press OK If the Printer is Unable to Print If the printer is connected to a network and has a TCP IP address view the printer s web page using a web browser 1 Open a web browser 2 Enter the printer s IP address as the URL 3 Select the Troubleshoot link and the fault history displays 3 2 Phaser 7750 Printer Service Manual Service Checklist This checklist is an overview of the path a service technician should take to service the Phaser 7750 printer and it s options Step 1 Identify the Problem 1 2 3 Verify the problem reported by the customer Check for any error codes and write them down If the printer is capable of printing print normal customer prints and service test prints to Make note of any print quality problems in the test prints Make note of any mechanical or electrical abnormalities present Make note of any unusual noise or smell coming from the printer while printing Print a Usage Profile if the printer is able to print and or view the fault history under the Service Tools Menu Verify the AC input power supply is within proper specifications by measuring the voltage at the electric outlet while the printer is running Step 2 Inspect and Clean the Printer Switch OF
83. HH MM Reset File Security Startup Page Power Saver Timeout Low Toner Warning Level Fuser Warning Point Imaging Unit Warning Point Date and Time Intelligent Ready Metric Defaults Power Saver Printing Optimization Reset Printer Controls 48 Paper Tips Page Online Jam Prevention Guide amp Troubleshooting Print Quality Page amp Color Test Pages Solid Fill Pages amp Repeating Defects Page Remove Print Smears Print Quality Problems gt Network Log Pages gt Service Tools gt Requires DN GX or DXf configuration Tray 3 4 5 Finisher Stored jobs of this type present Printer Status Page Engine Error History Jam History amp Service Usage Profile Email Service Report Reset NVRAM L 18 NetWare Start Log 15 NetWare Runtime Log TCP IP Start Log 48 TCP IP Runtime Log amp AppleTalk Start Log 15 AppleTalk Runtime Log Front Panel Language Front Panel Sound Front Panel Brightness Front Panel Contrast Accessible Front Panel Reset Front Panel Setup Page 2 of 2 A 3 Service Diagnostic Menu Map Service Diagnostics Menu Map Print Service Menu Map Prints a service diagnostic menu map and exits service diagnostics General Status Provides the current print engine status Engine ROM Version Configuration Ambient Temp Humidity Fuser Temperature Fault List Front Panel Adjust Jam Info
84. N a Remove the 2 screws that secure the mounting bracket to the printer frame and remove the switch 7150 240 Service Parts Disassembly 6 53 Main Lever Assembly 7750 249 Reinstallation Procedures Note Slide the main lever gears under the lift jack assembly racks and lift into position Verify that the timing marks on the main lever and the lift jack assemblies align The main lever assembly requires extra pressure approximately 1 from the front of the printer when properly aligned 8 54 Phaser 7750 Printer Service Manual Right Hand Lift Jack Assembly Ti O N Oat Ensure that the lift frame assembly is fully lifted and the main lever is in the down position Remove the accumulator belt assembly Remove RH cover assembly Remove the pivot pin and partially remove the main lever on the right hand side Remove the e clips and washers from the RH lift jack assembly roller guides Remove the 4 screws that hold the RH lift jack bracket and remove the bracket Remove the 2 screws holding the waste auger assembly Remove the 4 screws holding the RH lift jack assembly and remove from the printer Reinstallation Procedures Note When reinstalling the RH lift jack assembly install the screws as follows 1 Upper left 2 Upper right 3 Then the lower screws Verify that the timing marks on the main lever and the lift jack assembly align Left Hand Lift Jack Assembly 1
85. Questions Yes No 1 1 Enter service diagnostics and print Complete Color Go to step 2 the Grid 1 Dot test print registration problem 2 Do all colors align correctly is not related to RegiCon 2 1 Perform the procedure Resetting Complete Go to step 3 Engine on page 6 17 using the original hard drive from the printer if the hard drive has been replaced 2 Reprint the Grid 1 Dot test print 3 Do all the colors align correctly now 3 1 Perform the RegiCon 1 Fine Skew Perform skew Go to step 8 Adjustment on page 6 7 correction 2 Do the results indicate the testhas adjustments as passed indicated in the second panel data until less that 5 clicks are required for each color Go to step 4 Adjustments and Calibrations 6 5 Troubleshooting Procedure Step Actions and Questions Yes No 4 1 Perform the RegiCon 2 In Out Perform skew Go to step 8 Skew Adjustment on page 6 8 correction 2 Do the results indicate the testhas adjustments as passed indicated in the panel data until less that 5 clicks are required for each color Go to step 5 5 1 Perform the RegiCon 3 Center Go to step 7 Go to step 6 Skew Adjustment on page 6 9 2 Do the results indicate the test has passed 6 1 Verify the MOB sensor is correctly Go to step 7 Diagnose and positioned in the center and repeat repair the MOB the RegiCon 8 test sensor 2 Does the test pass now
86. RP RP RP SEES 1 5 Phaser 7750 Front Panel Configuration 1 6 Image Processor Board and Rear Panel Host Interface 1 7 Routine Maintenance Items and Consumables 1 8 Printer 5 1 9 Physical Dimensions and 1 9 Mounting Surface 1 10 Functional 1 12 Electrical Specifications 1 12 Environmental 5 1 13 Media and Tray Specifications 1 13 2 Theory of Operation Summary of the Phaser 7750 Print 2 2 Paper Path of the 2 4 Paper Size 5 5 2 5 Paper Feeding and Sensing 2 5 isses ip Peewee 2 8 EAMG TONG o 2 9 Technology 2 10 Standby 2 10 Machine Run Control 2 10 pe ER uS ER ER aa 2 11 System Power 2 13 ROS and Regicon Technology Overview 2 15 Write
87. Right Side Cover disassembly 8 4 RIP Procedures 3 4 ROS overview 2 15 rough skew theory of 2 19 Routine Maintenance Items diagram 1 8 5 secondary transfer 2 3 Sensors diagnostic tests 4 5 theory of 2 22 service checklist 3 3 Service Diagnostics entering 4 2 front panel key description 4 3 menu tests table 4 3 NVRAM Resets 6 19 overview 4 2 service menu map 4 3 Shutter Solenoid diagnostic test 4 11 Shutter Solenoid Assembly disassembly 8 16 Solenoid Tests diagnostic test 4 11 Stack Full Sensor diagnostic test 4 6 stack height sensing 2 6 Service Manual Startup 3 7 Steering Drive disassembly 8 29 Steering Motor diagnostic test 4 9 Store Engine NVRAM diagnostics 4 13 storing engine NVRAM 6 21 System boot sequence 3 7 T T2 High Voltage Power Supply disassembly 8 47 Take Away Clutch diagnostic test 4 11 temperature humidity diagnostics 4 3 Temperature Humidity Sensor diagnostic test 4 5 Test Prints color test pages 5 5 fast scan 8 tone 5 11 front panel 5 4 grid 1 dot 5 10 paper path options 5 9 print fast scan 8 tone diagnostics 4 5 print grid 1 dot diagnostics 4 5 print halftones 5 10 diagnostics 4 5 print laser check 5 9 diagnostics 4 5 remove print smears 5 8 repeating defects page 5 8 service diagnostic 4 4 solid fill pages 5 7 test pattern 5 6 theory of operation 2 1 Tone Up Down diagnostic test 4 12 toner EA theory of 2 9 Toner Dispens
88. Sensor Ens Pick Roll Sensor Out Sensor M Tray 5 Feed 2 Out Sensor Tray 2 5 Paper Path 7750 456 Theory of Operation 2 5 Stack Height Sensing The pick roller feeds the paper to the paper path As paper continues to feed the stack height drops When it reaches a certain level an actuator unblocks the stack height sensor The control logic then stops paper feed and raises the paper tray This causes the actuator flag to block the stack height sensor again which signals the control logic to resume feeding paper The stack height sensing operates the same way for Trays 2 3 4 and 5 Paper Present Sensing When the last sheet is fed from any of the four main trays the no paper sensor actuator drops into an opening in the paper tray and unblocks the no paper sensor Tray 1 MPT Loading and Feeding Registration Tray 1 Tray 1 Takeaway Clutch Solenoid Roll Registration Tray 1 Feed Roll Roll Registration Tray 1 No Paper Sensor Sensor Mv OHP Sensor Takeaway Clutch 7150 457 When media is placed in Tray 1 the lead edge deactuates the Tray 1 no paper sensor The sensor signals the control logic that paper is present When the last sheet of paper is fed from the tray the actuator drops through the opening of the tray and activates the sensor When the user prints from Tray 1 the control logic supplies mechanical drive to the feed roller and nudger When the control logic calls for
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90. and press OK 2 Highlight Service Tools and press OK Press Up and Down Arrow buttons simultaneously to enter the Hidden Service menu Highlight Run Service Diagnostics and press OK to enter Service Diagnostics Highlight NVRAM Access and press OK Highlight Clear Tech Rep Faults and press OK Highlight the Link Code s to be reset and press OK oc Diagnostic Engine NVRAM Reset Reset NVRAM allows PostScript to write stored data from the hard drive to engine NVRAM You must restore engine NVRAM after replacing the Engine Control Board 1 From the Main Menu highlight Troubleshooting and press OK 2 Highlight Service Tools and press OK 3 Press the Up and Down Arrow buttons simultaneously to enter the Hidden Service menu 4 Highlight Run Service Diagnostics and press OK to enter Service Diagnostics 5 Highlight NVRAM Access and press OK 6 20 Phaser 7750 Printer Service Manual 6 Highlight Reset Engine NVRAM and press OK 7 Select the specific entry desired Yes or No and press OK Store Engine NVRAM This function reads values from the engine NVRAM and writes values to the hard drive It overwrites NVRAM values stored on the hard drive You must store values to the hard drive before replacing the engine control board W Engine Control Board You must store engine NVRAM values to the hard drive after replacement of the hard drive 1 From the Main Menu highlight Troubleshooting and pre
91. code 70 71 72 73 3 36 Imaging Unit Drive disassembly 8 52 Imaging Unit Motor service diagnostics 4 9 Imaging Unit Plate Assembly disassembly 8 22 Imaging Unit Plate Cover disassembly 8 19 Imaging Unit Rail Assembly disassembly 8 24 Imaging Unit Sensor diagnostic test 4 7 in out setup theory of 2 19 in out skew 6 3 Interlocks diagnostic tests 4 5 Internal Hard Drive disassembly 8 39 Inverter Transport Assembly disassembly 8 14 J Jam info diagnostics 4 4 Jam Sensors diagnostic tests 4 6 L Laser Control Y Index 4 wiring diagram 10 40 Laser Power Check diagnostic test 4 12 Laser Scan Drive Control wiring diagram 10 41 Laser Shutter Control wiring diagram 10 42 Laser Unit laser unit failure code 10 3 12 polygon motor failure code 11 3 12 theory of 2 15 Laser Unit ROS disassembly 8 36 LD Power Relay disassembly 8 45 LED POST blink patterns 3 8 Left Cover Assembly Left Door disassembly 8 11 Left Hand Lift Jack disassembly 8 55 Left Hand and Right Hand Gear HCF disassembly 8 62 Left Hand Lower Cover disassembly 8 8 Left Hand Rear Mid Cover disassembly 8 7 loading and feeding tray 1 2 6 Low Voltage Power Supplies disassembly 8 44 LTA Rear Cover disassembly 8 57 LTA Right Side Door disassembly 8 57 Cover disassembly 8 58 LVPS Control wiring diagram 10 33 Macintosh troubleshooting 4 23 Main Drive Service Man
92. contamination 5 22 banding 5 19 light prints all colors 5 13 missing bands 5 16 one color faded or missing 5 15 print is mottled 5 25 random missing spots 5 21 repetitive marks 5 20 spotting 5 19 streaks 5 17 toner on back of print 5 24 unfused image 5 23 troubleshooting procedures how to use 3 5 W Waste Auger disassembly 8 35 Waste Cartridge Sensor Holder disassembly 8 18 Waste Toner Cartridge full detection sensor failure code 78 3 38 Wiring Diagrams 10 29 Index 8 071 0864 00
93. control board and the developer housing assembly 3 the wiring harness defective 8 Run approximately 10 pages of the solid fill full page prints for this color to ensure the error is cleared 3 16 Phaser 7750 Printer Service Manual Transfer Roller Contact Failure Code 20 Transfer Roller Retract Failure Code 21 The Transfer Roller did not meet the contact position or the Transfer Roller did not reach the retract position Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Left Door m Retract Home Sensor Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Enter service diagnostics and run the Go to step 2 Go to step 5 2nd BTR Motor test 2 Does the motor operate correctly 2 1 Clean the 2nd BTR retract sensor Go to step 3 Complete 2 Does the error still occur 3 1 Use service diagnostics transmissive Go to step 4 Replace the sensor test sensor or left 2 Does the sensor operate correctly hand door assembly 4 1 Check the transfer roller transmission Replace the left Go to step 6 gears for damage hand door 2 Are the gears damaged assembly 5 1 Remove the left hand rear mid cover Replace the left Go to step 6 2 Inspect the left hand cover assembly hand cover wiring harness for damage and ensure assembly the connectors are all properly seated 3 Isthe wiring harness damaged 6 1 R
94. control repair the board 24 VDC interlock circuit 6 1 Check the tamper front home sensorin Replace the Repair the sensor diagnostics 2 Does the value change from H to L when the tamper is moved away from the home position finisher control board using the Transmissive Sensor troubleshooting procedure Error Messages and Codes 3 51 Rear Tamper Home Sensor Failure Code 115 With the Rear Tamper Home Sensor OFF the Rear Tamper Home Sensor did not turn On within 800 ms after the move to the Rear Tamper Home position has begun With the Rear Tamper Home Sensor on the Rear Tamper Sensor did not turn Off when the Rear Tamper Home Sensor is deactuated Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Rear Tamper Motor Finisher Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Run the Rear Tamper Low Front Go to step 6 Go to step 2 Rear Tamper Low Rear test in diagnostics 2 Does the rear tamper guide operate 2 Does the rear tamper motor operate Check the Go to step 3 tampering mechanism for a mechanical problem 3 1 Check pins J878A pins 1 3 4 and 6 Go to step 4 Go to step 5 2 18 24 VDC present on any of the pins 4 1 Check the following wires for and open Repair or replace Replace in order circuit or short circuit to ground the wiring until resolved 2 any wire open or shorted harness
95. directly from Xerox at www xerox com office supplies Xerox has tested this product to internationally accepted electromagnetic emission and immunity standards These standards are designed to mitigate interference caused or received by this product in a normal office environment This product is also suitable for use in a residential environment based on the levels tested In the United States this product complies with the requirements of an unintentional radiator in part 15 of the FCC rules Operation is subject to the following two conditions 1 this device may not cause harmful interference 2 this device must accept any interference received including interference that may cause undesired operation Canada This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications ICES 003 Le pr sent appareil num rique n met pas de bruits radio lectrique d passant les limits applicables aux appareils num riques de la classe B prescrites dans le R glement sur le brouillage radio lectrique dict par le ministere des Communications du Canada NMB 003 Service Manual ix European Union Xerox Corporation declares under our sole responsibility that the printer to which this declaration relates is in conformity with the following standards and other normative documents Following the provisi
96. disassembly 8 46 2nd BTR Motor diagnostic test 4 9 2nd BTR Retract Sensor diagnostic test 4 6 3 3 VDC disassembly 8 44 5 VDC disassembly 8 44 A AC Power disassembly 8 48 troubleshooting 4 16 Accumulator Belt disassembly 8 34 home position failure code 31 3 19 home position took too long code 30 3 19 Service Manual unexpected belt edge sensor failure code 32 3 22 unexpected home sensor signal code 33 3 24 Accumulator Belt Drive disassembly 8 50 Accumulator Belt Motor diagnostic test 4 9 Accumulator Belt Mounting Frame disassembly 8 33 Accumulator Belt Sensor mark on belt mob diagnostic test 4 6 ADC Output Check diagnostic test 4 12 ADC Sensor diagnostic test 4 7 output check 2 26 theory of 2 25 ADC Shutter Close diagnostic test 4 11 ADC Shutter Open diagnostic test 4 11 adjustments 6 1 ATC sensor setup 6 14 center skew 6 4 coarse and fine skew 6 3 fine skew 6 7 in out skew 6 3 Regicon procedures 6 5 adjustments calibrations diagnostic tests 4 11 Agitator Motor diagnostic test 4 10 application troubleshooting 4 23 ATC Sensor black failure code 15 3 15 cyan failure code 14 3 13 Index 1 diagnostic test 4 7 magenta failure code 13 3 13 setup adjustment 6 14 theory of 2 24 yellow failure code 12 3 13 ATC Sensor Setup diagnostic test 4 11 Belt Cleaner disassembly 8 34 Belt Edge Learn diagnostic test 4 11 Belt Edge Sensor diagno
97. door switch then to the engine control interface board out to the R H door switch back to the engine control interface board out to the front door through the coil of the LD power relay and back to the 5 VDC LVPS This circuit helps identify which door has interrupted the 24 VDC circuit If the circuit is complete LD power relay activates and 5 VDC is sent to the waste cartridge installed interlock switch and through all four imaging unit connectors and to the engine control interface board This signal merely confirms that all imaging units are installed Individual missing components are identified at power up or when a door is closed completing the 24 VDC circuit and the engine control board interrogates the imaging unit NVRAM If the imaging units are present then the waste cartridge is missing by default 1 With all doors closed and printer power on check for 5 VDC between P536 4 of the engine control interface board and frame ground If not present check the LD relay and the LH cover interlock switch 2 Check for 5 VDC between P631 3 of the engine control interface board and frame ground If not present check the front cover interlock switch 3 Check for 5 VDC between J568 5 top pin of the LD power relay and frame ground If not present check the RH cover interlock switch 4 Check for 5 VDC between J400 6 of the engine control interface board and frame ground If not present check the LD power relay and the circui
98. ground earth symbol Hot surface on or in the printer Use caution to avoid personal injury The surface is hot while the printer is running After turning off the power wait 30 minutes Avoid pinching fingers in the printer Use caution to avoid personal injury Use caution or draws attention to a particular component Refer to the manual s for information iv Phaser 7750 Color Laser Printer Power Safety Precautions Power Source For 110 VAC printers do not apply more than 140 volts RMS between the supply conductors or between either supply conductor and ground Use only the specified power cord and connector For 220 VAC printers do not apply more than 264 volts RMS between the supply conductors or between either supply conductor and ground Use only the specified power cord This manual assumes that the reader is a qualified service technician Plug the three wire power cord with grounding prong into a grounded AC outlet only If necessary contact a licensed electrician to install a properly grounded outlet If the product loses its ground connection contact with conductive parts may cause an electrical shock Disconnecting Power Turning the power off using the On Off switch does not completely de energize the printer You must also disconnect the printer power cord from the AC outlet Position the power cord so that it is easily accessible during servicing so that you may power down the printer during an emerg
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100. panel s Printer Setup Menu select Calibration Setup then select Calibrate for Paper type heavier housing assembly Print Quality Troubleshooting 3041 46 This could be cold offset Set the paper type at the printer s front panel to one Run the solid fill test pages From the front panel s Troubleshooting Menu select Print Quality Problems then select Solid Fill Pages If the missing spots only occur in a single primary color replace the developer 5 21 Background Contamination There is toner contamination on all or most of the page The contamination appears as a very light gray dusting The printer displays no error code 1 Ensure that the loaded media matches the front panel settings In some cases switching the paper type setting for example from Heavy Laser Paper to Thin Cover Index may improve print quality 2 Run the Calibrate for Paper routine From the front panel s Printer Setup Menu select Calibration Setup then select Calibrate for Paper Note Printing on some specialty papers such as some glossy finish papers may show some background contamination 3 Inspect the imaging units for contamination Replace the imaging units if necessary 4 If the transfer roller or belt cleaner assembly is near the end of its life replace that part 5 If the background contamination is a primary color and that primary color is missing from the pri
101. present unplug the top connector and retest If no voltage is present replace the LVPS If the voltage returns check the harness image processor board engine board and relay board for shorts o Troubleshooting the 24 VDC LVPS Note Switch off power and disconnect the power cord The 24 VDC LVPS requires a 5 VDC enable signal to operate Ensure proper operation of the 5 VDC LVPS before proceeding 1 Remove the rear cover and 24 VDC PS metal shield 2 Connect AC power and switch the printer ON 3 Check for proper AC voltage at the connector at the bottom of the LVPS If not present go to Troubleshooting AC Power on page 4 16 4 Check for the 5 VDC enable signal at P505 3 grey wire 5 If not check the same signal at the engine interface board P537 6 If not present replace the engine control board then the engine interface board 6 Check for 24 VDC at any of the orange wires of connector P502 at the top of the LVPS 7 Unplug the connector and retest 8 If still no voltage replace the LVPS If the voltage returns check all 24 VDC circuits for shorts to frame ground in the wiring harness engine board relay board and interlock circuit 4 18 Phaser 7750 Printer Service Manual Interlock Circuit Diagram PRINT CARTRIDGE CRUM CONNECTORS
102. rear 548 Map 23 15 TT Module rear 549 Map 23 13 TT Module rear 551 Map 16 25 PWB MAIN Motor LVPS T2 10 5 Title Jack Map Number Item No 552 Map 16 26 PWB MAIN Motor LVPS T2 552 Map 23 6 TT Module rear 553 Map 16 17 PWB MAIN Motor LVPS T2 553 Map 23 10 TT Module rear 554 Map 23 11 TT Module rear 555 Map 23 5 TT Module rear 557 Map 23 2 TT Module rear 561 Map 23 12 TT Module rear 564 Map 23 3 TT Module rear 568 Map 16 2 PWB MAIN Motor LVPS T2 569 Map 16 27 PWB MAIN Motor LVPS T2 570 Map 12 4 HVPS 1 24V LVPS 57 Map 12 17 HVPS T1 T3 24V LVPS 57 Map 12 3 HVPS 1 24V LVPS 57 Map 12 1 HVPS 1 24V LVPS 57 Map 12 18 HVPS 1 24V LVPS 57 Map 16 12 PWB MAIN Motor LVPS T2 57 Map 16 11 PWB MAIN Motor LVPS T2 580 Map 12 14 HVPS 1 24V LVPS 581 Map 12 2 HVPS 1 24V LVPS 590 Map 18 5 AC Drive PWB Noise Filter PWB Delay PWB 592 Map 18 6 AC Drive PWB Noise Filter PWB Delay PWB 593 Map 18 14 AC Drive PWB Noise Filter PWB Delay PWB J600 Map 5 1 Registration Transport Assembly P600 Map 6 10 Fuser Assembly 602 Map 1 24 Xerographic 605 Map 11 1 IBT Accumulator Belt Assembly 608 Map 1 25 Xerographic J610 Map 8 1 MSI Unit P610 Map 17 3 Developer Motor Tray 2 Size Switch 611 Map 7 5 Exit Transport Assembl
103. recommended that you leave the belt installed and perform the Belt Edge Learn test instead See Belt Edge Learn on page 4 11 Bypass the right hand door interlock switch and observe the steering motor as the test is performed Imaging Unit Motor Do you wish to continue Yes No Motor On Motor Off Please cycle power to printer now NOTE Only run this test once per power cycle to avoid excessive toner being forced inside the developer and damaging it Accum Belt Motor Do you wish to continue Yes No Motor On Motor Off Please cycle power to printer now NOTE The accumulator belt must be removed prior to running this test 1st BTR Retract Contact Motor Press Back or Cancel to abort NOTE Repeated executions of 1st BTR Motor Test will cause Motor Retract Motor Contact Motor Retract etc 2nd BTR Motor 2nd BTR Motor is Retract This test toggles between the two values of Retract and Contact Motor Off NOTE This test needs to be run twice to return the motor to a retracted position Duplex Motor Duplex motor is On Turn Motor On Low Speed Turn Motor On High Speed All Motors Off Press Up Down to change setting Paper Feed Motors Feed Motor 2 3 4 5 NOTE Running this test causes a static jam Clear paper path after running this test Paper Lift Motors Lift Motor 2 3 4 5 Press Up Down to change setting General Troubl
104. shown in the figure below IBT Assembly Release m Lift the accumulator belt assembly release and pull the accumulator belt assembly out until the stand plate is accessible Remove two screws that hold the stand plate on the front and rear of the accumulator belt assembly Lift the stand plate as shown in the figure below and remove it 2 20 Phaser 7750 Printer Service Manual Reinsert the accumulator belt assembly into the Phaser 7750 printer without the Stand Plate The area that was covered by the Stand Plate will be the area in which you see the images on the accumulator belt With the right hand door interlock activated turn the printer on Note For machines with finishers unplug the finisher from the Phaser 7750 printer prior to powering up It will be necessary to have the finisher undocked to view the images on the belt As soon as the chevrons are visible deactivate the right hand door interlock Theory of Operation 2 21 Sensors Looking at the imaging path illustration below note that there are two kinds of sensors that play an important role in the control of image quality for the printer Fuser gt Output gt Board Internal C Test Toner Patterns Cartridge Transfer Roller 097 lt Engine Board Imaging Unit Developer Housing amp ATC Sensors Charge Rolls Network cable 7750 452 Tr
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106. tests are activated by pressing Take Away Clutch Clutch On Clutch Off Developer Clutch Clutch On Clutch Off Registration Clutch Clutch On Clutch Off OK Listen for the clutch Test times out after 1 second Duplex Clutch Which Direction CCW CW Clutch On Clutch Off Finisher Clutches Decurler Cam Clutch Clutch On Clutch Off Solenoid Tests Tests functionality of the solenoids by a ctivation one solenoid at a time Exit Gate Solenoid Solenoid On Solenoid Off Duplex Gate Solenoid On Solenoid Solenoid Off Shutter Solenoid Solenoid On Press OK to run test Solenoid Off ADC Shutter Open Solenoid On ADC Automatic Density Correction Press OK to run test ADC Shutter Close Solenoid Off ADC Automatic Density Correction Press OK to run test Tray 1 MPT Feed Solenoid On MPT Multi Purpose Tray Solenoid Solenoid Off Press OK to run test Finisher Solenoids Set Clamp Paddle HTrans Gate In Open HTrans Gate In Close Press OK to run test Adjustments Calibrations Performs adjustments calibrations and operations essential to the performance of the printer For details on performing the RegiCon procedures see RegiCon Adjustment Procedures on page 6 5 Belt Edge Learn OK or Failed ATC Sensor Setup See to ATC Sensor Setup on page 6 14 TRC Adjust Displaces toner rendering curve points not technician adjustable General Tro
107. the LVPS fan if the wiring is OK replace the engine control board 9 Does the front panel indicate the fans are ON Replace the LVPS assembly Check the wiring to the LVPS fan if the wiring is OK replace the engine control board 3 34 Phaser 7750 Printer Service Manual Imaging Unit Motor Failure Code 60 Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Imaging Unit Drive Motor Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Enter service diagnostics run the Go to step 7 Go to step 2 Imaging Unit Motor test 2 Does the motor operate correctly 2 1 Is the voltage at J210 5 5 VDC Go to step 3 Replace the engine control board 3 1 Is the voltage at J210 7 24 VDC Go to step 4 Use the 24 VDC wirenets to troubleshoot and resolve the missing voltage 4 1 Enter service diagnostics Go to step 5 Replace the 2 While running the Imaging Unit Motor engine control test check the voltage at J210 1 and board J210 2 3 the voltage 0 VDC while the test is running Is the frequency between J210 4 and Replace the Go to step 6 ground between 1 KHz and 1 3 KHz imaging unit drive motor 6 1 Check for a short to ground at J210 4 Repair or replace Replace the 2 Is the wire grounded the wiring engine control harness board 7 1 Enter service diag
108. the solid fill test pages From the front panel s Troubleshooting Menu select Print Quality Problems then select Solid Fill Pages If the missing bands only occur in a single primary color replace the imaging unit of the affected color or swap imaging units and run another test print Note Under some circumstances streaking may occur in the margin of SRA3 size paper This is due to the edges of the paper extending beyond the end of the imaging components Print quality in the margins of SRA3 paper is not guaranteed 2 Print the repeating defects page do the lines streaks align with any of the repeating defect marks 3 Inspect the accumulator belt cleaner replace the cleaner if necessary 4 Replace the developer housing assembly if the defect is in one color only 5 Run the Remove Print Smears routine If the defect returns replace the fuser Print Quality Troubleshooting 5 17 Streaks Parallel With the Leading Edge There are dark lines running parallel with the leading edge of the print perpendicular to direction of paper travel B size print shown The printer displays no error code Note A size prints are processed through the printer with the short edge of the print parallel to the direction of the paper path making print artifacts parallel to the long edge of the print B size prints are processed through the printer with the long edge of the print parallel to the paper path making arti
109. the wiring harness The wiring harness feeds through the access hole at the pivot point and up to the connector When reassembling be sure the wire harness is behind the mounting tab 3 Disconnect the wiring harness and clip from the printer s frame and pull the harness through the access hole 4 Remove 2 screws securing Tray 1 and then pull the assembly out of the printer A slight lift on the right hand side of the assembly may help remove it from the printer 87700 132 Reinstallation Procedures Note The duplex chute must be in the up position to install Tray 1 Open Door A position the chute in the proper position and then close the door Caution When reinstalling Tray 1 make certain you DO NOT pinch the wire between the left bracket and the left screw hole Service Parts Disassembly 8 9 Tray 1 MPT Paper Pick Rollers 1 Open the Left Hand Door A and locate the pick rollers near the duplex chute 2 Lift the tab and slide the white retainers away from the pick rollers 3 Slide the pick rollers off the retaining pins 4 Lift and remove the pick rollers 7750 159 8 10 Phaser 7750 Printer Service Manual Left Cover Assembly Left Hand Door A Remove the rear cover see page 8 6 Remove the Left Hand Rear Mid Cover see page 8 7 Remove Tray 1 see page 8 9 Remove the fuser front cover Open the left cover Remove screw from the plastic harness cover and remove the cover
110. to give better visibility 1 As the main drive assembly is being installed into position make sure the gears are meshed completely with the mating gears by slightly rotating the main motor until the main motor bracket seats without stress and is flat against the frame 2 Rotate the main drive after installing the assembly to ensure it rotates freely and ensure it is FLAT against the frame Caution It is easy to pinch or short wires under the main drive assembly bracket 3 Make sure that the red transfer roller wire is connected near the right side of the main drive assembly to its mating connector on the frame Service Parts Disassembly 8 49 Accumulator Belt Drive Assembly 1 Remove the rear cover and shield 2 Move the and power supplies out of the way 3 Remove any components covering the motor which is mounted to the frame at the rear top left corner 4 Remove the 3 screws that secures the motor and bracket assembly to the frame and remove the assembly 7750 123 8 50 Phaser 7750 Printer Service Manual Developer Drive Assembly 1 Remove the 3 3 VDC and 5 VDC power supply and bracket assembly see page 8 44 2 Disconnect the wiring harness from the developer drive assembly 3 Clear the high voltage lines 4 Remove the 2 black screws securing the developer drive assembly to the printer frame and remove from the printer 7750 124 Replacement Procedures Ca
111. type matches the settings on the front panel Check the fuser exit sensor and the POB sensor in service diagnostics Are the margins on the page greater than 3 mm Check the fuser area for debris Visually inspect the fuser baffle for burrs Test the paper path switches and sensors in service diagnostics Replace the fuser Replace the engine control board Exit Jams T Is the paper in good condition and appropriate for a laser printer Is the paper curling Is the printer printing within its environmental specifications Ensure that the loaded media type matches the front panel settings Is the jam caused by a heavy stiff paper being used for two sided printing In such cases a lighter grade of paper should be used Clean all the eject rollers with a clean dry lint free wipe if debris is visible Does the exit sensor flag properly actuate its sensor Test the sensor using Service Diagnostics Test the POB sensor in Service Diagnostics 4 22 Phaser 7750 Printer Service Manual Operating System and Application Problems Windows 2000 Windows XP Windows Server 2003 Troubleshooting TCP IP Note For Windows XP select Classic Look or the Windows XP procedures will not match the steps below To select Classic Look click Start then Settings then Taskbar and Start Menu Select the Start Menu tab then select Classic Start menu Click OK This troubleshooting section assumes you have c
112. until the Clear Tech Rep Fault see pg 6 20 is performed Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Belt Cleaner Accumulator Belt Motor Waste Toner Auger Assembly Interface board Engine Control Board Caution If the accumulator belt is damaged determine the cause of the damage before installing a new assembly Visually inspect the accumulator belt area inside the printer and inside the left hand door for foreign objects or damaged parts Inspect the belt steering mechanism to determine if it is operable It may be necessary to query the user for additional information as to likely causes Troubleshooting Procedure Step Actions and Questions Yes No 1 Have the accumulator belt shipping Go to step 2 Remove the restraints been completely removed restraints Error Messages and Codes 3 19 Troubleshooting Procedure Continued Step Actions and Questions Yes No 2 1 Enter service diagnostics and runthe Go to step 3 Go to step 6 Clear Tech Rep Fault see pg 6 20 04 346 procedure 2 Enter the Adjustments Calibrations menu and run the Belt Edge Learn Test with the right hand door open and the door interlock held actuated 3 Does the accumulator belt rotate during the test 3 1 Remove the accumulator belt Go to step 4 Replace the assembly accumulator belt Caution Removing the accumulator assembly belt
113. 0 600 900 08690 0 LON OW Feld 84 NOW 108103 FOL 10 83 Duplex Drive eur renin 1 LON 926 08 7 B P BA TA I BA i 6 035435 206 6 08010 9er o Se 901 HOLIMS X90 1H31NI 22114 HOLIMS 3 02 X901831NI 1008 8001 08509 83 09 XIANG 1 1 1 E i 18 Iye gyi M BA B go 144915 03995 9098 20 6 G3SN3S 09 over 904 9 9 501 8001 0880 anoa YOSNAS AYM Ad09 100 XINA anya voL 8701 5402 geo Phaser 7750 Printer Service Manual 10 84 Duplex Drive 926 08 7 yeni 0 12100 TA A gy gy 18 LP NE i OIA 5 GaSNas 206 6 08010 9er o Se 901 HOLIMS X90 831NI HOLIMS XANG X901831NI 1006 8001 0594 83 02 i BA BA ma BA 1 8 18 04 2 2 IVNBIS Q3SN3S A 35835 0994 ov
114. 00 06624 ma aca 0384 1100 8001 08694 ma ov 4 Sor 2197 1194 39019 0657 Dm df LTV 0333 41 1411 03 4 318100 an 1417 200 800 08820 6 1333 100 800 0899 Feld NOW SNIMIWLS H3dVd 2 8 7 10 49 Tray 3 Paper Stacking 080 0512 7 1 141915 03836 802 8050459 73 810 6 9 9 1 12 m mi par if T 5 035188 lyse 20183 038888 09 sier 1 1 1 woo 20 805435 YOSNIS 131316 9114 ont ont F BAITIE AVL gt 11 100 06600 t 10L gt Ms 6 318100 y ster 0 9 0 99 0990 spor 891 68114 691679114 19168114 9114 TINTON 5138 318000 TINON 1 AVAL woo 2 01330418 AVL 9 ma 22 35 pz 7 70010 NZNOWOION 1 40 411 0334 8 i 81 14 1100 8001 06620 1100 90 ma 0334 600 800 08690 1 t dN H41 0334 AVH L YUNI WL 7 1 an an 1200 8001 08800001 201105 7 0359 600 9001 08690 17 i 030701 80198340 ANG 03346 4 TA TA 8 8 8 90169 038136 i 1 vier YOSNIS ONEAVHL 1 t omes 1 121 200 06600 A rar t W0020
115. 00 1 and P600 12 assembly 2 Doesthe resistance measure 20 Ohms or less 3 1 Reinstall the fuser assembly Go to step 5 Go to step 4 2 Enter service diagnostics 3 From the Sensor Tests run the Fuser Temperature test 4 15 the temperature indicated approximately 165 C 4 1 Turn OFF the printer power Replace the Repair or replace 2 Check for an open circuit or poor engine control the wiring connection between J641 2 and board harness J404A 2 3 the wiring OK Error Messages and Codes 3 27 Troubleshooting Procedure Continued Step Actions and Questions Yes No 5 Is the line voltage present at FS41 onthe Go to step 6 Go to step 7 AC Drive Board 6 1 Check the wiring harness between Replace the fuser Replace the AC FS41 and J600 1 for an open circuit or assembly power chassis poor connection assembly 2 Is the wiring harness OK 7 Check for 5 VDC at P J 590 5 on the Go to step 8 Replace the Drive Board engine control board 8 Check for 24 VDC at P J 590 1 on the AC Replace the AC Replace the fuser Drive Board power chassis assembly assembly 3 28 Phaser 7750 Printer Service Manual Fuser Sub Lamp Overheat Failure Code 44 The front thermistor has detected an overheat condition Note If this failure reoccurs three times successively an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault see pg 6 20 is perf
