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Samsung - Printertec

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2. MN EN EN EN m a C61 01220C C61 00751A RAME M CASSETTE 24567 ML 4551NDR UIDE P REAR PAPER CST G2088 11 7 C61 01226C GUIDE M_REAR SA 2 SNA SNA Jl qu 11 8 GUIDE M LOCK A 11 9 C61 00414A SPRING ETC GUIDE PAPER 11 10 11 11 C64 00190C C61 01224B SNA SNA KNOB M_REAR Z4574 GUIDE M EXTENSION CST Z4574 Service SA service available SNA service not available c 1 f 1 1 1 1 3 11 11 GUIDE M_EXTENSION CST z454 1 11 12 BRACKET P EXTENTION 24575 1 11 13 JG61 70531A SPRING ETC LOCKER PLATE 50025 1 11 14 GEAR PINION 01127 1 1 1 1 1 2 LA ii 1 Y 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11 15 CAP M GUIDE SIDE L 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 SA SA SA SA A A A A A A A A A A A c SA SA SA 41 16 C61 01222A GUIDE P SIDE L 24571 11 17 C72 41210A PMO LOCKER PLATE L6038 11 18 C61 01227A GUIDE M PAPER SIZE 24579 11 19 97 02844 MEA UNIT HOLDER PAD 24424 11 20 C61 70911A SPRING ETC EXIT ROLL FD 01053 11 21 s s s s SNA s s s s lt 1 SA
3. Check and Cause Solution Digital Pginter 1 Deformed Doctor blade or cleaning blade 1 If causes 1 and 2 occur in the print Digital Pinter ae I in print cartridge cartridge replace the print cartridge and Digital Pllinter try to print out Digital Digital 2 Scratched surface of the charge roller 2 Replace the transfer roller if occurred as the print cartridge No 3 3 Partly depression or deformation on the surface of the transfer roller 6 2 2 Vertical White Line L Description White vertical voids in the image Check and Cause Solution Digital Printer Digital Printer 1 Foreign matter stuck onto the window of 1 Foreign matter stuck onto the window Bad internal lenses of LSU mirror Clean the LSU window with recommend Digita Printer ed cleaner IPA Clean the window with a Digital Printer clean cotton swab Digital Printer 2 Foreign matter or toner particles between 2 Replace the print cartridge the print cartridge roller and blade In case the life of the print cartridge has been expired white lines or light image occur in front of the image 3 It may occur when Burr and foreign 3 No 3 Remove the foreign matter and substances are on the window of the burr of the exposure window print cartridge frame print cartridge 4 If the fuser is defective voids occur 4 No 4 Open the front cover and
4. Check and Cause Solution 1 Bad ground contacts in OPC and or print 1 Remove contamination of the terminals of cartridge the print cartridge 2 Abnormal solenoid 2 Perform the engine self test using EDC Mode to check if the Solenoid is normal 3 If not solved by the above directions 1 2 Replace the engine board 4 Turn the power off delete the data of PC and try printing again KI Service Manual Samsung Electronics Troubleshooting 6 3 The cause and solution of the bad discharge 6 3 1 Wrong Print Position t Description Printing begins at wrong position on the paper J Check and Cause Solution Wrong sense time caused by defective feed sensor Replace the defective actuator actuator 6 3 2 JAM 0 Description 1 Paper is not exited from the cassette p 2 Jam 0 occurs if the paper feeds into the printer Check and Cause Solution 1 Check the Main clutch by using EDC 1 Replace the Main clutch Mode 2 Check if the pad is loose due to bad 2 Replace the side pad Assembly L or sealing of the side pad R if necessary 3 Check the surface of the roller pick up for foreign matter 3 Clean with soft cloth dampened with IPA Isopropyl Alcohol or water 4 If continuous clusters occur check 4 Replace the Main PBA and or Sensor whether the assembly slot between shaft pickup and housing pickup opens or is broken away 5 If
