HP Color LaserJet 9850 MFP Service Manual
Contents
1. 4 Replacing the transfer ground plate unit and the 2nd transfer roller L 3 108 10 5 Replacing the registration roller llli 3 109 10 6 Replacing the intermediate conveyance clutches 2 and 3 oooccoccccocooocoo oo 3 111 10 7 Replacing the ADU conveyance clutches 1 and 2 0 0000 eee eee 3 112 10 8 Replacing the ADU pre registration clutch llle 3 113 10 9 Replacing the decurler roller llli IIR 3 114 Z 2 lt z lt ES oa X W Z 2 For the complete PDF manual Ill DIS ASSEMBLY please visit www LaserPros com vi2. is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase separation between equipment and receiver Connect equipment to an outlet on a circuit different from that to which the receiver is located Consult your dealer or an experienced radio TV technician Any changes or modifications to the printer that are not expressly approved by HP could void the user s authority to operate this equipment Use of a shielded interface cable is required to comply with the Class A limits of Part 15 of FCC rules For more regulatory information see the hp 9085mfp user s guide Hewlett Packard shall not be liable for any direct indirect incidental consequential or other damage alleged in connection with the furnishing or use of this information Trademark Credits PostScript is a trademark of Adobe Systems Incorporated Windows is a U S registered trademark of Microsoft Corporation hp Color 9850mfp CONTENTS CONTENTS Aa s1 E worre O O AAA S 1 E DESCRIPTION ITEMS FOR DANGER WARNING AND CAUTION S 1 2 I V eususuusussuessssssssen n nRRRR RR IK c c ORGRRIe S 2 A OO ner eT nT eR tra ae renee ree S 10 IMPORTANT INFORMATION 2 00000 RR RR RR IRR RA A I Ac crc cc4cll S 10 onci CCU SA S 11 q INDICATION OF WARNING ON THE ENGINE eesnes RR III S 13 3 T OUTLINE E 1 PRODUCT INFORMAT
3. 4 8 2 Registration drive loop drive 0000 tee ee 1 35 4 8 3 ADU conveyance drive 0 0 ee he 1 36 4 8 4 Reverse paper exit drive 0 0c eet eens 1 37 4 9 Engine paper exit drive 0 cece eee 1 38 4 10 Scanner drive 0 0 en hh rn 1 39 5 IMAGE CREATION PROCESS ooo 1 40 5 1 Image creation flow and function 0 0000 tee eee 1 40 5 2 Charging process Step 1 0 00 c cece eee eee 1 41 5 3 Laser exposure process Step 2 02 00 teen eee 1 41 CONTENTS hp Color 9850mfp 5 4 Developing process Step 3 0 o oooooooooo es 1 42 5 5 1sttransfer process Step 4 oooooococo en 1 43 gt 5 6 2nd transfer process Step 5 1 6 aaaea 1 44 B 5 7 Separation process Step 6 o oooooooooo eee eee 1 44 S 5 8 Drum cleaning Sub Step 1 00 00 e cece RR lil 1 45 5 9 Pre charging exposure Sub step 2 0000 e eee teens 1 45 5 10 Transfer belt cleaning Sub step 3 2 000000 cece eee 1 46 5 11 2nd transfer roller L cleaning Sub step 4 2 00000 o 1 46 5 12 Toner collection Sub Step 5 0 20 0000 cent eee 1 47 e 5 13 Process ASUS ev esos dev eut revues 1 47 lt Il UNIT EXPLANATION x T1 SCANNER ih eu ar 3 Eu de eee ERE REA EUR eee eee yo ie ue EE E 2 1 2 1 1 Composition ob ego mre ihrer Rupe tte Qn a repere Goat i were Seal dee tete Paseo e 2 1 5 1 2 OPSLAUOMes cis d