116. 0000 99169179 305435 INGON AVEL AIT 318 00 Q339VIS p 3001 3013390 AAG 0333 ma 1 13 30019 NO HOLOW d HIVO333 an an 900 800 066901 1333 600 800 06600 woo 30 30019 NO HOLOW df 11 0333 v AVL an 1417 900 800 066901 0333 900 800 06690 1 9 YILNI WL 2 YILNI WLOQAVc OO WL 30019 3010 90 1311 0333 91 1317 900 800 066901 1103 90 ma 43 0999 600 800 08600 199 usi 284 010 3010 9m 40 141 0333 41 1411 0314 318000 91 1577 900 800 0599 9 65114 0333 1900 8001 066901 TINON 98119416 H3dVd 7 10 51 Tray 5 Paper Stacking 780 05 BA E qu 93 3818 G3SN3s eer E 805135 1 beg 4 21 2 18131 ON S 1621 1001 06600 0 dr woo 2 i 0 11171137 YOSNIS Wadvd ON S AYO A TA E z u 2 gor WNols 035095 Meer 0988 vor 1100 00 805456 WOSN3S 73 81 6 oid i
117. 022 1614 8 44 99 199 EE Er iti 199 EE Er ar YOLOW 194133 ANZ 9 912 9104 ZLI 91114 318000 9 91114 318000 2194 39019 9QAv2 NO YOLOW 1993133 318 ONZ 124138 250 600 08690 1291402 150 600 06220 0 4 V61d 3 1 NOW 240 1 01 48 1 3991 6 Phaser 7750 Printer Service Manual 10 74 Image Transfer to Paper cont d 916 08 7 aq 1ejsue1 290 600 0 uo Burun 319 8 11244 EHO 985 gMd 04000 SdAH 01 NOW 104 NOW 5 jeas Aq 1013002 pue 04102 0 00 ug pug 04409 SdAH 2 NYO YILNI NYO N02 20 W09 20 OIA tosr YOLINOW 3 6 1 18 ANZ WOLINOW 183889 USYSNVUL 818 ANZ 102 600 09190 YOLINOW 39VET0A 379 319 eS 1 334 1 1 8L T 1 1 1 311918 OND 90 IVNV 0ZSf d RAR ALOWSY 379 319 ANZ 7031409 u3M0d ulg 310038 9335 ULE 1250 6001 09190 91 SdAH 0L V61d lt lt
118. 08 8005 81 Imaging Unit 8 116 1101 00 Agitator Motor Assembly MOTOR ASSY AGT 9 20 Phaser 7750 Printer Service Manual Part List 4 2 Xerographic Module 2 of 2 PL4 2 1 2 5 Xerographic Module 2 of 2 PL 4 2 87750 365 Part number Qty Part Description and part name 1 116 1769 00 Xerographic Plate Assembly PLATE ASSY XERO OPB 6 116 1770 00 Image Unit Mounting Rail Y M C ERASE ASST YMC 7 116 1771 00 Image Unit Mounting Rail K ERASE ASST Service Parts Lists 9 2 Part List 5 1 Lift Unit 7750 366 Phaser 7750 Printer Service Manual 9 22 Lift Unit PL 5 1 No Part number Qty Part Description and part name 1 116 1198 00 LH Frame Lift Assembly FRAME ASSY LIFT LH 2 116 1199 00 RH Frame Lift Assembly FRAME ASSY LIFT RH 3 116 1772 00 Bearing 4 116 1773 00 Washer 5 Plate N S 6 116 1202 00 Lift Arm Latch Assembly LATCH ASSY AST 7 116 1200 00 LH Handle Hinge HINGE HANDLE LH 8 116 1201 00 RH Handle Hinge HINGE HANDLE 9 116 1203 00 Pivot Pin SHAFT MAIN 10 116 1204 00 Main Lift Handle Assembly LEVER ASSY MAIN Service Parts Lists 9 23 Part List 5 2 Accumulator Belt Assembly PL5 2 149 10 9 PL5 3 57750 367 Accumulator Belt Assembly PL 5 2 No Part number Qty Part Description and part name 1 116 1774 00 Accumulator Belt
119. 1 2 168 18 81 oanrer 1 1 1 1 1 1 n m 22 42 NO ster Sled 897 6694 819 8194 Ld Li GION3108 319 NIN 01083108 301934409 8002 1890 8001 06600 319 LIXa 318000 318000 2 40 u3183ANI 86701 Phaser 7750 Printer Service Manual 10 82 Duplex Drive Control 968 09 319019 Ave NO YOLOW 319019 Ave NO YOLOW XINA YOLOW 9QAve 2 39019 NO YOLOW XINA _ 319019 Ave NO 6esr YOLOW 20 0 8Md esr TA 9c9r 1 1 1 1 1 1 1 1 1 1 1 1 1 1 TA Lo gy 68 1 9 9094 079 801923 09 91114 318000 XOJdde jo Aouanbay e 990094 01 0094 1091591 1 25 0 210 800 0890 1 295 002 110 800 08600 8 0001 295 0 010 8001 06690 9000 295 008 600 800 0820 uoneunp 960 peadg 0121900 YOLOW fue pue paads uonesado 9 13 1 03346 HOLOW XIANG 210 600 800 06690 0 134 30010 338 HOLOW 31400 210 600 800 08620 13A 0994 20169 1 9097 NO 21
120. 1 Actuate the stacker upper limit sensor in Go to step 2 Troubleshoot diagnostics using the 2 Does the value change between H and L transmissive sensor procedure 2 1 Run the Finisher Stacker Motor Down test Goto step 5 Go to step 3 in diagnostics 2 Does the stacker tray lower 3 Does the stacker motor turn Diagnose and Go to step 4 repair the mechanical problem Check the stacker motor gear stacker tray and belt track gear 4 15 24 VDC present at P J 847 12 with the Replace the Replace the Finisher Stacker Motor Down test running in stacker motor finisher control diagnostics board 5 1 Run the Finisher Stacker Motor Up testin Replace the Go to step 6 diagnostics finisher control 2 Does the stacker tray move up board 6 Does the stacker motor turn Diagnose and Go to step 7 repair the mechanical problem Check the stacker motor gear stacker tray and belt track gear Error Messages and Codes 3 55 Troubleshooting Procedure Continued Step Actions and Questions Yes No 7 15 24 VDC present at P J 847 11 with the Replace the Replace the Finisher Stacker Motor Down test running in stacker motor finisher control diagnostics board 3 56 Phaser 7750 Printer Service Manual Finisher Stapler Front Corner On Failure Code 118 Finisher Stapler Front Corner Off Failure Code 119 Error Code 118 The Staple Front Corner Sensor did not turn ON within 2 seconds after the system started to move to the Fron
121. 1 1 Turn OFF power and remove the fuser Go to step 2 Replace the fuser assembly and allow it to cool down assembly 2 Measure the resistance between the Fuser connector P600 4 and P600 6 3 Doesthe resistance measure between 30 K and 190 K Ohms 2 1 Reinstall the fuser assembly Go to step 4 Go to step 3 2 Enter service diagnostics 3 From the Sensor Tests run the Fuser Temperature test 4 18 the temperature indicated approximately 1659 C 3 1 Turn OFF printer power Go to step 4 Repair or replace 2 Measure the resistance between the wiring J641 2 and J641 3 on the Engine harness Control Board 3 Doesthe resistance measure between 30 K and 190 K Ohms 4 1 Turn printer power back ON Check the AC Replace the 2 15 there 3 4 VDC between wiring harness to engine control J590 5 and ground the fuser board If the check is OK replace the AC drive assembly Error Messages and Codes 3 25 Install or Reseat Fuser Code 41 Front thermistor open error This is a cold condition Note If this failure reoccurs three times successively an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault see pg 6 20 is performed Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Fuser m Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Turn OFF power and remove the Fuser Go to step 2 Replace
122. 1103 20 20 0 001929 NOLIVH3N39 04 20 51 uvowno 524 99188114 TINON woo 20 ec h gt 6 4 O m er TW 1 on gr i NO HaMOd AUD AUD TA 1 T OL TE NO 8 TA 907 504 009 9014 907 TY ae Sani Ave 01 HOLO3NNOD 1081402 woo 2d ub NOW 1 t cem ii m ooer HO r 1 OL 553 et sosr 90169 od TIAVNG 54111925 14408 83 04 20183111 01 0 MOT AvZ Phaser 7750 Printer Service Manual 10 36 Power Interlock Switching 196 06 035185 HOLIMS v N 6 AWD 90188 007 amod 01 01 038138 9L 0 390 1831NI U3A02 H1 AY9 AUD 189 AYO AB rm 11 1917 E TA 40 2 el 114 0 035010 899 amd A Wnua 1 X90 T3INI WNYG Aejay
123. 188 805188 32 83911811 001 100 07100 019d nano TA 4 7 0197 8907 994 9114 218100 angu 2 91109088 181 0 00188205 881011 89288 Jaded SMOYS 0118 9 208186 826 18084 ISIN 0 99004888 0 01 0089 100 8080 0 011010228 098088 1 101091 ULIG 1594 828 Jade 0 109185 115 83411 8314 030101 01930 900 0197 1 8 19100 3101 TA P UM XMC m S 18 ltd ONINOWLS 8341 1161 10 53 Paper Feeding 982 08 350118 1 81 3399 03417 AVUL t m NN m 0334 PAVEL 81 U3dvd 039915 6 ZL 3394 0346 AVULL JAG 0334 91 GHZ 03504182 fe EN Mm ni INYO 94 4 4 4 4 amavas 1 92 N 3399 033 AVYL 03341 81 330916 8 61 3394 03419 AVYL 03346 AA aol 202 woo 98 5 gj iee Wig 9 21901 6 6124 019 0194 20 72 1 NO 01974 703109 GIONT10S ond ond 17 veld 318000
124. 1H9I3H 39915 9114 1H9I3H 39 15 1 1 t 1 TA Ls 2 HRH 11915 038138 038148 u3dvd 81 87 vier 698r AID jeg get YOSNSS YOSNAS u3dvd HOLS ond 698 8 _ ater ovis 002 1 0620 318000 318000 9 2114 HOSNAS 2915 73A 6 035436 08302018 8018 voler 8987 AD 805135 HOSNAS 1H9I3H 30 16 Sm 8987 voer 80 87 1H9I3H 32 15 2 AG t0z zH 06690 318100 9714 U3HSINH W3HSINIJ Z 40 1 108109 H3OVIS 0121 Phaser 7750 Printer Service Manual 11 40 Stacker Tray Control cont d 2 8 0G22 YOSNAS 8 JOVIS YOSNAS HOWLS YOSNAS Y3ddN 1401 530014 NO 59 1929 440 9 qejreAeun 43881594 33S 81 01 08 008 33S 816845 00011910 NO 310 2258 810915 0001 005 NO 08 005 055 519945 006 008 HO NO 08 008 338 81 88 518945 Q0 0 310 380 05 0001 33S 11 88 30536 8 HOSN3S V 5 235008 Ayoedeg OWLS OWLS 385 48 9 9 05 005 335 ev play 0 818848 Jaded Jo 10 y 05 005 295 v8 satis 108096 8 086 pue 108098 v AMIS Jo uoneuiquioo
125. 2 05 0001 335 338 88 3358 335 9v 335 98 33S p129 1804 05 0001 331991 05 0001 331 1 88 08 0001 ATV 05 0001 39159 38197 16 19 Ab saded 9215 saded 34 ploy 1949816 0 1 BA 2 Es 7 wNBIS 35435 0370018 98 81721 yosnas 8 013 38 8 401 1 602 21 06620 gi 987 051135 8 991 2 5 048148 832018 coer 91 yosnas Y 5 YOSNAS MOVLS OIA 192 211 06620 8987 2 HOSNAS XOVLS 1 1 THA WNOIS 035 35 088 9QAS 035835 298 get 808838 HOSNAS H3ddn 2 202 21 06620 9 8 5 38 d3ddn 40 1041109 4391 80121 19137 W3HSINIH 11 41 Finisher Service Parts List PL 17 1 Finisher 1 PL17 2 4 1 2Pcs 5 PL17 14 87700 369 11 42 Phaser 7750 Printer Service Manual Finisher PL 17 1 No Part Number Qty Description 1 116 1292 00 1 Gate Cover 2 116 1280 01 1 H Transport Assembly 3 Staple Finisher 4 116 1821 00 Thumbscrew 5 Rack Assem
126. 2 1 Measure the resistance between fuser Go to step 3 Replace the fuser connector P600 3 and P600 12 assembly 2 Doesthe resistance measure 20 Ohms or less 3 1 Reinstall the fuser assembly Go to step 5 Go to step 4 2 Enter service diagnostics 3 From the Sensor Tests run the Fuser Temperature test 4 15 the temperature indicated approximately 165 C 4 1 Turn printer power OFF Replace the Repair or replace 2 Check for an open circuit or poor engine control the wiring connection between J641 4 and board harness J641 5 3 Isthe wiring harness OK Error Messages and Codes 3 31 Troubleshooting Procedure Continued Step Actions and Questions Yes No 5 1 Is line voltage present at FS47 on the Go to step 6 Go to step 7 AC drive board 6 1 Check the wiring harness between Replace the fuser Replace the AC FS47 and J600 1 for an open circuit or assembly power chassis poor connection assembly 2 Is the wiring harness OK 7 1 Check for 5 VDC at P J 590 3 on the Go to step 8 Replace the AC drive board engine control board 8 1 Check for 24 VDC at P J 590 1 onthe Replace the AC Replace the fuser AC drive board power chassis assembly assembly 3 32 Phaser 7750 Printer Service Manual Fan Failure Code 48 The machine logic detected a failure of the Fuser fan LVPS fan or rear fan Troubleshooting References Applicable Parts Wiring and Plug Jack Map Referen
127. 26 0334335 18101 Hold 026 01388345 nia 1 35 313 010 310 HOSN3S 20 8 001 620 600 00 20 ns 20 2 ma 01043105 805435 20 8001 180 600 006 2d ales Fs woo 0d 2 4 2 5 gesr 2094 209 vrir EUH ES NN ma 955 0393 1614 HOSNAS 20V 002600 0100 NOW 20 89 1 NO 1 031 808188 20 7 20 6001 00890 Ge zogr 5099 OOAS UNO T 031 HOSN3S 20 970 600 008 20 roH m 318100 Verd YOSNIS 20 amd now 1 918838 LN3UIOHIAN3 ONY 20 91 6 10 69 808 0522 pads ajqnop 1610 8001 06804 pue paads yey ye 210 00 0899 paads je 82101 0 101081 181 50012 1200 8001 06220 18 dn 2030 18 uo 1200 8001 005804 uo 810490 Assy 18 dn ur 9 10 paads ye pue aded 10 paads ye saaug 0 ALON Inya 826 10 181 Accumulator Belt Assembly Drive Control 30019 201925 NO HOLOW 181 1200 7001 06690 2
128. 318000 JA NIN 910114 d3dVd S L L8 Phaser 7750 Printer Service Manual 10 54 Paper Transportation 187 0922 O BA ela 2 5 035435 gane e H 035019 805135 50018311 805185 30018311 33 09 83 01 1 2068 Y34009 9 205 1001 06690 Ezd eld 805485 00183111 amd non 83 02 83 01 1 034 JINON A wav AVL 10 55 1109 34 ma 81244 Saves 1 5 4 2114 leer Homo 91114 SVL Leld veld AVI 318000 00 860 800 06690 NOW THA 20181 gg 98 HA 2 915 039435 m gear OGAS H 604 eer 08 08138 110 038138 HOSNAS 9114 TA 0324 100 0384 1 AVL 318100 10220 9 rer ez NOW E 110 0333 318000 1 1 1 L NOLLWLYOdSNWUL H3dVd 101 8 Tray Module Paper Transportation
129. 359 Tray 1 1 of 2 PL 2 12 No Part number Qty Part Description and part name 1 116 1763 00 Tray 1 MPT FEEDER ASSY MSI 9 16 Phaser 7750 Printer Service Manual Part List 2 13 Tray 1 2 of 2 PL2 13 9 10 11 13 14 16 12 13 17 18 11 13 16 5 PL2 15 87750 360 Tray 1 PL 2 13 No Part number Qty Part Description and part name 5 116 1763 00 Tray 1 MPT Extension Service Parts Lists 9 17 Part List 2 14 Tray 1 Feed Assembly PL2 14 14 15 18 Tray 1 Feed Assembly PL 2 14 57750 361 Part number Qty Part Description and part name 14 116 1765 00 Feed Roller Assembly ROLLER ASSY FEED 15 116 1820 00 2 Feed Roller Kit 19 116 1166 00 Retard Pad PAD ASSY RETARD 22 116 1766 00 Spring Middle 24 116 1767 00 Spring Front and Rear Phaser 7750 Printer Service Manual Part List 3 1 Laser ROS Assembly PL3 1 FL 3 87750 3 Laser ROS Assembly PL 3 1 No Part number Qty Part Description and part name 2 116 1768 00 Laser Assembly ROS ASSEMBLY Service Parts Lists 9 19 Part List 4 1 Xerographic Module 1 of 2 PL4 1 3 4 6 11 12 8 9 10 13 14 57750 364 Xerographic Module 1 of 2 PL 4 1 No Part number Qty Part Description and part name 2 108 005 75 Waste Toner Cartridge 3 116 1138 00 Sensor Holder Assembly HOLDER ASSY SNS 7 1
130. 38 sos E sos asr j 90 bela 43844505 NIN 8Md NOW ASSY 508 OOTYILNI YOOTYILNI 20185 50 7 153810 ON AYO n 11830038 INIT QUVZVH 38 1 X90 1831NI 20AS W099 1 0920 A 1530038 30 4 177 t OA T 818 woo 2d woo 20 At 30010 03011 90189 1 NO 177 7104109 i 1102 30019 omo 1 OAWLYG O3GIA a y 1041902 34010 8351 A 838 1 i E ely 03110001 a IVN9IS YIMOd 3010 u3sv1 A VIVO 03011 471 03011 A viva 03011 9A VIVO 03011 95 A 0301A BA 0884 0301 veld ASSY 508 Feld NOW Feld 8Md 553 TWNOIS 114 2019 10841102 508 lt 210 1 A 25 10814102 93811 9 Phaser 7750 Printer Service Manual 10 40 4201 198 1010 508 1081 01109 9808 001801 50110 0019 008008 NIN uo 1104 1681 10 41 Laser Scan Drive Control jo 0 91081 01 10220 EE EE NM EN NN NN NN EM NOD 10d NuO Jara 18 1 0 390710 338 TT HOLOW 908 1 1090 660 NS zon
131. 4 1HM JHM 1HM m pen on HOW NI 9114 9 54 uni 7 54 NOWNI n8 3SION PM HOW NI 9114 1153 6 83 zr CTW 301931034 10080 1HM Z61d U3yv3u8 149 LNO MSd 01 our NI 9fr1d x18 yg eee yg CUNO MSd OD ost Et HOW NI 9114 ya ya x 01 2981 1954 0654 d HOW NO Md 3SION V IN lt 2614 9aArz NO vor 8Md 9014 9 Aviad 378000 10 31 Main Power 2 of 2 695 0544 3055399 01 HOW NO AYOSS399V 01 HOW NO gee 131100 HOW NO 131100 01 HOW NO 18411 2 01 HOW NO 1 01 HOW LHM L 01 9v 01 HOW NO HOW NI 9014 wee c 01 ya 9v OL Se Sant AS 01 HOW NO NO 8 AS 01 01 y HOW NO HOW NO AV 13H wee OL 081 HOW NO ov 2614 0D gar HOW NO 9v 2 40 NO NIYIN 8L 1 Phaser 7750 Printer Service Manual 10 32 LVPS Control 895 09 6L
132. 4 Replace the fuser Print Quality Troubleshooting 5 19 Repetitive Mark Appears on Each Print 3041 An identical mark or image appears on each or every other printed image From the front panel s Troubleshooting Menu select Print Quality Problems then select Remove Print Smears This function passes several blank sheets of paper through the printer to clean the fuser rollers From the front panel s Troubleshooting Menu select Print Quality Problems then select Repeating Defects Page The Repeating Defects Page contains rulers to help determine the source of the repeating defects 84 mm 3 3 in Fuser 94 mm 3 7 in Fuser mark in all colors or imaging unit mark in single color 88 mm 3 5 in Transfer roller 2nd bias 44 mm 1 7 in Imaging unit 28 3 mm 1 1 in Developer housing roller 5 20 Phaser 7750 Printer Service Manual Random Missing Spots There are small areas of the image that are extremely light or are missing entirely These missing areas form spots that are localized to small areas of the page The printer displays no error code A small number of occasional missing spots is normal 1 If a toner low message is displayed replace the toner cartridge in question Ensure that the loaded media matches the front panel settings Try using an approved media to see if the spots still appear Run the Calibrate for Paper routine From the front
133. 5 PAPER SIZE SENSOR BROKEN TTM 07 930 TRAY 2 PAPER SIZE MISMATCH 07 931 TRAY 3 PAPER SIZE MISMATCH 07 932 TRAY 4 PAPER SIZE MISMATCH 07 933 TRAY 5 PAPER SIZE MISMATCH 08 620 ENVIRONMENT TEMP SENSOR FAIL 08 900 STATIC JAM Paper Weight Equivalence Table US US Bond US text US US US US tag Metric Postcard Weight book cover Bristol Index weight weight thickness Ibs weight weight weight weight Ib g m mm Ib Ib Ib Ib 16 41 22 27 33 37 60 17 43 24 29 35 39 64 20 50b 28 34 42 46 75 21 54 30 36 44 49 80 24 60b 33 41 50 55 90 27 68 37 45 55 61 100 28 700 39 49 58 65 105 29 74 41 50 61 68 110 32 80b 44 55 67 74 120 36 90 50 62 75 83 135 0 18 39 100 55 67 82 91 148 40 101 55 68 83 92 150 0 20 43 110 60 74 90 100 163 45 115 63 77 94 104 170 0 23 47 119 65 80 97 108 176 51 128 70 86 105 117 190 53 134 74 90 110 122 199 54 137 75 93 113 125 203 58 146 80 98 120 133 216 65 165 90 111 135 150 244 A 12 Phaser 7750 Printer Service Manual Index Symbols Tray 3 removal 8 59 HCF Tray 4 and Paper Transport disassembly 8 59 24 VDC 1 of 2 wiring diagram 10 29 24 VDC Interlock Circuit troubleshooting 4 19 24VDC 2 of 2 wiring diagram 10 30 5 VDC Interlock Circuit troubleshooting 4 20 Numerics 1st Retract contact motor service diagnostics 4 9 24 VDC Low Voltage Power Supply
134. 5 are identical and can be interchanged On the DXF configuration not shown Trays 2 and 3 are identical and can be interchanged Trays 4 and 5 are the high capacity feeder paper trays 2 4 Phaser 7750 Printer Service Manual Paper Size Sensing Trays 2 through 5 automatically sense the standard size media loaded in the printer by using the paper size sensors mounted on the back inside of the printer When paper is loaded in the tray and the paper guides are adjusted the levers on the bottom of the trays change the size sensor actuator locations Actuating different combinations of the paper size sensors produces different combinations of high and low signals which tell the printer logic what size of paper to display on the front panel once the tray has been re inserted into the printer Tray presence is also detected by the paper size sensor Any actuation of the paper size sensor signals the tray is present Paper Feeding and Sensing Note The tray feed lift motor is a dual purpose motor providing both the paper feed and tray lift drive functions When the control logic calls for paper feed the pick roller moves a sheet of paper to the nip of the feed rollers and retard rollers The rollers feed the paper to the takeaway roller in the vertical transport where it is stopped and registered at the registration roller Registration Roll Registration Takeaway Roll 2 Sensor Feed Roller Tray 2 Feed Retard Roller t Out
135. 6 10 61 Charge and Exposure Y as an Example 962 09 Kjsnoeuejnuirs 0 10 0 pue S1004 uini q 010 40109 10 8818 1002 10 499 581009 920 600 07100 uo 02 10 Ag 90 pue 10 09 14 190 uo oy pue 20 SSN 2 wng peal 51 40 uorum 8 pue 10109 inj Jo D pue 108096 8126 995 04002 NOW vaamjaq 104 Aq pea1 anjeA 10928 e si ui NOW Uim jenas 2 94 41 5 4 Jo Ayjigedes au 11 10 ILIM YUM gt pue 01102 0 00 suuojied 8 44 104009 SdAH 9 310N A NO2I938 3 u3svi 899 A Hold TTA cannvos 899 0 6 1 4 xem T eH 859 016 A 499 INOZ Q3NNVOS 4351 m 91 1 03 310 926 HE NN ET A 15 926 waNvaT9 0 1 11244 ma nyo
136. 6 116 1785 00 Yellow Developer Beads Developer Y 7 116 1786 00 Magenta Developer Beads Developer M 8 116 1787 00 Cyan Developer Beads Developer C 9 28 Phaser 7750 Printer Service Manual Part List 7 1 Fuser Assembly PL7 1 Fuser Assembly PL 7 1 87750 374 No Part number Qty Part Description and part name 1 115 000 25 Fuser Assembly 110V 115 000 26 Fuser Assembly 220 Service Parts Lists 9 29 Part List 8 1 Air System PL8 1 87750 376 Air System PL 8 1 No Part number Qty Part Description and part name 1 116 1788 00 Laser Shutter Motor 4 116 1789 00 LH Lower Inner Cover COVER INNER L H LOW 6 116 1176 00 Fuser Fan Assembly FAN ASSY FUSER 8 116 1790 00 Laser Fan FAN ASSY ROS 9 116 1831 00 Developer Cooling Fan Not Shown Location Inside Rear Cover 10 116 1833 00 Bottom Fan Not Shown Location Underneath Power Supplies 9 30 Phaser 7750 Printer Service Manual Air System PL 8 1 No Part number Qty Part Description and part name 11 116 1834 00 Bottom Fan Duct Not Shown Location Underneath Power Supplies Service Parts Lists 9 31 Part List 9 1 Electrical Components 1 of 3 UR ei 8 vy 3 s 19 4 7 _ 57750 377 Phaser 7750 Printer Service M
137. 7 Replace in the engine control interface board and following order J533A 9 and frame ground engine control 2 Does the voltage measure 5 VDC interface board engine control board 7 1 Measure the voltage between the Replace in the The edge sensor engine control interface board and following order is defective J533A 10 and frame ground m engine control replace the 2 Does the voltage measure 5 VDC interface board accumulator belt engine control assembly board 8 1 Remove the accumulator belt Replace the Go to step 9 assembly accumulator belt 2 Enter service diagnostics and run the assembly Steering Motor test If the problem is 3 Does the motor turn unresolved replace the engine control board 9 1 Measure the voltage between the Go to step 10 Replace in the engine control interface board J550 5 following order and frame ground engine control 2 Is the voltage 24 VDC interface board engine control board 10 1 Measure the voltage between the Replace in the Replace the engine control interface board J550 following order steering drive Pins 1 2 3 4 and frame ground engine control assembly 2 the voltage 24 VDC interface board engine control board Error Messages and Codes 3 23 Unexpected Accumulator Belt Home Sensor Signal Code 33 Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Accumulator Belt Assembly Engine
138. 7750DXF Processor and Clock Rate Mhz G4 G4 G4 G4 715 715 715 715 Max Print Speed Letter A4 35 35 35 35 35 35 35 35 Maximum Memory GB 1 1 1 1 Memory Configuration MB 256 384 512 512 Resolutions dpi Base memory allows 1200 x 1200 dpi full clip path A3 image Post Script Fonts 137 137 137 137 PCL5c Fonts 81 81 81 81 Direct PDF 1 4 Support Std Std Std Std Job Pipelining Std Std Std Std Hard Drive Productivity Features N A Std Std Std Full Bleed Capability and Banner Size N A Std Std Std Printing Photo Mode N A Std Std Std Automatic 2 Sided Printing N A Std Std Std 1500 Sheet Lower Tray Deck Opt Opt Std N A 2500 Sheet High Capacity Feeder Opt Opt N A Std Ethernet Interface Networking N A 10 100 10 100 10 100 USB 2 0 Std Std Std Std Hard Drive Std Std Std Std Finisher N A Opt Opt Std PhaserMatch Version 3 0 Software N A Opt Std Std PhaserCal Software Opt Std Std Std Requires 7750B to 7750DN upgrade General Information 1 3 Parts of the Printer Exterior Front View 1 Face Down Tray 2 Front Door 3 Tray 1 MPT 4 2500 Sheet High Capacity Feeder 1500 Sheet Lower Tray Deck not shown 5 Power Switch 7750 445 Finisher Top Door H Release Finisher Output Tray Finisher Door J Front Door right side release release on left side not shown Phaser 7750 Printer Service Manual Exterior Rear View 1 USB Connection 2 Ethernet 10 100 Base T
139. 88 Lower Trays 3 4 5 Assembly PL 16 1 No Part number Qty Part Description and part name 2 119 6504 00 Tray 3 7 116 1090 00 Tray 4 8 116 1089 00 Tray 5 9 116 1126 00 Tray 3 Paper Size Switch 10 116 1127 00 Tray 4 5 Paper Size Switch 9 42 Phaser 7750 Printer Service Manual Part List 16 5 Lower Trays Paper Feeder 1 of 2 87750 392 Lower Trays Paper Feeder 1 of 2 PL 16 5 No Part number Qty Part Description and part name 4 116 1838 00 Tray 5 Transport Assembly 16 116 1816 00 Tray 5 Feeder 19 116 1218 00 Tray 5 Feed out Sensor 20 116 1169 00 Upper Chute 21 116 1168 00 Lower Chute Service Parts Lists 9 43 Part List 16 6 Lower Trays Paper Feeder 2 of 2 PL16 6 8 9 12 6 PL16 9 PL16 10 87750 393 Lower Trays Paper Feeder 2 of 2 PL 16 6 No Part number Qty Part Description and part name 1 116 1815 00 Takeaway Roller 8 116 1173 00 Chute Assembly 12 Chute 13 116 1167 00 Lower Chute 9 44 Phaser 7750 Printer Service Manual Part List 16 13 Left Cover Assembly LTD PL16 13 87750 400 Left Cover Assembly LTA PL 16 13 No Part number Qty Part Description and part name 1 116 1185 00 Left Cover Assembly Service Parts Lists 9 45 Part List 16 14 Tray 4 5 Lift Gear Assembly PL16 14 57750 401
140. 9 6694 30019 207 2 NO E 18 LSL 0 193133 550 600 06820 61 LOVLNOS 60 600 0890 NIN 047 794 YOLOW 9014 90114 AOWYLIY 318100 318000 318100 319 151 LOWHLAY 199109 819 151 81 6 10 71 itioning Accumulator Belt Assembly Pos oun penu 6 OLE 0S22 yosuas 191 pue sosuas 181 0 49405 90468 0 SL oa 9 YMS xoopiaqu 1004 YM uo SUNL 1 915 03838 5 03838 15 038838 3NOZ VI 6 yosnas 390318 808435 3909 191 309438 3903 181 610005 oxojaq ot 1001 00 0120 1001 8001 08694 511086 10 586101 ma n m 019913 181 uo suuni 600 700 06620 321 gyt izy 29 2 Durddojs 910490 5 019 10 5 09835 035435 6694 6690 5094 aasnas 3NOZ 88101 1 0001 YOSNAS MWOH 181 ave 91114 0193
141. Assembly KIT IBT UNIT OPB 7 116 1180 00 Waste Toner Auger Assembly AUGER ASSY 10 108 005 80 Accumulator Belt Cleaner Assembly 9 24 Phaser 7750 Printer Service Manual Part List 5 6 Accumulator Belt Elevator 87750 371 Accumulator Belt Elevator PL 5 6 No Part number Qty Part Description and part name 4 116 1777 00 Accumulator Belt Elevator IBT ELEVATOR FRAME includes items 1 4 Service Parts Lists 9 25 Part List 6 1 Developer Unit 1 of 2 12 1 3 87750 372 Phaser 7750 Printer Service Manual 9 26 Developer Unit 1 of 2 PL 6 1 No Part number Qty Part Description and part name 1 116 1778 00 Yellow Toner Dispenser DISP ASSY Y 2 106 006 51 Yellow Toner Cartridge 3 116 1779 00 Magenta Toner Dispenser DISP ASSY M 4 106 006 50 Magenta Toner Cartridge 5 116 1780 00 Cyan Toner Dispenser DISP ASSY C 6 106 006 49 Cyan Toner Cartridge 7 116 1781 00 Black Toner Dispenser DISP ASSY 8 106 006 48 Black Toner Cartridge 9 116 1782 00 Toner Dispenser Base Assembly BASE ASSY DISP Service Parts Lists 9 27 Part List 6 2 Developer Unit 2 of 2 PL6 2 2 1 2 4 87750 373 Developer Unit 2 of 2 PL 6 2 No Part number Qty Part Description and part name 1 116 1783 00 Developer Housing HSG ASSY DEVE 5 116 1784 00 Black Developer Beads Developer
142. Clear Tech Rep Fault see pg 6 20 is performed If this error is intermittant replace the black developer clutch Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m ATC Sensor and Harness m Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 Is the black toner and or developer empty Replace the toner Go to step 2 or developer 2 Is the ATC sensor clean and free of dust Go to step 3 Clean the ATC toner or any other contaminates sensor 3 1 Check the ATC sensor wiring harness Replace the ATC Go to step 4 P J132 Sensor and or 2 15 the wiring harness or the sensor wiring harness defective 4 1 Remove the rear cover and rear shield Go to step 5 Replace the 2 Measure the voltage at P405A3 on the engine control engine control board board 3 15 the voltage between 1 and 3 VDC 5 1 Measure the voltage at P405A4 on the Go to step 6 Replace the engine control board engine control 2 Is the voltage 5 VDC board 6 1 Measure the voltage at P405A2 on the Go to step 7 Replace the engine control board engine control 2 15 the voltage 0 VDC board Error Messages and Codes 3 15 Troubleshooting Procedure Continued Step Actions and Questions Yes No 7 1 Remove the imaging unit plate cover Replace the wiring Replace the ATC 2 Inspect the wiring harness between harness sensor the engine
143. Code 81 3 39 Engine Logic Board RAM ROM Failure Code 82 3 39 xiv Phaser 7750 Printer Engine Logic Board NVRAM Failure Code 83 3 40 Controller to Engine Logic Board Time Failure Code 84 3 40 Engine Logic Board Micro Pitch Failure Code 85 3 40 High Voltage Power Supply Failure Code 86 3 40 Tray Lift Failure 87 3 41 Tray 1 MPT Size Sensor 7 274 3 43 Lower Tray Communication Failure Code 88 3 44 Reflective Sensor Procedure 3 45 Transmissive Sensor 3 46 Finisher Stapler Move Sensor On Failure Code 111 Finisher Stapler Move Sensor Off Failure Code 112 3 47 Finisher Stapler Failure 06113 3 49 Front Tamper Home Sensor Failure Code 114 3 51 Rear Tamper Home Sensor Failure Code 115 3 52 Finisher Stacker Height Sensor Off Failure Code 116 3 53 Finisher Stacker Tray Failure Code 117 3 55 Finisher Stapler Front Corner On Failure Code 118 Finisher Stapler Front Corner Off Failure Code 119 3 57 Finisher Eject Clamp Home Sensor On Failure Code 120 Finisher Eject Clamp Home Sensor Off Failure Code 121 3 58 Finisher Decurler Failure Code 122 3 59 Finisher Set Clamp Failure Code 123
144. Color Is Faded or Missing 3041 39 Under high toner coverage conditions toner may be depleted during the toner low state but before the toner out message is displayed Is the toner low or near empty Remove the toner cartridge and inspect the top of the feed tube Replace the toner cartridge if necessary Ensure that genuine Xerox toner is installed Run the Calibrate for Paper routine Check the transfer setting before running calibrate paper If the value is 4 you need to adjust the transfer settings Remove the imaging unit and verify that the laser shutter opens and closes using the Service Diagnostics Shutter Solenoid test Inspect and test the toner auger system Ensure that the toner auger motor operates Ensure that the toner dispense assembly is carrying toner from the toner cartridge to the developer Remove the accumulator belt assembly and inspect the high voltage connectors on the back side to ensure they are not damaged Inspect the high voltage wiring leading to the accumulator belt assembly for damage Verify that the developer is seated properly 10 Replace the developer beads 11 If the missing or faded primary color appears as speckle on the entire page the high voltage wire leading to that color s developer housing is grounded Inspect the high voltage wiring harness and power supply Repair replace as necessary
145. Control Interface Board m Engine Control Board Caution If the Accumulator Belt is damaged determine the cause of the damage before installing a new assembly Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Remove the accumulator belt Replace the Go to step 2 assembly accumulator belt 2 Inspect the DTS connector for assembly damage 3 Is the connector damaged 2 1 Isthe mating connector inside the Repair or replace Go to step 3 printer damaged the wiring harness between J605 and the connector 3 1 Reinstall the accumulator belt Use the Replace in the assembly Reflective Sensor following order 2 Enter service diagnostics and run the Procedure on m engine control Accum MOB Sensor test page 3 45 interface board 3 Is the value H when the belt home m engine control marker is NOT under the belt home sensor board 3 24 Phaser 7750 Printer Service Manual Fuser Main Lamp Failure Code 35 The lamp control circuit has failed resulting in the front thermistor detecting an overheat condition Note If this failure reoccurs three times successively an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault see pg 6 20 is performed Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Fuser Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No
146. D activity on the printer The green link LED is ON whenever it is connected to an active network The amber traffic LED is flickering when data is being received 1 Verify the following The cable connections Use a new cable or connectors if possible Which port your printer is attached to Connect a functioning network device to your printer to test the port 2 Print the Configuration Page from your printer For information about printing Configuration pages go to Reference Features Front Panel 3 Review the Connectivity Settings and verify these items NetWare is enabled Frame Type matches the frame type of the desired file server Note To determine your NetWare IPX frame type type config at the Novell console screen On large networks using multiple IPX frame types it is critical that the frame type be set correctly PDL is set to your desired PDL PostScript or PCL or to Auto Primary Server for NetWare 3 x only is set to the name of the server which serves the print queue you have assigned to the Phaser printer NDS Tree for NetWare 4 x NDS and later is set for the correct NDS tree name NDS Context for NetWare 4 x NDS and later is set for the correct NDS Context Print Server PServer Name is set for the name selected for the Phaser printer to act as a print server Novell Mode is correctly set If changes are made reset the printer Once the printer has been reset allow approximately t
147. F printer power and disconnect the AC power cord from the wall outlet Verify the power cord is free from damage and is connected properly Remove the Imaging Units and protect them from light Clean and inspect the printer interior and remove any foreign objects dust or loose toner Note Use only a Toner Type Vacuum Do not use solvents or chemical cleaners Do not use any type of oil or lubricant on printer parts Do not use compressed air Clean all rubber rollers with a lint free cloth dampened slightly with cold water and mild detergent Inspect the interior of the printer for damaged wires loose connections toner leakage and damaged or obviously worn parts Step 3 Find the Cause of the Problem 1 Use the Error Messages and Codes troubleshooting procedures to find the cause of the problem if an error code is reported Use Service Diagnostics to check printer parts Use the Wiring Diagrams and Plug Jack Locator to locate test points and to take voltage readings at various test points as instructed in the appropriate Troubleshooting procedure Step 4 Correct the Problem 1 2 Use the Parts List to locate a part number Use the Removal and Replacement procedures to replace the part Step 5 Final Check 1 2 Test the printer to be sure you have corrected the initial problem and there are additional problems present Perform RIP procedures Error Messages and Codes 3 3 Serv
148. Failure Code 121 Error Code 120 The Eject Clamp Home Sensor did not turn ON within 5 seconds after the Eject Clamp Up was started Error Code 121 The Eject Clamp Home Sensor did not turn OFF within 2 seconds after the Eject Clamp Down was started Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Eject Motor m Finisher Control Board Step Actions and Questions Yes No 1 1 Remove the Set Clamp Home Sensor Go to step 2 Use the Bracket from the Finisher while leaving transmissive the connector plugged in Sensor procedure 2 Check the Set Clamp home sensor in to diagnose and diagnostics repair the sensor 3 Does the value change from H to L while blocking and unblocking the sensor 2 1 Reinstall the sensor in the Finisher Replace the Go to step 3 And turn the printer on finisher control 2 15 the eject clamp up board 3 1 Run the Eject Release Test in Diagnose and Go to step 4 diagnostics repair the 2 Does the Eject Motor Run mechanical problem with the eject clamp assembly 4 1 15 24 VDC present at P846 12 Replace the Go to step 5 eject motor 5 1 15 24 VDC present at test point 9 on Replace the Troubleshoot and the finisher control board finisher control repair the board 24 VDC interlock circuit 3 58 Phaser 7750 Printer Service Manual Finisher Decurler Failure Code 122 The level of the Decurler Cam Home Sensor did not change 4
149. Fault History Built in Test Prints Prints Test Prints The prints are used by service personnel to identify repair and validate the operability of the printer Paper Path Options Print Laser Check Print HalfTones Print Grid 1 Dot Print Fast Scan 8 tone Sensor Switch Tests Test the functionality of sensors and switches by giving service personnel the ability to input actuation and state changes of all sensors and switches Ambient Temp Humidity Fuser Temperature Interlocks Jam Sensors POB Sensor Registration Sensor OHP Sensor Duplex Sensor Tray Feed Sensors Stack Full Sensor Fuser Exit Sensor 1st BTR Retract Sensor 2nd BTR Retract Sensor Fuser Present Read Fuser Fuses Accum MOB Sensor Belt Edge Sensor BTR Sensors ADC Sensor Toner Waste Cartridge Tray Sensors Tray 1 Sensors ATC Sensors Imaging Unit Sensors New Toner Cartridge Sensors Finisher Sensors optional Motors Fans Tests Tests the functionality of motors and fans by giving service personnel the ability to energize de energize the motor and fans one at a time Main Motor Steering Motor Imaging Unit Motors Accumulator Belt Motor Motor Test cont d 1st BTR Motor A 4 2nd BTR Motor Duplex Motor Paper Feed Motors Paper Lift Motors Offset Motor Developer Motors Dispenser Motors Agitator Motor Fan Motors Paper Path No Pick Finisher Motors optional Clutch Tests Tests the functionality of the clutches by giving service person
150. Fuser to cool before you attempt to service the Fuser Assembly or adjacent components Phaser 7750 Color Laser Printer Regulatory Specifications United States The equipment described in this manual generates and uses radio frequency energy If it is not installed properly in strict accordance with Xerox instructions it may cause interference with radio and television reception or may not function properly due to interference from another device However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures W Reorient or relocate the receiver device being interfered with Increase the separation between the printer and the receiver Connect the printer into an outlet on a circuit different from that which the receiver is connected Route the interface cables on the printer away from the receiver Consult the dealer Xerox service or an experienced radio television technician for help Changes or modifications not expressly approved by Xerox can affect the emission and immunity compliance and could void the user s authority to operate this product To ensure compliance use shielded interface cables A shielded parallel cable can be purchased