5. Check and Cause Solution Digital Printer Digital Print er 1 If dark or blurry black spots occur periodi Big cally the rollers in the print cartridge may Digital Printer be contaminated with foreign matte or Digital Printer paper particles Digital Printer Charge roller 38 mm interval ee gat OPC drum 95 mm interval 2 If faded areas or voids occur in a black image at intervals of 95 mm or black spots occur elsewhere the OPC drum surface is damaged 3 If a black image is partially broken the transfer voltage is abnormal or the trans fer roller s life has expired 1 Run OPC cleaning Mode Self test 2 or 3 times 2 In case of 95 mm interval Print and run the unremovable in 1 cleanly remove foreign substances stuck on the OPC location equivalent to black spots and white spots with a dry duster 3 The transfer roller guarantees 150 000 sheets printing in normal environment If the roller s life is expired replace it 4 In case of 38 mm interval unremovable in 1 take measures as to replace the print cartridge and try to print out 5 Clean the inside of the set against the paper particles and foreign matter in order not to cause the trouble Samsung Electronics Service Manual LJ Troubleshooting 6 2 5 Light Image L Description The printed image is light with no ghost Check and Cause Solution 1 Develop rol
6. FRONT INNER H1291 JC97 02232B UNIT COVER REAR E4063 2 2 n gt 3 o lt D o L 4551NDR N N D gt JC97 02232C UNIT COVER REAR E4063 ML 4551NDR 2 6 1 JC63 00703B COVER M REAR H1293 2 6 1 JC63 00703C REAR H1293 SA SA SA ML 4551NDR 26 2 SA 2 62 2 6 3 JC70 00007A ICT BRKT REAR COVER 24436 n gt ML 4551NDR SA SA SA SA SA SA SA ML 4550 ML 4550R SNA 2 1 13 JC64 00194A WINDOW M LCD K4285 264 2 6 5 2 6 6 2 6 7 2 6 8 2 6 9 o 2 S S S S S S S S S S S ES EEENIESNES n gt JC97 02389B UNIT COVER DUMMY 24420 2 1 14 JC63 00836A GROUND P TOP COVER G0440 2 7 2 7 2 7 1 SPONGE COVER DUMMY 212 27 2 7 2 2 8 2 8 JC63 006906C COVER M FRAMEEXT T1290 1 SA ML 4551NDR n z gt ML 4550 ML 4550 ML 4551NR ML 4550R 4551NR 1 L L 1 L 1 1 1 2 2 2 L 1 L 1 1 2112 JC64 00047A KEY MSAVEMODE kos 1 SA 1 1 1 o1 L 1 L L EE 1 1 1 1 L 2 2 L 5 1 1 1 S
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8. Main Drive 5 When separating the Main Motor Ass y disconnect the Connector from the Main Motor Ass y remove four screws and then remove the Main Motor Ass y Notice Make sure the Power Switch is turned off before disassembling the Motor Connector 3 Remove the Feed1 Gear as shown below di Main Motor Ass y Feed1 Gear Service Manual Samsung Electronics Disassembly and Reassembly 5 10 DEVE Drive Ass y 1 Before you remove the DEVE Drive Ass y you should 4 When separating the DEVE Motor Ass y disconnect remove Cover Right Refer to the 5 7 the Connector from the DEVE Motor Ass y remove three screws and then remove the DEVE Motor 2 Unplug the Connector from the DEVE Motor Ass y as Ass y shown below Notice Make sure the Power Switch is turned off before disassembling the Motor Connector 3 Remove four screws and take out the DEVE Drive Ass y L DEVE Drive Ass y EJ Service Manual Samsung Electronics Disassembly and Reassembly 5 11 Connector PBA 1 Before you remove the Connector PBA you should 3 The Connectors are located as shown below remove
9. Service Manual Samsung Electronics Alignment amp Adjustments 4 5 Error Messages Messages appear on the Smart Panel program window or the control panel display to indicate the printer s status or errors Refer to the tables below to understand the messages meaning and correct the problem if necessary Messages and their meanings are listed in alphabetical order Message Meaning Suggested solutions ADC Not Confirm Error There is a problem in your printer system Unplug the power cord and plug it back in If the problem persists please call for ser vice Door Open The top cover or rear cover is not securely Close