4. ER BELT UNIT reto erre ia a a ae rele tues uate tus 2 30 5 1 SGOMPOSIION s aeara iat n do a ad dat ao UNS A 2 30 5 2 OperatloIt sonia aa aia aa Rosado have lated A a Rt d 2 32 5 2 1 Transfer belt pressure release mechanism 000 cee eee een 2 32 5 2 2 Image correction unit lille hr 2 33 5 2 3 sttransfer control ie xc O 2 34 5 24 2ndtransfer Control sosi icit s iai a kiinne hn 2 34 hp Color 9850mfp CONTENTS Os TONER SUPPLY i a sdnxenntut Bus ici a id A ind ida E AORT 2 35 6 1 COMPOSITION esini ui rr E A oy ew dada way dees at 2 35 6 2 Operation xs ii ha satan A A O A A ic UB a a 2 36 6 2 1 Toner supply control to the toner hopper section llli 2 36 6 2 2 Toner supply control to the developing unit llli eee 2 36 6 2 3 Copy print operation stop control due to no toner ooocccccccc ee 2 37 T TONER COLLECTION inacci n dac Dc scd eE ars pof dus 2 38 Lidl COMPOSIMION ERCLTEURSESIO TUTORIS 2 38 7 2 Operation eese er e Reus deu Pe tedulGadid eaaa iao a a pi RE 2 39 7 2 1 Toner collection control oooccoccccoooco e eee eee 2 39 7 2 2 Waste toner full detection control llle 2 39 9 PAPER FEED TRAY 1 TO 2 e gteactiey reme EN eaput A UR E Rua e Dor ams 2 40 8 1 Composition sa ho see mn eh Re sa a ar ara a ee Re e garia cec innere pem cm e toe Re Aish 2 40 8 2 O A C rper 2 42 8 21 Paper feed Control z xeu i RR ands aod Eo ed BEERE NE SE ald RON
5. For the complete PDF manual please visit www LaserPros com hp Color 9850mfp Copyright and License O 2004 Copyright Hewlett Packard Development Company L P Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws The information contained herein is subject to change without notice The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services Nothing herein should be construed as constituting an additional warranty HP shall not be liable for technical or editorial errors or omissions contained herein Part number Q3225 90935 Edition 1 03 2004 FCC Regulations This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy If this equipment is not installed and used in accordance with the instructions it may cause harmful interference to radio communications 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
6. ION occ 1 1 2 1 1 Product features x nose xl cte on tne gne E dre ai ves wise Sos ca WR de 1 1 1 2 Product specifications eiee siensa eiie e ae Eee Ee eee eee 1 2 1S IPNOGUCHOVEIVIOW inc a le passt i mead aan ibi atts ea E dd 1 4 gt 1 4 Space requirements lh 1 6 a UE SS 1 8 1 6 M dia specificatioris scc eek aia Sewanee OM gen RR ee bead See Peek eed 1 9 2 1 7 Media assessment tools and suppliers llle 1 19 a 1 8 Functions gx ahs Aye oo ac 1 20 NE 1 9 Maintenance and life 2 4 oa cu da wd aaeeea ca 1 21 x 2 CENTER CROSS SECTION 20 22 cece nee eee eee I RR pn 1 22 3 PAPER PATH 4 sour rhe e EVER hu end Y E ne qnd dox E ce ERO dl di Robur RR RUE Y n 1 23 4 DRIVE SYSTEM DIAGRAM sion RR qna ERR URPmeRzeAWE RN Eqacaepr es eee ee da 1 25 4 1 DUn drive csset mat xxt Sog e mn dE Ro BC DR eu UR RU 1 25 4 2 Transfer belt conveyance pressure drive oooooooooooooeo eese 1 26 4 3 Developing drive o oocoooconconr lh n 1 27 44 Toner supply drive o 1 28 4 5 Toner collection drive 0 0 eR re 1 29 4 6 Fixing dive jea iaee se ee RD eere Reg vH acE Ue E d Pope epe ewig eee d 1 30 4 7 Paperfeed drive isse asses ee ee A GS ce AR awe PR es ee a 1 31 4 7 1 Paper feed tray 1 to 3 drive o ooooooccoorocrnr ee 1 31 4 7 2 Vertical conveyance drive 2 cette eee eee 1 33 AB AQU ANWVE PT 1 34 4 8 1 By pass tray drive 20 cee eee 1 34