151. Halftones Selecting Print Halftones causes a group of six pages to print that consist of 80 solid fill on individual pages of CMYK for primary colors and RG for secondary Colors should be uniform from top to bottom of the page with no mottling and the density for each color should be approximately equal E 7750 185 Print Grid 1 Dot Prints a square grid over the complete sheet of paper Squares should be uniform and vertical and horizontal lines should be straight and of uniform thickness All colors should align 7750 186 5 10 Phaser 7750 Printer Service Manual Print Fast Scan 8 Tone Prints one sheet each of YMCK six distinct graduated bands of the color forming a block in the center of the page and a seventh band with density that falls between the two lightest in the block located at the bottom of the page The variation between bands should be distinct and the color in each band should be uniform 7750 187 Print Quality Troubleshooting 5 11 Initial Actions Before troubleshooting any Print Quality Problems W Print a Paper Tips Page to verify the media being used is supported by the printer and the tray being used Verify the media settings are correct in both the printer drive
152. Highlight Reset NVRAM and press OK 4 Highlight Reset Engine NVRAM NOW and press OK Adjustments and Calibrations 6 17 Resetting Paper Handling Defaults Resetting the paper handling defaults resets the paper source paper destination job offset stapling options print quality mode 2 sided printing image smoothing and TekColor corrections to their default values 1 From the Main Menu highlight Printer Setup and press OK 2 Highlight Paper Handling Setup and press OK 3 Highlight Reset Paper Handling Setup and press OK 4 Highlight Reset Paper Handling Setup NOW and press OK to reset the paper handling defaults Resetting Network Setup Values to Default Resetting the network setup values resets the TCP IP address TCP IP address menu settings gateway broadcast etc CentreWare IS EtherTalk NetWare set IPX frame type IPP and Ethernet speed to their default values 1 From the Main Menu highlight Printer Setup and press OK 2 Highlight Connection Setup and press OK 3 Highlight Reset Connection Setup and press OK 4 Reset Connection Setup NOW is displayed press OK Resetting Belt Cleaner Assembly Life Resetting the belt cleaner life is to be performed only if the belt cleaner assembly is replaced before an end of life or near end of life message Do not to extend the life of the assembly Doing so may cause premature failure of other internal printer components The printer prompts the user to reset the
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154. In some cases switching the paper type setting for example from Heavy Laser Paper to Thin cover Index may improve print quality Run fuser cleaning pages After the fuser has been cleaned try setting the paper selection one type heavier that part 5 24 3041 52 If the transfer roller or belt cleaner assembly is near the end of its life replace Phaser 7750 Printer Service Manual Print 15 Mottled The printed image has a mottled appearance 1 Ensure that the paper is in good condition and appropriate for a laser printer 2 Ensure that the loaded media matches the front panel settings Also check the media selected in the printer driver 3 Ensure supported media is being used 4 For specialty papers experiment with alternate paper type settings such as Heavy Laser Paper Thick Cover Index or others 5 Run the Calibrate for Paper routine From the front panel s Printer Setup Menu select Calibration Setup then select Calibrate for Paper 3041 53 Note Verify the settings Be sure the setting is not at 4 value before running Calibrate for Paper 1 must have the right setting to run calibrate for paper Print Quality Troubleshooting 5 25 Image Mis Registered on Paper The image area is not centered on the page or the image is bleeding off of the page The printer displays no error code 1 Run the Configuration Page or Star
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156. Left Cover Assembly LTA PL 16 14 No Part number Qty Part Description and part name 2 116 1171 00 Gear Assembly Tray 4 3 116 1170 00 Gear Assembly Tray 5 9 46 Phaser 7750 Printer Service Manual Part List 16 15 Electrical Components and Caster PL16 15 BJ BJ 9 87750 402 Electrical Components LTA PL 16 15 No Part number Qty Part Description and part name 4 116 1099 00 Takeaway Motor 2 5 116 1814 00 Takeaway Motor 1 12 116 1818 00 Tray Module Control Board Service Parts Lists 9 47 Part List 16 16 Lower Tray Deck 7750 472 Lower Tray Deck PL 16 16 No Part number Qty Part Description and part name 1 116 1814 00 Tray 3 Module Motor Assembly MOTOR ASSY 3TM 2 116 1813 00 LTD Circuit control Board TRAY MODULE PWB 3 116 1206 00 Caster Locking CASTER ASSY S 4 116 1221 00 Caster CASTER ASSY 5 Paper Select Switch 6 116 1184 00 LTD Module Cover COVER ASSY LH 3TM NOT SHOWN 9 48 Phaser 7750 Printer Service Manual Hardware Kits Parts Part number Qty and description vendor description 116 1912 00 Sensor Kit 116 1210 00 Sensor Flag Kit 116 1211 00 Roller Kit 116 1820 00 Tray 1 MPT Roller Kit 116 1300 00 Hardware Kit 065 0630 00 1 Complete Repackaging kit 065 0629 00 1 Internal repackaging kit Recommended Service Tools The followi
157. Magnification gt 57700 462 Adjustments and Calibrations 6 3 Center Skew Adjustment The Center Skew Adjustment Magnification Balance adjusts the linearity of the scan lines During RegiCon 3 the printer measures a specific midpoint of each scan line and adjusts it to a horizontal reference midpoint Figure 4 Magnification Balance 57700 463 6 4 Phaser 7750 Printer Service Manual RegiCon Adjustment Procedures Note For the following procedures you must perform certain steps prior to during and after the tests are run The following information is vital to the process and must be followed in order for each procedure to function properly W RegiCon fails if there are any print quality problems Diagnose and repair any print quality problems before running any RegiCon procedure To resolve a print quality problem see Print Quality Troubleshooting on page 5 1 You must enter the Hidden Service Menu from the Troubleshooting Service Tools Menu to perform each test Go to the front panel Troubleshooting Service Tools Printer Status Page menu and press and hold the Up button then press the Down button This will display the Hidden Service menu Then scroll to RegiCon Setup Cycle and press Enter to display the RegiCon test menu W The procedures are listed in the order they need to be performed for optimal adjustments Troubleshooting Procedure Step Actions and
158. Mis Pick 1 Check that the correct type of media is being used 2 Try loading paper from a fresh ream or flip the paper over 3 Clean the pick rollers with a clean dry lint free wipe 4 Troubleshoot the pick roller assembly Damaged Prints The printed page exits either wrinkled creased or torn The printer neither jams nor displays an error code 1 Stop the paper in the paper path to determine where the media becomes damaged General Troubleshooting 4 21 2 Feed paper through the printer from each of the available trays including Tray 1 MPT Is the paper damaged when fed out of one tray but not when fed out of the others If so inspect the tray for damage ensure that the media guides are set correctly and verify that the proper media is being used Inspect the paper feeders for debris or broken components The following components are associated with this specific problem One or more of these components may have failed partially or completely If you cannot isolate the problem replace each component listed below one at a time until the problem disappears Fuser m Accumulator Belt usually appears with toner in creases or wrinkles Fuser Jams O O AF WN ot Is the paper in good condition and appropriate for a laser printer Is Phaser 45 Series Transparency Film being used Is the printer operating within its environmental specifications Ensure that the loaded media
159. N Scrolls down one menu item within a menu list This control does not wrap The end of a menu list is designated by three asterisks Used to decrement data in tests requiring user input OK Enters the highlighted menu Executes the current test item Used to select a data value entered by the user Service Diagnostic Tests Table Test Front Panel Display Test Operation Definition Print Service Menu Map Prints the Service Diagnostics Menu Page General Status Provides current print engine status Engine ROM Version Engine Version is xxx x x Displays engine ROM version Video ASIC Version x xx Configuration Options 1TM 3TM HCF Displays all optional components Duplexer nnn Finisher installed Ambient Temp Temperature is Displays current printer Humidity Humidity is XX temperature and humidity Fuser Temperature Front Temp is XXX Displays current fuser temperature Back Temp is XXX C Fault List No Faults Detected lt gt Power up only current static Fault Text condition not a history log Front Panel Adjust Adjust Contrast Adjust Value 1 15 8 Default Yes lt Press UP Down to Adjust gt No lt Press OK to accept new value Backlight On and exit gt Yes No General Troubleshooting 4 3 Test Front Panel Display Test Operation Definition Jam Info No Static Jam Detected or Static Jam area name Lo
160. NERGY STAR timeout to their default values 1 2 3 OOR From the Main Menu highlight Troubleshooting and press OK Highlight Service Tools and press OK Press the Up and Down buttons simultaneously to enter the Hidden Service menu Highlight Run Service Diagnostics and press OK to enter Service Diagnostics Highlight NVRAM Access and press OK Highlight PostScript NVRAM Reset and press OK Select the specific entry desired Yes or No and press OK The printer now exits Service Diagnostics and reboots While booting NVRAM is reset Adjustments and Calibrations 6 19 Clear Tech Rep Faults The following printer faults can occur during normal operation and the normal procedure is to isolate and repair the problem However with these particular faults an additional step is required A value has been written in the engine NVRAM that requires clearing before the printer can be used Some faults require three occurrences before the fault is generated Note To clear a Tech Rep Fault you must disconnect the Finisher option The following functions generate a Tech Rep Fault Error Chain Link Belt Home Too Long Error 30 04 346 ATC YMCK Sensor Fail Errors 12 13 14 15 09 380 thru 09 383 ADC Sensor Fail Errors 09 645 Imaging Unit YMCK Type Mismatch 09 910 thru 09 913 Fuser Main Sub Lamp Temp Too High Errors 35 44 10 348 10 350 1 From the Main Menu highlight Troubleshooting
161. NIW TWNOIS 2 Houms 9 12 101 853 10410 2 10 33 DC Power Generation 3 3 VDC 795 09 110 Jamod Jaye 295 09 UO 19 81910991 110400 au 710 110 si 110110 ayy 6 Sayoea 100100 4q 66 uauw 101991044 9 9 0 1404 94 191099 19 295 Q 519 0991 01 9 110110 au sdooup 110400 ay pauous si 11210 9 Ae e UUM 401281014 1u811n318AQ 101991044 1191 12049 amd NOW uuu D LON A851 999 899f 9 69 4 TINTON KINO 4 WLIVOWLE YOSNAS 3715 Ty euet OL LAVUL 20668 IVd3N39 HOW NO H3MOd u3M0d 111 080838 3215 ISN 201 FIAC 20 64 1 01 20 1 NO 83M0d 1614 14144085 83 04 8Md NOW 8Md 553 FOVLION 141915 118813 NOW 001676 NOLWHINID YIMOd 611 Phaser 7750 Printer Service Manual 10 34 DC Power Generation 5 VDC 690 06 jo Jaye 29509 uo Jamod s18 0281 104100 102 51110400 00 8 9 Indyno JA Ag 10991014 7105 aug 19A0391 Jaye 9950 519 0281 0 yn
162. NN02 e Ep ial Burddojs aJojaq ease 80 1010 ayy 2018 001 700 08894 nanoa 001 0001 02800 5 1085 10 88 2 0 1010 veld 1614 6411924 181 uo suum 100 00 0890 vaum LON 1 20169 H 90 TA z4 68 HOSNAS 181 INOZ eur om 10 700 06690 ma IWNOIS 035185 div E ina 18 91 out 001 001 09190 805435 3903 181 XA 9 oma ma A i 118 16 rm YOSNIS 181 1 otera Sans H 035436 1010 00 06500 0 117 909 09 689 6694 ma T 805435 181 868 ane nds 9114 318100 ms T NIINI 20A vat F 1 woo woo 2d i ma 2 010 2Q VZ NO 9NIH33LS 181 0 ili 500 2001 0800 1109 2 1 1 i 100 00 06604 9010 00192510 Md WOION 1 EE 500 001 06590 1109 2 1 10000 i 100 7001 08520 ma 39010 20 722 0 14 HOLOW 9NIH331S 181 EE 500 2001 06594 1 0990 f 100 001 06600 41 AN 1 6 06 TT 1044 001000NZ NO V61d veld 3318 181 318000 100 0001 05520 3 1 Md NIN SNINOLLISOd 18161 6 Phaser 7750 Printer Service Manual 10 72 Image Transfer to Accumulator Bel
163. ON OFF OFF 0 91 41 OFF ON 0 60 8 5 x 11 L ON ON ON OFF 0 30 A5S ON ON ON ON 0 00 5 5 x 8 5 S 10 48 Phaser 7750 Printer Service Manual Tray 2 Paper Stacking 186 0677 7 P v6 me 5 Er 1 8 005 dd TVN9IS 03585 90 03838 9017 woooa 8072 i 808836 ON Z cin E 4 5 TATION Z AVEL oanee 1801 1001 0600 TT 5 102 20 ed 0 EH i BE YOSNIS i BAD AVL 1 m BE me E me 4 E Y l wes 035456 4E gor YOSNIS 809436 BANI Z am Rus 134312 AVYL e 1911 1001 06600 el olv 97 29 0990 rerda reid mde 5114 319009 4 WEN woo 20 03501418 may d 3901 NO HOLOW df HTVO33 2 80 4411 200 800 08690 0090 0334 1100 8001 05899 mg 040901 3013390 033 2 39070 NO HOLOW df HHTVO334 AVL 41 4411 1200 8001 0899 3 100 800 08220 ns 2 1244 49079 HOLOW df HI0333 an L3r 200 9
164. OTP Printer Setup es Ethernet Speed AutolP EtherTalk TCP IP Address Configuration Page Connection Setup Page TCP IP Network Mask Network Setup Connection Setup gt USB Setup gt USB Port TCP IP Gateway Reset Connection Setup Wait Timeout Page Description Language SSDP CentreWare IS Requires d NetWare DN GX or DXf configuration IPX Frame Type Tray 3 4 5 Finisher Stored jobs of this type present Page 1 of 2 A 2 Phaser 7750 Printer Service Manual Printer Setup gt continued Paper Handling Setup gt Paper Source 2 Sided Printing Tray 1 MPT Setup Tray 2 Setup Tray 3 4 5 Paper Type Load Paper Timeout Tray Sequence Custom Units Paper Destination Job Offset Stapling Options Cancel After Jams Reset Paper Handling Setup Calibrate for Paper Calibrate Colors Calibrate Margins PostScript Error Info Print Quality Mode TekColor Correction Image Smoothing Reset PostScript Setup Calibration Setup gt Font Number Pitch Point Size Symbol Set Orientation Form Length PostScript Setup gt Fas lese etup PCL Setup gt Front Panel Setup gt Printer Controls File Security p Overwrite Removals Troubleshooting ema g Help Guide Paper Jams gt Remove Job Files Daily Removal Remove At
165. Phaser 7750 Printer Service Manual Map 16 I F Power Board Main Motor LVPS and T2 P J550 P J639 P J536 79581 533 P J568 P J569 ON NN Uf P J551 i Nf P J535 P J15A P J511 P J532 P J510B 7150 077 10 21 Map 17 Developer Motor and Tray 2 Size Switch P610 87 A ee SE 218 P J115 7750 078 10 22 Phaser 7750 Printer Service Manual Map 18 AC Drive Noise Filter and Delay Board 46 FS40 FS39 FS41 P J590 N_ P J439 7 y P J42 FS45 FS48 FS47 P J592 AC DRIVE PWB FS76 593 ir YA J7 FS90 FS77 FS61 FS62 NOISE FILTER PWB DELAY PWB 7750 079 10 23 Map 19 Left Lower Assembly and Tray 2 Feeder TRAY 2 FEEDER P J106 P J125 P J617 P J623 P gt _ 10 24 Phaser 7750 Printer Service Manual Map 20 Tray 3 and 4 Feeders HCF TRAY 3 4 FEEDER P J827 TRAYS P J815 TRAY4 P J828 TRAY4 P J819 lt lt TRAYS P J814 N E P J818 15 FS813 LH CO NI VER INTERLOCK SWITCH P J670 a 841 T P J672 TRAY 3 FEEDER TRAY 4 5 FEEDER P J821 7750 081 10 25 Map 21 Tray 3 Feeder HCF TRAY 3 FEEDER 7750 082 10 26 Phaser 7750 Printer Service Manual Map 22 Trays 3 4 and 5 Paper Size Switches HCF P J816
166. Press any button to abort the test 6 14 Phaser 7750 Printer Service Manual Additional Information For information on the following topics see Service Diagnostics on page 4 2 TRC Adjust ADC Output Check Check ADC Sensor Fail 0 Tone Up Down Check ATC Sensor Fail None Laser Power Check PWM Mapping For Engineering Use Only Storing NVRAM Values on the Hard Drive The Phaser 7750 printer has a hard drive installed in every printer The hard drive boots the PostScript firmware There is a special file on the hard drive that stores the specific calibration values for various sensors and for the laser in the printer During manufacturing the calibration values from the engine have been written to the hard drive The stored values can be written back to the engine NVRAM by performing a front panel Restore Engine NVRAM Now reset procedure engine does not restore correct color registration the RegiCon procedure must be performed After completing the RegiCon process perform the engine NVRAM store function to store the new engine NVRAM values to the hard drive m Ifthe hard drive needs to be replaced there is an engine NVRAM store function in the service diagnostics that enables the current engine NVRAM values to be written to the new hard drive Ifthe engine control board is replaced the NVRAM values on the hard drive need to be written to the new board with the
167. Radio Frequency Electromagnetic Field Conducted IEC 61000 4 6 1996 0 15 80 MHz 3 V 80 AM 1 kHz Line voltage dips IEC 61000 4 11 1994 gt 95 dip for 72 cycle 50 Hz 30 dip for 25 cycles 50 Hz Phaser 7750 Color Laser Printer CISPR 24 Immunity Phenomena Basic Standard Test Specification Line voltage drop out IEC 61000 4 gt 95 dropout for 250 cycles 11 1994 50 Hz This product if used properly in accordance with the user s instructions is neither dangerous for the consumer nor for the environment A signed copy of the Declaration of Conformity for this product can be obtained from Xerox Service Manual Phaser 7750 Color Laser Printer Contents Service 5 iii Symbols Marked the iv Power Safety Precautions V Electrostatic Discharge ESD Precautions vi Service Safety Summary vii Regulatory Specifications ix 1 General Information Printer Introduction and 1 2 Phaser 7750 Printer 0 0 5 1 3 Printer u s ss ere ER mede Ree Ree Res 1 4 Exterior Front 1 4 Exterior Rear VIBW iu sisse ehe
168. SS P626 P J140 4640 7150 064 10 12 Phaser 7750 Printer Service Manual Map 4 Duplex Transport P J136 gt P J135 zr P J540 P J539 DUPLEX TRANSPORT ASSEMBLY 7750 065 10 13 Map 5 Fuser J600 7 2 6 FUSER ASSEMBLY P J240 7750 066 10 14 Phaser 7750 Printer Service Manual Map 6 Fuser P J260 re P J261 APR TT P J212 BLK P J211 P J264 WHT FUSER REAR P J263 P J262 7750 067 10 15 Map 7 Exit Transport P J104 7750 068 10 16 Phaser 7750 Printer Service Manual Map 8 Tray 1 P J219 P J103 7750 069 Map 9 Toner Dispense Motor YMCK Switch 5184 5185 5186 FS182 CRY FS187 ses P J230 NN S n P J229 Q E P J163 FS69 P J228 7150 070 10 17 Map 10 ROS Laser Assembly P J515 P J514 1527 p P J529 P J526 P J528 P J518 7750 071 P J237 7750 072 10 18 Phaser 7750 Printer Service Manual Map 12 HVPS T1 and T3 and 24V LVPS 801 FAB02 505 P J572 FS51 P J214 571 e 1903 4925 P J580 P J669 668 7150 073 10 19 Map 15 Fuser Fuse Board P J407 P J405 P J498 P J403 06 P J400 P J402 lt SE 1 J496 4 410 MCU BOTTOM VIEW 7750 076 10 20
169. T3 24V LVPS 215 Map 3 5 Inverter Transport Assembly 216 Map 3 15 Inverter Transport Assembly 217 Map 3 4 Inverter Transport Assembly 218 Map 3 2 Inverter Transport Assembly 219 Map 3 3 Inverter Transport Assembly 220 Map 7 4 Exit Transport Assembly 221 Map 17 7 Developer Motor Tray 2 Size Switch 222 Map 7 1 Exit Transport Assembly 223 Map 1 8 Xerographic 224 Map 1 6 Xerographic 225 Map 1 3 Xerographic 226 Map 1 20 Xerographic 10 3 Plug Jack No Map Number Item No Title 227 Map 9 17 Toner Dispense Motor Main Switch 228 Map 9 12 Toner Dispense Motor Main Switch 229 Map 9 10 Toner Dispense Motor Main Switch 230 Map 9 9 Toner Dispense Motor Main Switch 231 Map 5 5 Registration Transport Assembly 232 Map 17 9 Developer Motor Tray 2 Size Switch 233 Map 1 2 Xerographic 234 Map 17 1 Developer Motor Tray 2 Size Switch 235 Map 17 2 Developer Motor Tray 2 Size Switch 237 Map 11 3 IBT Accumulator Belt Assembly 240 Map 5 2 Registration Transport Assembly 251 Map 3 6 Inverter Transport Assembly 255 Map 2 4 MOB Sensor Assembly 260 Map 6 5 Fuser Assembly 261 Map 6 6 Fuser Assembly 262 Map 6 3 Fuser Assembly 263 Map 6 4 Fuser Assembly 264 Map 6 9 Fuser Assembly 265 Map 8 2 Tray 5 288 Map 9 18 Toner Dispense Motor Main Switch 400 Map 15 8 MCU MF PWB 40 Map 15 11 MCU MF PWB 40 Map 15 12 MCU MF PWB 40 Map 15 2 MC
170. TT Module Tray 3 4 5 Paper Size Switch 818 Map 20 5 TT Module Tray 3 4 feeder 10 7 Plug Jack Map Number Item No 819 20 4 TT Module Tray 3 4 feeder 820 Map 22 3 TT Module Tray 3 4 5 Paper Size Switch 821 Map 20 6 TT Module Tray 3 4 feeder 822 Map 21 1 TT Module Tray 3 4 feeder 823 Map 21 2 TT Module Tray 3 4 feeder 824 Map 22 3 TT Module Tray 3 4 5 Paper Size Switch 825 Map 21 3 TT Module Tray 3 4 feeder 826 Map 23 7 TT Module rear 827 Map 20 3 TT Module Tray 2 3 feeder 828 Map 20 3 TT Module Tray 2 3 feeder 829 Map 21 4 TT Module Tray 2 3 feeder 841 Map 20 8 TT Module Tray 2 3 feeder 842 Map 23 8 TT Module rear J903 Map 12 13 HVPS T1 T3 24V LVPS J925 Map 12 12 HVPS T1 24V LVPS FS37 Map 6 2 Fuser Assembly FS38 Map 6 1 Fuser Assembly FS39 Map 18 3 AC Drive PWB Noise Filter PWB Delay PWB FS40 Map 18 2 AC Drive PWB Noise Filter PWB Delay PWB FS41 Map 18 4 AC Drive PWB Noise Filter PWB Delay PWB FS45 Map 18 9 AC Drive PWB Noise Filter PWB Delay PWB FS47 Map 18 7 AC Drive PWB Noise Filter PWB Delay PWB FS48 Map 18 8 AC Drive PWB Noise Filter PWB Delay PWB FS51 Map 12 10 HVPS 1 24V LVPS FS56 Map 9 14 Toner Dispense Motor Y M C K Main Switch FS57 Map 9 13 Toner Dispense Motor Y M C K Main Switch FS61 Map 18 16 AC Drive PWB Noise F
171. U MF PWB 40 Map 15 4 MCU MF PWB 40 Map 15 5 MCU MF PWB 40 Map 15 6 MCU MF PWB 407 Map 15 3 MCU MF PWB J410 Map 15 10 MCU MF PWB P410 Map 16 4 PWB MAIN Motor LVPS T2 P460 Map 15 1 MCU MF PWB J496 Map 15 9 MCU MF PWB 10 4 Phaser 7750 Printer Service Manual Plug Jack Map Number Item No 498 15 7 PWB 501 12 19 HVPS 1 24V LVPS 502 Map 12 6 HVPS T1 T3 24V LVPS 505 Map 12 7 HVPS 1 24V LVPS 510 Map 16 23 PWB MAIN Motor LVPS T2 510B Map 16 18 PWB MAIN Motor LVPS T2 511 Map 16 15 PWB MAIN Motor LVPS 2 514 Map 10 3 ROS Assembly 515 Map 10 2 ROS Assembly 516 Map 10 7 ROS Assembly 517 Map 10 8 ROS Assembly 518 Map 10 9 ROS Assembly 526 Map 10 5 ROS Assembly 527 Map 10 1 ROS Assembly 528 Map 10 6 ROS Assembly 529 Map 10 4 ROS Assembly 530 Map 16 13 PWB MAIN Motor LVPS T2 531 Map 16 7 PWB MAIN Motor LVPS T2 532 Map 16 14 PWB MAIN Motor LVPS T2 533 Map 16 1 PWB MAIN Motor LVPS T2 534 Map 16 9 PWB MAIN Motor LVPS T2 535 Map 16 20 PWB MAIN Motor LVPS T2 536 Map 16 8 PWB MAIN Motor LVPS T2 538 Map 4 1 Duplex Transport Assembly 539 Map 4 3 Duplex Transport Assembly 540 Map 4 4 Duplex Transport Assembly 541 Map 23 14 TT Module rear 546 Map 23 1 TT Module rear 547 Map 23 4 TT Module
172. VYL H r4 1811 5 pog BA B bod WNSIS 038138 1 038010 198d eser B si 17 00183 VUL H 5 eser 9 60 21 06620 eb ld Y3HSINIS YSHSINI4 NOLWLYOdSNVUYL TVINOZIHOH Phaser 7750 Printer Service Manual 11 34 Decurler and Paper Transportation 1686 0827 Ul 108098 19012901 84016 UO uni uie 19111290 uo JausiulJ mojaq 9 0 120 21 uo Buruan enun 9 j usaop ay 7 U 81 105095 aui 011504 1401 9 9291 9 SI 108496 ure 19 112901 uo 109 s ure 911291010 0 950912 99111581 y saqesado SEY 101511494 SMOJJ 9 1 219 0 USUM Jaddn 0 0 e seu 31 pue 37 29089 0 auo jeu ozu 34 UIUM 0 SALON 5 JONVYLNA 337909 1 1 1 1 1 1 1 1 BA WA B 1 1 20 6 038435 88 0888 casnas 8047 7 2 Volar 198r B IA g tA
173. ack Locator 10 10 Wiring 0 5 10 29 11 Phaser 7750 Finisher Phaser 7750 11 2 Finisher 11 2 Finisher 5 11 3 Finisher 5 11 5 Internal Assemblies of the Finisher 11 6 Horizontal Transport Sensor Interlock and Switch Locations 11 7 Finisher Sensor Interlock and Switch Locator Map 11 8 Finisher Sensor Interlock and Switch Locator Map 11 9 Finisher 5 11 10 Horizontal Transport Assembly 11 11 Horizontal Transport Top Open Front and Rear Cover 11 12 Horizontal Transport Entrance Upper Cover Assembly 11 13 Horizontal Transport 11 14 Horizontal Transport Entrance Sensor and Top Tray Full Sensor 11 15 Gate In Solenoid Assembly 11 16 Finisher Covers 11 17 Stack Height Sensor Assembly 11 19 Stacker Paper Sensor Assembly 11 20 Set Clamp Clutch and 11 21 Eject Roll
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175. age at J235 1 24 VDC Go to step 4 Use wirenet 8 2 to troubleshoot the missing 24 VDC 4 Run the Black Imaging Unit Motor test from Go to step 5 Use wirenet 8 2 to diagnostics Is the voltage at J235 5 0 VDC troubleshoot with the test running 5 Is the frequency at J235 8 between 1KHz Replace the black Go to step 6 and 1 3 KHz imaging unit motor 6 Is the frequency between J534A 2 and Check for an open Replace in order ground between 1 KHz and 1 3 KHz circuit between until resolved J534A 8 and m engine J235 8 interface board m engine control board 7 Is 3 3 VDC present at J534A 7 with the If there is no Use wirenet 8 2 to Motor test running from diagnostics mechanical bind in the black imaging unit replace the black drum drive motor troubleshoot the missing 3 3 VDC Error Messages and Codes 3 37 Waste Cartridge Full Detection Sensor Failure Code 78 Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Waste Cartridge Waste Cartridge Full Sensor m Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Remove the waste cartridge sensor Go to step 5 Go to step 2 holder without disconnecting the harnesses 2 Measure the voltage between the yellow wire on the waste cartridge full sensor and frame ground alternately interrupting the sensor 3 Does the voltage toggle between 5 and
176. ame defect appears on every other page Note Print the Supplies Usage Page for part numbers 84 mm 3 3 in 94 mm 3 7 in 44 mm 1 7 in 88 3 5 28 3 mm 1 1 Fuser Fuser or Imaging Unit Transfer Roller Developer Roller Imaging Unit service only Page 1 of 1 Remove Print Smears Selecting Remove Print Smears causes the printer to cycle blank paper through the printing path continue selecting this function until the paper comes out clean 5 8 Phaser 7750 Printer Service Manual Engine Test Prints These features are available from the Service Diagnostics Built In Test Prints menu If the Engine Test Prints are rendered correctly and other test prints are defective the problem is not on the engine board Paper Path Options Selecting Paper Path Options allows the printer to be configured as desired for printing any of the following Test Prints The selectable options are Source tray Number of sheets to print Simplex or duplex operation Offset Media type Output destination Stapling Print Laser Check Since all of the laser diodes are energized all colors will be printed resulting in a composite grey image If the image is not grey one or more of the diodes may be bad If there are gaps in the printout or the color is not uniform the unit may require cleaning adjustment or repair 7750 183 Print Quality Troubleshooting 5 9 Print
177. amper Home Sensor 5 Rack 6 Actuator 7 Tamper 8 Finger 9 Spring 10 116 1234 00 1 Compiler Paper Sensor 11 Actuator 12 116 1845 00 Paper Guide 13 116 1269 00 1 Spring 14 Wire Harness 15 End Guide 11 59 PL 17 11 Stacker Elevator Assembly PL17 11 11 12 16 87750 414 11 60 Phaser 7750 Printer Service Manual Stacker Elevator Assembly PL 17 11 No Part Number Qty Description 1 116 1287 00 1 Stacker Motor Assembly 2 116 1276 00 1 Front Elevator Bracket 3 Clamp 4 Bearing 5 116 1274 00 1 Gear Rear 6 Actuator 7 116 1275 00 1 Gear Front 8 Stacker Tray Bracket Assembly 9 116 1273 00 1 Rack 10 Tray Guide 11 116 1270 00 1 Paper Stack Assembly Item 12 16 12 116 1253 00 1 Sensor 13 Actuator 14 Bracket 15 Spring 16 Cover 17 Bracket 18 116 1253 00 Upper Limit Stack A Stack B Sensor 19 Bracket 20 Pin 21 Bearing 22 Shaft 23 Rivot 11 61 PL 17 12 Exit Assembly PL17 12 87750 415 Phaser 7750 Printer Service Manual 11 62 Exit Assembly PL 17 12 No Part Number Qty Description 1 Gear 482 2 Bearing 3 116 1243 00 1 Exit Shaft 4 Collar 5 Gear 32Z 18T 6 Bearing 7 116 1304 00 1 Paddle Gear Shaft REP 17 12 1 8 Paddle Bearing 9 Lower Exit Chute 10 116 1302
178. ansfer Roller Sensor Tray 1 Take Away Sensor Transparency Sensor Registration Sensor on left door optic Paper On Belt Sensor MPT No Paper Sensor Tray 1 No Paper Sensor Level Sensor MPT Paper Size Sensor 7750 460 2 22 Phaser 7750 Printer Service Manual Environment Sensor Accumulator Belt Edge Sensor Automatic Density Control Sensor Accumulator Belt Home Sensor Automatic Toner Concentration Sensor Duplex Wait Sensor Tray 1 Paper Mark On Size Sensor Belt Sensor Waste Cartridge Full Sensor 7750 461 Theory of Operation 2 23 ATC Sensors The ATC sensor is a part of the developer housing It provides an indication of the concentration of toner relative to the carrier beads contained in the developer housing ATC Sensor Generally speaking higher concentrations of toner are more easily developed because they have less triboelectric bond to the carrier beads Lower concentrations have a higher attraction to the carrier beads and therefore require higher charge to develop out The ATC sensor provides its information to the process controls The Tone Up Down test in diagnostics compares a corrected target value to the ATC sensor value on each individual developer If the corrected target value is within 30 of the sensor value then printer logic assumes toner concentration is correct If the corrected target value is greater than 30 units above the sensor value printe
179. anual 9 32 Electrical Components 1 of 3 PL 9 1 No Part number Qty Part Description and part name 1 116 1791 00 HVPS T1 2 116 1792 00 HVPS T3 4 116 1793 00 3 3 LVPS 110V 116 1150 00 3 3 LVPS 220V 5 116 1151 00 5V LVPS 110V 116 1152 00 5V LVPS 220V 6 116 1829 00 Interface Engine Control Board 9 116 1153 00 24V LVPS 110V 116 1154 00 24V LVPS 220V 11 116 1175 00 LVPS Fan 14 116 1794 00 HVPS T2 Service Parts Lists 9 33 Part List 9 2 Electrical Components 2 of 3 PL9 2 112 12 16 20 87750 378 Electrical Components 2 of 3 PL 9 2 No Part number Qty Part Description and part name 1 116 1796 00 AC Power Chassis Assembly 110V 116 1797 00 AC Power Chassis Assembly 220V 13 116 1801 00 Outlet Panel 14 116 1798 00 Power Cord 9 34 Phaser 7750 Printer Service Manual Part List 9 3 Electrical Components 3 of 3 PL9 3 87750 379 Electrical Components 3 of 3 PL 9 3 No Part number Qty Part Description and part name 1 116 1223 00 Developer Block 2 116 1312 00 Wire Harness 3 116 1307 00 Wire Harness Y M 4 116 1308 00 Wire Harness C K 5 116 1913 00 2nd Wire Harness 6 116 1306 00 DTS Connector 7 116 1310 00 DTS Wire Harness 8 116 1799 00 DC Wire Harness Service Parts Lists 9 35 Part List 10 1 Front Cover PL10 1 1 41 7 89 F
180. anual Optional Lower Trays Right Side Door 1 Remove the 4 screws securing the right hand cover and remove Rear Cover 1 Remove the 4 screws securing the cover 2 Remove the rear cover 7750 238 Service Parts Disassembly 8 57 LTD HCF Cover Assembly 1 Open Door C 2 Remove screw from each of the support straps 3 Remove 1 screw from the cover s front pivot bracket 4 Remove the cover assembly from the rear pivot Rear Cover Interlock Switch Front Pivot Bracket 7750 164 8 58 Phaser 7750 Printer Service Manual High Capacity Feeder HCF Tray 4 1 On the left side of the High Capacity Feeder remove one screw from the Tray 4 stopper bracket and remove the bracket 2 Pull Tray 4 out of the printer TRAY 4 STOPPER BRACKET 7750 028 High Capacity Feeder HCF Tray 5 and Paper Transport 1 Open Tray 5 2 Remove the 2 screws that secure the Tray 5 stopper 3 Remove the 2 screws securing the paper transport and slide it back in 4 Pull Tray 5 out of the printer PAPER TRANSPORT 7750 029 Service Parts Disassembly 8 59 LTD HCF Feeder Paper Select Switches 1 Remove the paper tray 2 Reach inside the cabinet and disconnect the wire harness 3 Reach inside the cabinet and remove the 1 screw that secures the paper select switch Universal Tray Paper Select Switch 3X Universal Tray Assembly 7750 154 8 60 Phaser 7750 Printer S
181. ard using the Service Diagnostics procedure Diagnostic Engine NVRAM Reset on page 6 20 8 42 Phaser 7750 Printer Service Manual Engine Control Interface Board Caution Two connectors have locks to release before pulling on the harnesses Method 1 1 After removing the engine control board see page 8 42 2 Disconnect the 8 wiring harnesses 3 Loosen the 2 mounting bracket screws and remove the interface board from the white plastic mounting posts 7750 023 Method 2 1 Lower the HVPS assembly to a horizontal position 2 Disconnect the 8 wiring harnesses 3 Remove the 2 screws that secure the engine control interface board mounting bracket to the printer frame 4 Remove the engine control interface board and mounting bracket from the printer frame Service Parts Disassembly 8 43 3 3 VDC and 5 VDC Low Voltage Power Supplies Note If removing only one of the low voltage power supplies disconnect the associated wiring harness from the printer and remove the 4 screws that secure the low voltage power supply to the mounting bracket 1 Move the and power supplies out of the way 2 Disconnect P Js 510 511 15 and 16 from the low voltage power supplies 3 Loosen the 4 screws securing the mounting bracket to the frame 4 Lift power supply up and out to remove
182. are made to accommodate improved components as they become available It is important when ordering parts to include the following information Component s part number W Product type or model number Serial number of the printer Serial numbering Particular fields in the serial number indicate the modification level of the printer the date of its manufacture and the sequence number of the printer produced on that day The serial number is coded as follows text S N followed by the serial number in the barcode W The barcode does not include a field identifier The nine digit serial number is based on the following format PPPRSSSSS PPP Three digit alphanumeric product code Product Model Voltage Product Code 7750 B DN GX DXF 110V RRW 7750V B DN GX DXF 220V RTG R Single digit numeric revision digit To be rolled when a major product change occurs Initiated with a change request SSSSS Five digit numeric serial number Serial Number Example RRW453072 RRW Product code for the 110V Printer 4 Revision level 53072 Serial number 9 2 Phaser 7750 Printer Service Manual Using the Parts List 1 No The callout number from the exploded part diagram 2 Part Number The material part number used to order specific parts 3 Qty This number represents the parts per printer not the number of parts supplied in the actual part order 4 Name Description Detail
183. as a Class 1 Laser Product This means that this is a class of laser product that does not emit hazardous laser radiation this is possible only because the laser beam is totally enclosed during all modes of customer operation When servicing the printer or laser unit follow the procedures specified in this manual and there will be no hazards from the laser Service Manual vil Servicing Electrical Components Before starting any service procedure switch off the printer power and unplug the power cord from the wall outlet If you must service the printer with power applied be aware of the potential for electrical shock Warning Turning the power off by using the On Off switch does not completely de energize the printer You must also disconnect the printer power cord from the AC outlet Position the power cord so that it is easily accessible during servicing Warning Do not touch any electrical component unless you are instructed to do so by a service procedure 7500 117 Servicing Mechanical Components When servicing mechanical components within the printer manually rotate drive assemblies rollers and gears Warning Do not try to manually rotate or manually stop the drive assemblies while any printer motor is running 7500 118 Servicing Fuser Components Warning This printer uses heat to fuse the toner image to media The Fuser Assembly is VERY HOT Turn the printer power off and wait at least 5 minutes for the
184. assembly allows light into the imaging unit area avoid exposing the imaging units to light 2 15 the belt home marker present This is a 7 mm square silver patch on the rear edge inside the belt Rotate the belt if you cannot see the marker 4 1 On the accumulater belt assembly Replace in the Go to step 5 rotate the belt drive gear in the normal following order process direction until the belt home m engine control marker is positioned beneath the belt interface board home sensor m engine control 2 Reinstall the belt assembly 3 Enter service diagnostics and run the Accum MOB Sensor test 4 15 MOB sensor is displayed 5 1 Replace the accumulator belt Troubleshoot and Complete assembly repair using the 2 Retest Reflective Sensor 3 Does error 30 return Procedure on pg 3 45 6 1 Partially remove the accumulator belt Go to step 14 Go to step 7 assembly 2 Manually rotate the drive gear clockwise 3 Does the belt turn freely 7 1 Inspect the a ccumulator belt cleaner Go to step 9 Go to step 8 and waste auger for packed toner 2 Are the belt cleaner and auger clean and free of toner 3 Do the gears rotate freely 3 20 Phaser 7750 Printer Service Manual Troubleshooting Procedure Continued Step Actions and Questions Yes No 8 1 Using a Il Toner Vacuum vacuum Replace the belt Go to step 9 out the belt cleaner and waste auger cleaner assembly 2
185. ayy 1291010 0 8868 0 9 51591 enu uo sapoo au uy suoneredo seu 10151 9 aui 119 101910 UIAM 0 NuO NO em 171 NO YOSNAS YINY09 11083 114418 YOSNAS 314418 11244 NO NYO BA 39019 NO 314418 180 01 080 21 0620 13 JANG 31915 RA 30019 NO 31dVLS ego 01 080 211 0820 BA 39019 NO YOLOW 114915 ego 01 080 1 08620 seer 2 39019 20 2 NO YOLOW YOLOW 31415 ego 01 080 1 0820 314418 WA 108 13 77915 035435 098 03835 YINY09 998 6114 YOSNAS JOSN3S YINY09 1084 314918 805135 314418 1822 21 08890 11084 314418 5 WNBIS 09598 0018 ger 30585 YOSNAS 314918 805335 314915 1 2 211 06620 114918 Md 5 YSHSINIS SNINOILISOd 114418 21 11 37 Staple Control 788 06 aur INU 1991019 esearoui 920151691 IY seu 10161101 aug SMOY 119 119910 UIM
186. bly 6 116 1244 00 1 Right Cover 7 116 1278 00 1 Stacker Tray 8 116 1279 00 1 Screw 9 Bracket 10 Front Bracket 11 Stud Screw 12 Rear Bracket 11 43 PL 17 2 Gate Assembly PL17 2 Gate Assemblies PL 17 2 87750 405 No Part Number Qty Description 1 116 1292 00 Gate Cover 2 Bearing 3 116 1293 00 Gate Assembly items 4 14 4 In Gate 5 In Gate Lever 6 116 1294 00 Gate Bracket 11 44 Phaser 7750 Printer Service Manual PL 17 3 Horizontal Transport Assembly 1 of 2 PL17 3 1 2 7 H Transport Assembly 1 of 2 PL 17 3 87750 406 No Part Number Qty Description 1 116 1290 00 H Transport Cover Assembly 3 116 1291 00 Magnet 4 Screw 6 116 1246 00 Roll 9 116 1289 00 Entrance Upper Cover Assembly 13 116 1821 00 Thumbscrew 14 116 1259 00 Front Cover 15 116 1261 00 Upper Rear Cover 16 116 1263 00 Rear Cover 11 45 PL 17 4 Horizontal Transport Assembly 2 of 2 PL174 1 2 13 17 87750 407 Horizontal Transport Assembly 2 012 PL 17 4 No Part Number Qty Description H Transport Roll in H Transport Roll out 116 1284 00 H Transport Belt Roll Support Bearing Harness Guide Cover o NI N 116 1644 00 Entrance Sensor 11 46 Phaser 7750 Printer Service Manual Horizontal Transport Assembly