the cover until it locks into place latched Duplex Jam 0 Paper has jammed during duplex printing Clear the jam Check Inside Duplex Jam 1 Paper has jammed during duplex printing Clear the jam Open Close Door Fuser Door Open The fuser door is not securely latched Open the rear cover and close the fuser door until it locks into place Fuser is Cleaning Your printer is printing a leaning sheet now Please wait a few minutes Inner Temp Open There is a problem in your printer system Unplug the power cord and plug it back in Cycle Power If the problem persists please call for service Inner Temp Short There is a problem in your printer system Unplug the power cord and plug it back in Cycle Power If the problem persists please call for service
10. RJ 74 28 JC6301133A SHIELD SMPS 2 31 SN Service Manual 7 3 Samsung Electronics Exploded Views amp Parts List Service SA service available SNA service not available Drawer SEC Code Ce Replacement ___ CBF POWER CORD UU 1 Replacement BOX MAIN JC96 03412C ELA UNIT DUPLEX Z6089 Service Manual 7 4 Samsung Electronics Exploded Views amp Parts List 7 2 Cover Assembly 7 ML 4551ND 7 5 Service Manual Samsung Electronics Exploded Views amp Parts List Service SA service available SNA service Drawer SEC Code Location QTY Service SNA 2 2 2 2 2 5 ML 4550 ML 4551ND ML 4551NDR ML 4550R 4551NR ML 4550 SA SA ML 4550 SA SA 2 0 JC96 04064A ELA HOU BASE HOUSING 24399 5 2 0 JC96 04064B ELA HOU BASE HOUSING 24399 AS JC96 04064E ELA HOU BASE HOUSING 24399 N N JC96 04064C ELA HOU BASE HOUSING Z4399 JC96 03978A ELA UNIT COVER Z6090 JC96 03978B ELA UNIT COVER TOP 26090 x JC96 03978C__ ELA UNIT COVER 26090 ML 4551ND ML 4551NDR SA ML 4551NR SA ML 4550R SNA SNA ML 4551NDR SA SA ML 4551NDR SA 2 1 2 1 2 1 2 1
11. 5 After rebooting the computer check for viruses restore the damaged files and reinstall the program to do the printing job 6 Add up enough memory to the PC In the spool manager the installed drivers and the list of the documents waiting to be printed are shown Select the document to be deleted and check the delete menu If you intend to delete the current document being printed the data being transferred to the printer will be put out and then the document is removed Before choosing the document the menu is still inactive Or put the document out of the list and repeat the routine as in the above or finish the spool manager CI Service Manual Samsung Electronics Troubleshooting 6 Troubleshooting 6 1 Procedure of Checking the Symptoms Before attempting to repair the printer first obtain a detailed description of the problem from the customer Power On No Power OP Panel No Power Module error ON Main PBA error LCD Panel error Yes Ready or No Indicate Yes Refer to Power save a Error Massage Error Massage lt Chapter 4 5 gt Yes No Y Y rintin NATIN c Refer to Solution Nomal of Image Problem Yes END Service Manual KI Samsung Electronics Troubleshooting 6 2 The cause and solution of Bad image 6 2 1 Vertical Black Line and Band Description 1 Straight thin black vertical line occurs in the printing p 2 Dark black vertical band occur in the printing
12. Item Code Quantity INA ACCESSORY JC99 01974E 1 CBF POWER CORD 3903 000042 1 BAG PE 6902 000288 1 S W APPLICATION CD JC46 00280A 1 S W APPLICATION CD JC46 00293A 1 MANUAL CARD WARRANTY CARD JC68 00690A 1 MANUAL NETWORK GUIDE JC68 01579A 1 LABEL P BLANK 90 25 JC68 01584A 1 Service Manual 27 Samsung Electronics N _ Summary of Product g Summary of Product This chapter describes the functions and operating principal of the main component 3 1 Printer Components 3 1 1 Front View AY SSO KAN NN N d lt Z 1 6 lo lo 2 SIL 2 lt 1 output tray 8 handle 2 control panel 9 paper level indicator 3 control board cover 10 multi purpose tray top cover The figure above shows