7. eed ae oe Rc 2 42 8 2 2 Up down plate control 0 2 auna RR e 2 43 8 2 3 Remaining paper detection control llli 2 44 8 2 4 Paper size detection control llle 2 45 9 BY PASS FEED sucia dar Eie ntum uacuum p Vogue t aree A ip a eae acis 2 46 971 Oed lt a e a ane Gia S a aus ws 2 46 9 23 OI TCCIEERTCRENERRREU ESRIERS TUORUM 2 47 9 2 4 Tray up drive control s silos REIR RR da Ex HOSP CET Y 2 47 9 2 2 Paper feed control o setce anan ana e ee ee y yw oy y Ro hm oy RR vn 2 47 9 2 3 Paper size detection control llli 2 47 10 VERTICAL CONVEYANCE coco 2 48 10 1 COMPOSITION ec i ocio iria rn meet do nece ec oe oed esp doe erred de 2 48 10 2 O peral orion PE 2 48 10 2 1 Vertical conveyance CONtTO oooocccoccco teeta 2 48 11 REGISTRATION ADU REVERSE PAPER EXIT 2000 00 ne 2 49 11 1 COMPOSITION eae 2 ooo A a wu eve eee o a qud eps 2 49 11 2 Operation ces cack 28 trae icis Amtes aeuec ADR UE S DS eU nea ita teer 2 53 11 2 1 Switching control of the paper exit ADU conveyance path 2 53 11 2 2 Reverse exit control ooooococoocoroo le 2 57 11 23 ADU conveyance control ooooccooocco n 2 58 11 2 4 Paper reverse control liliis hh 2 59 11 2 5 ADU pre registration CONtTOl o o ooooooooooo e 2 60 11 2 6 Registration control o o oooococccooooc e 2 62 11 27 2nd transfer Control ixi Es aclara a DR RUE lancia aS Ske 2 63 11 2 8 Pap
8. er exit full detection control o ooocoooocconocoon eee 2 63 12 FIXING UNIT Cosas da AAA EA E RA We 2 64 22 4 COMPOSIION atados drid o s rta M due EY d 2 64 12 2 Oper ir ii rei terme ed uper ear aes 2 66 12 2 1 Fixing drive CONTO 2 66 12 2 2 Pressure release control ooocooocoooo oo 2 67 122 3 Web Ccohlrol i diet E neuer Gt esu bus dn Sx eue RUE NE Pen equi Nub re 2 68 12 24 Temperature control 0 0000 nent eee 2 68 OUTLINE zZ O E lt z lt ES oa X W E Zz 2 Ill DIS ASSEMBLY CONTENTS hp Color 9850mfp IS INTERFACES tonta add E ale Ex CEA dE inte anta dedos don OS 2 69 13 1 COMPOSITION iiu sr ic a ak a Ge ra eee we 2 69 5 14 IMAGE STABILIZATION CONTROL ooo 2 70 B 14 1 Toner density control ci uel mero en Roe nomcn Ren ale tc E i RC 2 70 S Rs A te Deep bec ted s ceu DLL RIP UE 2 70 14 3 Charging potential control 0 0 eee 2 71 14 3 1 Correction of the reference value 2 71 14 3 2 Low humidity environment correction llle 2 71 14 4 Dot diameter adjustment control 0 0 ee 2 72 14 5 Gamma correction control ooocococcc hr 2 73 E 15 OTHER CONTROLS o occcoocco llle ses Im rn 2 74 4 15 1 Parts to which power is supplied even when the reset switch is turned Off 2 74 o 15 2 Parts that operate only when the power switch is turned on 00 02 e eee 2 75 E 15 2 1 Parts that operate when the reset switc