187. board m image processor board High Voltage Power Supply Failure Code 86 Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Cycle power to the printer to clear the Complete Replace in the error following order 2 Didthis clear the error m T3HVPS m image processor board 3 40 Phaser 7750 Printer Service Manual Tray Lift Failure Code 87 The tray level sensor does not detect that the tray has lifted Examine the trays and paper feed assemblies for any physical damage before starting the troubleshooting procedure Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Tray Level Sensor Paper Select Switch Assembly Paper Feed Motor Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 Is the problem with Tray 2 Go to step 2 Go to step 7 2 1 Pull out and then reseat Tray 2 2 Does the lift motor operate Go to step 3 Go to step 4 1 Did the Error Code 87 clear from the front panel Complete This could be an intermittent problem If the problem returns replace in order m tray level sensor engine interface board Replace the engine control board 1 Using Service Diagnostics test the tray 2 Sensors 2 Does the level indicate H Replace in order until resolved m tray level sensor m No paper sensor m engine interface board m
188. cation of Jam lt Press Back or Cancel to exit gt Fault History lt nnn gt text mmm lt gt is a service defined numeric code see Service Usage Profile Status Codes on page A 5 for code definitions text is the fault description mmm is the fault count The maximum fault count is 100 and rolls to 1 on overflow All count values are 0 at power on Built In Test Prints Prints pre defined images stored in the engine firmware for troubleshooting image quality problems Paper Path Options For Print Laser check only Selects tray count of continuous sheets simplex duplex offset media type weight finisher staple Source tray Tray 2 5 Tray1 MPT Yes No Press Up Down to change setting Current sheets is n Select new sheets Press Up Down to change the number Yes Press Info to shift column No Simplex Duplex Press Up Down to change setting Change Duplex setting Yes No Offset None Auto Front Rear Set a new offset Yes No Press Up Down to change setting Media Type Set New Media Type Yes No Press Up Down to change setting Output Destination Change Output Setting Yes No Press Up Down to change setting This option is only available with an optional finisher installed Stapling is Set new stapling options Yes No Press Up Down to change setting This option is only available with an optional finishe
189. ce make sure the printer is switch OFF All voltage values given in the troubleshooting procedures are approximate values The main purpose of voltage readings is to determine whether or not a component is receiving the correct voltage value from the power supply and if gating a voltage drop occurs during component actuation When a troubleshooting procedure instructs you to replace a non spared component and that component is part of a parent assembly replace the entire parent assembly Phaser 7750 Printer Service Manual System Startup and POST System Boot Sequence 1 When the main power switch is turned on the health LED on the image processor board turns on immediately 2 The boot loader checks for RAM present and functional If not it posts a very large RAM ERROR on the front panel and blinks the LED 1 2 second on off continuously The boot Loader then runs POST diagnostics POST turns off the health LED POST checks the front panel If buttons have been pushed the front panel displays Processing Input The front panel LED cycles Green Yellow Red and then off O N Oa The front panel turns on the LED turns Green and the POST tests are run Power On Self Test POST The following tests are performed when the printer is powered on after the boot loader runs and before the operating system is loaded and initialized POST diagnostics are intended to provide a quick mean
190. ces m Fuser Fan m LVPS Fan m Rear Fan Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Enter service diagnostics run the Go to step 4 Go to step 2 fan test 2 Does the fuser fan rotate at a high speed 2 1 Check for voltage at J222 4 Go to step 3 Check the wiring 2 Does the voltage measure 24 VDC to the fuser fan if the wiring is OK replace the engine control board 3 Does the front panel indicate the fans are Replace the fan Check the wiring ON to the fuser fan if the wiring is OK replace the engine control board 4 Does the rear fan revolve at high speed Go to step 7 Go to step 5 B 1 Check for voltage at J552 1 Go to step 6 Check the wiring 2 Does the voltage measure 24 VDC to the rear fan if the wiring is OK replace the interface board If the problem continues replace the engine control board Error Messages and Codes 3 33 Troubleshooting Procedure Continued Step Actions and Questions Yes No 6 Does the front panel indicate the fans are ON Replace the rear fan Check the wiring tot he rear fan if the wiring is OK replace the engine control board 7 Does the LVPS fan revolve at high speed The fans are operating correctly If the problem persists replace the engine control board Go to step 8 8 1 Check for voltage at J214 4 2 Is 24 VDC present Go to step 9 Check the wiring to
191. chnology and IntelliSelect are trademarks of Adobe Systems Incorporated or its subsidiaries which may be registered in certain jurisdictions Apple LaserWriter LocalTalk Macintosh Mac OS AppleTalk TrueType2 Apple Chancery Chicago Geneva Monaco and New York are registered trademarks and QuickDraw isa trademark of Apple Computer Incorporated PCL and HP GL are registered trademarks of Hewlett Packard Corporation Windows and Windows NT are registered trademarks of Microsoft Corporation Novell NetWare Npps NDS and Novell Directory Services are registered trademarks and and Novell Distributed Print Services are trademarks of Novell Incorporated Sun and Sun Microsystems are registered trademarks of Sun Microsystems Incorporated SPARC is a registered trademark of SPARC International Incorporated SPARCstation is a trademark of SPARC International Incorporated licensed exclusively to Sun Microsystems Incorporated SWOP is a registered trademark of SWOP Inc UNIX is a registered trademark in the US and other countries licensed exclusively through X Open Company Limited As an ENERGY STAR partner Xerox Corporation has determined that this product meets the ENERGY STAR guidelines for energy efficiency The ENERGY STAR name and logo are registered U S marks This product uses code for SHA 1 written by John Halleck which is being used with his per
192. ck Map Diagrams m Laser Assembly L m Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Remove the rear cover from the Complete Replace the laser printer unit 2 Disconnect P401 and P402 from the You must Engine Control Board perform the RegiCon Adjustment after replacing the laser unit 3 Carefully reinsert the plugs into their joint socket and FIRMLY seat them 4 Did this fix the problem If the problem persists replace the engine control board 3 12 Phaser 7750 Printer Service Manual Yellow ATC Sensor Failure Code 12 Magenta ATC Sensor Failure Code 13 Cyan ATC Sensor Failure Code 14 The ATC Sensor detects an insufficient amount of developer Note If this failure reoccurs three times successively an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault see pg 6 20 is performed Applicable Parts Wiring and Plug Jack Map Diagrams ATC Sensor and Harness Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 Is the problem toner and or developer Replace the toner Go to step 2 empty or developer 2 Is the ATC sensor clean and free of dust Go to step 3 Clean the ATC toner or any other contaminates sensor 3 1 Check the ATC sensor wiring harness Replace the ATC Go to step 4 Yellow P J129 Sensor and or Magenta P J 130 wirin
193. ck open 67 No heavy paper HC tray 2 43 Finisher Front Door open 68 No laser paper tray 3 printing 44 HT Interlock Sensor open 69 No heavy paper tray 3 printing 45 Docking Interlock open 70 No laser paper HC tray 3 46 Stapler near empty 71 No heavy paper HC tray 3 47 Finisher tray fail 72 No laser paper tray 4 printing 48 Finisher at capacity 73 No heavy paper tray 4 printing 49 job not stapled 74 No laser paper HC tray 4 50 Finisher full 15 No heavy paper HC tray 4 51 Finisher paper size change 76 No OHP in MPT 52 Output Tray Full 11 No heavy paper in MPT 53 No paper standard tray 4 78 No color laser labels in MPT 54 No paper tray 3 printing from 3 79 No envelopes in MPT 55 No paper tray 2 printing from 2 80 No thin cover index in MPT 56 No paper tray 1 printing from 1 81 No thick cover index in MPT 57 No paper high capacity trays 82 No laser paper in MPT 58 No paper high capacity trays 83 No paper in MPT 59 No paper high capacity trays 84 OHP in MPT needs labels 60 No laser paper tray 1 printing 85 OHP in MPT needs heavy paper 61 No thin cover index tray 1 86 OHP in MPT needs envelope 62 No heavy paper tray 1 printing 87 OHP in MPT needs thin 63 No tray 1 printing from 1 88 OHP in MPT needs thick 64 No laser paper tray 2 printing 89 OHP in MPT needs paper 65 No heavy paper tray 2 printing 90 Paper in MPT needs OHP A 6 Phaser 7750 Printer Service Manual
194. clutch and gear see page 11 21 Remove both KL clips from the set clamp shaft oc Push the bearings out of the frame assembly and remove the shaft 11 22 Phaser 7750 Printer Service Manual Finisher Control Board Bracket and Shield o o a 5 57700 365 57700 366 57700 367 Remove the rear cover see page 11 17 Remove 8 screws and loosen the two bottom screws Remove finisher control board shield Undo all the connectors Remove 2 screws on the left Loosen 1 screw on the right Undo one connector Loosen the outer screws located at the bottom of the finisher control board cover Remove the 8 remaining cover screws 11 23 10 Remove the finisher control board cover 11 Remove the 4 wiring connectors 12 Remove 6 screws from the control board remove Note When reinstalling the cover do not insert screws into the second or fourth holes at the bottom of the cover as these are used to secure the outer cover 11 24 Phaser 7750 Printer Service Manual Stacker Motor Assembly 57700 361 1 Remove the finisher control board bracket and shield see page 11 23 2 Remove 1 connector 3 Remove 3 screws securing the stacker motor assembly and remove Note When reinstalling ensure the gear is engaged and the sensor for the stacker is tripped 11 25 Paddle Shaft 87700 362 Remove the rear left an
195. d factory repair centres Refer to the Service Manual for replacement instructions Service Parts Disassembly 6 37 Image Processor Board 1 Turn the power OFF and unplug the printer Caution The image processor board is susceptible to ESD damage Observe proper ESD precautions 2 Disconnect all communication cables 3 Remove 4 screws securing the image processor board and remove the board 4 The following should be transferred to a the new board if the image processor board is being replaced Internal Hard Drive NVRAM chip to preserve the customer s network and setup values Memory m Configuration Chip Note Make sure the image processor board is fully seated when reinstalling socketed 125555 0222 puedes 7750 248 8 38 Phaser 7750 Printer Service Manual Internal Hard Drive Caution The internal hard drive is susceptible to ESD damage Observe proper ESD precautions 1 Remove the image processor board 2 Using a T 10 torx bit remove 4 screws from the bottom side of the image processor board holding the Internal Hard Drive 3 Slide the internal hard drive away from the connector Fig 1 Fig 2 7150 235 Replacement Procedures Caution Itis possible to mis align the pins when seating the new internal hard drive Note If you replace the internal hard drive you must enter Service Diagnostics Mode and run the Stor
196. d right covers see page 11 17 Remove the cam bracket assembly see page 11 28 Remove the staple unit see page 11 29 Remove the e clips from both ends of the shaft Remove the gear and bushing from the front end of the shaft Remove the bushing from the front and slide out the shaft Remove the bushings and KL clips from both ends oat Slide the shaft to the rear and slide out 11 26 Phaser 7750 Printer Service Manual Paper Transport Motor Motor Assembly Main up 57700 338 1 Remove the Rear Cover see page 11 17 2 Remove 4 screws 3 Undo the connector and lift the motor up and then out to free the belt 11 27 Cam Bracket Assembly 7700 341 Remove the rear and top covers see page 11 17 Remove 1 screw securing the decurler cam sensor Remove 1 screw from the eject clamp home sensor Disconnect the wiring harness from the set clamp home sensor Remove the wiring harness from the bracket Disconnect the wiring harness from the eject motor Remove 4 screws from the bracket and remove the cam bracket assembly Note When reinstalling the cam bracket assembly the manipulate the eject assembly to ensure the gears follow one another from the back of the cam bracket assembly Manually push the set clamps to engage the gears 11 28 Phaser 7750 Printer Service Manual Staple Unit Assembly and Motor 0 0 9 E
197. de Definitions Paper Weight Equivalence Table Appendix Menu Map Main Menu peany to print Front Panel Buttons 24 Up Arrow Information gt ok OK Walk Up Features gt Cancel 2 Information Printer Setup gt 8 Troubleshooting Back oe Down Arrow 5 prints an information page Model 18 Help Guide 18 Supplies Usage Page Information gt Printer Name Configuration Page Cyan Toner Life Print Server Paper Tips Page Magenta Toner Life Menu Map IP Address 48 Supplies Usage Page Yellow Toner Life Serial Connection Setup Page Black Toner Life Printer Identification gt Activation Date 18 Moving Guide Imaging Unit 1 Life Startup Page Imaging Unit 2 Life Information Pages 5 Usage Profile Imaging Unit 3 Life Sample Pages Graphics Demonstration 8 PostScript Font List Imaging Unit 4 Life ey Office Demonstration PCL Font List Fuser Life 2 Sided Demonstration Waste Cartridge Life CMYK Sampler Pages Belt Cleaner Assembly Life 5 RGB Sampler Pages Transfer Roller Life Staple Cartridge Life Reset Transfer Roller Life Walk Up Features gt d Reset Belt Cleaner Assembly Life Total Print Count Proof Print Jobs Saved Print Jobs Secure Print Jobs Walk Up Printing Select for Installation TCP IP Setup p NetWare Setup gt DHCP BO
198. dyno ayy sdoup ay pauous si 90 AG 001291014 118 112 910 101291014 1104 ra 9 TA 4 m 01 W02 24 g SaM Aver OL OGASt 1100 9a XE oane 00 Wo m el 2 BA AUD Ji 008 1 1 1 9 LAW WA 1 TW twee 9 8284 oor 90801 0950 41119900 NOLIVU3N39 HOW NO aaa manoa anoa 9 amd TW 2018 90AS SdATAS OL 4 Xadna HOW NO Y4MOd veld amd 553 7104109 3188 NOW 4HO NO on samast 21 189 AWD 90189 30018001 Hg bis 90A 55 Em 318VN3 ASt zu 90186 1614 414408 YIMOd 39VL10A ASt NOLIVH3N39 tL 10 35 DC Power Generation 24 VDC 992 0522 T 8 83404 0101 1100 20 tJ BHSINH OL wo9 20 HSIN 90125 LLL 00 sanve o0 INI WL OL OIA 201925 1103 90 0 20192 0647
199. e 00 C 81 1110 m 101011 508 101011 508 091 900 8600 180400 06270 It LE 801 NON 814 NIN ASSY 908 YITIOWLNOD 3 0 1135 839116 9 Laser Shutter Control 6 6 06 1900 5 15 19 ay 55916049 qof e ejiuw 20 191 10 Jemod s ejs 18015 aly epoyy qpugjs uj 1915 aui 95012 0 uo 51 9801 1 HNY SOY 10109 100 ayy JO 910 10 15910 JUM SOY VIUM 2 anys y uado 0 uo si uado 194045 SOY 510 02 100 JO 10 189119 5015 IM SOY 21090 11006 0 Jay NYs ay oj uo SI 8801 194145 SOY Pasojd pue uo 19 00 uomejado ui jou SOY alum 5119015 ayy 88810 SOY 11191940 104 9 LON 390 1831NI 90 1831NI 9aave 919019 NO YOLOW SOY 390 150 600 06820 35019 1070 600 08820 919019 NO YOLOW 831L0HS 508 340 170 600 06820 35019 10 0 6001 06620 TA 9QAS 919019 Ave NO YOLOW H3LLOHS SOY 340 170 6001 06820 35012 1090 600 08690 THA a YOLOW 5 508 Over 99019 Avc NO YOLOW YALLNHS 508 340 170 600 06820 35012 070 600 0 90 56057 0900 1 i j
200. e Finisher 11 5 Internal Assemblies of the Finisher Exit Assembly Cam Bracket Assembly Main Motor Finisher Control Board Decurler Stacker Motor Assembly Compiler Tray 57700 372 Staple Assembly Track Staple Unit 11 6 Phaser 7750 Printer Service Manual Horizontal Transport Sensor Interlock and Switch Locations Gate In Solenoid H Transport Entrance Sensor H Transport Interlock Sensor 1 Face Down Tray Full Sensor H Transport Exit Sensor S7700 447 Finisher Sensor Interlock and Switch Locator Map Stack Height Sensor Eject Clamp Home Sensor Decurler Cam Home Sensor Docking Interlock Sensor 57700 449 11 8 Phaser 7750 Printer Service Manual Finisher Sensor Interlock and Switch Locator Map Rear Tamper Tamper Unit Home Sensor Top Cover Interlock Switch Stacker Upper Limit Switch Staple Move Sensor Front Cover Stack A Sensor Interlock Switch Stack B Sensor Staple Front Corner Sensor 7700 448 11 9 Finisher Disassembly This section details the removal and replacement procedures for the main assemblies of the Phaser 7750 light finisher When replacing sensors actuators interlocks and or switches W Refer to the appropriate locator map to identify the sensor m Remove the necessary covers m Press down on the two locking tabs located at the top of the senso
201. e Motor Index 7 disassembly 8 28 Toner Waste Cartridge diagnostic test 4 7 Top Cover disassembly 8 5 Top Rear Cover disassembly 8 7 Transfer Roller contact failure code 20 3 17 retract failure code 21 3 17 Transfer Roller Sensor diagnostic test 4 7 Tray lift failure code 87 3 41 Tray 1 MPT size sensor error code 3 43 Tray 1 MPT Feed Solenoid diagnostic test 4 11 Tray 1 MPT Sensor diagnostic test 4 7 Tray 1 MPT disassembly 8 9 Tray 1 Feeder disassembly 8 17 Tray 1 Paper Size switching wiring diagram 10 44 Tray 1 Paper Stacking wiring diagram 10 49 Tray 2 Paper Size Switching wiring diagram 10 45 Tray 2 Paper Stacking wiring diagram 10 50 Tray 2 Paper Select Switches disassembly 8 53 Tray 3 Paper Size Sensing wiring diagram 10 46 Tray 3 Paper Stacking wiring diagram 10 51 Tray 4 Paper Size Sensing wiring diagram 10 47 Tray 4 Paper Stacking wiring diagram 10 52 Tray 5 Paper Stacking wiring diagram 10 53 tray feed sensors diagnostic test 4 6 Phaser 7750 Printer tray lift failure code 87 3 41 tray module paper transport drive control wiring diagram 10 57 tray module paper transportation wiring diagram 10 56 tray module power interlock switching wiring diagram 10 38 tray sensor diagnostic test 4 7 tray specifications 1 13 trays troubleshooting false load message 4 15 troubleshooting missing 4 15 TRC Adjust diagnostic test 4 11 troubleshooting background
202. e NVRAM test Service Parts Disassembly 6 39 Electrical Chassis Card Cage Assembly Note Before removing the electrical chassis assembly it is recommended you store the Engine NVRAM data to the hard drive See Store Engine on page 6 21 Remove the right cover see page 8 4 Remove the top cover see page 8 5 Remove the rear cover see page 8 6 Remove all 3 shields the rear of the printer Remove the image processor board see page 8 38 oar OND Disconnect the 9 wiring harnesses along the edges of the engine controller board 7 of these harnesses are in front of the controller board The other 2 are on the left side 7 Two of the engine control connectors have connector locks There is 1 harness clip to release 8 Undo the harness retainer Disconnect the wiring harness to the relay board connector P300 and the front panel cable to P564 9 Remove the 2 mounting screws towards the rear of the printer but only loosen the two mounting screws towards the printer front Note The 2 screws toward the printer front serve as a guide for reinstallation 7750 027 8 40 Phaser 7750 Printer Service Manual 10 Lift and tilt the cage assembly to release it from the engine control interface board connector below the cage assembly and remove the assembly Replacement Procedures Note Before re installing the assembly widen the gap in each of the two white nylon retainers to ensure that
203. e Power subsystem includes five motors and their driven assemblies W Main Motor The main motor provides the drive for paper feed black developer housing and the fuser The main motor gets 24 VDC power from the 24 Volt power supply by way of the interface board The motor enable and speed control signals come from the microprocessor on the engine control via the interface board Accumulator Belt Motor The accumulator belt motor turns the drive roller for the accumulator belt and the accumulator belt cleaner auger W Transfer Roller Motor Engages and retracts the transfer roller W Developer Motor The developer motor provides the drive for the C Y and M developers Theory of Operation 2 11 Imaging Unit Motors There are two imaging unit motors providing drive to the four imaging units one drives the Y M and C drums and the other drives the K black drum Like the main motor the drum motors get 5 and 24 volt DC power from 5 and 24 volt power supplies via the interface board The motors are enabled and the speed is controlled by the engine control board Black Imaging Unit motor K hidden Developer drive assy Imaging Unit Accumulator drive assy belt drive assy 7150 451 2 12 Phaser 7750 Printer Service Manual System Power Supplies The System Power Supplies consist of the T1 T2 and T3 HVPS the 24 Volt LVPS 3 3 VDC LVPS and the 2 5VDC LVPS Engine ControNnterface Board High Voltage Power Su
204. e appropriate or corresponding Imaging Unit Plate Make sure the ATC sensor tag label can be located if needed later 6 Record the number for entering into NVRAM in the next step 7 Perform the ATC Sensor Setup procedure see page 6 14 Caution It is important to re enter the ATC value when replacing a developer Failing to do so could result in poor color balance and shortened developer life Note The ATC sensor tag is difficult to view once the developer has been installed Remove the label prior to installation Service Parts Disassembly 8 27 Toner Dispense Motor Assembly 1 Remove the right cover see page 8 4 2 Remove the top cover assembly see page 8 5 3 Remove the dispense housing assemblies see page 8 20 4 Remove the 2 screws that secure the toner dispense motor assembly to the printer frame 5 Disconnect the wiring harness from each motor 6 Remove the toner dispense motor assembly 7750 019 8 28 Phaser 7750 Printer Service Manual Steering Drive Assembly 1 Remove the Imaging Units and Imaging Unit Plate Cover see page 8 22 2 Disconnect the wiring harness 3 Remove the 3 screws securing the Steering Drive Assembly and remove the assembly from the printer 7750 127 Replacement Procedures Note You may have to rotate the CAM gear to reinstall the steering drive assembly Service Parts Disassembly 8 29 Mark On Belt MOB Sensor Remove the waste cartridge assemb
205. e determines if the chevrons developed on the center of the accumulator belt are in the correct location relative to the front and rear chevrons To perform the procedure the MOB sensor is positioned to the center of the accumulator belt and the chevrons are developed Pattern on the previous figures shows the chevron patterns In this procedure the midpoints of the scan lines for all four colors are aligned for magnification balance 4 Skew Rough Setup The Skew Rough Setup is used only when skew is outside of the measurement parameters of Skew Fine Setup It should be run in situations when the registration is so far out of specification as to be immeasurable by the Skew Fine Setup routine In this routine Pattern 2 from the figure showing the chevron patterns is developed and the registration of the images is calculated If necessary the skew of the image can be adjusted manually Theory of Operation 2 19 View the RegiCon Patterns It is possible to see the patterns that are developed on the accumulator belt for the RegiCon calibration by performing the following steps If there is a finisher present on the machine slide it to the right so that the right hand access door to the accumulator belt can be opened Open the access door and activate the interlock Power down the Phaser 7750 printer Open the front door and release the accumulator belt by releasing the latch assembly and pulling down the lift lever as
206. e roller provides a longer contact time and a larger area of contact with the heat roller thereby providing better fusing Fuser Life Expectancy The life expectancy of the fuser is 60 000 letter A4 size pages Several factors can reduce the life of the fuser Greater than 5 coverage Paper use larger than letter size Printing on heavy media Printing short edge feed Printing on transparencies or specialty media Three fuses on the fuse board in the fuser assembly are used in conjunction with a PostScript algorithm to determine the life used Fuses are blown in the reverse order than they were on the Phaser 7700 3 2 1 instead of 1 2 3 Fuse 3 is blown after 100 prints are made Fuse 2 is blown at 50 of life and fuse 1 is blown at 99 of life used If fusers are swapped between printers and don t have the exact same configuration of blown and closed fuses the printer will make a fuser life assumption based on which fuses are closed and then set the fuser life using that assumption after 100 prints are run All fuses closed new fuser Fuse 3 open fuse 2 and 1 closed life will be set at 25 used Fuse 3 and 2 open fuse 1 closed life will be set at 75 used All fuses open life is set at 99 used 2 8 Phaser 7750 Printer Service Manual EAHG Toner EA Emulsion Aggreate High Gloss toner is a relatively new type of toner with particles that are more spherical and uniform in size This toner will be used for all
207. ead 24 VDC assembly interlock circuit finisher control board 3 50 Phaser 7750 Printer Service Manual Front Tamper Home Sensor Failure Code 114 With the Front Tamper Home Sensor OFF the Front Tamper Home Sensor did not turn ON within 800 ms after the move to the Front Tamper Home position has begun With the Front Tamper Home Sensor on the Front Tamper Sensor did not turn Off when the Front Tamper Home Sensor is deactuated Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Front Tamper Motor m Finisher Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Run the Front Tamper Low Front Go to step 6 Go to step 2 Front Tamper Low Rear test in diagnostics 2 Does the front tamper guide operate 2 Does the front tamper motor operate Check the Go to step 3 tampering mechanism for a mechanical problem 3 1 Check pins 4877 A pins 1 3 4 and 6 Go to step 4 Go to step 5 2 18 24 VDC present on any of the pins 4 1 Check the following wires for and open Repair or replace Replace in order circuit or short circuit to ground Is any the wiring until resolved wire open or shorted harness m fronttamper J877A 1 to J848B 7 motor J877A 3 to J848B 9 finisher control J877A 4 to J848B 10 board J877A 6 to J848B 12 5 15 24 VDC present on pins J848B 8 and Replace the Troubleshoot and J848B 11 on the finisher control board finisher
208. ear lt 9 654 gt Clear lt 9 910 913 gt Clear lt 10 348 amp 10 350 gt Error Code 30 Error Codes 12 13 14 amp 15 ADC Sensor Error Imaging Unit type mismatch Error Codes 40 and 44 Reset CRU Life Counters Resets the life on individual routine maintenance items Reset Engine Writes data to Eng NVM This writes data from the NVRAM Are you sure hard drive to the engine Yes NVRAM No See Resetting Engine on page 6 17 4 12 Phaser 7750 Printer Service Manual Test Front Panel Display Test Operation Definition Store Engine NVRAM Writes data to HD Are you sure Yes No This takes data from engine and stores it onto the drive See Store Engine NVRAM on page 6 21 Exit Exits to PostScript without running POST General Troubleshooting 4 13 Front Panel Troubleshooting The Printer Does Not Come to a Ready State Printer Does Nothing When Power is Switched On See Troubleshooting AC Power on page 4 16 LVPS Fuser and ROS Fans On Front Panel LED Does Not Come On 1 Observe the blinking pattern on health LED see chart on page 3 9 and troubleshoot the indicated problem 2 The problem power supply is most likely the center 5 VDC supply See Troubleshooting the Low Voltage Power Supplies on page 4 17 3 Replace the front panel see page 8 5 4 Replace the front panel cable see page 8 5
209. ection Go to ADC Output check under adjustments and calibration Toner Waste Cartridge Waste Cartridge presence is H Waste Cartridge full is L All door switches must be closed H Present or full L Not present or not full Tray Sensors Tray 2 Do you want auto media lift Yes No Tray 2 SW1 4 HHHL Letter Level H NoPaper L Tray 3 same as tray 2 Tray 4 no data available if HCF is installed Tray 5 same as tray 3 4 The four switch pattern indicates the media size Refer to the media Switch table in the Wiring Diagrams chapter of this manual L Tray not lifted H Tray lifted H Paper not present L Paper present NOTE Level 6 entries for Trays 3 5 follow the same pattern as for Tray 2 Tray1 MPT Sensors MPT No Paper is L MPT size is XXX MPT Multi Purpose Tray Range 0 1000 i e Letter LEF approx 180 i e Letter SEF approx 460 HCF LTD Sensors No HCF Attached or HCF Path 1 is L HCF Path 2 is L High Capacity Feeder ATC Sensor 1 is nnn ATC Automatic Toner Calibration ATC 2is nnn Value range 0 1000 ATC 3is nnn ATC 4is nnn Imaging Unit Imaging Unit Yellow is H H Cartridge present Sensors Imaging Unit Magenta is H L No cartridge present Imaging Unit Cyan is H Imaging Unit Black is H New Toner Cartridge Sensor General Troubleshooting 4 7 Test Front Panel Display Test Operatio
210. eder Assembly and Paper Lift Motor Remove the Left Hand Lower Cover Assembly Open Tray halfway Disconnect the wiring harness A a Remove the 2 screws holding the Tray 1 feeder assembly not the screws securing the lower tray bracket Remove the Tray 1 feeder assembly 6 Some manipulation may be required to disengage the gears Removal of Motor 1 Disconnect the wiring harness from the motor 2 Remove the two screws securing the motor to the feeder bracket 3 Lift the motor straight out of the bracket to clear the gear on the motor shaft 7150 125 Note When reinstalling the motor it may be necessary to manually rotate the gears to mesh them with the other gears Service Parts Disassembly 6 17 Waste Cartridge Sensor Holder 1 Open the front door 2 Open the waste cartridge cover Note To avoid a toner spill use care in removing the waste cartridge 1 Remove the waste cartridge 2 Remove screw securing the waste cartridge pivot hinge and remove the hinge and cover 3 Remove the waste cartridge sensor holder disconnecting wire harnesses if necessary to replace the sensor Waste Cartridge Cover Waste Cartridge Cartridge Sensor Holder 7750 129 8 18 Phaser 7750 Printer Service Manual Imaging Unit Plate Cover Open the front door Remove fuser front cover Lower the main lever Slide imaging units 1 and 3 out sl
211. emove the rear cover and rear shield Replace the Replace the 2 Reconnect power and enter service engine control transfer roller diagnostics 3 Measure the voltage at the engine control board J533B9 while running the 2nd BTR Motor test several times 4 Does the voltage toggle between 5 VDC and 0 VDC when the test is running board retract sensor Error Messages and Codes 3 17 1st BTR Contact or Retract Failure Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Retract Sensor and Harness Accumulator Belt Assembly Troubleshooting Procedure Step Actions and Questions Yes No 1 Is the retract sensor or actuator damaged Repair or reseat Go to step 2 or out of position the sensor 2 1 Run the 1st BTR motor contact retract Replace the Go to step 3 test in diagnostics accumulator belt 2 Do the 1st BTRs contact and retract assembly 3 1 Run the 1st BTR retract sensor test Go to the Replace the 2 Does the status change between H transmissive accumulator belt and L sensor procedure assembly 3 18 Phaser 7750 Printer Service Manual Accumulator Belt Home Position Took Too Long Code 30 Accumulator Belt Home Position Failure Code 31 The accumulator belt home sensor did not detect the belt home signal Note If this failure reoccurs three times successively an Engine NVRAM value is set preventing further printer use
212. ency Disconnect the power plug by pulling the plug not the cord Disconnect the power cord in the following cases ifthe power cord or plug is frayed or otherwise damaged if any liquid or foreign material is spilled into the case if the printer is exposed to any excess moisture if the printer is dropped or damaged if you suspect that the product needs servicing or repair whenever you clean the product Service Manual y Electrostatic Discharge ESD Precautions Some semiconductor components and the respective sub assemblies that contain them are vulnerable to damage by Electrostatic discharge ESD These components include Integrated Circuits ICs Large Scale Integrated circuits LSIs field effect transistors and other semiconductor chip components The following techniques will reduce the occurrence of component damage caused by static electricity Be sure the power is off to the chassis or circuit board and observe all other safety precautions Immediately before handling any semiconductor components assemblies drain the electrostatic charge from your body This can be accomplished by touching an earth ground source or by wearing a wrist strap device connected to an earth ground source Wearing a wrist strap will also prevent accumulation of additional bodily static charges Be sure to remove the wrist strap before applying power to the unit under test to avoid potential shock m After removing a static sensi
213. engine NVRAM restore function Adjustments and Calibrations 6 15 Resetting NVRAM Resetting NVRAM returns all the image processor s NVRAM stored parameters to their factory defaults except the print counts and the Adobe firmware serial number You can reset both the PostScript and engine NVRAM using the PostScript Menu or the Service Diagnostics Menu PostScript NVRAM Resets Restore Factory Settings Color You can reset settings for density and color balance to the factory default values 1 From the Main Menu highlight Printer Setup and press OK 2 Highlight Calibration Setup and press OK Note An alternate access pathway from the Main Menu is Troubleshooting Print Quality Problems 3 Highlight Calibrate Colors and press OK 4 Highlight Restore Factory Settings and press OK 5 Highlight Restore Factory Settings NOW and press the OK to reset the color settings to factory defaults Restore Previous Settings Color You can return the color settings to the ones that existed before you saved the last color balance adjustments 1 From the Main Menu highlight Printer Setup and press OK 2 Highlight Calibration Setup and press OK Note An alternate access pathway from the Main Menu is Troubleshooting Print Quality Problems 3 Highlight Calibrate Colors and press OK 4 Highlight Restore Previous Settings and press OK 5 Highlight Restore Previous Settings NOW and press OK to restore the previous color se
214. engine control board Go to step 5 1 While still in diagnostics pull out tray 2 2 Does SW1 4 indicate LLLL Replace in order until resolved m paper select switch assembly m engine interface board m engine control board Go to step 6 Error Messages and Codes 3 41 Troubleshooting Procedure Step Actions and Questions Yes No 6 1 Reseat the paper tray Replace the paper Replace in order 2 Does SW1 4 indicate H in any feed motor until resolved position m paper select switch assembly m engine interface board m engine control board 7 1 Pull out and then reseat the problem Go to step 8 Go to step 9 tray 2 Listen for the motor does the lift motor operate 8 1 Did the Error Code 87 clear from the Complete This Replace the front panel could be an engine control intermittent board problem If the problem returns replace in order m tray level sensor m engine interface board 9 1 Using service diagnostics check the Replace in order Go to step 10 level sensor and no paper sensor until resolved 2 Does the level indicate H m tray level sensor m no paper sensor m LTA or HCF control board engine interface board engine control board 10 1 While still in diagnostics pull out tray 2 Replace in order Go to step 11 2 Does SW 3 4 5 4 indicate LLLL until resolved m paper select Switch assembly m engine interface board m engine control boa
215. ent Procedure Note Ensure the developer assemblies are fully and evenly seated when reinstalling the imaging unit plate assembly There is a locating pin at the back of each developer housing assembly Lightly tug the wires to ensure that they are not pinched by the plate or developers while reinstalling Center the connectors flat against the wire guide with the yellow developer connector further to the right Caution Be very careful not to catch any of the wires on the left hand side of the plate while re installing There are two locating holes in the imaging unit plate assembly that correspond to locating pins on the frame of the printer Failure to align the holes with the pins prior to tightening screws could result in bending the plate Imaging Unit Rail Assembly 1 Remove the waste cartridge 2 Remove the imaging units and protect them from light 3 Remove the imaging unit plate cover see page 8 22 4 Raise the main lever and loosen but do not remove the screw holding the front rail retaining bracket 5 Disconnect the erase lamp 6 Lower the main lever bias the front rail retaining bracket towards the front of the printer and then remove the rail 7 When installing the replacement rail make sure both tabs are in the slots in the front and rear mounting brackets 8 24 Phaser 7750 Printer Service Manual Developer Housing Assembly Note Complete removal of the imaging unit plate assembly is not required for
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217. eristic Specification Printing process The Phaser 7750 printer uses lasers with an electrophotographic four color CMYK single pass print process Color medium Four color toner cartridges Cyan Yellow Magenta and Black EAHG Toner Resolution Print Modes Standard 1200 x 600 dpi OHP 1200 x 600 dpi Enhanced 1200 x 1200 dpi Photo 1200 x 1200 x 1 bit under color First Page Out Letter A4 lt 11 seconds color lt 10 seconds monochrome Warm up time Warm up time to Ready from power on or ENERGY STAR 40 seconds First page out from Ready 7 4 seconds mono 6 7 seconds color Print Speeds Ltr A4 Tab A3 Speeds Ltr A4 Duplex Tab A3 Duplex Standard 1200 x 600 dpi 35 28 17 13 13 Photo 1200 x 1200 dpi 22 18 11 8 OHP 8 N A N A N A Card 11 N A 9 N A Labels N A N A Electrical Specifications Characteristic Specification Primary line voltages 115 127 VAC 10A 200 240 VAC 5 Frequency range 50 60 Hz 3 Hz Power consumption Power saver 45 watts Standby 130 watts Ready 220 watts Continuous Printing 220 to 600 watts average Peak warming up 1100 watts 1 12 Phaser 7750 Printer Service Manual Environmental Specifications Characteristic Specification Temperature Operating 10 to 32 C Storage 20 to 50 C Humidity Normal operating 10 to 85 relative humidity Optimum operating 25 75 Altitude 0 to 2500 m 8000 ft