an ML 4551ND with all available options 5 optional tray 2 12 multi purpose tray paper width guides 6 optional tray 3 13 multi purpose tray extension 7 Optional tray 4 Service Manual ES Samsung Electronics Summary of Product 3 1 2 Rear View The figure above shows an ML 4551ND with all available options 1 power switch 5 parallel port 2 rear cover 6 USB port 3 duplex unit 7 network port 4 power receptacle 3 2 Service Manual Samsung Electronics Summary of Product 3 1 3 Control Panel The control panel on the top right side of your printer has the display and the
13. SA SA SA C61 01228A 11 22 61 01724 GUIDE PAPER L 11 23 C64 00268A SHUTTER PATH L f 11 24 SPRING ETC PLATE K UP 11 25 UP 11 26 JC73 00141A RPR PAD CASSETTE 11 27 GUIDE M_HANDLE 11 27 GUIDE M_HANDLE 11 28 C68 01552A LABEL R CASSETTE L f 11 30 SPRING ETC CLAW 11 32 JC63 01206A GROUND CASSETTE 26101 HOLDER M PAD_HOUSING Z4576 Kasi SA sS Service Manual 7 27 Samsung Electronics Block diagram Block Diagram 8 8 1 System Block Diagram MOSNAS Tins ino x SdiNS NIVIA NAHI 0 1981102 43NO1 YOSNGS X31400 d MU IM SdAH SdINS D MS YIMOd 3 131N AOI OY los LOIN AAG LOW NIYN ns JAve M S 83 02 YISNI d6 SAve MIS YINOD vag SOLON NIVIN way uondo 3ynejeg oc asn 78219991 YOLOW 102000 euiBu3 coed 78cld ELYN 2 39d4H zx 0991 x 8ZLA162dS YON 7HNWZL wi8kuo M
14. As N x n gt JC96 03978U ELA UNIT COVER 26090 JC96 03978W ELA UNIT COVER 26090 JC96 03978Q ELA UNIT COVER 26090 N 214 214 244 212 FAFA gt gt 2 1 2 JC63 01101B OPEN 24430 2 1 3 JC72 01367B 5 RX L6055 D gt 2 1 3 ML 4551NDR 214 SA 2 1 4 SA ML 4551NDR 215 SA 2 1 6 SA SA 2 1 6 JC63 01445C PANEL Z6100 D gt 2 1 JC63 01445A PANEL 26100 2 1 6 JC63 01100W PANEL 26100 SA ML 4551NR ML 4550R PAT 2 1 8 5 219 SA SA 2440 JC64 00265A KEY M BUTTON 24434 o 2 M 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 i 2110 NI ASSINDR 21 11 z 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 JC63 00684B LEFT H1292 Dl N ML 4551NDR D gt SA JC63 00701B RIGHT H1294 JC63 00701C RIGHT H1294 JC63 00702B CONTROL BOX H1288 H SA ML 4551NDR SA JC63 00702C COVER M CONTROL BOX H1288 n gt 2 3 2 3 2 4 2 4 ML 4551NDR 5 5 i JC63 00684C COVER M_LEFT H1292 JC63 00685B FRONT INNER H1291 JC63 00685C
15. Service Manual Samsung Electronics Disassembly and Reassembly 5 7 Cover Right 1 Pull the Cassette out of the printer 3 Remove two screws and take out the right side as shown below Service Manual Samsung Electronics Disassembly and Reassembly 5 8 Main PBA 1 Before you remove the Main PBA you should remove Cover Right Refer to the 5 7 2 Unplug the all Connectors as shown below 3 The Connectors are located as shown below DPX SOL Thermistor Key Panel Cover Open LSU Toner Sensor E EE EE O Key Panel DEVE Motor PTL SMPS HVPS Ji Network PBA Card HDD Optional Duplex USB Port e Exit Sensor F1 P1284 Port Main Motor Connector PBA O O Connector Memory Optional SCF Service Manual 4 Remove two screws and take out the Dummy Bracket 1 BRACKET NIC HOLE Samsung Electronics Disassembly and Reassembly 5 9 Main Drive Ass y 1 Before you remove the Main Drive Ass y you should 4 Remove five screws and take out the Main Drive remove Ass y Cover Right Refer to the 5 7 2 Unplug the Connector from the Main Motor Ass y as shown below