9. h is turnedon 00 0 ee ee ee eee 2 75 Z 15 2 2 Parts that operate when the main switch is turned on n saasaa anaana annan 2 75 ES Tete GE ee os coe a ee EE ee D te a EE 2 76 15 3 1 FaniCOMpPOSON sio voor ye eo eee riy eee ee PL Med E pue EE 2 76 15 4 Operation board control 2 2 6 ett 2 77 gt 15 4 1 Operation board composition 0 000 es 2 77 g 15 5 Counter control rires A A A ain ee d 2 78 i 15 5 1 Counter composition aaeeea len 2 78 lt 15 5 2 Counter operation sh sca recan na naia ee eee eee 2 78 2 15 6 ACS METTE TREE S 2 80 15 6 1 Switching between the color mode and the black and white mode 2 80 15 6 2 Copy count when using ACS 0 occoccccc ren 2 80 Ill DISASSEMBLY ASSEMBLY le e izieq Lc UT 3 1 1 4 Replacing the dust filter 2 lllllllllleeeeleeeel men 3 1 1 2 Replacing the dust filter 1 and the ozone filter 1 llli 3 3 1 3 Replacing the toner collection box liiis III 3 5 1 4 Angle adjustment of the operation board 1 1 2 0 0 2 enn 3 7 1 5 Removing and reinstalling the main board unit oocccccccccocooocr ee 3 8 2 SCANNER I 3 12 2 1 Screws that must not be removed 3 12 2 2 Removing and reinstalling the scanner glass 00 c ee eee 3 13 2 3 Removing and reinstalling the CCD unit llle 3 14 2 4 Removing and reinstalling the exposure unit llle leise 3 16 2 5 Remo
10. i ita as dera dif E one 2 2 1 2 1 Home position search in the exposure unit llle 2 2 1 2 2 Shading correction readinQ oooooooorrr ee 2 3 1 23 Original reading mode ocoocccc hr 2 4 E 1 2 4 Original reading control o oooooooooo eh 2 5 1 2 5 APS control sees ec ee bee bine Beene etes 2 8 D 1 2 6 FE CODBBopearoua tercer rdg cido aded tus ds ahis rata ra sedis stt 2 10 lt 1 2 7 lmageproc ssing sisse a a ek ERREUR AA ROR A A WBA E pa subi gus 2 10 A 2 WRITE 000 Pia a E eo ea iguala gor 2 12 23 COMPOSIMOH sce 2c ence siae drid pardas rige Rer 2 12 22 OPGFallOM aia ce A A 2s SEA a Headed 4 2 14 2 41 Image writing e bi RI e di ib are a add Pues 2 14 2 2 2 Color registration correction control 0 0000 cc eee eee eee 2 14 3 DRUM UNIT 5 icut ceu Bue a ees Ramada and bhutan ROTE ai 2 21 3 1 COMPOSIION urs I ea ari Mh SEE d bahia don 2 21 3 2 Operation ee ee ee ri ai 2 25 3 2 1 Image formation timing 0 eee 2 25 4 DEVELOPING UNIT ooo 2 26 4 1 COMPOSILON ae ueri rum RI o aun I Rp urea ad dopo erae aped ee 2 26 A ERIT O 2 28 4 2 1 Flow ofdeveloper o o o o oo ll lh 2 28 4 22 Developing control o oooocccooc eee 2 28 4 2 3 Toner supply control to the developing unit llle 2 28 4 24 Developing bias control o o oooooooooooo n 2 29 4 2 5 Durability of the developer lllssieeeeee III 2 29 5 TRANSF
11. ing temperature sensor 1 and the thermostat 1 9 8 Replacing the fixing temperature sensor 4 and removing and reinstalling the fixing temperature sensor 2 and the thermostatL 9 9 Replacing the fixing drive gear lille 9 10 Replacing the fixing cleaning unit llli Cleaning replacing removing and reinstalling the charging wire assy the charging grid plate ocooccoccccccooo IA Pulling out the process unit l l Removing and reinstalling the transfer belt Unit o o oooooo Replacing the belt cleaning brush unit 00000 e eee Replacing the belt cleaning blade 0 oooooooooooo eee Replacing the toner collection