218. ervice Manual LTD HCF Feeder Paper Feed Motor Assembly Remove the left hand cover Open the tray halfway Disconnect the wiring harness A a Remove the 2 screws holding the Tray 2 feeder assembly not the screws securing the lower tray bracket Remove the tray feeder assembly 6 Some manipulation may be required to disengage the gears Removal of Motor Disconnect the wiring harness from the motor Remove the 2 screws securing the motor to the feeder bracket Lift the motor straight out of the bracket to clear the gear on the motor shaft a When reinstalling the motor it may be necessary to manually rotate the gears to mesh them with the other gears Paper Feed Motor Assembly Trays 3 amp 4 HCF Trays 3 4 amp 5b LTD Chute to Lower 7150 163 Service Parts Disassembly 6 61 Bracket Assembly Left Hand and Right Hand Gear HCF 1 Remove the rear cover 2 Remove the 2 screws securing the bracket assembly Gear RH 2 or Gear LH 1 to the frame 3 Remove the bracket assembly Replacement Procedures Note There are locating pins for each bracket 7750 221 8 62 Phaser 7750 Printer Service Manual Service Parts Lists In this chapter Serial Number Format Using the Parts List m Hardware Kits m Recommended Service Tools Chapter Serial Number Format Changes to Xerox products
219. eshooting 4 9 Test Front Panel Display Test Operation Definition Offset Motor Direction Forward Backward Press Up Down to change setting Color Developer Motor Developer Motor is On Turn Motor Off Developer Motor All Motors Off Dispensor Motor Disp Motor Yellow NOTE Only run this test once per Magenta power cycle to avoid Cyan excessive toner being y forced inside the developer Black and destroying it Agitator Motor Motor On Press OK to run test Motor Off Fans Fuser LVPS Rear Press Up Down to change setting Fan is On Turn Motor Off All Motors Off Paper Path No Pick NoPaperRun Init Runs a complete print cycle only No paper is picked and no toner is dispensed Finisher Motors Optional Optional Miscellaneous Main Eject Forward Eject Release Stacker Motor Up Motor Down Tamper Rear Tamper Low Front Rear Tamper Middle Front Rear Tamper High Front Rear Tamper Low Rear Rear Tamper Middle Rear Rear Tamper High Rear Front Tamper Low Front Front Tamper Middle Front Front Tamper High Front Front Tamper Low Rear Front Tamper Middle Rear Front Tamper High Rear Stapler Close Reverse Move Front Move Rear Press Up Down to change setting 4 10 Phaser 7750 Printer Service Manual Test Front Panel Display Test Operation Definition Clutch Tests Tests fun ctionality of clutches by activating one clutch at a time All
220. face through a system of mirrors and lenses A rotating polygonal mirror causes the laser beams to scan the drum surface from end to end axially as it rotates The beams are turned on to print a pixel and off when no printing is required The negative charge on the drum surface is reduced at each point where the energized laser beam strikes to form an electrostatic latent image on the drum surface This process is performed simultaneously for YMCK 3 Development Toner is electrostatically attracted to the invisible latent image on the drum surface to form the visible image on the drum Toner is fed into the developer using the agitator and auger The toner and the carrier in the developer form a layer on the magnet roller in the developer The magnet roller turns against the surface of the drum and is kept at a constant negative potential At areas on the drum surface where the negative charge has not been reduced by the laser light potential between the drum and the toner particles is lower than that between the magnet roller and the toner particles At areas where the drum charge has been reduced the potential between the particles and drum is higher than between the magnet roller and toner particles are attracted to the drum A thin semiconductive sleeve on the magnet roller is vibrated by an AC voltage to encourage migration of the toner particles to the drum When the toner particles attach to the drum the negative charge of the particles red
221. facts parallel to the short axis of the print Leading Edge 3041 43 1 Inspect the paper that is loaded in the paper tray Is the paper wrinkled dimpled or show any signs of having a high moisture content 2 Does the band repeat at a specific interval If so troubleshoot using the Repeating Defects 3 Run the Remove Print Smears routine From the front panel s Troubleshooting Menu select Print Quality Problems then select Remove Print Smears 4 If the engine test prints are all okay but prints from an application or the image processor board are not replace the image processor board 5 18 Phaser 7750 Printer Service Manual Banding 3041 44 Print the Repeating Defects Pages Replace the unit of the affected color using the repeating defects page If the defect still appears in the same color the problem is the developer A a If all colors the problem is with the accumulator belt belt cleaner transfer roller or fuser Random Spotting 3041 47 There are spots of toner randomly scattered across the page The printer displays no error code Single Color 1 Inspect the toner cartridge for toner clumping 2 Check the imaging units All Colors 1 Inspect the paper path 2 Inspect the accumulator belt cleaner and replace if necessary 3 Inspect the transfer roller and replace if necessary
222. failure mode The chain link is used to identify or address a specific component within the printer The chain points to a counter or component assembly and the link points to a specific item in that assembly All chain link codes and their respective definitions can be found in the Appendix under Missing Chain Link Codes Definitions on page A 11 Using the Troubleshooting Procedures 1 Each Step in a troubleshooting procedure instructs you to perform a certain action or test The steps are to be followed in the order given until the problem is fixed or resolved 2 The Actions and Questions box contains the procedures to perform and the resulting actions you must follow to isolate the problem When a procedure instructs you to test a component using service diagnostics go to the Service Diagnostic Tests Table on page 4 3 for a detailed description for testing printer components Troubleshooting procedures may ask you to take voltage readings or test for continuity at certain test points within the printer For detailed diagrams see Wiring Diagrams on page 10 1 for complete information on test point locations and signal names 3 The Actions are followed by a Question If your response to the question is Yes then follow the instructions for the Yes reply If your response to the question is No then follow the instructions for the No reply 4 The problem will be isolated to an adjustment calib
223. g harness Cyan P J 131 2 Is the wiring harness or the sensor defective 4 1 Remove the Rear Cover and Rear Replace the Go to step 5 Shield engine control 2 Measure the voltage at board Yellow P405B3 Magenta P405B8 Cyan P405A10 on the engine control board 3 Is the voltage between 1 3 VDC 5 1 Measure the voltage at Replace the Go to step 6 Yellow P405B14 Magenta P405B11 Cyan P405A11 on the engine control board 2 Is the voltage 5 VDC engine control board Error Messages and Codes 3 13 Troubleshooting Procedure Continued Step Actions and Questions Yes No 6 1 Measure the voltage at Replace the Go to step 7 Yellow P405B2 engine control Magenta P405B9 board Cyan P405A9 on the engine control board 2 Is the voltage 0 VDC 7 1 Remove the Imaging Unit Plate cover Replace the wiring Replace the ATC 2 Inspect the wiring harness between harness Sensor the engine control board and the developer housing assembly 3 15 the wiring harness defective 8 Run approximately 10 pages of the solid fill full page prints for this color to ensure the error is cleared 3 14 Phaser 7750 Printer Service Manual Black ATC Sensor Failure Code 15 The ATC Sensor detects an insufficient amount of developer Note If this failure reoccurs three times successively an Engine NVRAM value is set preventing further printer use until the
224. haser 7750 Printer Service Manual Solid Fill Pages Selecting Solid Fill Pages causes a group of six pages as shown below to print that consist of 80 solid fill on individual pages of CMYK for primary colors and BG for secondary E 7750 182 Print Quality Troubleshooting 5 7 Repeating Defects Page The Repeating Defects Page provides a measurement tool that allows you to match the spacing between repeated defects on the printed pages with the component that would cause such spacing to occur Instructions for using the Repeating Defects Page are printed on the page Match a set of repeating defects in your print to the corresponding marks on the appropriate vertical line This line indicates the item such as the transfer roller causing the defect Note The repeating defect must be measured accurately to ensure the correct item is replaced For example the distance between these two marks represents a defect repeating every 44 mm this is caused by an imaging unit When correcting a repeating defect by replacing a routine maintenance item follow the instructions included with the routine maintenance item To diagnose a defect on the PEN accumulator belt 1 Print eight A size pages long edge feed Verify that the same defect appears on every fourth page 2 Print four B size pages Verify that the s
225. he Image processor board IP board cover and metal cover 4 Inspect the orange ribbon cable between the relay board and the engine control board 5 15 the connector fully seated and free from damage Replace in the following order m Image processor board m Electrical chassis assembly m Engine control board Engine Logic Board RAM ROM Failure Code 82 Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Cycle power to the printer to clear the Complete Replace the error engine control 2 Didthis clear the error board Error Messages and Codes 3 39 Engine Logic Board NVRAM Failure Code 83 Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Cycle power to the printer to clear the Complete error 2 Didthis clear the error Replace in the following order m engine control board m image processor board Controller to Engine Logic Board Time Failure Code 84 Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Cycle power to the printer to clear the Complete Replace the error 2 Didthis clear the error engine control board Engine Logic Board Micro Pitch Failure Code 85 Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Cycle power to the printer to clear the Complete error 2 Didthis clear the error Replace in the following order m engine control
226. he Print to the Following Port list is identical to the one on the Configuration Page You may need to click the Configure Port button to view the IP address If necessary re select the TCP IP number used for your printer Printing a Test Page 1 Click the General tab 2 Click Print Test Page If the printer does not print do one of the following Select PhaserSMART Technical Support on the Troubleshooting tab of your Windows printer driver to access PhaserSsMART Technical Support W Go to www xerox com office support Windows 98 and Windows Me Troubleshooting This troubleshooting section assumes you have completed the following tasks Verified that the printer is plugged in turned on and connected to an active network W Installed a Phaser printer PCL or PostScript print driver General Troubleshooting 4 25 Verified that the printer is receiving network traffic by monitoring the LED s on the back of the printer or on the CentreDirect External Print Server When the printer is connected to a functioning network and receiving traffic its link LED is green and its amber traffic LED is flashing rapidly Printed and kept a current copy of the Configuration Page For information about using the front panel or printing a Configuration Page go to Reference Features Front Panel on the User Documentation CD ROM Verifying Settings 1 Right click Network Neighborhood on the desktop then click Properties
227. he two locking tabs located at the top of the sensor press up on the two locking tabs at the bottom of the sensor and remove the sensor 11 19 Stacker Paper Sensor Assembly 57700 329 57700 374 Loosen the thumb screw remove the stacker tray Remove the 4 screws securing the stacker paper sensor assembly to the finisher Remove 2 screws from the bottom of the assembly Remove 1 screw on the sensor bracket a Q N Press down on the two locking tabs located at the top of the sensor press up on the two locking tabs at the bottom of the sensor and remove the sensor 6 Remove the connector from the sensor 11 20 Phaser 7750 Printer Service Manual Set Clamp Clutch and Gear 57700 335 Remove the rear cover see page 11 17 Remove the set clamp actuator Remove screw from the set clamp actuator retainer and remove Remove the clutch collar and clutch a a Remove the gear Note When replacing after installing the clutch collar you need to depress the clutch solenoid and rotate the set clamp shaft 1 4 revolution Counter Clockwise Then install the set clamp actuator Then rotate the clutch until the solenoid snaps into position 11 21 Eject Roll Assembly 7700 333 Remove the rear and left covers see page 11 17 Remove sack paper sensor assembly see page 11 20 Undo the intermediate connector Remove the right cover Remove the set camp
228. her Eject Clamp home sensor on off failure code 120 121 3 58 Finisher Sensors diagnostic tests 4 8 Finisher Set Clamp failure code 123 3 60 Finisher Stacker Height Sensor off failure code 116 3 53 Finisher Stacker Tray failure code 117 3 55 Finisher Stapler Index 3 failure code 113 3 49 front corner on off failure code 118 119 3 57 mode logic failure code 125 3 61 move sensor on off failure code 111 112 3 47 front panel adjust diagnostics 4 3 configuration 1 6 disassembly 8 5 key shortcuts 1 6 keys 1 6 LED indicators 1 6 troubleshooting 4 14 functional specifications 1 12 Fuser diagnostic temperature 4 3 life expectancy 2 8 main lamp failure code 40 3 25 paper path 2 8 SSR2 on time failure code 47 3 31 STS front failure code 41 3 26 STS front warm time failure code 42 3 26 STS rear failure code 45 3 30 STS rear warm time failure code 46 3 31 sub lamp failure code 44 3 29 theory of 2 8 Fuser Exit Sensor diagnostic test 4 6 Fuser Fan disassembly 8 32 Fuser Fan Motor diagnostic test 4 10 Fuser jams troubleshooting 4 22 Fuser Present Sensor diagnostic test 4 6 Fuser Temperature Sensor diagnostic test 4 5 fusing 2 3 H Hard Drive 6 15 Phaser 7750 Printer Sensor diagnostic test 4 7 HCF LTA Cover disassembly 8 58 Image Processor Board board diagram 1 7 connections 1 7 disassembly 8 38 Imaging Unit communications failure
229. ialization POST Faults There are two kinds of faults soft and hard A soft fault is any fault that is discovered by POST but does not prevent the operating system from initializing and becoming available as a tool for troubleshooting These POST faults do not stop execution and are reported on the StartPage in a red box after the system is running A hard fault is any fault discovered by POST that prevents the operating system from initializing successfully A hard fault prevents the system from further execution and is halted with blinking LEDs front panel and health LED The test name of the test that failed is displayed on the front panel Hard Fault Reporting Devices W The health LED flashes according to the fault code m A Vx Works text string is printed out the serial port The front panel LED flashes in unison with the health LED The last fault message posted to the front panel is present Note All soft faults are printed on the Startup Page POST Fault Reporting LED Blink Patterns For faults identified as hard faults the POST firmware causes the PS health LED and front panel LED to blink in a particular pattern to identify the fault There are short and long blinks A long blink is worth 5 and a short blink is worth 1 If a fault blink pattern is flashed as long long short short this is fault code 5 5 1 1 12 which indicates a failure in the CPU interrupt test The exception to the above pattern
230. ice RIP Every Call Procedures These procedures are to be used for every service call 1 2 ON o 11 12 3 4 Print an error log then diagnose and repair any problems as indicated Print a Usage Profile report then diagnose and repair any problems as indicated Check the cleanliness of the interior and exterior of the printer including fans Clean dust or vacuum these areas Check the versions of Engine and Postscript software As appropriate install the latest version of software Inspect the fuser assembly and clean if necessary Inspect the MOB and ADC sensors clean if necessary Inspect the accumulator belt home sensor clean if necessary Clean feed rollers and exit rollers only when dust or debris is visible Clean the laser scanner windows Review the proper operation of the printer with the customer emphasizing calibrate for paper color calibration and setting the paper type correctly Have the customer make enough prints to verify any repairs that were done Review with the customer all work that was done Phaser 7750 Printer Service Manual Overview for Troubleshooting Error Codes Definition of the Chain Link Codes A chain link is a numeric code represented as a pair with the chain first and the link second The chain is a 2 digit identifier representing a major or higher level sub assembly The link is a 3 digit identifier representing a specific
231. ight Sensor Assembly 12 1 Actuator 13 Bracket 14 116 1253 00 1 Stack Height Sensor 15 Shaft 16 Link 17 116 1264 00 1 Actuator 18 116 1258 00 Clutch 19 Collar 20 116 1848 00 1 Gear 282 part of a kit 21 Eject Roll 22 116 1848 00 1 Gear 20T part of a kit 23 Bearing 24 Eject Shaft 25 116 1302 00 1 Eject Roll Assembly 26 Link 27 Static Eliminator 28 Collar 11 51 PL 17 7 Paper Transport 1 of 2 PL17 7 BE 6 87750 410 11 52 Phaser 7750 Printer Service Manual Paper Transport 1 of 2 PL 17 7 No Part Number Qty Description 1 116 1248 00 1 Actuator Cam 2 116 1249 00 1 Clutch Assembly Decurler Cam 3 Cam 4 Shaft 5 Bearing 6 116 1250 00 1 Arm 7 116 1302 00 1 Decurler Roll 8 116 1847 00 1 Gear 402 20T part of a kit 9 116 1847 00 1 Gear 402 part of a kit 10 116 1847 00 1 Gear 187 21 part of a kit 11 Shaft 12 Bearing 13 116 1847 00 1 Gear 232 527 part of a kit 14 116 1265 00 1 Belt 15 116 1242 00 1 Belt 16 116 1241 00 1 Finisher Drive Motor 17 Bracket 11 53 PL 17 8 Paper Transport 2 of 2 PL17 8 1 2 12 14 19 87750 411 11 54 Phaser 7750 Printer Service Manual Paper Transport 2 of 2 PL 17 8 No Part Number Qty Description 1 116 1266 00 1 Cam Bracket Assembly 2 116 1847
232. ight Side Cover 1 Open the front cover 2 Remove 3 screws 1 screw is located behind the right hand door 3 Lightly press downward to release the four hidden tabs behind the right side cover then pull the cover away from the printer Right Hand Door Tabs 4x Finisher 57700 033 8 4 Phaser 7750 Printer Service Manual Top Cover and Front Panel Remove the right side cover see page 8 4 Remove 2 screws visible on the right side of the top cover Open the front cover and remove 1 front screw holding the top cover OD Remove the plastic access cover then remove the image processor board metal cover and disconnect the front panel cable from the Relay Board P564 5 Remove the top cover 5700 078 Front Panel Removal 1 Open the front door 2 Release the front panel assembly by inserting a screwdriver or button into the two access holes indicated in the illustration and push the tabs inward to release 3 Lift up the panel slightly and unplug the cable connected to the front panel 4 Release the two tabs on the left hand end of the front panel assembly and remove Access Holes 57700 270 Service Parts Disassembly 8 5 Rear Cover 1 If an auxiliary feeder has been installed open the auxiliary feeder connection cover and disconnect the auxiliary feeder wiring harness before removing the rear cover 2 Remove 4 screws securing the rear cover to the printer
233. ight click Local Area Connection then click Properties 3 Click the General tab View the list of installed network protocols to verify that TCP IP is installed For more information contact your network administrator Click Install to install any components not listed then restart your computer Click Start click Settings then click Printers Right click the printer icon then click Properties Click the Advanced tab Verify that the correct printer driver is installed Click the Ports tab Verify that the IP Address in the Print to the Following Ports list is identical to the one on the Configuration Page You may need to click the Configure Port button to see the IP address If necessary re select the TCP IP number used for the printer Oo Printing a Test Page 1 Click the General tab 2 Click Print Test Page If the printer does not print do one of the following m Select PhaserSMART Technical Support the Troubleshooting tab of your Windows printer driver to access PhaserSMART Technical Support m Go to www xerox com office support Windows NT 4 x Troubleshooting TCP IP This troubleshooting section assumes you have completed the following tasks Loaded a Phaser printer PCL PostScript printer driver W Printed and kept a current copy of the Configuration Page For information about printing a Configuration Page go to Reference Features Front Panel on the User Documentati
234. ightly Remove 4 black screws oar WN Remove the plastic imaging unit plate cover 7750 244 Service Parts Disassembly 8 19 Dispense Assembly Note Use only a type toner vacuum to clean up toner spills Have a drop cloth available to place the removed assemblies on Caution The dispense assemblies overlap and must be removed in the following order C then reinstalled C M Y Use a piece of wide tape to cover the toner access hole Close Shut Off Gate 7750 168 1 Open the Front Door 2 Remove the Imaging Units as necessary Note Cover the exposed opening with a wide piece of tape to avoid spillage The tape will not stick unless all toner is cleaned off the dispenser first Do not overlap the tape to the base plate located behind the opening 3 Remove the imaging unit plate cover 4 Leave the main lever down 8 20 Phaser 7750 Printer Service Manual 5 Pull the shut off gate of each toner cartridge toward you approximately 3 4 or 20mm to shut off the toner supply for each toner tube see Figure 8 26 Dispense Assembly on page 8 29 Caution Be careful when moving the stops they are easily broken and may come out completely 6 Remove the screw holding each dispense assembly to the printer 7 Remove the dispense assembly by pulling both the top and bottom sections evenly away from the printer Caution The flexible tubing is
235. ilter PWB Delay PWB FS62 Map 18 15 AC Drive PWB Noise Filter PWB Delay PWB FS68 Map 9 15 Toner Dispense Motor Y M C K Main Switch FS69 Map 9 16 Toner Dispense Motor Y M C K Main Switch FS76 Map 18 13 AC Drive PWB Noise Filter PWB Delay PWB FS77 Map 18 17 AC Drive PWB Noise Filter PWB Delay PWB 10 8 Phaser 7750 Printer Service Manual Plug Jack Map Number Item No mig FS90 Map 18 18 AC Drive PWB Noise Filter PWB Delay PWB FS134 Map 1 13 Xerographic FS135 Map 1 14 Xerographic FS180 Map 9 19 Toner Dispense Motor Y M C K Main Switch FS181 Map 9 1 Toner Dispense Motor Y M C K Main Switch FS182 Map 9 2 Toner Dispense Motor Y M C K Main Switch FS183 Map 9 3 Toner Dispense Motor Y M C K Main Switch FS184 Map 9 4 Toner Dispense Motor Y M C K Main Switch FS185 Map 9 5 Toner Dispense Motor Y M C K Main Switch FS186 Map 9 6 Toner Dispense Motor Y M C K Main Switch FS187 Map 9 7 Toner Dispense Motor Y M C K Main Switch FS812 Map 20 1 TT Module Tray 3 4 feeder FS813 Map 20 2 TT Module Tray 3 4 feeder 10 9 Plug Jack Locator Maps Map 1 P J224 P J223 P J233 P J171 P J225 P J132 P J131 P J619 P J608 P J602 P J631 P J622 P J134 7150 062 10 10 Phaser 7750 Printer Service Manual 10 11 Map 3 Inverter Transport INVERTER TRANSPORT ASSEMBLY P J102 P J113 2 7 J612 P J111
236. in Replace the wiring Go to step 4 2 and engine control board Pin 8 harness 2 Is there a short 4 1 Is there 5 VDC between sensor Pin2 Go to step 6 Go to step 5 and ground 5 1 Check the wiring between sensor Pin 2 Replace the Repair or replace and engine control board Pin 8 foran affected board the wiring open or poor circuit harness 2 Is the wiring OK 6 1 Check the wiring to Pin 4 and sensor Replace the Replace the Pin 1 and Pin 5 to sensor Pin 3foran affected board wiring harness open or poor circuit 2 Is the wiring OK 3 46 Phaser 7750 Printer Service Manual Finisher Stapler Move Sensor On Failure Code 111 Finisher Stapler Move Sensor Off Failure Code 112 Error Code 111 The staple move sensor did not turn ON within 2 seconds after the system has started to move to the staple position and the staple move sensor has turned off Or the staple move sensor did not turn on after the move to the staple position has completed Error Code 112 The staple move sensor does not turn OFF within 5 seconds after the move to the staple position has started Or the staple move sensor turned OFF after the staple position has been fixed Or the staple move sensor does not turn OFF within 5 seconds after it has turned ON when the paper passed through the Ist position of the dual staple moving to the rear staple position Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Fi
237. ine maintenance items and toner cartridges are installed All trays and Tray 1 have paper in them No paper is in the paper path or Finisher The Finisher is docked correctly to the printer m No motor tests have been performed to change the position of any components m The waste cartridge is not full Ambient Temp Humidity Temperature is XX C Humidity is XX Fuser Temperature Front Temp is XX C Back Temp is XX Interlocks Front or Right Door is L A Left Upper Door L D Duplex Cover is L B Left Lower Door is L C Optional Tray Left Cover L H Open L Closed NOTE Only one door can be open at a time to run this test General Troubleshooting 4 5 Test Front Panel Display Test Operation Definition Jam Sensors LH Low Cover Area is L LH Cover Area is L LH Fuser Area is L Duplex Cover Area is L Tray Left Cover Area is L Tray 3 Area is L Tray 4 Area is L Tray 5 Area is L F Fin Compiler Cover Area L G Fin Compiler Safety Area L H J Fin Front Cover Area is L Fin Hor Tran Area is L Fin Docking Area is L H Paper present L Paper not present This is the FIN IN GATE This is the FIN HOR TRANS This is the FIN EJECT POB Sensor POB Sensor is H Paper on Belt Sensor L Paper present H Paper not present Registration Sensor Registration Sensor is H L Paper present H Paper not present
238. ins the improper spelling Course 6 10 Phaser 7750 Printer Service Manual 4 Wait until the test results are displayed as follows Course Skew Setup Passed Min A Blocks 0 Min B Blocks 4 Yellow 40 Click CW Magenta 47 Clicks CW Cyan 47 Clicks CW Black 46 Clicks CW Note If the block counts are not the same number as presented here the printer has a print quality problem See Streaks in Direction of Paper Travel on page 5 17 to resolve the print quality problems before proceeding further with RegiCon If RegiCon Coarse Skew Fails This indicates that the horizontal alignment is so far out of adjustment that a manual adjustment is required before the diagnostics test routines for fine skew can pass Other possible problems a Mark On Belt Sensor failure Developer Developer Bias Voltage Imaging Unit or Engine Control Board Failure Perform the Coarse RegiCon Initialization page 6 12 This adjusts the horizontal alignment closer and allows RegiCon 4 to pass m After Coarse RegiCon Initialization is complete perform RegiCon 4 Coarse Skew Adjustment again Make the required adjustments Adjustments should be made only if the skew correction indicated is greater than five clicks Adjustment screws are located behind the waste cartridge which must be removed for access From left to right the adjustment screws are K C M and Y Adjustments and Calibrations 6 11 Coarse RegiCon Initialization
239. ipt NVRAM Reset 6 16 diagnostics 4 12 power AC and DC 2 10 Power Interlock Switching wiring diagram 10 37 Power Supply system theory of 2 13 primary transfer 2 2 Print Cartridge Motor diagnostic test 4 9 print process Phaser 7750 Printer summary of 2 2 print quality overview 5 2 print quality defects specific components 5 2 print speeds 1 12 printer configurations 1 3 dimensions and clearances 1 9 electrical specs 1 12 environmental specs 1 13 exterior parts 1 4 functional spec 1 12 general troubleshooting 4 15 media specs 1 13 print speeds 1 12 specifications 1 9 start up 3 7 tray specs 1 13 printer maintenance 7 1 printer orientation 8 2 R Read Fuser Fuses Sensor diagnostic test 4 6 Rear Cover disassembly 8 6 Regicon center skew 3 6 9 coarse initialization 6 12 coarse skew 4 6 10 fine skew 1 6 7 in out skew 2 6 8 overview 2 17 patterns 2 20 theory of 2 15 Registration wiring diagram 10 58 Registration Clutch diagnostic test 4 11 Registration Control Regicon 6 2 Registration Sensor diagnostic test 4 6 Registration Transport Assembly disassembly 8 15 Index 6 Reset Engine NVRAM diagnostics 4 12 resetting all printer defaults 6 17 clear tech rep faults 6 20 factory settings 6 16 NVRAM 6 16 resetting NVRAM image processor 6 16 restore factory settings margins 6 17 previous color settings 6 16 Right Hand Lift Jack disassembly 8 55
240. is a RAM test error The RAM tests have a special blink pattern and the front panel displays RAM Error During power up the front panel LED is on If the RAM tests fail the image processor board health LED is turned off and the front panel LED is red At 1 2 second intervals the health LED and the front panel LED toggle continuously 3 8 Phaser 7750 Printer Service Manual POST Diagnostic Test Descriptions Fault Fault Test Type Code Description This test fails if the boot loader finds no RAM present or faulty RAM SDRAM Hard 1 Boot loader posts the message RAM error to the front panel and blinks the front panel LED and IP Board health LED Performed during the POST firmware initialization Local Bus Hard 2 phase Front Panel If the front panel is unplugged a hard fault is indicated by the heath LED This test determines if the I O chip is functioning 1 0 ASIC Hard 3 4 This test determines if the memory access function works at selected addresses This test checks to see if the configuration chip is Configuration Hard 5 present If no chip is present the test fails and the front Chip panel message Please Install configuration chip displays EEPROM Hard 10 This test checks addressing of the EEPROM Ethernet Hard 11 This test checks the ethernet core This test checks that each interrupt source to the CPU CPU Interrupts Hard 12 is functio
241. ity When the registration process is completed all color planes are positioned properly The RegiCon Adjustment procedures should be used whenever the technician replaces the Laser Unit or where color registration is bad The printer registration process consists of the following adjustments and is briefly summarized in this overview m Fine Skew Adjustment In Out Skew Adjustment Center Skew Adjustment m Coarse Skew Adjustment RegiCon is the procedure by which the printer aligns the magenta yellow and black vertical and horizontal scan lines to the cyan reference scan line Horizontal and vertical alignment ensures that the magenta yellow and black lines are superimposed on Cyan Note Cyan is the reference color to which all other colors are aligned Figure 1 Horizontal and Vertical Margins Cyan 87700 460 6 2 Phaser 7750 Printer Service Manual Coarse and Fine Skew Adjustments Skew error is the misalignment of one or more of the four scan lines C M Y amp K During the RegiCon 4 Coarse and RegiCon 1 Fine adjustments the front side of each line is adjusted to be level with the rear end Figure 2 Skew Adjustment ee 57700 461 In Out Skew Adjustment The In Out Skew Adjustment Magnification ensures that all four scan lines are the same length During RegiCon 2 the printer measures then adjusts the four scan lines to the proper length Figure 3
242. ive Logic Failure Code 34 Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Accumulator Belt Assembly m Engine Interface Board Engine Control Board Caution If the Accumulator Belt is damaged determine the cause of the damage before installing a new assembly Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Remove the accumulator belt Replace the Go to step 2 assembly accumulator belt 2 Inspect the connector for damage assembly 3 Is the connector damaged 2 Is the edge sensor actuator touching the Replace the Go to step 3 belt accumulator belt assembly 3 1 15 the mating connector inside the Repair or replace Go to step 4 printer damaged the wiring harness between the connector and J605 4 1 Reinstall the accumulator belt Go to step 5 Run the Belt assembly Edge Learn and 2 Enter service diagnostics and run the recheck If it still Belt Edge Sensor test fails go to step 8 3 Isthe result OK 5 1 Switch printer power ON Go to step 8 Go to step 6 2 Remove the rear cover and shield 3 Measure the voltage between the engine control interface board and J533A11 and frame ground 4 Does the voltage measure between 1 to 3 VDC 3 22 Phaser 7750 Printer Service Manual Troubleshooting Procedure Continued Step Actions and Questions Yes No 6 1 Measure the voltage between the Go to step
243. ive Paper Developer 7700 179 8 26 Phaser 7750 Printer Service Manual 1 Place the developer housing assembly new or used to be recharged on a drop cloth Caution During this procedure the developer housing assembly must be kept level at all times To prevent toner spillage it is recommended that the developer housing assembly be fully supported level by laying it on something like a large piece of cloth paper towels or styrofoam hollowed out for the developer housing assembly to lie on If new remove the protective cover over the magnetic roller Do not touch the magnetic roller Note The wires are routed under and behind the right snap tab 2 Release the snap tabs at each end of the developer housing assembly and remove the assembly cover 3 Agitate the package of developer mix and then cut it open Carefully pour the entire contents of developer mix as evenly as possible over the two augers Do not let the developer mix accumulate heavily on the roller Keep the developer housing assembly level 4 Reinstall the cover making sure that the rear tabs are all engaged in their respective slots while positioning the wire harness under the snap tab Press firmly until you hear a positive snap sound for each tab indicating each snap tab is securely fastened 5 Tear off the ATC sensor perforated tag Do NOT remove the ATC sensor label from the developer housing Peel off the protective backing and adhere the label to th
244. ks CCW Cyan 0 Clicks CW Black 0 Clicks CCW Note If the block counts are not the same number as presented here the printer has a print quality problem See Streaks in Direction of Paper Travel on page 5 17 to resolve the print quality problems before proceeding further with RegiCon 10 Using the back of the laser cleaning tool hook the loop of the MOB sensor just moved in step 3 above and pull it all the way to the front Continue holding the MOB Sensor in position while reinserting the securing screw removed in step 2 above When RegiCon 3 Fails This is probably due to the mark on belt sensor not being positioned properly assuming that RegiCon 1 and 2 tests have already passed The sensor has a wedge fit when in position for the number 3 center position If the mark on belt sensor not correctly positioned it can cause the test to fail Recheck the MOB sensor position and run the test again RegiCon 4 Coarse Skew Adjustment 1 From the Hidden Service menu highlight the RegiCon Setup Cycle menu and press OK 2 The first time any RegiCon test is requested the pages used to perform the test must be created so there is a short delay During this time the front panel displays Processing Data Please Wait 3 Highlight Do 4 Course Skew Setup and press OK The front panel now displays Testing Please Wait Note While the correct spelling for this test should be Coarse firmware currently conta
245. l K wiring diagram 10 60 Drum Life Control wiring diagram 10 61 Drum Motor failure code 60 3 35 Duplex Chute disassembly 8 13 Duplex Clutch diagnostic test 4 11 Duplex Gate Solenoid diagnostic test 4 11 Duplex Motor diagnostic test 4 9 Duplex Sensor diagnostic test 4 6 duplexing paper path 2 7 E Electrical Chassis Card Cage disassembly 8 40 electrical specifications 1 12 Engine control theory of 2 10 Engine Control Board communications failure code 81 3 39 controller to time failure code 84 3 40 disassembly 8 42 micro pitch failure code 85 3 40 NVRAM failure code 83 3 40 NVRAM failure code 86 3 40 RAM ROM failure code 82 3 39 Engine control board failure code 80 3 39 Engine Control Interface Board disassembly 8 43 Engine NVRAM reset 6 20 engine ROM version diagnostics 4 3 environmental specifications 1 13 Service Manual error messages index table 3 10 Exit Gate Solenoid diagnostic test 4 11 exit jams troubleshooting 4 22 Exit Transport disassembly 8 31 exposure 2 2 F Fan failure code 54 3 33 Fan Tests diagnostics 4 8 fault history accessing 3 2 service diagnostic 4 4 fault list diagnostics 4 3 fine skew theory of 2 19 Finisher Clutches diagnostic tests 4 11 communication failure code 124 3 61 motors diagnostic test 4 10 Solenoids diagnostic tests 4 11 troubleshooting 4 15 Finisher Decurler failure code 122 3 59 Finis