16. Toner Low Replace Toner The toner in the cartridge has run out Install a new genuine toner cartridge You can keep printing but the quality cannot be guaranteed and the product support is no longer provided You can configure not to see the Toner Low Replace Toner message Replace Toner The toner cartridge installed is not a genuine cartridge This message appears when you turned off the Toner Low Replace Toner message Install a new genuine toner cartridge You can keep printing but the quality cannot be guaranteed and the product support is no longer provided Toner Exhausted Stop p The lifespan of the toner cartridge is reached You can select either Stop or Continue If you do not select any the printer will work as Stop is selected If you select Stop you cannot print until the genuine cartridge is installed If you select Continue you can keep printing but the quality cannot be guaranteed and the product support is no longer provided If you want to change the selection turn the printer off and on to have this message appear again and then re select Stop or Continue Toner Exhausted Replace Toner1 The lifespan of the toner cartridge is reached This message appears when you selected Stop at the Toner Exhausted prompt Install the genuine toner cartridge Toner Exhausted Replace Toner The lifespan of the toner cartridge is reached This message appears when you selecte
17. 3 Thoroughly shake the cartridge 5 or 6 times to distrib ute the toner evenly inside the cartridge Note If toner gets on your clothing wipe it off with a dry cloth and wash clothing in cold water Hot water sets toner into fabric Samsung Electronics 4 Hold the toner cartridge by the handle and slowly insert the cartridge into the opening in the printer Tabs on the sides of the cartridge and corresponding grooves within the printer will guide the cartridge into the correct position until it locks into place completely 5 Close the top cover Make sure that the cover is securely closed Service Manual Troubleshooting 6 5 3 Replacing the toner cartridge When the toner cartridge is completely empty Replace Toner appears on the display Smart Panel program window appears on the computer telling you that the toner cartridge is empty Status LED lights red At this stage the toner cartridge needs to be replaced For order information for toner cartridges Note This feature does not work for the Toner Empty message 1 Open the top cover 4 Locate the sealing tape at the end of the toner cartridge Carefully pull the tape completely out of the 2 Pull the toner cartridge out cartridge and discard it Note sealing tape should be longer than 60 cm when correctly removed Holding the toner cartridge pull the sealing tape strai
18. Component Test 6 Fuser Ctrl message on the panel 2 Press the OK Key when it is found 3 Press the Arrow keys until finding a suitable function Refer to the table below 4 Press the OK Key when it is found 5 Press the OK Key for execution or the Back key for retun Function Function Name Description Display LCD Remarks Fuser Bias The bias will have the saved value previously Fuser Bias ON OFF Temp Control The fuser unit will control the power for fixing and Temp Control xxx is a display the current temperature on the panel OFF ON xxx current The target temperature is 160 C temperature Fuser Temp The ADC will be displayed on the panel Fuser Temp xxx xxx is it s ADC Inner Temp The ADC will be displayed on the panel Inner Temp xxx xxx is it s ADC The procedure and content above can be changed according to the situation 4 1 9 LSU These functions are to check a current state normal or not of the Laser Scanning Unit Usage 1 Press the Arrow Keys 4 until finding Component Test 7 LSU Control message on the panel 2 Press the OK Key when it is found 3 Press the arrow keys until finding a suitable function Refer to the table below 4 Press the OK Key when it is found 5 Press the OK Key for execution or the Cancel key for stop Service Manual 4 7 Samsung Elec