sheet 1 0000 ee eee nooo Replacing the belt separation claw oooooooooooooo eee eee eee Replacing the transfer belt 0 0 0 0 cece eee Replacing the 1st transfer roller 0000 00 cece ee ee eee eee Replacing the 2nd transfer roller U 000 000 cee eee eee Replacing the drum cartridge 0 cece eee Removing and reinstalling the drum 000 0c cece eee Replacing the developing unit 0 00 ce eee eee eee Replacing the developer 0 000 e eee eee eee ee Replacing the belt separation claw solenoid 000 eee ee eee Removing and reinstalling the process unit 0000 eee eeee Rem
12. oving and reinstalling the image correction unit 5 TONER SUPPLY Opening and closing the toner supply section 00000 eee eee Replacing the charging dust filter o o oooooooooooooooooo 6 PAPER FEED TRAYS 1 to 3 Removing and reinstalling the paper feed unit 2005 Removing and reinstalling the paper feed trays 1t0 3 o o ooo Replacing the paper feed roller and the feed rubber Replacing the double feed prevention rubber o oooooooooooooooo Replacing the paper feed clutch and the pre registration clutch Removing and reinstalling the tray up down wire 22 22005 7 BY PASS TRAY Replacing the paper feed roller and the feed roller Replacing the double feed prevention roller ooooooooooooo Replacing the paper feed clutch BP 0000 cece o 8 VERTICAL CONVEYANCE CONTENTS OUTLINE zZ O E lt z lt ES oa gt Lu zZ 2 Ill DIS ASSEMBLY CONTENTS hp Color 9850mfp 9 11 Replacing the fixing torque limiter llle BB 3 102 10 REGISTRATION ADU REVERSE PAPER EXIT ooocccccccc eee eee 3 104 5 10 1 Removing and reinstalling the ADU ooocccccccccoccocn BI 3 104 B 10 2 Replacing the registration cleaning sheet 3 106 S 10 3 Replacing the separation corona unit ooooccooccccooc es 3 107 10
13. ving and reinstalling the exposure lamp 0 00 cee eee eee eee ees 3 19 2 6 Removing the scanner Wie 3 20 2 7 Reinstalling the scanner Wir8 oooooccooocco eee 3 22 E A rr 3 25 3 1 Screw that must not be removed o cccoccccoo n 3 25 3 2 Removing and reinstalling the write unit llle 3 26 4 PROCESS UNIT zs orita ad crol Sara exc Ka is taa da 3 29 4 1 Flow of the disassembly of the process unit section 0 000 eee ee eee 3 29 4 2 Cleaning the charging corona unit 0 000 cc eee eee eee eee 3 30 hp Color 9850mfp 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 10 4 11 4 12 4 13 4 14 4 15 4 16 4 17 4 18 4 19 5 1 5 2 6 1 6 2 6 3 6 4 6 5 6 6 7 1 7 2 7 3 8 1 Removing and reinstalling the vertical CONVeyanCe ooooocococcoooo 8 2 Replacing the intermediate conveyance clutch 1 o o ooooccoooooooo ci ccc rv 9 1 Screws that must not be removed o ooooocccccoocococ eee eee 9 2 Removing and reinstalling the fixing UNit o ooooooooooooooooo 9 3 Replacing the fixing upper heater lamps 1 and 2 llslllessess 9 4 Replacing the fixing lower heater lamp 00000 e eee eee eeee 9 5 Replacing the fixing roller U ball bearing U and the heat insulating sleeve U 9 6 Replacing the fixing roller L ball bearing L and the heat insulating sleeve L 9 7 Replacing the fixing temperature sensor 3 and removing and reinstalling the fix
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