246. l the wire harness if the fuser fan and plastic mounting bracket are removed from the printer 5 Remove the 2 screws securing the fuser fan assembly and remove the assembly 6 Disconnect the wiring harness Locating Pin 7750 132 8 32 Phaser 7750 Printer Service Manual Accumulator Belt Mounting Frame Remove the accumulator belt assembly Remove the imaging units and protect from light Remove the imaging unit plate cover Remove the steering drive assembly Remove the fuser Remove the registration assembly oc fF WN Remove the mounting screws from the main drive assembly and push it 1 4 inch to the rear of the printer 8 Remove 4 black screws that mount the accumulator belt frame to the left hand lift jack 9 Remove the e clips and washers from the right hand lift jack roller guides 10 Remove the 4 black screws holding the right hand lift bracket to the Accumulator Belt Frame and remove the bracket 11 Remove the 1 screw holding the accumulator belt connector to the rear frame and move the harness out to the way 12 Remove the 2 screws holding the first bias transfer contacts to the rear frame and move them out of the way 13 Remove the guide studs on the front and rear of the printer 14 Unhook the erase lamps mounted on each guide rail and remove the guide rails 15 Raise the front handle 16 Lift the accumulator belt frame assembly as high as it goes and remove it fro
247. life counts if the assembly is replaced after receiving a Replace Belt Cleaner Assembly or Replace Belt Cleaner Assembly Soon message 1 From the Main Menu highlight Information and press OK 2 Highlight Supplies Info and press OK 3 Highlight Reset Belt Cleaner Assembly Life and press OK 4 Reset Reset Belt Cleaner Assembly Life NOW is displayed press OK to reset the Accumulator Belt Cleaner life Resetting Transfer Roller Life Resetting the transfer roller life is to be performed only if the transfer roller assembly is replaced before an end of life or near end of life message Do not to extend the life of the assembly Doing so may cause premature failure of other internal printer components 6 18 Phaser 7750 Printer Service Manual The printer prompts the user to reset the life counts if the assembly is replaced after receiving a Replace Transfer Roller or Replace Transfer Roller Soon message 1 From the Main Menu highlight Information and press OK 2 Highlight Supplies Info and press OK 3 4 Reset Transfer Roller Life NOW is displayed press OK to reset the Transfer Highlight Reset Transfer Roller Life and press OK Roller life Service Diagnostics NVRAM Resets PostScript NVRAM Reset Resetting the printer setup values resets the job defaults front panel language Intelligent Ready Tray 1 MPT tray 2 5 setup Startup Page front panel intensity front panel contrast PostScript error information and E
248. light by covering with a light proof bag or by placing in a light tight container Disconnect all computer interface cables from the printer 3 Wear an electrostatic discharge wrist strap to help prevent damage to the sensitive electronics of the printer circuit boards Caution Many parts are secured by plastic tabs DO NOT over Flex or force these parts Do not over torque the screws threaded into plastic parts Always use the correct type and size screw Using the wrong screw can damage tapped holes Do not use excessive force to either remove or install either a screw or a printer part When replacing a screw in plastic rotate it CCW until you feel it fall into the original threads then tighten the screw normally Note Names of parts that appear in the disassembly procedures may not be exactly the same as the names that appear in the Parts List For example a part called the Registration Chute Assembly may appear on the Parts List as Assembly Chute REGI Warning Unplug the AC power cord from the wall outlet before removing any printer part Notations in the Disassembly Text The notation item X points to a numbered callout in the illustration corresponding to the you disassembly procedure being performed The notation PLX X X indicates that this component is listed in the Parts List Bold arrows in an illustration show direction of movement when removing or replacing a component Service Parts Disassembly 6 3 Covers R
249. lled in the printer paper type in the front panel to the 3041 49 next lightest type of paper than what you are using If the colors are offset by only a small amount 10 mm maximum then calibration of the laser may be needed This is mis registration not ghosting Go to Image Mis Registered on Paper on page 5 26 If the ghosting is offset by 84 mm run the Remove Print Smears routine to clean the fuser From the front panel s Troubleshooting Menu select Print Quality Problems then select Remove Print Smears Inspect and replace the fuser if necessary Note Some ghosting may appear on transparency film and is a limitation of the printer Print Quality Troubleshooting 5 27 5 28 Phaser 7750 Printer Service Manual Adjustments and Calibrations The engine firmware has several built in diagnostic routines that perform various alignment and calibration procedures The printer is shipped aligned registered and calibrated In this chapter Registration Control RegiCon Adjustment Overview RegiCon Adjustment Procedures ATC Sensor Setup Resetting NVRAM Service Diagnostics PostScript NVRAM Resets Clear Tech Rep Faults Chapter Registration Control RegiCon Adjustment Overview The RegiCon tests are the means by which registration is accomplished Registration establishes the alignment of the four primary colors in the process and scan directions tilt or skew length of lines and linear
250. lt gt 4 YJHSINI4 912 21 06594 13A 6 5 8 YOSNIS YadVd 201 21 73A 9 seu 10151191 1U3J1n2J9A0 uSuA 1ea1 o1 960 2 1 paads 01 S60 2 L paads 1691 01 p60 2 1 07777777 paads 3001 0 1660 211 paeds 260 2 H paads 01 1160 211 LZFld rer 2086 YOSNIS 3INOH 212 21 09 821 79 3NOZ Yad NW 13S 0371191009 x YOSNIS NO XINI NO NO 490719 2 NO YOLOW uv3d 910 01 010 21 0620 49019 75 NO YOLOW S10 01 010 211 06620 3907 75 NO YOLOW uv3d S10 01 010 21 06620 318noa 88287 30010 72 NO uvas 151001 010 21 0 2 YOSNAS 9719 09 37191009 012114 05 35 3WOH uvad Au sapoo aui suome1edo au p
251. ly Remove the imaging unit plate cover see page 8 19 Remove the waste toner agitator motor Remove the left hand inner cover Remove the waste cartridge sensor holder see page 8 18 Disconnect the purple harnesses Remove the wiring harness from three clips Oat Remove 1 black screw to remove the mark on belt assembly 7 7150 013 Replacement Procedures Note If the mark on belt adjustment procedure RegiCon is being performed then proceed to the following steps 1 Using the laser window cleaning wand move the MOB sensor back into the original position Store the cleaning wand back in the front cover 8 30 Phaser 7750 Printer Service Manual Exit Transport Assembly Remove the rear cover see page 8 6 Remove the left hand top cover see page 8 8 Remove the fuser front cover Open left hand cover Remove the 1 screw securing the transport assembly cover and remove the cover oa Disconnect the harnesses to the transport assembly and the left hand cover interlock connector 7 Remove the 3 remaining screws securing the transport assembly and remove the assembly 7750 158 Service Parts Disassembly 8 31 Fuser Fan Assembly Remove the rear cover see page 8 6 Remove the top cover see page 8 5 Remove the right side cover A Note the routing of the wiring harness Note It is easier to re instal
252. m the right side of the printer Service Parts Disassembly 8 33 Belt Cleaner A Rep Open the right hand door Open the front cover and lower the main lever Lift the accumulator belt locking lever and pull the assembly out a few inches Using a 2 5 mm hex driver remove the 2 screws on the left side of the belt cleaner assembly Remove the belt cleaner assembly being careful not to spill toner 7150 131 lacement Procedures Caution 6 34 Never run the printer without the belt cleaner installed or severe damage to the Accumulator Belt can occur Ensure that the accumulator belt is fully inserted or severe printer damage can result NEVER FORCE THE MAIN LEVER Phaser 7750 Printer Service Manual Waste Auger Assembly Remove the right side cover see page 8 4 Remove the waste cartridge and lower the main lever Remove accumulator belt assembly see page 8 34 Return the main lever to its upright position Remove 2 screws securing the Waste Auger Assembly oa fr Shift the waste auger assembly to remove the drive shaft from the bearing and remove the waste auger assembly Note Be careful not to knock the bearing out of its seat or to spill the waste toner during removal 7750 236 Replacement Procedures Note When reinstalling be sure to return the main lever is down before reinstalling the accumulator belt assembly Service Parts Disas
253. m rear tamper J878A 1 to J848B 1 motor finisher control 4 J878A 3 to J848B 3 board 5 J878A 4 to J848B 4 6 J878A 6 to J848B 6 5 15 24 VDC present on pins J848B 2 and Replace the Troubleshoot and J848B 5 on the finisher control board finisher control repair the board 24 VDC interlock circuit 6 1 Check the tamper rear home sensorin Replace the Repair the sensor diagnostics 2 Does the value change from H to L when the tamper is moved away from the home position finisher control board circuit using the transmissive sensor troubleshooting procedure 3 52 Phaser 7750 Printer Service Manual Finisher Stacker Height Sensor Off Failure Code 116 The Stack Height Sensor did not detect that the tray went down within 5 seconds after the Stacker Tray had been signaled to lower down at initialization Or the Stack Height Sensor did not detect the tray moving up within 5 seconds after the Stacker Tray had been signaled to lift Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Stacker Height Sensor Actuator m Finisher Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Actuate the stacker height sensor in Go to step 2 Troubleshoot diagnostics using the 2 Does the value change between and L transmissive sensor procedure 2 1 Run the Finisher Stacker Motor Down test in Go to step 5 Go to step 3 diagnostics
254. maging Unit 3 Missing 231 Fuser STS Front Failure 210 Imaging Unit 4 Missing 232 Fuser STS Front Warm Time Fail Waste Cartridge Missing Fuser SSR1 Fail 211 233 A 9 Code Definition Code Definition 235 Fuser STS Rear Fail 260 Finisher Error 119 236 Fuser STS Rear Warm Time 261 Finisher Error 120 Fail 237 Fuser SSR2 Fail 262 Finisher Error 121 238 Fail 263 Finisher Error 122 239 Waste Toner Sensor Fail 264 Finisher Error 123 240 Yellow ATC Fail 265 Finisher Error 124 241 Magenta ATC Fail 266 Finisher Error 125 242 Cyan ATC Fail 267 Number of opcodes 243 Black ATC Fail 244 Engine Logic Board Fail 245 Engine Comm Fail 246 Engine RAM ROM Fail 241 Engine NVRAM Fail 248 Controller to Engine Timing Fail 249 Engine Micro Pitch Fail 250 HV Power Supply Fail 251 Tray Lift Fail 252 Finisher Error 111 253 Finisher Error 112 254 Finisher Error 113 255 Finisher Error 114 256 Finisher Error 115 257 Finisher Error 116 258 Finisher Error 117 259 Finisher Error 118 A 10 Phaser 7750 Printer Service Manual Missing Chain Link Codes Definitions 04 605 IOT NVM EMPTY 07 270 TRAY 2 PAPER SIZE SENSOR BROKEN 07 271 TRAY 3 PAPER SIZE SENSOR BROKEN 07 272 TRAY 4 PAPER SIZE SENSOR BROKEN 3TM 07 273 TRAY 5 PAPER SIZE SENSOR BROKEN 3TM 07 274 MPT PAPER SIZE SENSOR BROKEN 07 276 TRAY 4 PAPER SIZE SENSOR BROKEN TTM 07 277 TRAY
255. mated to room temperature and you should ensure that genuine Xerox toner is installed in the printer Print the Paper Tips Page for media that has been tested and approved for use in the Phaser 7750 Printer If the print quality defect is still present when printing on approved media from an unopened ream of paper then software applications and environmental conditions need to be researched Print a Usage Profile to determine the temperature and humidity the printer has been operating under Compare this to the environmental specifications for the printer found in Environmental Specifications on page 1 13 of this manual Temperature and humidity extremes can adversely effect the Xerographic and fusing characteristics of the printer When analyzing a print quality defect first determine if the defect occurs in all colors or only one color and if it is repeating or random Continuous defects in the process direction such as voids and lines are the most difficult to diagnose The visible surfaces of all rollers should be inspected for obvious defects Defects Associated with Specific Printer Components Some print quality problems can be associated with specific assemblies the most common problems and the associated assemblies are listed below Also refer to the specific print quality troubleshooting procedure for more information The ROS Potential Defects Streaks from contamination ROS windows usually single colo
256. mission This product includes an implementation of LZW licensed under U S Patent 4 558 302 Other marks are trademarks or registered trademarks of the companies with which they are associated PANTONE Colors generated may not match PANTONE identified standards Consult current PANTONE Publications for accurate color and other Pantone Inc trademarks are the property of Pantone Inc Pantone Inc 2000 Service Terms Manual Terms Various terms are used throughout this manual to either provide additional information on a specific topic or to warn of possible danger present during a procedure or action Be aware of all symbols and terms when they are used and always read NOTE CAUTION and WARNING statements Note A note indicates an operating or maintenance procedure practice or condition that is necessary to efficiently accomplish a task A note can provide additional information related to a specific subject or add a comment on the results achieved through a previous action Caution A caution statement indicates an operating or maintenance procedure practice or condition that if not strictly observed results in damage to or destruction of equipment Warning A warning statement indicates an operating or maintenance procedure practice or condition that if not strictly observed results in injury or loss of life Service Manual iii Symbols Marked on the Product DANGER high voltage Protective
257. more positive image areas on the photoreceptor and repelled by the higher negatively charged background areas A negative developer bias voltage assures good development of the image areas Theory of Operation 2 15 In the Write Black process for the Phaser 7750 printer the four individual images one in each color are transferred to the surface of the accumulator belt The second transfer roller puts a positive charge on the copy paper Then the four color image is transferred to the sheet of paper in one pass The positive charge attracts the negative toner particles from the accumulator belt to the copy paper The image data is processed through the image processor board and is then routed to the engine control board On the image processor board the process of screen generation is conducted In this process the incoming image data is arranged in a screen pattern before being sent to the ROS Laser The engine control board is the ROS driver board In other words it is the last location in the imaging path before the image data becomes optical information in the form of modulated laser beams In the case of the Phaser 7750 printer the engine control board sequentially passes data that comprises the 4 different color planes to the Laser Diodes in the ROS The color planes digital at this time that is they a stream of 175 0 digital information is applied to the ROS control circuit to turn the laser diodes o
258. moys 19 1 au 108498 9215 19464 0 994151591 pauiquioo Durpuodsa1102 10228 1 9215 1adeg 0 822 0522 09138 3ZIS 83414 osr yore aasnas 191918 03838 805835325 03136 3215 1 SALON reurspu 9 87 HOSNAS 3215 ELEH 919 6 8114 8Md FINGOW 1 TWNOIS 123130 JINON AVd L ONILYOHS 99 65 JINON SNISN3S 1218 H3dVd L7 10 45 Tray 4 Paper Size Sensing 6 6 06 aunen 2 pue susayed 440 NO YMS 94290591 1911 01 puodsa1102 59215 aded sous 9149 IYL 105096 9715 Jedeg Jo 820151591 0 10228 pasuas si 9715 1adeg 0 SALON YOSNAS 3715 3394 35135 8097 WNOIS 036486 0097 YOFZ azis YOSNAS 3215 U3dvd v U3dvd v 919118 TINTON AVL 1103 F SF9Hd 31000011 AYL borg 0287 20 6 yer YOSNAS 1218 d3dVd AVYL ONISNAS 371 d3dVd 272 Phaser 7750 Printer Service Manual 10 46 Tray 5 Paper Size Sensing 082 0922 gu zs E 5
259. mulator belt Since the transfer roller is located behind the print media the 4 color toner image is attracted to the lower potential and transfers to the surface of the print media 7 Cleaning The accumulator belt cleaner consists of a cleaner blade in contact with the accumulator belt surface after the point where the toner is transferred to the print media Toner remaining on the accumulator belt after the image transfer to the print media is stored in the waste cartridge 8 Fixing The finished toner image is unstable and easily smeared To fuse the image the print media goes through the fuser assembly where it passes between a pressure belt and the heat roller The toner is fused onto the print media by the combination of heat and pressure Theory of Operation 2 3 Paper Path of the Printer The Phaser 7750 printer has a C shaped paper handling path The design helps it achieve high production outputs The paper paths available for the paper exiting the fuser are W Straight to the Output Tray in the Top Cover facedown W Straight to the optional Finisher Paper be inverted for 2 sided printing A wm 8 X ali 7750 125 Trays 1 5 The paper trays consist of four main trays and one Multi Purpose Tray on the side of the printer Tray 1 MPT is located on the left side of the machine and allows feeding of specialty media stock envelopes and custom size paper On the GX configuration Trays 2 3 4 and
260. n Definition Finisher Sensors Interlocks Left Hand Cover is L Top Cover is L Docking is H Horiz Transport is L Horizontal Transport Entry is L Exit is L IOT Full is L Compiler Tray Exit is L Paper is L Cover Safety Switch is L Stacker No Paper is L Height is H Upper Limit is L Stack A is L Stack B is L Tamper Rear Home is L Front Home is H Stapler Head Home is L Low is L Ready is L Move is L Front Corner is H Miscellaneous Reg Clutch is H Eject Home is L Set Clamp Home is L Decurler Cam Position L Optional only if Finisher is installed H Open actuated or paper present Closed deactuated or no paper present time Motors Fans Tests Tests the operation of motors by running one or more motor tests at a m Steering Motor m Imaging Unit Motor m Accumulator Belt Motor CAUTION To avoid damaging the accumulator belt it must be removed prior to performing the following motor tests Main Motor Main Motor is On This test produces gear hopping Turn Motor Off noise unless you perform the 2nd All Motors Off transfer roller retract motor test prior to this test 4 Phaser 7750 Printer Service Manual Test Front Panel Display Test Operation Definition Steering Motor Do you wish to continue Yes No Motor On Motor Off Please cycle power to the printer now CAUTION To avoid damaging the Accumulator Belt it is
261. n and off A 0 turns the laser on and a turns it off Using this technique the digital levels that make up the image data are modulated onto the laser beams As each of the four laser diodes scans the surface of the drum in the YMCK sequence the image data is reflected and collimated within the ROS and is finally reflected out to each imaging unit where the charged photoreceptor is exposed by the laser As the laser beam scans across the photoreceptor a latent image is created on the surface of the drum As the imaging unit turns it acquires the latent image from the ROS and toner from the developer housing 2 16 Phaser 7750 Printer Service Manual RegiCon Overview The RegiCon procedure is used to ensure that the four lasers in the ROS are correctly aligned to provide correct registration for each color The Mark On Belt MOB sensors are used in this procedure to determine the relative position of chevrons developed onto the accumulator belt Front MOB Sensor movable Rear MOB Sensor stationary The MOB sensors are located below the accumulator belt The RegiCon procedures read chevrons on the front rear and center of the accumulator belt In the Center Setup procedure the position of the front MOB sensor is changed to allow it to read the chevrons developed on the center of the accumulator belt L Chevron Chevron locations for locations for Center Setup Skew and IN OUT Setup Location
262. nel the ability to energize de energize one clutch at a time Take Away Clutch Developer Clutch Registration Clutch Duplex Clutch Finisher Clutches optional Solenoid Tests Tests the functionality of the solenoids by giving service personnel the ability to energize de energize one solenoid at a time Exit Gate Solenoid Duplex Gate Solenoid Shutter Solenoid ADC Shutter Open ADC Shutter Close Tray 1 Feed Solenoid Finisher Solenoids optional Adjustments Calibrations Performs adjustments calibrations and operations essential to the performance of the printer Belt Edge Learn ATC Sensor Setup TRC Adjust ADC Output Check Tone Up Down Laser Power Check PWM Mapping Data Read Coarse RegiCon Init Maintenance Cleans the IDT rollers within the Imaging Unit Clean Fuser Clean Accumulator Belt NVRAM Access This menu lets you read set or reset the following values PostScript NVRAM Reset Clear Tech Rep Faults Reset CRU Life Counters Reset Engine NVRAM Store Engine NVRAM Exit Exits service diagnostics and reboots the printer For Authorized Service Personnel Use Only Service Menu functions are to be used by Xerox service personnel and authorized service providers only The printer can be damaged by improper use of the built in service tests Phaser 7750 Printer Service Manual Service Usage Profile Status Codes Code Definition Code Defi
263. ng service are recommended as a start for servicing the printer As additional tools are needed visit the following URL for help http cpid office xerox com hardwaretools html Part Number Description 003 0293 00 Driver Magnetic 0 25 drive no bits 8 shank 003 0335 00 Tip 1 Philips Bit 0 25 drive 003 0336 00 Tip 42 Philips Bit 0 25 drive 640600 Mag 27020 Tip 2 5 mm Hex Bit 0 25 drive 600T02123 Hex Nutdriver 5 5 mm magnetic Service Parts Lists 9 49 9 50 Phaser 7750 Printer Service Manual Wiring Diagrams In this chapter m Plug Jack Locations Table m Plug Jack Locator Maps Wiring Diagrams Wiring Schematics Chapter 10 Plug Jack Locations Plug Title Jack No Map Number Item No 2 Map 12 8 HVPS T1 T3 24V LVPS 15A Map 16 19 PWB MAIN Motor LVPS T2 16 Map 16 16 PWB MAIN Motor LVPS T2 42 Map 18 10 AC Drive PWB Noise Filter PWB Delay PWB 43 Map 18 11 AC Drive PWB Noise Filter PWB Delay PWB 46 Map 18 1 AC Drive PWB Noise Filter PWB Delay PWB J70 Map 18 12 AC Drive PWB Noise Filter PWB Delay PWB 72 Map 12 9 HVPS T1 T2 24V LVPS 102 Map 3 1 Inverter Transport Assembly 103 Map 8 4 MSI Unit 104 Map 7 3 Exit Transport Assembly 106 Map 19 3 Left Lower Assembly Tray 2 Feeder 108 Map 19 2 Left Lower Assembly Tray 2 Feeder 109 Map 5
264. ning This test checks that the USB core is functioning USB Hard 13 piae Real Time Soft 14 The real time clock is tested Clock 0 RAM DIMM Soft 15 This test examines bad or incompatible RAM DIMMs Presence Checks that there is at least 128 MB installed and Min RAM Limits Soft 16 ignores more than 512 MB Max RAM Checks to ensure no more than 1 GB of RAM is Limits Soft 17 installed Checks the disk controller core and runs Soft 20 DIAGNOSE command on the hard drive Checks hardware to see if a failure of the CPU cooling CPU Fan Hard fan has occurred Cage Fan Hard 25 Checks hardware to see if a failure of the electronics cooling fan has occurred Error Messages and Codes 3 9 Error Messages and Codes Index Table Code Error Message Chain Link Page 10 Laser Unit Failure 06 380 pg 3 12 06 381 06 382 06 383 06 385 11 Laser Unit Polygon Motor Failure 06 372 pg 3 12 12 Yellow ATC Sensor Failure 09 380 pg 3 13 13 Magenta ATC Sensor Failure 09 381 pg 3 13 14 Cyan ATC Sensor Failure 09 382 pg 3 13 15 Black ATC Sensor Failure 09 383 pg 3 15 20 Transfer Roller Contact Failure 09 342 pg 3 17 21 Transfer Roller Retract Failure 09 343 pg 3 17 1st BTR Contact Failure 09 348 pg 3 18 1st BTR Retract Failure 09 349 pg 3 18 30 Accumulator Belt Home Position Took Too Long 04 346 pg 3 19 31 Accumulator Belt Home Position Failu
265. nisher Control Board m Staple Move Motor Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Manually move the staple head Go to step 2 Diagnose and 2 Does the head move smoothly from repair the front to rear mechanical defect 2 1 Enter service diagnostics run the Go to step 3 Use the Stapler Move Sensor test Transmissive 2 Does the value change from L to H Sensor procedure when the sensor is blocked to diagnose and repair the sensor 3 1 Run the Stapler Move Front or Move Replace the Go to step 4 Rear test in diagnostics finisher control 2 Does the stapler move motor run board 4 15 24 VDC present at P847 pins 1 2 5 Replace in the Go to step 5 and 6 following order m stapler move motor finisher control board Error Messages and Codes 3 47 Troubleshooting Procedure Continued Step Actions and Questions Yes No 5 15 24 VDC present at P847 4 Replace the Troubleshoot the finisher control 24 VDC board interlock circuit using the Troubleshooting the 24 VDC LVPS on page 4 18 3 48 Phaser 7750 Printer Service Manual Finisher Stapler Failure Code 113 The staple home sensor doesn t turn ON within 2 seconds after the stapler motor started to turn backwards Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Finisher Control Board m Staple Unit Assembly Troubleshooting Proced
266. nition 0 Ready 20 Tray 2 missing not printing from 2 1 Accumulator near end of life 21 Tray 1 missing not printing from 1 2 Fuser near end of life 22 Stapler not ready 3 Belt cleaner near end of life 23 Stapler near empty 4 Transfer roller near end of life 24 Stapler empty 5 Waste toner cartridge is getting 25 Stapler Cartridge empty full 6 Cyan toner is getting low 26 Job not stapled 7 Magenta toner is getting low 21 IP address is being used by someone else 8 Yellow toner is getting low 28 Processing Data 9 Black toner is getting low 29 Receiving Data 10 Imaging Unit 1 is near end of life 30 Engine is printing 11 Imaging Unit 2 is near end of life 31 Progress printing page n 12 Imaging Unit 3 is near end of life 32 Progress printing page n of n 13 Imaging Unit 4 is near end of life 33 Progress cleaning page n 14 No paper tray 4 not printing 34 Progress cleaning page n of n from 4 15 No paper tray 3 not printing 35 Thermals unstable from 3 16 No paper tray 2 not printing 36 Initializing mech from 2 No paper tray 1 not printing Clearing job 1 from 1 37 18 Tray 4 missing not printing from 38 Cancelling cleaning job 4 19 Tray 3 missing not printing from 39 Printer in cleaning mode 3 20 Tray 2 missing not printing from 40 In Energy Star mode 2 A 5 Code Definition Code Definition 41 Stapler not ready 66 No laser paper HC tray 2 42 Top Cover Interlo
267. nnector 8 Ethernet Connector 4 Health LEDs 5 Hard Drive General Information 1 7 Routine Maintenance Items and Consumables Routine Maintenance Items 1 Transfer Roller 2 Fuser 3 Belt Cleaner Assembly 4 Imaging Units 5 Waste Cartridge 7750 449 Consumables 6 Toner Cartridges Service Parts 7 Accumulator Belt Consumable capacity is based on 5 per color on A4 Letter paper Routine Maintenance Item capacity is based on A4 5 Routine Maintenance Consumables Transfer Roller 100 000 Cyan Toner 22 000 Imaging Units 30 000 A4 images Magenta Toner 22 000 Fuser Unit 60 000 Yellow Toner 22 000 Waste Cartridge 27 000 Black Toner 32 000 Service Parts Accumulator Belt Lifetime 480 000 coverage independent 1 6 Phaser 7750 Printer Service Manual Printer Specifications Physical Dimensions and Clearances Print Engine Dimensions Value Height 493 mm 19 4 in Width 644 mm 25 4 in Depth 715 mm 28 15 in Weight 91 kg 200 Ibs 2500 Sheet High Capacity Feeder Dimensions Value Height 364 mm 14 3 in Width 644 mm 25 4 in Depth 682 mm 26 9 in Weight 40 kg 88 Ibs 1500 Sheet Lower Tray Deck Dimensions Value Height 364 mm 14 3 in Width 644 mm 25 4 in Depth 682 mm 26 9 in Weight 30 kg 66 Ibs Clearances For the optional finisher clearances see Pha
268. nostics Replace the Replace the 2 While running the Imaging Unit Motor imaging unit drive engine control test check the voltage at J210 9 motor board 3 the voltage 5 VDC while the test is running Error Messages and Codes 3 35 Imaging Unit 1 2 3 4 Communications Failure Code 70 71 72 73 Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Imaging Unit Imaging Unit Plate Assembly Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Replace the imaging unit reporting the Go to step 2 Complete error 2 Does the error still appear 2 1 Remove the imaging unit from the Replace the Troubleshoot the problem location and inspect the imaging unit plate wiring If wiring is connector assembly OK replace the 2 Is the connector damaged engine control board 3 36 Phaser 7750 Printer Service Manual Black Imaging Unit Motor Failure Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Imaging Unit Motor Engine Control Interface Board Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 Run the Black Imaging Unit Motor test from Go to step 7 Go to step 2 diagnostics Does the motor operate correctly 2 Is the voltage at J235 4 5 VDC Go to step 3 Use wirenet 8 2 to troubleshoot the missing 5 VDC 3 Is the volt
269. not secure and can come apart during removal and replacement causing toner spillage Service Parts Disassembly 8 21 Imaging Unit Plate Assembly Caution The imaging units are very light sensitive Store away from light Do not touch the surface of the imaging units 1 Remove the imaging units 2 Leave the main lever down 3 Remove the waste cartridge sensor holder see page 8 18 7750 128 4 Remove the imaging unit plate cover see page 8 19 5 Remove the dispense assemblies see page 8 20 6 Disconnect the wiring harnesses to all four developer housing assemblies and remove them from under their retaining clips and dress the wires so they stick straight out the front of the printer 7 Clear the wire harnesses from the guide located on the lower left side of the assembly 8 22 Phaser 7750 Printer Service Manual 8 Remove the 6 chrome plated screws that secure the plate to the frame Note Complete removal of the imaging unit plate assembly is not required for removal of the Developer s Tilt the imaging unit plate assembly forward enough to allow the developer s to be removed Do not disconnect the imaging unit plate harnesses 7750 018 9 Remove screw securing the left hand inner cover and remove the cover 10 Disconnect the wiring harness from its retaining clip 11 Disconnect the harness 12 Remove the imaging unit plate assembly Service Parts Disassembly 8 23 Replacem
270. nt the high voltage wire leading to that color s developer housing is grounded Inspect the high voltage wiring harnesses 5 22 Phaser 7750 Printer Service Manual The toner image is not completely fused to the paper The image easily rubs off The printer displays no error code 1 Make sure that the paper you are using is the correct type for the printer and is correctly loaded in the printer in the correct tray From the front panel s Information Pages Menu select Paper Tips Page Make sure that the paper loaded in the tray matches the paper type selected on the printer s front panel If the problem continues set the paper type in the front panel to the next heavier type of paper than what you are using Below is a list of paper types from the heaviest weight to the lightest Thick Cover Index Thin Cover Index Heavy Laser Paper Laser Paper Unfused Image or Image Easily Rubs Off of Page 3041 51 Check for paper wrapped around or blocking the fuser roller Inspect the fuser roller for damage Replace the fuser if necessary Print Quality Troubleshooting 5 23 Toner on Back of Print There is toner on the back of the printed sheet of paper 1 2 Clean the printer interior Inspect the paper that is loaded in the paper trays Is the paper clean and free of toner Try printing from supported media Ensure that the loaded media matches the front panel settings
271. ntinuity checks on any wiring harnesses involved Error Messages and Codes 3 61 3 62 Phaser 7750 Printer Service Manual General Troubleshooting In this chapter Introduction Service Diagnostics Front Panel Troubleshooting Inoperable Printer Troubleshooting Troubleshooting Power Supplies and Interlocks Media Jams and the Paper Path Operating System and Application Problems Chapter Introduction This chapter covers the general startup PostScript and power supply operations of the printer to aid in troubleshooting problems not associated with an error code or front panel error message For troubleshooting problems associated with an error code or front panel error message see Error Messages and Codes on page 3 1 Troubleshooting procedures isolate a problem to a specific component or subassembly in some cases including the wiring harness Service Diagnostics The Phaser 7750 Color Laser Printer has built in diagnostics that allow access to sensors turning on and off motors clutches solenoids built in test patterns cleaning maintenance operations printer status and some NVRAM access Using these tests the service technician should be able to diagnose problems quickly and isolate which component or sub assembly part needs replacement Service diagnostics are to be executed through the front panel by a certified service technician only Service Diagnostics can be entered one of two ways Entering Service
272. ompleted the following tasks Loaded a Phaser printer PCL PostScript printer driver W Printed and kept a current copy of the Configuration Page Printing the Configuration Page You can print the Configuration Page to help you solve printing problems and obtain the best results from your printer Access this page from the printer s front panel To print the Configuration Page 1 At the printer s front panel select Printer Setup then press the OK button 2 Select Configuration Page then press the OK button to print Note Print Menu Map to see other information pages available for printing Verifying Settings 1 Verify the settings on the Configuration Page IP Address Source is set to DHCP Front Panel BOOTP or Auto IP depending on your network configuration W Current IP Address is set correctly Note this address if it is assigned by Auto IP DHCP Subnet Mask is set correctly if used Default Gateway is set correctly if used LPR is enabled Verify that the LPR and AppSocket settings are set as desired W Interpreters Auto PCL or PostScript depending on your driver General Troubleshooting 4 23 2 Verify that the client is logged into the network and printing to the correct print queue The user should also have access to the Phaser printer queue Verifying Driver Installation 1 Right click My Network Places on the desktop then click Properties 2 R
273. on problems Once you complete these steps print a test page from your software application If the job prints no further system troubleshooting is necessary If there are print quality problems go to Reference Troubleshooting on the User Documentation CD ROM Macintosh Troubleshooting Step By Step Mac OS 9 x Perform these steps only for Mac OS 9 1 Open the Chooser then click the LaserWriter driver 2 Do one of the following m Ifthe printer name appears your printer is communicating through the network You do not need to perform any additional steps If your printer name does not appear proceed to Step 3 3 Verify that the printer is plugged in turned on and connected to an active network 4 Verify the cable connection from the network to the printer 5 Follow these steps a From the printer s front panel verify that EtherTalk is enabled If it is not enable it in the front panel then reset the printer b Print the Configuration Page and verify that EtherTalk is enabled C From the Configuration Page verify the Zone If you have multiple zones on your network verify that your printer appears in the desired zone 6 If you are still unable to print go to www xerox com office support or access PhaserSMART Technical Support through CentreWare Internet Services Launch your web browser W Enter your printer s IP address in the browser s Address field http XXX XXX XXX XXX Select Sup
274. on CD ROM Verifying Settings 1 Verify the settings on the Configuration Page m IP Address Source is set to DHCP Front Panel BOOTP or Auto IP depending on your network configuration W Current IP Address is set correctly Note this address if it is assigned by Auto IP DHCP or BOOTP 4 24 Phaser 7750 Printer Service Manual Subnet Mask is set correctly if used Default Gateway is set correctly if used LPR is enabled Verify that the LPR and AppSocket settings are set as desired W Interpreters Auto PCL or PostScript depending on your driver 2 Verify that the client is logged into the network and printing to the correct print queue The user should also have access to the Phaser printer queue Verifying Installation Right click the My Network Places icon on the desktop and select Properties Click the Protocols tab to verify that the TCP IP protocol has been installed Click Add to install any components not listed then restart your computer Click Start click Settings then click Control Panel Double click Services oa Locate TCP IP Print Server then verify these column entries W Status column Started W Startup column Automatic 7 Click Start click Settings then click Printers 8 Right click the printer icon then select Properties Verify that you have installed the correct driver for your printer 9 Select the Ports tab Verify that the IP Address in t