19. DIGITAL LASER PRINT ML 4550 Series ML 4550 ML 4551N ML 4551ND ML 4551NR ML 4551NDR Basic Model ML 4550 SER VIC Manual sg CONTENTS The keynote of Product DIGITAL LASER PRINT Series Model ML 4550 4551N 4551ND High speed Laser Printer Up to 43 ppm in A4 45 ppm in Letter Duplex 29 ipm A4 30 ipm Letter Resolution Up to 1200 x 1200 dpi Marvell 500Mhz Memory 128 MB Max 512 MB 128 or 256 MB optional memory available Use only the Samsung approved DIMM 128 MB ML MEM150 256 MB ML MEM160 Option ML 4550 500 sheet trays ethernet 10 100 Base TX wired LAN ethernet 10 100 Base hard disk duplex unit DIMM Toner cartridge Starter 10K or 20K pages Consumable 10K or 20K pages Duty cycle Monthly Up to 150 000 pages Contents 1 Precautions 1 1 Safety Warning IR BB Qa Acts a Bd a QU QE BALAG 1 1 1 2 Caution for safety 1 2 1 2 1 Toxdcmateral 1 2 1 2 2 Electric Shock and Fire Safety Precautions s s s sso 1 2 123 Handling Precautions 1 3 1 24 Assembly Disassembly Precautions 1 3 1 2 5 Disregarding this waming may cause bodily injury 13 ESD Precautions lt lt s lt lt s sos s a lt 1 5 2 Product Specifications 21 Product Overview 2 1 22 Spedficat
20. Install Toner DA toner cartridge is not installed Install a toner cartridge amp View of when the inner terminal of the Check if there is any deformity at the set and the DEVE is not connected inner terminal of the set of check the properly CRUM at the DEVE for any polluted areas Invalid Toner The toner cartridge you have installed is Install a Samsung genuine toner not for your printer cartridge designed for your printer Load Size In Tray The paper size specified in the printer Load the correct paper in the tray properties does not match the paper you are loading Load Manual The multi purpose tray is empty in manual Load a sheet of print media and press OK Press Cont Key feed mode You need to press OK each page to be printed Low Heat Error There is a problem in the fuser unit Unplug the power cord and plug it back in Cycle Power If the problem persists please call for service Service Manual ng Samsung Electronics Alignment amp Adjustments Message Meaning Suggested solutions LSU Motor Error A problem has occurred in the LSU Unplug the power cord and plug it back in Cycle Power Laser Scanning Unit If the problem persists please call for service MP Tray There is no paper in the multi purpose tray Load paper in the multi purpose tray Paper Empty OPC is Cleaning Your printer is printing a cleaning sheet now Please wait a few minutes
21. The connection of the cable and printer port is not proper Check if the connection is properly done and if the parallel port in CMOS is rightly set up 3 As a printer port Select ECP or SPP among SPP Normal ECP and EPP modes increase print ing speed SPP normal mode support 8 bit data transfer while ECP Mode transfer the 12 bit data 4 f the regular font is not printing the cable or the printer driver may be defective Tum the PC and printer off and reboot the system to print again If not solved double click the printer in my computer If the regular fonts are not printed this time again the cable must be defective so replace the cable with new one Service Manual Samsung Electronics Troubleshooting 6 6 3 Abnormal Printing The printing is not working properly even when the cable has no problem even after the cable is replaced If the printer won t work at all or the strange fonts are repeated the printer driver may be defec tive or wrong setup in the CMOS Setup Description Check and Cause Solution 1 Set up the parallel port in the CMOS SETUP 1 Select SPP Normal or ECP LPT Port the among ECP EPP or SPP in the CMOS Setup 2 Printer Driver Error 2 Check the printer in My Computer to see if the printer driver is compatible to the present driver or delete the old driver if defective and reinstall the new driver 3 Error message from insufficient memory 3 Delete the unne