275. ons of the Low Voltage Directive 73 23 EEC and its amendments EN 60950 IEC 60950 Safety of Information Technology Equipment including Electrical Business Equipment Following the provisions of the Electromagnetic Compatibility Directive 89 336 EEC and its amendments EN 55022 1998 CISPR 22 Limits and Methods of measurement of radio interference characteristics of Information Technology Equipment Class B EN 61000 3 2 1995 A1 1998 A2 1998 IEC61000 3 2 Part 3 Limits Section 2 Limits for harmonic current emissions equipment input current less than or equal to 16A per phase EN 61000 3 3 1995 IEC61000 3 3 Part 3 Limits Section 3 Limitation of voltage fluctuations and flicker in low voltage supply systems for equipment with rated current less than or equal to 16A EN 55024 1998 CISPR 24 Information technology equipment Immunity characteristics Limits and methods of measurement CISPR 24 Immunity Phenomena Basic Standard Test Specification Electrostatic Discharge IEC 61000 4 2 1995 6 kV Contact 10 kV Air Radio Frequency Electromagnetic Field radiated IEC 61000 4 3 1995 80 1000 MHz 3 V m 80 AM 1 KHz Fast Burst Transients IEC 61000 4 4 1995 5 50 Tr Th ns 5 kHz Rep Freq 0 5 kV Signal Lines 1 kV AC Mains Line Surge IEC 61000 4 5 1995 Combination wave 2 0 kV Common mode 2 0 kV Differential mode
276. ormed Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Fuser m Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Turn OFF power remove the fuser Go to step 2 Replace the fuser assembly and allow it to cool down assembly 2 Measure the resistance between the Fuser connector P600 7 and P600 9 3 Does the resistance measure between 30 K and 190 K Ohms 2 1 Reinstall the fuser assembly Go to step 4 Go to step 3 2 Enter service diagnostics 3 From the Sensor Tests run the Fuser Temperature test 4 15 the temperature indicated approximately 165 C 3 1 Turn OFF printer power Go to step 4 Repair or replace 2 Measure the resistance between the wiring J641 4 and J641 5 on the engine harness control board 3 Does the resistance measure between 30 K and 190 K Ohms 4 1 printer power back Check the AC Replace the 2 Is there 3 4 VDC between J590 3 Wiring harness to engine control and ground the fuser board If the check is OK replace the AC drive assembly Error Messages and Codes 3 29 Fuser STS Rear Failure Code 45 Rear Thermistor open error The machine logic detected an open circuit in the rear thermistor Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Fuser Engine Control Board Troubleshooting Procedure
277. ot repeat 9 If the adjustments are no longer having an effect or the lines move in the opposite direction selected go back to Step 5 and answer Yes to Set Factory Defaults Now go through Steps 5 through 8 again If the results are still not satisfactory examine the chevron pattern on the belt during Regicon Adjustments and Calibrations 6 13 ATC Sensor Setup The automatic toner concentration ATC sensor measures the toner to bead ratio in each developer These sensors have an intrinsic gain and output value that are stored in printer NVRAM New values must be entered when a new developer housing is installed Incorrect values have color balance effects On the side of each developer housing assembly is a small tag with a bold faced three digit number printed near the bottom The first digit is always 0 The other digits range between 0 and 99 To set the new values 1 Enter Service Diagnostics 2 Highlight Adjustments Calibrations menu and press OK 3 4 Note the current values for the tag numbers on the front panel display They Highlight ATC Sensor Setup Test and press OK should correspond to the tag numbers of the developers actually installed Select the color of the developer you installed Enter the tag number Use the Back and Info buttons to select which digit you want to change Use the Up and Down buttons to actually modify the digit Press OK to enter the data in engine NVRAM
278. ould be done It should not be necessary to rerun the test after making this adjustment 1 From the Hidden Service menu highlight the RegiCon Setup Cycle menu and press OK 2 The first time any RegiCon test is requested the pages used to perform the test must be created so there is a short delay During this time the front panel displays Processing Data Please Wait 3 Highlight Do 2 In Out Skew Setup and press OK The front panel now displays Testing Please Wait 4 Wait until the test results are displayed as follows In Out Skew Setup Passed Min A Blocks 24 Min B Blocks 0 In Out Skew Setup Passed Readjust Min A Blocks 24 Min B Blocks 0 Yellow 2 Click CW Magenta 1 Clicks CCW Cyan 5 Clicks CW Black 5 Clicks CCW Note If the block counts are not the same number as presented here the printer has a print quality problem See Streaks in Direction of Paper Travel on page 5 17 to resolve the problems before proceeding further with RegiCon 6 8 Phaser 7750 Printer Service Manual 5 If an adjustment is needed adjust by the amounts displayed on the front panel 6 After 2 minutes the test selection menu will re appear To examine the test results after this occurs highlight the appropriate test and press the Information button The display is the same as previously except that Do 2 In Out Skew Setup appears as the first text below the line When RegiCon 1 or RegiCon 2 Fails
279. paper feed it sends a feed signal to momentarily energize the Tray 1 solenoid causing the feed roller to pivot down When the pick roller contacts the paper a sheet is fed into the nip between the feed roll and the takeaway roll 2 6 Phaser 7750 Printer Service Manual 2 Sided Printing Inverter Forward Exit Roll Inverter Reverse Clutch Clutch Full Paper Stack Sensor Face Down Tray Fuser Exit Switch i Fuser Assy Fuser Exit Roll FUSER Exit Gate Sensor 12 Main Motor 1 7750 450 Paper leaving the fuser can be directed to the top output tray or the finisher If 2 sided duplex printing has been selected paper can be directed through the inverter transport and into the duplex transport The duplex paper path reverses the direction of paper travel and the duplex gates direct the paper through the inverter and into the duplex transport An image can then be placed on the second side of the media Theory of Operation 2 7 Fuser Pressure Plate 2 Fusing Process The fuser receives its drive from the main motor After the toner images are applied to the paper the paper is then passed through the fuser The fuser belt is pressed against the heat roller to melt the toner and bond it to the paper The fuser belt is always spring loaded against the heat roller but can be released for jam clearance The flexibility of the belt versus a pressur
280. pasuas 10suas UaYM 0019919 1900 Assy L 6 6H29 988 105095 91v Assy 20 4 190 pasuas iosueg 21v 0 Duip1oo2e 91102 51 Y asuadsig 104 104402 9091 pue Assy 1910 sasneo 10101 asuadsiq 1910 uo 10 02 88490811 10 b uonduinsuoo 1910 59 04102 2021 pasuas sosuas 919 Aq 14 3 Jeuoj 19U0 07 200 600 100 600 05894 uo 16909 Janay 104109 1940 108498 1910 OU SEY 141 0 LON YILNI 1 019 aasnadsia ma T ay NI NYAD 0224 09834510 0 00 1 ni VINIOVIN 38134810 03834810 3983490 00 600 06600 UNOL MOTHA ma 03834810 INI 201025 mas ezzr 1 0 0 38134510 3539810 sg 100 6001 06620 YILNI mas woo ma 41 2 2 7 NO 38834810 YINOL 35434510 s 59 200 600 08520 oaAre 01 L n T b 2 ont ey DONE C NO ad 2 A 334510 YINOL 1614 eld
281. port Click the PhaserSMART Diagnostic Tool link to access PhaserSMART General Troubleshooting 4 27 Mac OS X Versions 10 1 and 10 2 Perform these steps only for Mac OS X versions 10 1 and 10 2 1 Open the Network Utility then click the Ping tab 2 Enter your printer s IP address 3 Click Ping If you do not get a response confirm that your TCP IP settings are correct for both your printer and computer 4 For AppleTalk follow the steps below For TCP IP proceed to Step 5 a b From the printer s front panel verify that EtherTalk is enabled If it is not enable it in the front panel then reset the printer Print the Configuration Page and verify that EtherTalk is enabled From the Configuration Page verify the Zone If you have multiple zones on your network verify that your printer appears in the desired zone 5 If you are still unable to print go to www xerox com office support or access PhaserSMART Technical Support through CentreWare Internet Services a b c d Launch your web browser Enter your printer s IP address in the browser s Address field http XXX XXX XXX XXX Select Support Click the PhaserSMART Diagnostic Tool link to access PhaserSMART Novell NetWare Troubleshooting Troubleshooting for Windows based computers includes both hardware and software solutions to eliminate cabling communication and connection problems associated with direct connected
282. ports Complete one of the following procedures based on the type of port being used then print a test page from your software application If the test page prints no further system troubleshooting is necessary For print quality problems go to Reference Troubleshooting on the User Documentation CD ROM Requirements Verify that you 4 25 Are operating a Windows based system with CentreWare DP software installed and at least one printer driver installed Are a NetWare Network Administrator an administrative person with ADMIN SUPERVISOR or ADMIN SUPERVISOR EQUIVALENT within login rights to the NetWare Server s servicing the Phaser printer Have a basic knowledge of NetWare Phaser 7750 Printer Service Manual Novell NetWare Troubleshooting Quick Check 19 2 Verify that the printer is plugged in turned on and connected to an active network Verify that the printer is receiving network traffic by monitoring the LEDs on the back of the printer When the printer is connected to a functioning network and receiving traffic its link LED is green and its amber traffic LED is flashing rapidly Verify that the client is logged into the network and printing to the correct print queue 4 Verify that the user has access to the Phaser printer queue Verify that the Phaser printer NetWare print queue exists is accepting jobs and has a print server attached If it does not use the Setup Wizard in CentreWare DP to
283. pply T1 Board High Voltage Power Supply Board High Voltage Power Supply T2 Board AC Drive Board Noise Filter Board 57700 317 Theory of Operation 2 13 2 14 24 Low Voltage Power Supply 24 Low Voltage Power Supply Fan AC Power Chassis 3 3 V Low Voltage Power Suppl pem 5 V Low Voltage Power Supply 7750 448 Phaser 7750 Printer Service Manual ROS and Regicon Technology Overview The locations of the ROS and the ROS shutter solenoid are shown in the following figure ROS Shutter Solenoid There are four ROS shutters not shown The ROS module is field replaceable and contains four laser diodes one polygon motor mirror and several lenses and mirrors m The ROS module reflects the four laser beams so that they strike the Imaging Units correctly m The ROS module contains four mirrors that can be adjusted for skew using RegiCon This adjustment MUST be made when the ROS is replaced NEVER remove the cover from a ROS module for ANY reason contamination will result Write Black Process The Phaser 7750 Printer uses a black writing process for exposing the imaging units In the write black process the image areas are discharged or exposed Because the image area is normally much smaller than the background area the Write Black approach extends the life of the laser diode In the Write Black process the negative toner particles are attracted to the
284. r Light Image single color or all colors Banding Slow Scan direction 5 2 Phaser 7750 Printer Service Manual The Imaging Units Potential Defects usually single color Spots Deletions Bands Repeating defects 44 mm 1 7 in or 94 mm 3 7 in The Developer Housings Potential Defects usually single color Bead Carryout grit on copy Spots Deletions Mottle Uneven density front to rear Repeating defects 28 3 mm 1 1 in The Accumulator Belt Assembly Potential Defects usually all colors Spots Deletions Banding Uneven density front to rear Offsetting Ghost Images cleaner malfunction Repeating defects every 4th 8 1 2 x 11 or every other 11 x 17 The Fuser Potential Defects all colors Streaks Spots Bands Offsetting Repeating defects 84 mm 3 3 in or 94 mm 3 7 in Transfer Roller 88mm Print Quality Troubleshooting 5 3 Paper and Paper Trays Potential Defects all colors Mottled Image low quality or damp paper Creases and folds Front Panel Test Prints A variety of test prints are available from the front panel s Troubleshooting Menu to aid in determining the quality of output from the printer and to assist in troubleshooting problems This section shows how to select and analyze all test prints available to the Phaser 7750 printer Troubleshooting Print Quality Page Selecting the Troubleshooting Print Quality Page causes a tuto
285. r press up on the two locking tabs at the bottom of the sensor and remove the sensor 11 10 Phaser 7750 Printer Service Manual Horizontal Transport Assembly 57700 319 1 Unplug the finisher from the printer 2 Lift the two hooks securing the horizontal transport assembly to the finisher 3 Remove the horizontal transport assembly 11 11 Horizontal Transport Top Open Front and Rear Cover 87700 320 57700 452 Remove the horizontal transport assembly see page 11 11 Remove 1 screw securing the stopper Remove 2 screws from the horizontal transport front cover and remove the cover Remove the hinge screw and remove the top open cover Remove 2 screws securing the horizontal transport rear cover Remove the horizontal transport entrance upper cover assembly oc FP WON Remove the horizontal transport exit guide by pressing on the tabs on the lower right edge of the horizontal transport frame 8 Remove the upper rear cover 11 12 Phaser 7750 Printer Service Manual Horizontal Transport Entrance Upper Cover Assembly a WN 57700 321 Remove the horizontal transport assembly see page 11 11 Remove the front cover see page 11 12 Remove 2 screws securing the rear cover and remove Remove the gate in solenoid assembly Remove 4 screws securing the entrance upper cover assembly 11 13 Horizontal Transport Belts 7700 324 57700 323 Remove the hori
286. r installed 4 4 Phaser 7750 Printer Service Manual Test Front Panel Display Test Operation Definition Print Laser Check Fuser warming up Laser Init Startup Imaging Delivering Finishing Laser Done This is a quick test for all four laser colors including developer and toner All four primaries are present on the page The print should appear grey Print Halftones HalfTones Init Startup Imaging Delivering Finishing HalfTones Done Prints 6 pages of 100 solid fill for Yellow Magenta Cyan Black Red and Green Print Grid 1 dot Grid Init This print displays the four primary Startup Imaging Delivering color lines in a grid pattern See Finishing RegiCon Adjustment Procedures Grid Done on page 6 5 Print Fast Scan 8 Scan Init Prints four pages of eight tones for Tone Startup Imaging Delivering each primary color Finishing Note Use SEF to see all scans Scan Done Sensor Tests The technician should test the functionality of each sensor by blocking the sensor and watching its state change on the front panel NOTE Several jam sensors only change state if a jam has occurred All doors interlock switches must remain closed or defeated to test for a changed state NOTE The default state of all sensors are shown under the following conditions m The printer s front panel displays Ready to Print m All covers are closed All rout
287. r logic detects that the toner concentration is lighter than the target value and adds toner to the developer If the test values all equal the results shown below the test has not detected any problems lt Tone Up Down gt Result 0 Status 0 ATC Sensor Fail None ATC Limit Warn None ATC Change Warn None If the ATC sensor fails possible causes are The sensor connection is bad reseating the connector The sensor is defective 2 24 Phaser 7750 Printer Service Manual There is a developer problem either with the housing the amount of beads in the developer Tone Up Down Messages Front Panel Message Typical Values CMYK Sens Warn 0 Pages XX Number of pages since last check ATC Control XXX 565 ATC Corr XXX 604 606 Ave ATC XXX 593 615 ATC Vol XXX 320 428 ADC Sensor The sensor in this figure is the Automatic Density Control ADC sensor It is located on the MOB Sensor Assembly To control image quality this sensor looks at patches that are developed onto the accumulator belt at various times Data from the ADC sensor is used to ADC Sensor W Adjust the intensity of each laser the ROS Setthe look up table for Tone Reproduction Curve TRC Determine amount of toner to add to developer triggered by ATC sensor Theory of Operation 2 25 Determine toner cartridge empty triggered by ATC sensor
288. r software and at the printer s front panel Check the color correction and print mode settings in the printer driver m Cycle power to the printer this will run an Auto Density Control cycle Run test prints and compare the results to the customers problem 5 12 Phaser 7750 Printer Service Manual Light or Undertone Prints in All Colors The overall image density is too light in all colors 1 Verify the transfer roller has not reached its end of life 2 Run the Calibrate for Paper routine 3 Check the accumulator belt assembly for mis alignment 4 Replace the transfer roller 5 Replace the high voltage power supply Print Quality Troubleshooting 5 13 Blank Prints The entire image area is blank 1 Generate a 100 Solid Fill Test print from the front panel 2 Open the door in the middle of the print job Is there toner on the Accumulator Belt 3 Enter service diagnostics and test the shutter motor Does the laser shutter motor work properly Remove an imaging unit and see if the shutter opens and closes freely 4 Inspect the wiring harness for loose or disconnected wiring connectors check connectors P400 and P401 at the engine control board 5 Print the Engine Test Prints If the test prints are free from defects replace the Image processor Board If the test prints show defects replace the engine control board 5 14 Phaser 7750 Printer Service Manual One
289. ration or a printer component that needs replacement see the following chapters for more information W Chapter 6 Adjustments and Calibrations on page 6 1 Chapter 8 Service Parts Disassembly on page 8 1 provides detailed steps for removing and replacing all major parts of the printer m Chapter 9 Service Parts Lists on page 9 1 details the location quantity and part number for all spared parts of the printer Error Messages and Codes 3 5 General Notes on Troubleshooting 1 3 6 Unless indicated otherwise the instruction turn ON printer power means for you to switch ON the printer power and let the printer proceed through POST to a Ready condition When instructed to take resistance readings between P J 232 lt gt P J 210 without specified pin numbers check all pins See Wiring Diagrams on page 10 1 for the location of all wiring harnesses and pins When you are instructed to take a voltage reading the black probe is generally connected to a pin that is either RTN Return or SG Signal Ground You can substitute any RTN pin or test point in the printer and you can use FG frame ground in place of any SG pin or test point Before measuring voltages make sure the printer is switched ON the imaging units and the paper trays are in place and the interlock switches are actuated unless a troubleshooting procedure instructs otherwise Before measuring continuity or resistan
290. rd 11 1 Reseatthe paper tray Replace the paper Replace in order 2 Does SW 3 4 5 4 indicate Hin any feed motor until resolved position m paper select switch assembly m engine interface board m engine control board 3 42 Phaser 7750 Printer Service Manual Tray 1 MPT Size Sensor 7 274 Code An open circuit has been detected in the Paper Size Senor Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Tray 1 MPT Assembly Engine Control Interface Board Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 Is J610 2 between 0 15 and 3 1 VDC Go to step 2 Go to step 3 2 15 J532B 6 between 0 15 3 1 VDC Replace in the Troubleshoot and following order repair the wiring control harness between interface board P J 535 and m engine control P610 board 3 Is 3 3 VDC present at J610 1 Replace the Tray Go to step 4 1 MPT assembly 4 Is 43 3 VDC present at J532B 7 Troubleshoot and Replace in the repair the wiring harness between P J 535 and P610 following order m engine control interface board m engine control board Error Messages and Codes 3 43 Lower Tray Communication Failure Code 88 Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Engine Control Interface Board m Tray module board Engine Control board T
291. re 04 347 pg 3 19 32 Accumulator Belt Edge Sensor Failure 04 348 pg 3 22 33 Unexpected Accumulator Belt Home Sensor Signal 09 350 pg 3 24 34 Accumulator Belt Drive Logic Failure 09 351 pg 3 22 35 Fuser Main Lamp Failure 10 348 pg 3 25 41 Install or Reseat Fuser 10 349 pg 3 26 42 Fuser STS front Warm Time Failure 10 352 pg 3 27 43 Fuser SSR1 On Time Failure 10 353 pg 3 27 44 Fuser Sub Lamp Failure 10 350 pg 3 29 45 Fuser STS rear Failure 10 351 pg 3 30 46 Fuser STS rear Warm Time Failure 10 354 pg 3 31 47 Fuser SSR2 On Time Failure 10 356 pg 3 31 48 Fan Failure 10 398 pg 3 33 60 Imaging Unit Motor Failure Code 60 04 361 pg 3 35 70 Imaging Unit 1 09 360 pg 3 36 71 2 09 361 72 3 09 362 73 4 Communication Failure 09 363 3 10 Phaser 7750 Printer Service Manual Code X Error Message Chain Link Page Black Imaging Unit Motor Failure 04 363 pg 3 37 78 Waste Cartridge Full Detection Sensor Failure 09 358 pg 3 38 80 Engine Logic Board Failure 04 341 pg 3 39 04 343 81 Controller To Engine Communication Failure 04 358 pg 3 39 82 Engine Logic Board RAM ROM Failure 04 340 pg 3 39 04 342 83 Engine Logic Board NVRAM Failure 04 362 pg 3 40 84 Controller to Engine Logic Board Timing Failure 04 371 pg 3 40 85 Engine Logic Board Micro Pitch Failure 04 344 pg 3 40 86 High Voltage Power Supply Failure 04 345 pg 3 40 87 Tray Lift Failure 07 281 pg 3 41 07 282 07 283 07 284 07 291
292. reconfigure the print queue Print the Configuration Page Verify that Printer Server is enabled Set the frame type to the frame type your NetWare server is using Note To determine your NetWare IPX frame type type config at the Novell console screen On networks using multiple IPX frame types it is critical that the frame type be set correctly Verify that the Primary Server is set NetWare 3 1x only The primary server should have been set during initial queue setup and installed using CentreWare DP If it is not set use CentreWare DP to set it then reset the printer Note Setting the Primary Server is extremely important on large networks Go to www xerox com office support if the above steps fail to resolve the printing problem Novell NetWare Troubleshooting Step By Step These procedures eliminate cabling communication and connection problems associated with network connected printers The steps are divided into two groups W Novell NetWare Hardware Step by Step W Novell NetWare Software Step by Step Note Novell NetWare Software Step by Step assumes that you are connected to a Novell NetWare network with a Windows OS installed on the client workstation When both of these procedures are completed print a test page from your software application If the test page prints no further system troubleshooting is necessary General Troubleshooting 4 29 Novell NetWare Hardware Step By Step Note the LE
293. removal of the developer s Tilt the imaging unit plate assembly forward enough to allow the developer s to be removed Do not disconnect the imaging unit plate harnesses 7750 020 1 Partially remove the imaging unit plate assembly 2 A locating pin is at the back of each developer housing assembly that matches a hole in the frame when positioned and seated correctly A slight rotating back and forth of the assembly will help find the locating pin hole in the printer frame Service Parts Disassembly 8 25 Recharging a Developer Housing Assembly Caution If replacing a developer housing assembly write down the new ATC tag number Remove the tear off ATC tag number label and adhere it near the appropriate Imaging Unit connector on the Imaging Unit plate assembly then perform the procedure See ATC Sensor Setup on page 6 14 Note It is easy to spill toner in this procedure Use only a type II toner vacuum to clean up any spilled toner Check the temperature sensitive label on the developer beads If the label has turned dark the beads have been exposed to a higher than expected temperature and should not be used If the developer beads are being replaced for toner clumping also replace the toner cartridge of the effected color The dispense assembly of the effected color should also be purged of all toner before the new toner cartridge is installed Release Tabs 4 Note Wire Routing Under Tab Protect
294. rial to be printed that provides tips on diagnosing print quality problems The tutorial contains examples of various faults that may be encountered and also contains examples of the various color test pages solid fill pages and test pattern page 5 4 Phaser 7750 Printer Service Manual Color Test Pages Selecting Color Test Pages causes a group of seven pages to print as shown in the following two figures This group includes a full page each of 25 CMYK a page of 80 solid fill red a page consisting of 25 tint vertical CMYK bands with each band labeled and finally the test pattern shown in the second figure below Black Cyan Magenta Yellow 7750 184 BH LSGH 5 E E NE 1 LSGH 5 5 Print Quality Troubleshooting 5 5 Analyzing the Test Pattern 1 Color Registration Horizontal The colored lines should match up as shown below If necessary see the registration procedures in Chapter 6 Good Good Bad 6250 501 2 Color Registration Vertical The colored lines should match up as shown below If necessary see the registration procedures in Chapter 6 Good Good Bad 6250 502 3 Uniform RGB The secondary color squares should be uniformly colored with no mottling 4 Density The color squares should have even density from top to bottom 5 6 P
295. rn OFF the printer Remove any debris or foreign objects a Vacuum out any loose toner from the interior of the printer with a Type II toner vacuum only Remove and clean the paper trays 7 Clean pick rollers with a slightly damp lint free cloth 7 2 Phaser 7750 Printer Service Manual Service Parts Disassembly In this chapter m General Notes on Disassembly Chapter 9 Overview This section contains the removal and replacement procedures for selected parts of the printer according to the Service Parts List Not all replacement procedures are included in this Service Manual In most cases to reinstall a part simply reverse the removal procedure shown In some instances the replacement procedure is included because it may contain special steps For specific assemblies and parts refer to Service Parts Lists on page 9 1 Standard Orientation of the Printer for Disassembly When needed the orientation of the printer is called out in the procedure for locating printer parts refer to the printer orientation graphic for locating the right left front and back sides of the printer 7750 242 8 2 Phaser 7750 Printer Service Manual General Notes on Disassembly Before You Begin Any Disassembly Procedure 1 Switch OFF the printer power and disconnect the power cord from the wall outlet 2 Remove the Imaging Units and protect them from exposure to
296. ront Cover PL 10 1 87750 380 No Part number Qty Part Description and part name 3 116 1800 00 Front Cover Assembly COVER ASSY FRONT MN 6 116 1187 00 Strap 7 116 1116 00 ROS Window Cleaning Wand CLEANER ASSY 9 116 1117 00 ROS Window Cleaning Wand Base CLEANER ASSY BASE 12 116 1095 00 Right Hand Cover COVER ASSY RIGHT MN 9 36 Phaser 7750 Printer Service Manual Part List 10 2 Top Cover and Front Panel PL10 2 1 235 zid Top Cover and Front Panel PL 10 2 57750 381 Part number Qty Part Description and part name 1 116 1802 00 Top Cover Assembly TOP COVER 5 116 1803 00 Front Panel CONTROL PANEL 7 116 1805 00 Front Fuser Cover COVER AY F FRONT MN 9 116 1806 00 Link Assembly LINK ASSEMBLY 10 116 1807 00 On Off Switch MAIN POWER SWITCH 11 116 1804 00 Front Panel Wire Harness Service Parts Lists 9 37 Part List 10 3 Rear Cover PL10 3 3 45 Rear Cover PL 10 3 AU y A JL JEN 7150 382 No Part number Qty Part Description and part name 1 Data plate N S 2 Blind Cover 3 116 1954 00 Rear Cover Assembly COVER ASSY REAR 4 Rear Cover p o item 3 5 116 1188 00 Lower Tray Unit Harness Cover COVER BLIND TM 6 116 1189 00 Left Hand Rear Middle Cover COVER L H R MID 7 116 1191 00 Left Hand Rear Lower
297. roubleshooting Procedure Step Actions and Questions Yes No 1 18 J668 1 on the tray module board Go to step 2 Use the wirenets 5 VDC to troubleshoot and repair the open wire 2 18 J668 3 on the tray module board 24 Go to step 3 Use the wirenets VDC to troubleshoot and repair the open wire 3 1 Check the following connectors for Replace in the Check and repair continuity following order broken wires or m P669 1 to J534A 15 m engine control bad connectors m P669 2 to J534A 14 interface board m P669 3 to J534A 13 tray module 669 4 to J534A 12 oard P669 5 to J534A 11 P669 6 to J534A 10 2 Do checks indicate continuity 3 44 Phaser 7750 Printer Service Manual Reflective Sensor Procedure Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Reflective Sensor m Engine Control Board Refer to the figure below during this procedure PWB PL PWB PL DC ROM DOUBLE PLUG SENSOR PL 1 x i i J121 5VDC NEL 13 45406 CONTROL 8 7 6 LOGIC 7750 343 Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Enter service diagnostics and run the Replace the Go to step 2 Reflective Sensor test sensor 2 Does the sensor change state from L to H when blocked 2 1 Measure Pin 2 to ground Go to step 4 Go to step 3 2 Is
298. s and fatal errors will produce an associated numeric code Error messages and codes are generally specific making it important that service personnel and users record errors when reporting problems with the printer Any code associated with an error message or jam can be viewed by pressing the INFO button and scrolling to the bottom of the help text displayed on the front panel Some procedures require performing service diagnostic tests to verify a specific printer part is operating correctly For information on Service Diagnostics and all internal printer test functions refer to Service Diagnostics on page 4 2 To troubleshoot problems not associated with a front panel message or code see General Troubleshooting on page 4 1 When an error first occurs record the error message and code then cycle power to the printer to see if the error recurs Always follow the safety measures detailed in the front of the manual when servicing the printer see Service Safety Summary on page vii Accessing the Printer s Error History If an error message or code is not visible on the front panel and the printer is still capable of printing print one of the following pages from the printer s front panel 1 Engine Error History a Go to Troubleshooting gt Service Tools gt Engine Error History and press OK 2 Jam History a Go to Troubleshooting gt Service Tools gt Jam History and press 3 Service Usage Profile
299. s of Chevron Patterns IBT Belt from bottom Theory of Operation 2 17 The chevron patterns used for the RegiCon setup are shown in the following figure Y N The components of the RegiCon adjustment include m Skew Fine Setup Pattern 1 IN OUT Setup Pattern 1 Center Setup Pattern 1 W Coarse Skew Setup Pattern 2 2 18 Phaser 7750 Printer Service Manual 1 Skew Fine Setup The Skew Fine Setup is performed to ensure that images on the accumulator belt are not skewed To complete this part of the procedure a series of chevron images are developed on the belt using all four colors Pattern on the previous figure shows the chevron patterns The chevron patterns are developed on the belt on the front and rear edges of the accumulator belt The MOB sensors read them and the horizontal and vertical position of the marks are calculated If the marks are found to be skewed the diagnostic tool indicates the number of clicks and direction that the adjustment screws on the front of the ROS should be turned to correct the skew 2 IN OUT Setup Like Skew the IN OUT Setup procedure uses the chevrons that are developed on the front and rear edges of the accumulator belt Pattern 1 on the previous figures shows the chevron patterns During this procedure logic automatically performs a magnification adjustment so that the scan lines are the same length for all four colors 3 Center Setup The Center Setup procedur
300. s of isolating a defective subsystem associated with the image processor board and SDRAM POST returns control to the boot loader and the operating system is loaded The operating system then loads the imaging processing software If POST detected any soft errors a message is printed in a red box on the start page If POST detects any hard errors both the front panel and health LED blink the error code pattern see POST Fault Reporting LED Blink Patterns on page 3 8 POST Startup indications At power on the hardware default is to turn on the IP board health LED The image processor board health LED is turned off The front panel display is reset addressable area becomes The Green LED turns on for 1 3 second The Yellow LED turns on for 1 3 second The Red LED turns on for 1 3 second The front panel LED is turned off The backlight is turned on high intensity with nominal contrast display The front panel display area is turned on dark black for 1 second Error Messages and Codes 3 7 The front panel display is cleared The backlight is turned on with nominal intensity The POST Vn nn message appears and tests are quickly executed If any tests fail the front panel screen freezes with the name of the test displayed and the line posted is Call Customer Service W After the POST tests have finished running the Xerox splash screen is posted to the front panel and PostScript begins init
301. s the name of the part to be ordered and the number of parts supplied per order 5 Parts identified throughout this manual are referenced PL For example PL3 1 10 means the part is item 10 of Parts List 3 1 6 A black triangle preceding a number followed by a parenthetical statement in an illustrated parts list means the item is a parent assembly made up of the individual parts called out in parentheses 7 The notation with X Y following a part name indicates an assembly that is made up of components X through For example 1 with 2 4 means part 1 consists of part 2 part 3 and part 4 8 An asterisk following a part name indicates the page contains a note about this part 9 The notation NS next to a part indicates that particular part is not spared but contained in a kit or major assembly 10 The notation 1 lt gt 2 and P2 is attached to a wire harness It indicates that connector Jack 1 is attached to one end of the wire harness and connector J2 is attached to the other end that is plugged into P2 Note Only parts showing part numbers are available for support Parts not showing part numbers are available on the parent assembly Legend Identifier Meaning C C ring E E ring KL K clip S Screw p o Part of N S Not Spared Service Parts Lists 9 3 Parts List 1 1 Drive Unit PL1 1 1 2 3 16 17 a Nee 15 1 4Pes e lt Ao
302. seconds after the Decurler Cam Clutch has turned on Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Decurler Cam Clutch m Stacker Motor m Finisher Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Rotate the actuator while running the Go to step 2 Troubleshoot Decurler Cam Position test in diagnostics using the 2 Doesthe value change between H and L transmissive sensor procedure 2 Does the decurler cam clutch operate in Check for a Go to step 3 diagnostics mechanical problem with the decurler cam clutch drive If no problem is found replace the clutch 3 Is 24 VDC present at P J 849 1 Replace the Go to step 4 decurler cam clutch 4 Is 24 VDC present at test point 5 on the finisher control board Replace the finisher control board Troubleshoot the 24 VDC interlock circuit 5 5 24 VDC present at P J 847 11 with the Finisher Stacker Motor Down test running in diagnostics Replace the stacker motor Replace the finisher control board Error Messages and Codes 3 59 Finisher Set Clamp Failure Code 123 The set clamp home sensor did not turn on within 2 seconds after the set clamp started operation Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Set Clamp Solenoid Finisher Control Board Troubleshooting Procedure S
303. sed Min A Blocks 24 Min B Blocks 4 Yellow 1 Click CW Magenta 7 Clicks CCW Cyan 7 Clicks CW Black 7 Clicks CCW Note Only 5 lines will be displayed at a time under the Information header Use the arrow buttons to scroll down or up as required to see the rest of the data Note If the block counts are not the same number as presented here the printer has a print quality problem See Streaks in Direction of Paper Travel on page 5 17 to resolve the print quality problems before proceeding further with RegiCon If an adjustment is needed adjust by the amounts displayed on the front panel until all clicks displayed are 5 or less Note If RegiCon 1 Fine Skew test fails see RegiCon 4 Coarse Skew Adjustment on page 6 10 Adjustments and Calibrations 6 7 6 After 2 minutes the test selection menu will re appear To examine the test results after this occurs highlight the appropriate test and press the Information button The display results are the same as previously except that Do 1 Fine Skew Setup appears as the first text below the line RegiCon 2 In Out Skew Adjustment This test makes magnification adjustments for registration Magnification is the length of the scan line for the four colors so that each scan line for each color is the same length The data output can indicate PASSED or READJUST PASSED or FAILED If the result is READJUST the indicated adjustment values for the skew adjustment sh
304. see Troubleshooting AC Power on page 4 16 2 Remove the image processor board cover and metal plate Disconnect the relay board power connector J300 3 Switch the printer on Check for 3 3 VDC at J510 1 2 and 5 Check for 5VDC at J511 2 3 and 4 and J511 3 6 and 7 If 5 VDC is present check for 24 VDCDC at J505 1 4 If no DC voltages are present see Troubleshooting AC Power on page 3 87 5 If 5 VDC is present but 3 3 VDC is not see Troubleshooting the 43 3 VDC and 2 5 VDC Low Voltage Power Supplies on page 4 18 6 If 3 3 VDC is present but 5 VDC and 24 VDC are not see Troubleshooting the 3 3 VDC and 2 5 VDC Low Voltage Power Supplies on page 4 18 If 5 VDC is present but 24 VDC is not see Troubleshooting the 24 VDC LVPS on page 4 18 General Troubleshooting 4 17 Troubleshooting the 3 3 VDC and 2 5 VDC Low Voltage Power Supplies Note Switch off power and disconnect the power cord Actions Remove the rear cover and rear shield Disconnect the harnesses to connectors P505 P510 P511 and 2nd BTR on the T1 HVPS remove 3 screws and lower the T1 HVPS Connect AC Power and switch the printer ON N Check for proper AC voltage at the connector at the bottom of each LVPS If not present go to the Troubleshooting AC Power section link Check for 3 3 VDC or 5 VDC at the connector at the top of the LVPS If correct voltage is not