22. 3 59 2 G0471 3 59 21 L6039 3 59 2 2 24486 s s D O n z e 3 59 2 3 JC73 00223A_ IRUBBER PICK_UP C4025 3 59 3 JC61 01579A_ IHOLDER P REGI 24487 9 59 4 JC66 00911A _ SHAFT FEED1 C4028 S SNA S D e A A A A A A A A A A A A 3 505 K2860 36054 24488 2 59 52 C4022 2 596 24489 3 507 24487 3 598 01102 3509 Z4490 3 59 10 24491 3 60 Z4492 361 M0448 2 62 H1257 3 63 24493 364 Z4494 SNA s SNA n 2 2 3 50 7 JC66 00892A ROLLER M IDLE FEED2 24483 3 51 JC61 01250A STOPPER M KNOCK UP MP L H3074 3 52 JC61 01249A STOPPER M KNOCK UP H3075 n 1 z 9 50 6 6044 000231 R0006 A SA SA SNA SA 3 65 Z4495 3 66 P0032 3 67 G0331 3 68 24496 3 69 24497 3 71 1015 3 72 K4276 3 73 0411 3 76 0445 3 77 M0447 3 78 G0442 3 79 SNA 9 50 4 JC61 00652A BUSH M RETARD K2883 SNA SNA SA Q Qo NIM SA SNA o 2 2 Drawer Service Manual 7 10 Samsung Electronics Exploded Views amp Parts List Service SA service available SNA service not available Drawer Code 3 81 JC72 00317A PMO GUIDE DEVE L T2158 3 82 JC72 00318A PMO GUIDE DEVE R T2159 1 1 3 83 2 3 84 JC65 00008A TERMINAL P TR KESTREL 1 3 86 1 3 89 1 3 90 JC63 00676A SROUND P FUSER 1 4 4 1 1 1 1 1 1 1 Service 1 SA SA 2 SA 1 SA o1 L 3 91 JC6
23. 7 5 REGI Assembly 11 Continue 7 6 Main Motor Assembly 7 7 Deve Motor Assembly 7 8 Exit Sorenoid Assembly 7 9 Cassette Assembly 7 10 Duplex Unit 7 11 SCF Unit Block diagram 8 1 System Block Diagram Connection Diagram 9 1 Connection Diagram Schematic Diagram 10 1 Main Board 10 2 DIMM board 10 3 CRUM board 10 4 EMPTY board 10 5 HVPS 10 6 Panel 10 7 SCF 10 8 Toner sensor 10 9 HDD eps Reference Information 11 1 Troubleshooting Tools 11 2 Acronyms and Abbreviations 11 3 Select a location for the printer 11 4 Sample Tests Pattems Precautions 1 Precautions In order to prevent accidents and to prevent damage to the equipment please read the precautions listed below carefully before servicing the printer and follow them closely 1 1 Safety Warning 1 Only to be serviced by appropriately qualified service engineers High voltages and lasers inside this product are dangerous This printer should only be serviced by a suitably trained and qualified service engineer 2 Use only Samsung replacement parts There are no user serviceable parts inside the printer Do not make any unauthorized changes or additions to the printer these could cause the printer to malfunction and create electric shock or fire hazards 3 Laser Safety Statement The Printer is certified in the U S to conform to the requirements of DHHS 21 CFR chapter 1 Subchapter J for Class 1 1 laser products and elsewhere i
24. Failure to do so could cause the printer to tip or fall possibly causing personal injury or damaging the printer 5 Do not install the printer on a sloping or unstable surface After installation double check that the printer is stable 1 4 Service Manual Samsung Electronics Precautions 1 3 ESD Precautions Certain semiconductor devices can be easily damaged by static electricity Such components are commonly called Electrostatically Sensitive ES Devices or ESDs Examples of typical ESDs are integrated circuits some field effect transistors and semiconductor chip components The techniques outlined below should be followed to help reduce the incidence of component damage caused by static electricity Caution gt gt Be sure no power is applied to the chassis or circuit and observe all other safety precautions Immediately before handling a semiconductor component or semiconductor equipped assembly drain off any electrostatic charge on your body by touching a known earth ground Alternatively employ a commercially avail able wrist strap device which should be removed for your personal safety reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ESDs place the assembly on a conductive surface such as aluminum or copper foil or conductive foam to prevent electrostatic charge buildup in the vicinity of the assem bly 3 Use only a ground