305. sembly 8 35 Laser Unit ROS Remove the rear cover see page 8 6 Remove the right side cover see page 8 4 Disconnect the wiring harnesses at engine board P400 and 401 Undo the retainers and undo the wiring harness Note Observe the routing of the laser unit wiring harness up to the engine control board the information will be needed during reassembly 5 Remove the 2 screws securing the laser unit in the printer Caution The laser unit is heavy 6 Pull the laser unit out of the printer 8 36 Phaser 7750 Printer Service Manual Replacement Procedures Note You must perform the RegiCon adjustment procedures after replacing the Laser Unit see RegiCon Adjustment Procedures on page 6 5 Note Store the NVRAM values to the hard drive after calibration See Store Engine on page 6 21 ROSH loig ROSE 4414514918 ROS 28 connect the cables when ROS is out inthe Service Manual CAUTION LASER RADIATION Invisible Laser Radiation Do not connect the cables when ROS is outside the machine FOR SERVICE Follow replacement instructions in the Service Manual This ROS is a component for Xerox Products and s exempt and does not comply with the requirements of the Federal Laser Product Performance Standard 21 CFR 1040 and IEC 825 There field adjustments or replacement items inside This unit is to be opened only at authorize
306. ser 7750 Finisher on page 11 1 14 5 in 160 4 cm 63 1 in 106 1 41 8 in 7750 224 General Information 1 9 Mounting Surface Specification These specifications apply to any Phaser 7750 printer used as a table top printer without a lower tray assembly or cart There are 4 feet on the bottom of the printer The right hand side of the printer is more susceptible to problems due to foot placement 1 In order to function properly the printer must be located on a surface with the following minimum dimensions All 4 feet must rest squarely on the mounting surface A 485 mm Min 19 10 in 530 mm Min gt 20 87 in 7750 339 2 Mounting surface flatness must be within the range shown in the following Right Hand Side figure 5mm Max 7750 340 1 10 Phaser 7750 Printer Service Manual 3 The printer must not be tipped or tilted more than is shown in the following figure 5mm Max 7750 341 Failure to adhere to these mounting specifications will void all guarantees of print quality and or performance Known problems that can occur as a result of exceeding the mounting surface specifications are Color to Color mis registration primarily in the horizontal laser scan direction A smear or band of toner approximately 40 mm from the trailing edge of the print General Information 1 11 Functional Specifications Charact
307. ss OK 2 Highlight Service Tools and press OK 3 Press the Up and Down Arrow buttons simultaneously to enter the Hidden Service menu Highlight Run Service Diagnostics and press OK to enter Service Diagnostics Highlight NVRAM Access and press OK Highlight Store Engine NVRAM and press OK Select the specific entry desired Yes or No and press OK oc Adjustments and Calibrations 6 21 6 22 Phaser 7750 Printer Service Manual Cleaning and Maintenance In this chapter Service P tive Mai m Recommended Tools Cleaning Chapter Service Preventive Maintenance Procedure Perform the following procedures whenever you check service or repair a printer Cleaning the printer as outlined in the following steps assures proper operation of the printer and reduces the probability of having to service the printer in the future The frequency of use and the type of paper a customer prints on determines how critical and how often cleaning the machine is necessary Record the number of sheets printed Recommended Tools Toner vacuum cleaner Type Clean water Clean dry lint free cloth Black light protective bag Cleaning Caution Never apply alcohol to any parts in the printer Never use a damp cloth to clean up toner Caution If you remove the Imaging Unit place it in a light protective bag Record number of sheets printed Print several sheets of paper to check for problems or defects Tu
308. stic test 4 6 blank prints troubleshooting 5 14 BTR Sensor diagnostic test 4 7 calibrations 6 1 Card Cage disassembly 8 40 center setup theory of 2 19 center skew 6 4 Chain Link definition of 3 5 definitions of 3 5 index table 3 10 charge and exposure wiring diagram 10 62 charging 2 2 Clean Accumulator Belt diagnostic test 4 12 clean fuser diagnostic test 4 12 cleaning 2 2 7 1 clear tech rep faults 6 20 diagnostics 4 12 clearance 1 9 Clutch Tests diagnostics 4 11 Phaser 7750 Printer coarse initialization 6 12 Coarse RegiCon initialization diagnostics 4 12 coarse skew 6 3 Color Registration Control wiring diagram 10 43 configuration diagnostics 4 3 consumables diagram 1 8 life counters 1 8 Controller to engine communications failure code 81 3 39 CRU Life Counters diagnostics 4 12 D damaged prints troubleshooting 4 21 DC Power Generation 24VDC wiring diagram 10 36 DC Power Generation 3 3 VDC disassembly 10 34 DC Power Generation 5VDC wiring diagram 10 35 Developer Clutch diagnostic test 4 11 Developer Drive disassembly 8 51 Developer Housing Assembly disassembly 8 25 Developer Motor diagnostic test 4 10 development 2 2 dimensions 1 9 DIP Switches 4 3 Dispense Assembly disassembly 8 20 Dispensor Motor diagnostic test 4 10 Doors troubleshooting 4 15 Drives theory of 2 11 Drum Drive Control Index 2 wiring diagram 10 59 Drum Drive Contro
309. t Corner Or the Staple Front Corner Sensor remained ON when starting the move to the Front Corner Error Code 119 The Staple Front Corner Sensor did not turn OFF within 2 seconds after starting to move from the Front Corner Or the Staple Front Corner Sensor does not turn OFF after the move from the Front Corner was completed Troubleshooting References Applicable Parts Wiring and Plug Jack Map References Finisher Control Board m Staple Move Motor Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Manually move the staple head Go to step 2 Diagnose and 2 Does the head move smoothly from front repair the to rear mechanical defect 2 1 Check the Stapler Front Corner Sensorin to step 5 Use the diagnostics transmissive 2 Does the value change from L to H Sensor procedure to diagnose and repair the sensor 3 1 Defeat the front door interlock switch Replace the Go to step 4 then run the Stapler Move Front or Move finisher control Rear motor test in diagnostics board 2 Does the stapler move motor run 4 18 24 VDC present at P847 4 Replace the Go to step 5 stapler move motor 5 18 24 VDC present at test point 9 on the Replace the Troubleshoot and finisher control board finisher control board repair the 24 VDC interlock circuit Error Messages and Codes 3 57 Finisher Eject Clamp Home Sensor On Failure Code 120 Finisher Eject Clamp Home Sensor Off
310. t Y As an Example 118 08 7 8 2 988 04409 SdAH 01 NIW Woy 104 NOW suonearunuiuioo Aq uo 0 10109 Ayana 18 151 SMOJE 160 600 09190 uo Buruan 1 pue 40 10 151 suuojied 101009 SdAH 0 ALON YOLINOW A 818 LSE 005 600 09190 gt gt gt 48929019 201925 5 ia gi X uNI 20925 i woo 20 1 0999 T 1 1 gt T 1 1 4 21 2 zi8 YILNI 9 9 0290 OIA i 8Md 3 1 woo 2 woo 20 1 woo 20 OIA 1 0290 TA 4 ON9890 WW p 19 0 19 1 QN9990 IVNV YOLINOW SS Joop i 4 BA A 818 151 A 151 6 JONON 1002 6001 09190 1190 6001 09190 BOINON LLL 108 1002 6001 00130 70109 2 151 5 u3M0d eld INOZ 04 A 151 1614 948181 SL 1041102 SdAH SdAH 1614 91 SdAH 10 73 A n 021938 0 6 03401830 A 20V 5 40 016 926 G31VNIAVINOO
311. t several points in this product To avoid personal injury do not touch exposed connections and components while power is on Disconnect power before removing the power supply shield or replacing components Do not wear jewelry Remove jewelry prior to servicing Rings necklaces and other metallic objects could come into contact with dangerous voltages and currents Power source This product is intended to operate from a power source that will not apply more then 264 volts RMS for a 220 volt AC outlet or 140 volts RMS for a 110 volt AC outlet between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation Warning Labels Read and obey all posted warning labels Throughout the printer warning labels are displayed on potentially dangerous components As you service the printer check to make certain that all warning labels remain in place Safety Interlocks Make sure all covers and the printer s front panel are in place and all interlock switches are functioning correctly after you have completed a printer service call If you bypass an interlock switch during a service call use extreme caution when working on or around the printer CLASS 1 LASER PRODUCT The Phaser 7750 Color Laser Printer is certified to comply with Laser Product Performance Standards set by the U S Department of Health and Human Services
312. t through the waste cartridge sensor and the four imaging unit connectors 5 If 5 VDC is present then replace the engine control board 4 20 Phaser 7750 Printer Service Manual Media Jams and the Paper Path Media Based Problems Print the Paper Tips page from the printer s front panel for a list of the supported media types and weights The customer should be using a quality laser printer paper The printer may have trouble picking smooth finish paper Verify the tray and the printer support the media being used by the customer Not all supported types can be used from all trays Only Phaser 45 Series Transparency Film should be used in this printer Inspect the paper for bent torn or folded corners Ensure that the media type matches the settings at the front panel Ensure that the paper guides are set correctly Multiple Sheet Pick 1 Ensure that the paper is in good condition and appropriate for a laser printer quality office laser printer paper works best 2 Ensure that the printer is within its environmental specifications by using the built in service diagnostics temperature test 3 Ensure that the paper is correctly loaded in the tray and the tray has not been over filled Try loading paper from a fresh ream or flip the paper over Clean the pick rollers with a clean slightly moistened lint free wipe Replace the paper pick rollers Check the tray s retard roller for damage
313. tep Actions and Questions Yes No 1 1 Check the Set Clamp home sensorin Go to step 2 Use the diagnostics transmissive 2 Does the value change from H to L Sensor procedure while rotating the actuator to diagnose and repair the sensor 2 Does the solenoid energize when running Go to step 3 Go to step 4 the Set Clamp Paddle test in diagnostics 3 1 Run the Eject Forward Test and then Replace the Go to step 4 the Eject Release Test in diagnostics finisher control 2 Does the set clamp paddle turn once board 4 Is 24 VDC present at P848A 10 Go to step 5 Go to step 6 5 Is 24 VDC present at P848A 11 Replace the Replace the set finisher control clamp solenoid board 6 Is 24 VDC present at test point 9 on the Replace the Troubleshoot and finisher control board finisher control repair the board 24 VDC interlock circuit 3 60 Phaser 7750 Printer Service Manual Finisher Communication Failure Code 124 There are no diagnostic routines for problems involving serial communications It is recommended that you address the following assemblies in this order Finisher Control Board Engine Control Board Perform continuity checks on any wiring harnesses involved Finisher Staple Mode Logic Failure Code 125 There are no diagnostic routines for problems involving serial communications It is recommended that you address the following assemblies in this order Stapler Assembly Engine Control Board Perform co
314. ter Service Manual Finisher Specifications Category Specification Configuration User installed option The finisher provides stapling up to 50 sheets print job offset and stacking up to 1 000 sheets of paper The finisher docks with the printer and stand All finisher operations are controlled by the finisher control board Paper feed Paper leaving the exit section of the printer is fed to the paper catch area then directly into the horizontal transport The horizontal transport then delivers the paper to the finisher where stapling offsetting jogging and stacking occur Power The printer provides 24 VDC to the finisher The finisher s power supply requirements provides all required DC voltages throughout the finisher option The Phaser 7750 Light Finisher shall meet FCC part 15 subpart B Class A CISPR22 Class A Dimensions shown in mm 7700 376 Media Types Long Edge Feed LEF Short Edge Feed SEF 5 4 4 Letter B4 8 x 10 Letter US Folio Legal Tabloid Media Weight 64 105 g m Thick Thin paper 11 3 Category Specification Stacker Capacity 1000 non stapled sheets 20 Ib paper letter A4 or smaller 500 unstapled sheets 20 Ib paper over size Letter A4 300 unstapled sheets Mix Stack loading large on small 50 stapled sets Staple Cartridge 5000 staples Capacity 11 4 Phaser 7750 Printer Service Manual Finisher Assemblies Stapl
315. the fuser Assembly assembly 2 Measure the resistance between the fuser connector P600 4 and P600 6 3 Does the resistance measure between 30 K and 190 K Ohms 2 1 Reinstall the fuser assembly Replace the Go to step 3 2 Enter service diagnostics engine control 3 From the Sensor Tests run the Fuser board Temperature test 4 15 the temperature indicated approximately 165 C 3 1 Turn OFF printer power Replace the Repair or replace 2 Check for an open circuit or poor engine control the wiring connection between J600 4 to J600 6 board harness to J404A 2 3 Is the wiring OK 3 26 Phaser 7750 Printer Service Manual Fuser STS Front Warm Time Failure Code 42 Main heater warm up error The temperature did not reach the Ready temperature within the specified time Fuser SSR1 On Time Failure Code 43 The main heater remained ON for more than the specified time Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Fuser m Engine Control Board Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Turn OFF power remove the Fuser Go to step 2 Replace the fuser Assembly and allow it to cool down assembly 2 Measure the resistance between the Fuser connector P600 4 and P600 6 3 Doesthe resistance measure between 30 K and 190 K Ohms 2 1 Measure the resistance between fuser Go to step 3 Replace the fuser connector P6
316. there 5 VDC 3 1 Check the wire between Pin 2 Replace the Repair or replace engine control board Pin 8 for an open board the wiring circuit or poor contact harness 2 Is the wiring OK 4 1 Is there 5 VDC between sensor Pin 1 Replace the Go to step 5 and Pin 3 sensor 5 1 Is there 5 VDC between engine Go to step 6 Replace the control board Pin 4 and Pin 5 engine control board 6 1 Check the wiring to Pin 4 and sensor Replace the Replace the Pin 1 and Pin 5 to sensor Pin 3foran engine control wiring harness open or poor circuit board 2 Is the wiring OK Error Messages and Codes 3 45 Transmissive Sensor Procedure Troubleshooting References Applicable Parts Wiring and Plug Jack Map References m Transmissive Sensor m Engine Control Board Refer to the following figure during this procedure PWB PL DOUBLE PLUG DC ROM SENSOR PL 3 d DC ROM amp 0 506 1 45VbC CONTROL 8 7 6 LOGIC 7750 342 Troubleshooting Procedure Step Actions and Questions Yes No 1 1 Enter service diagnostics and run the Replace the Go to step 2 Transmissive Sensor test sensor 2 Does the sensor change state from L to H when blocked 2 1 Remove the sensor connector Replace the Go to step 3 2 Does the sensor now change state Sensor 3 1 Check for short between sensor P
317. they successfully engage the interface board bracket Mis alignment prevents a good connection to the interface board 1 Tilt and insert the electrical chassis under the two loosened screws 2 Carefully lower the assembly onto the engine control interface board connector 3 Push lightly in the center of the assembly to ensure the assembly is fully seated If board is reasonably stable the board is properly placed 4 Continue installation by reversing the removal procedures Caution Ensure that all connections are firmly seated pay special attention to the laser unit connections on the printers right side and to the Interface Board Note After replacement of the engine control interface board perform the Diagnostic Engine NVRAM Reset on page 6 20 Service Parts Disassembly 8 41 Engine Control Board 1 Store the engine board NVRAM values to the hard drive See Store Engine on page 6 21 Remove the electrical card cage assembly see page 8 40 Disconnect the orange ribbon cable at the engine board Remove the 8 screws securing the engine control board metal shield and remove the shield Remove the remaining 6 screws and remove the engine control board Engine Control Board E S oN D 7750 250 Replacement Procedures 1 Caution When reinstalling the engine control board be sure to fully seat connector P460 Write the stored NVRAM values to the engine bo
318. tions 1 Check the AC input voltage at the outlet 2 3 Reconnect AC power If the GFI trips immediately with the power switch OFF disconnect AC power remove the rear cover and metal shields Check for shorts in the AC Circuit from the GFI to the noise filter the AC driver board and up to the power switch Switch the printer on If the GFI trips unplug the printer remove the fuser then retest Remove the rear cover and the two metal shields Connect AC Input and switch the printer on Check for AC voltage at J72 on of the GFI if not present replace the GFI b Between FS76 and FS77 of the Noise Filter if not present replace the noise filter c Into and out of the power switch if not present replace the power switch d The connector at the bottom of the 3 3 VDC 5 VDC and 24 VDC LVPS if not present replace the AC drive board 4 16 Phaser 7750 Printer Service Manual Troubleshooting the Low Voltage Power Supplies 3 3 VDC 5 VDC and 24 VDC voltages are supplied by individual low voltage power supply boards The 24 VDC LVPS requires the presence of a 5 VDC enabling signal to operate Note Before troubleshooting power supply problems disconnect the lower tray deck or finisher if installed and restart the printer Verify the problem is still present or refer to the appropriate option troubleshooting section 1 Verify the printer is plugged in and the GFI is not tripped if it is
319. tive assembly from its anti static bag place it on a grounded conductive surface If the anti static bag is conductive you may ground the bag and use it as a conductive surface Do not use freon propelled chemicals These can generate electrical charges sufficient to damage some devices Do not remove a replacement component or electrical sub assembly from its protective package until you are ready to install it Immediately before removing the protective material from the leads of a replacement device touch the protective material to the chassis or circuit assembly into which the device will be installed Minimize body motions when handling unpackaged replacement devices Motion such as your clothes brushing together or lifting a foot from a carpeted floor can generate enough static electricity to damage an electro statically sensitive device m Handle IC s and EEPROM s carefully to avoid bending pins attention to the direction of parts when mounting or inserting them on Printed Circuit Boards PCB s vi Phaser 7750 Color Laser Printer Service Safety Summary General Guidelines For qualified service personnel only Refer also to the preceding Power Safety Precautions Avoid servicing alone Do not perform internal service or adjustment of this product unless another person capable of rendering first aid or resuscitation is present Use care when servicing with power Dangerous voltages may exist a
320. tput Check in diagnostic mode compares a target value in logic to the value seen by the individual sensors If the value seen by the sensors is between 20 and 20 of the target value the printer density is correct If the test values shown below displayed on the front panel all equal zero the test has detected no problems Result 0 Stop Status 0 ADC Sensor Fail 0 ADC Shutter Fail 0 If the ADC Sensor Fail test detects a problem check the connector to the sensor If the connector is OK replace the sensor 2 26 Phaser 7750 Printer Service Manual If the ADC Shutter Fail test detects a problem check the connector and the shutter for a binding or out of position condition If these actions do not resolve the problem replace the MOB Assembly If the following values all equal none the test has detected no problems LD Illum Warn None ADC Patch Fail None VBCR Warn None V Bias Warn None If Ave RADC Trans is within 20 of RADC Target then printer logic assumes the density is correct Values on the front panel are Front Panel Message Typical Values RADC Target XXX YMC 375 394 460 Ave RADC Trans within 20 of RADC Target YMC 369 393 467 Ideal LD XXX YMC 335 361 394 V Bias XXX 887 V BCR 0 0 Theory of Operation 2 27 Lower Tray Feeders Sensor and Board Locations LTD Board 3T HCF Board TT
321. ttings 6 16 Phaser 7750 Printer Service Manual Restore Factory Settings Margins You can reset margin settings to the factory default values Caution Use caution when resetting margins to the factory default settings Changing these settings back to factory defaults may not be the last saved settings if you have previously calibrated your margins 1 From the Main Menu highlight Printer Setup and press OK 2 Highlight Calibration Setup and press OK Note An alternate access pathway from the Main Menu is Troubleshooting Print Quality Problems 3 Highlight Calibrate Colors and press OK 4 Highlight Calibrate Margins and press OK 5 Highlight Restore Factory Settings and press OK to reset the margin settings Resetting All Printer Default Settings NVRAM Resetting the NVRAM resets all printer values including network printer setup job defaults color margin and paper calibrations 1 From the Main Menu highlight Troubleshooting and press OK 2 Highlight Service Tools and press OK 3 Highlight Reset NVRAM and press OK 4 Highlight Reset NVRAM and Reset Printer NOW and press OK to reset all the settings to default Resetting Engine NVRAM Resetting restoring the engine NVRAM values resets the RegiCon color margin and A4 B5 selection paper settings to default This is NOT the diagnostics reset 1 From the Main Menu highlight Troubleshooting and press OK 2 Highlight Service Tools and press OK 3
322. tup Page to verify the hard drive application and driver settings From the front panel s Information Pages Menu select Configuration Page or Startup Page Is the correct weight paper loaded in the tray Ensure that the paper guides are set to the correct position for the paper loaded in the tray Try printing from the other trays If the problem only occurs from one tray clean the rollers in that tray Run the Calibrate Margins routine 3041 54 From the front panel s Printer Setup Menu select Calibration Setup then select Calibrate Margins 5 26 Verify that Tray 1 MPT or Tray 2 has not been inadvertently set to custom width while standard sized paper is installed Verify that the front Tray 1 MPT guide is in the correct position Phaser 7750 Printer Service Manual Residual Image or Ghosting There are faint ghostly images appearing on the page The images may be either from a previous page or from the page currently being printed The printer displays no error code 1 7 Make sure that the paper loaded in Ensure that genuine Xerox toner is If the problem continues set the Make sure that the paper you are using is the correct type for the printer and is correctly loaded in the printer From the front panel s Information Pages Menu select Paper Tips Page the tray matches the paper type selected on the printer s front panel insta
323. ual disassembly 8 49 Main Lever disassembly 8 54 Main Motor diagnostic test 4 8 Main Motor Drive Control wiring diagram 10 39 Main Power wiring diagram 10 31 Main Power 2 of 2 wiring diagram 10 32 maintenance diagnostic test 4 12 Mark On Belt MOB Sensor disassembly 8 30 media jams troubleshooting 4 21 media specifications 1 13 Mis pick troubleshooting 4 21 Motor Tests diagnostics 4 8 multiple sheet pick troubleshooting 4 21 N NVRAM resetting 6 16 storing 6 21 NVRAM Access diagnostics 4 12 Offset Motor diagnostic test 4 10 OHP Sensor diagnostic test 4 6 operating system troubleshooting 4 23 Optional Feeder troubleshooting 4 15 Index 5 Paper Feed Motor LTA HCF disassembly 8 61 Paper Feed Motors diagnostic test 4 9 paper feed sensing 2 5 Paper Feeding wiring diagram 10 54 Paper Lift Motor diagnostic test 4 9 disassembly 8 17 Paper on Belt POB Sensor diagnostic test 4 6 Paper Path service diagnostic tests for 4 4 theory of 2 4 troubleshooting 4 21 Paper Path No Pick Motor diagnostic test 4 10 Paper Pick Rollers Tray 1 disassembly 8 10 paper present sensing 2 6 paper size sensing 2 5 Paper Transportation wiring diagram 10 55 Paper Select Switches LTA HCF disassembly 8 60 Plug Jack Locator Maps 10 10 POST 3 7 diagnostic test descriptions 3 9 fault reporting 3 8 faults 3 8 LED blink patterns 3 8 startup indications 3 7 PostScr
324. ubleshooting 4 25 Macintosh Troubleshooting 4 27 Novell NetWare Troubleshooting 4 28 5 Print Quality Troubleshooting Print Quality Problems 5 2 Defects Associated with Specific Printer Components 5 2 Front Panel Test Prints 5 4 Troubleshooting Print Quality 5 4 Color Test 0 5 5 5 Analyzing the Test 5 6 Solid Fill Pages 5 7 Repeating Defects 5 8 Remove Print Smears 5 8 Engine Test PINNIS 2 da dates ee ded ws 5 9 Paper Path Options 5 9 Print Laser 5 9 Print 5 10 Print Grid det eee beth ede OY baie do bs 5 10 Print Fast Scan 8 5 11 Initial Actions Before troubleshooting any Print Quality Problems 5 12 6 Adjustments and Calibrations Registration Control RegiCon Adjustment Overview 6 2 Coarse and Fine Skew 6 3 In Out Skew 6 3 Center Skew
325. ubleshooting 4 11 Test Front Panel Display Test Operation Definition ADC Output Check Measuring Result 0 Stop Status 0 ADC Sensor Fail 0 ADC shutter Fail 0 This tests the Automatic Density Correction sensor Tone Up Down Measuring Result 0 Status 0 ATC Sensor Fail None ATC Limit Warn None ATC Change Warn None This tests the Automatic Toner Calibration sensor Laser Power Check M OK C OK K OK YMCK OK YMCK CycUp OK This tests the laser output PWM Mapping Data Read Coarse RegiCon Init See Coarse RegiCon Initialization on page 6 12 Maintenance Engine maintenance functions Clean Fuser Fuser Cleaning Sheets Runs five sheets of paper through the fuser from the default tray Clean Accumulator Belt Do you wish to continue Yes No Motor On Motor Off Please cycle power to the printer now CAUTION To avoid damaging the Accumulator Belt it is recommended that you leave the belt cleaner installed and perform the Belt Edge Learn test instead see RegiCon 1 Fine Skew Adjustment on page 6 7 NVRAM Access You can read or reset selected NVRAM address locations For all NVRAM access tests see Service Diagnostics NVRAM Resets on page 6 19 PostScript NVRAM Reset See Service Diagnostics NVRAM Resets on page 6 19 Clear Tech Rep Faults Clear lt 4 36 gt Clear lt 9 380 9 383 gt Cl
326. uces drum potential at that point thus reducing the attraction of additional toner particles This process is performed simultaneously for YMCK 4 Primary Transfer Drum gt Accumulator Belt All four toner images formed on the individual drum surfaces are transferred to the accumulator belt sequentially to create a complete 4 color toner image The accumulator belt is conductive and receives a high positive charge from the HVPS The negatively charged toner image on each drum surface is attracted by the high positive potential and transfers to the accumulator belt During this transfer the remaining negative charge on the drum is neutralized by the high positive charge on the belt 5 Cleaning The drum cleaner consists of a blade and a brush in contact with the drum after the point where the toner is transferred to the accumulator belt The cleaner brush receives a high positive voltage from the HVPS allowing it to electrically attract any toner particles remaining on the drum Toner remaining on the accumulator belt after the image transfer to the print media is removed by the belt cleaner assembly and transferred to the waste bin 2 2 Phaser 7750 Printer Service Manual 6 Secondary Transfer The image on the accumulator belt is transferred onto the print media using the voltage supplied by the transfer roller The conductive transfer roller receives a high positive voltage from the HVPS that puts it at a higher potential than the accu
327. uo 108496 9 pea des ayesado usaop 120 21 02220 9 SILON 0220 TA 2 04838 314915 TWNOIS 03838 8LLZL 314415 MOT 1802 211 08620 YOSNAS 114415 9 HA 1 woo 20 805135 AQV3u 314418 gt 5 035 35 81101 uOSN3S 114418 602 21 08520 HOSNaS 314115 1 1 TA SS 2387 1 9887 5 woo 2d HOSNAS WOH QV3H 314918 20188 02 21 08690 woo 2 QV3H 31918 988 2086 YOLON 314418 1 340 38019 3010 11418 340 120 21 08590 1 390 35012 HOLOW 114418 340 120 24 08590 901083 1 1340 38019 HOLOW 114918 35012 020 21 08894 188 1 340 35012 3010 114418 48010 020 21 06690 0314415 on YOLOW 314418 em zu 207 1910 Y3HSINIS 1041102 114418 8 21 62114 ASSY 114418 13S 01140109 Phaser 7750 Printer Service Manual 11 36 Set Eject
328. ure Step Actions and Questions Yes No 1 1 Enter service diagnostics Go to step 6 Go to step 2 2 Run the Stapler Home sensor test 3 Does the value change from H to L when the stapler is moved away from the home position 2 1 Measure the voltage between finisher Replace the Go to step 3 board connector P852 2 and frame finisher control ground board 2 Does the voltage change between 0 and 5 VDC when the sensor is blocked and unblocked 3 1 Measure the voltage at the Finisher The home sensor Go to step 4 Board connector P852 1 or the wiring is 2 Dose the voltage measure 5 VDC bad Replace the staple unit assembly 4 1 Disconnect the Stapler Unit Assembly Replace the Go to step 5 2 Measure the voltage between the stapler unit finisher board connector P852 1 and assembly frame ground 3 Does the voltage measure 5 VDC 5 15 24 VDC present at either J847 7 or Replace the Troubleshoot and J847 9 finisher control repair the board 24 VDC interlock circuit 6 1 Enter service diagnostics and run the Replace the Go to step 7 Stapler Close Motor test finisher control 2 Does the stapler motor operate board correctly Error Messages and Codes 3 49 Troubleshooting Procedure Continued Step Actions and Questions Yes No 7 With the Stapler Close Motor test running Replace in the Troubleshoot and is 24 VDC present at J847 7 following order repair the stapler h
329. ution When reinstalling ensure that the assembly seats against the frame and rotate the main drive to ensure the gears move freely Service Parts Disassembly 8 51 Imaging Unit Drive Assembly Remove the rear cover see page 8 6 Remove the right side cover see page 8 4 Remove the 3 3 VDC and 5 VDC Low voltage power supply see page 8 44 Remove the 24 VDC Low voltage power supply see page 8 46 Remove the T2 High Voltage power supply see page 8 47 Remove the engine control interface board and bracket see page 8 43 fF OND Disconnect the wiring harnesses 1 to YMC and to K to the Print Engine Drive Assembly 8 Remove the 2 screws securing the finisher connector now accessible after removing the right cover assembly and let it hang loose 9 Remove 1 screw that is accessible through the frame access hole near the finisher connector 10 Remove the remaining 7 screws that secure the imaging unit drive assembly to the printer frame 11 Lift the imaging unit drive assembly up and out of the printer Note Some wires will have to be removed from their clamps to clear the drive assembly 7 7750 122 8 52 Phaser 7750 Printer Service Manual Tray 2 Paper Select Switches Remove the and high voltage power supply Remove the 3 3 VDC and 5 VDC low voltage power supplies see page 8 44 Disconnect the wiring harness from the Tray 1 paper select switches A Q
330. valid file with no errors Click OK The file is sent to the printer If the document does not print review the Novell Menu settings on the Configuration Page Verifying the Network Settings 1 2 3 4 At the CentreWare DP main screen click the Printer drop down list click Properties then click Connections Click the Network Card tab A new dialog box displays information about frame type and connectors Verify that the printer is enabled and the connector and frame type are correct If changes are made reset the printer from the front panel Re print a test page If the test print does not print go to www xerox com office support General Troubleshooting 4 31 4 32 Phaser 7750 Printer Service Manual Print Quality Troubleshooting In this chapter m Print Quality Problems Overview ront Panel Test Prints F W Service Test Prints m Print Engine Only Test Print P rint Quality Troubleshooting Chapter 5 Print Quality Problems Overview Print quality defects can be attributed to printer components consumables media internal software external software applications and environmental conditions To successfully troubleshoot print quality problems as many variables as possible must be eliminated The first step is to generate prints using printable pages embedded in the printer on laser paper from the approved media list The paper should be from an unopened ream that has been accli
331. vice Manual 10 56 Tray Module Paper Transport Drive Control 682 0922 IAG v TION 39019 Are NO 010 1 AVMY 39019 AVZ NO 2 HOLOW AVMV XUNIWL AUNI WL 20 SS WL 20 39019 NO 2801011 AYMY 99119 28010 1 0010 NO mn HOLOW TA 39019 Ape NO L YOLOW TA L7 2 30010 NO U010N ILNI WL 1 JUNI WL 1 3N DIL 1 NUNI woo 09 52 9 rS 2 9070 NO 114010 2L 02 09 TA 1 9070 NO 9284 DIL 101011 YOLOW AMIN NIV 318000 27 2 2 108103 3180 1409 34 4 310001 AVUL 78 10 57 Registration nm 8 76 9 062 0922 aur jemi 64018 uonesado 98 pejejap 51 ye umous 034 uey 19440 Aue j 9951001 pue NO 108096 lay 09502 10 59121900 y 108096 Moy Aq 095095 si 90 1
332. wo minutes for the printer to go through a self test then log onto the network server Print out another copy of the Configuration Page to verify that the items you modified were set and kept Novell NetWare Software Step By Step 1 Verify that CentreWare DP and a Phaser printer driver have been loaded on the workstation 4 30 Phaser 7750 Printer Service Manual 2 Click Start click Settings then click Printers to verify that the printer is installed Launching CentreWare DP 1 2 Click Start click Programs then click CentreWare DP Select the desired printer If a communications error message appears your printer is not able to communicate with your workstation Verify your printer s settings then return to this document With the printer selected click the Printer drop down list then select Advanced Setup Select one of the following connection methods Novell Directory Services Bindery Verify that the information displayed is also contained on the Configuration Verify these items a The queue name of the Phaser printer is set to service If necessary create a new queue to test the printer b The Primary Server lists the server name on the Configuration Page Printing a Document 1 2 3 Click the Tools drop down list Select the Send File menu item then select the appropriate directory and file for downloading Verify that this is a
333. y J612 Map 3 9 Inverter Transport Assembly 10 6 Phaser 7750 Printer Service Manual Plug Jack Map Number Item No 612 17 3 Developer Motor Tray 2 Size Switch J613 Map 3 10 Inverter Transport Assembly P613 Map 17 5 Developer Motor Tray 2 Size Switch 614 Map 1 18 Xerographic 617 Map 19 6 Left Lower Assembly Tray 2 Feeder 619 Map 1 1 Xerographic 620 Map 5 6 Registration Transport Assembly 622 Map 1 22 Xerographic 623 Map 19 5 Left Lower Assembly Tray 2 Feeder 624 Map 1 21 Xerographic P626 Map 3 13 Inverter Transport Assembly J626 Map 4 2 Duplex Transport Assembly 631 Map 1 23 Xerographic J633 Map 3 3 Inverter Transport Assembly P633 Map 3 7 Inverter Transport Assembly 639 Map 16 5 PWB MAIN Motor LVPS T2 J640 Map 3 11 Inverter Transport Assembly P640 Map 17 6 Developer Motor Tray 2 Size Switch 641 Map 16 6 PWB MAIN Motor LVPS T2 646 Map 17 8 Developer Motor Tray 2 Size Switch 668 Map 12 15 HVPS T1 T3 24V LVPS 669 Map 12 16 HVPS T1 T3 24V LVPS 670 Map 20 9 TT Module Tray 3 4 feeder 672 Map 20 7 TT Module Tray 3 4 feeder 674 Map 23 9 TT Module rear J800 Map 31 8 Finisher rear 1 Of 2 P800 Map 16 21 MAIN Motor LVPS T2 801 Map 12 5 HVPS T1 24V LVPS 814 Map 20 5 TT Module Tray 3 4 feeder 815 Map 20 4 TT Module Tray 3 4 feeder 816 Map 22 5
334. zontal transport covers see page 11 12 Remove the KL clips from the horizontal transport in and out Remove the bearings from the horizontal transport in and out shafts Remove one end of each horizontal transport belt roller support a Ff Q N Remove the belts Replacement Note When reinstalling the belts ensure that the textured side is out Note If necessary remove the KL clip and gear from the out roller to reinstall the belts to help install the bearing 11 14 Phaser 7750 Printer Service Manual Horizontal Transport Entrance Sensor and Top Tray Full Sensor 87700 325 2 1 Remove the horizontal transport top open and front cover see page 11 12 2 Remove the 2 screws securing the horizontal transport entrance upper cover see page 11 13 3 Remove the entrance sensor cover pry up on the locking tab while pressing firmly towards the entrance end of the transport 4 Disconnect the wiring harness connector 5 Press down on the two locking tabs located at the top of the sensor press up on the two locking tabs at the bottom of the sensor and remove the sensor Top Tray Sensor 1 Disconnect the wiring harness 2 Remove 1 screw and remove the sensor bracket and sensor Note When replacing the sensor be sure the harness guide is engaged into the cover 11 15 Gate In Solenoid Assembly 57700 375 1 Remove the Rear Cover 2 Disconnect the ground wire from the solenoid housing

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