25. Open Heat Error There is a problem in the fuser unit Unplug the power cord and plug it back in Cycle Power If the problem persists please call for service Out Bin Full The output tray is full It can hold up to 250 sheets of plain paper Once the paper is removed from the output tray the printer resumes printing Over Heat Error Cycle Power There is a problem in the fuser unit Unplug the power cord and plug it back in If the problem persists please call for service Paper Exit Jam 1 Paper has jammed before reaching Clear the jam Open Close Door to the exit sensor Paper Jam 0 Paper has jammed in the feeding area Clear the jam Open Close Door of the tray Paper Jam 1 Paper has jammed in the fuser area Clear the jam Open Close Door Paper Jam 2 Paper has jammed in the paper exit area Clear the jam Check Inside Paper Tray Jam Paper has jammed in the displayed Clear the jam Open Tray optional tray Printing The printer is printing jobs Complete your printing Ready The printer is on line and ready to print Use your printer Replace Toner This message appears between the Toner Empty status Replace the toner cartridge with a new one Self Diagnostic The LSU Laser Scanning Unit in your Please wait a few minutes LSU printer is checking some problems detected Self Diagnostic The engine in your printer is checking Please wait a few minutes Temperature so
26. 6 AS nS1 6 EXE anol 8 6 NO LOW NSI 9I gt 8 DOA 8 NET anol z zx z AQv3uu 6 ON Z 211 axlos 9 YOLOW d NST vl e9 N3dO H3AOO 9 6 123134 125 8 gt el snulw ON1SHu EL gt s ON S axy doS gt IL ZHSU 21 SAZ Y reel AldW3 3os Zk snid ON1ISHUu LL SAv2 EET reel 2 gt 6 5 01 te 2 2 gt Avz 0 6 gt Avz awen jeubig awen jeubig gt z snid LOGA 8 wey jeubis Uld jeubis Q8 Jos e 498 NO 8 snuu ZOdA 4 N3dOH3AO2 gt NIV N3dO YAO GL NO S snid LOGA 9 EN ano 9 61 vi aes TRES HUMAN 6 1noisuu 9 gt v AldW3 d l ui E d T3NVd v LL NIQ IHVOInOq Lawa ZL gt CAIM ii P T3NVd 21 I93H d LL ssa Bk ROS z gt 6 NTO Lava 01 ING 1 99 Slot Tins Nig1nO 6 BUENA SUP Sam ld jeubis owen jeubis SOW neel 8 NSTE NIYW NsD 9 NI JANVd 13Nvd p NO Service Manual Samsung Electronics Reference Information 11 Reference Information This chapter contains the tools list list of abbreviations used in this manual and a guide to the location space required when installing the printer A definition of tests pages and Wireless Network information definition is also includ
27. 9 1 pressure force left right 1 Replace both the left right Spring Digita springs of the transfer roller is not even Holder Digita the springs are damaged the transfer Digita roller is improperly installed or the trans Digita fer roller bushing or holder is damaged 2 The life of the print cartridge has expired 2 Occur in the print cartridge gently shake the print cartridge 3 The toner level is not even on the print 3 Replace the print cartridge and try to print cartridge roller due to the bad blade out 6 2 8 Background Description Light dark background appears whole area of the printing ae Check and Cause Solution Digital Printer Diqital Printer 1 Does character exist less than 2 1 The print cartridge is basically igi i coverage per a page and hasn t it designed to print 20 000 pages with Digital been used long time 5 coverage If it prints more than Digital Printer see the configuration sheet 23 000 pages with 296 coverage a Digital Printer background can occur 2 The A S is not guaranteed if using a 2 Is a recycled print cartridge be used recyled the print cartridger 3 Has the life span of the print cartridge ended 3 Replace the print cartridge when the life span of it has been ended 4 Is the movement Up and Down of the transfer roller smooth 4 Clean the bushing part of the transfer roller 5 Is the HVPS no
28. A4 standard Toner remaining amount detecting sensor Yes OPC Cleaning Cleaning blade type Management of disusable toner Collect the toner by using Cleaning Blade OPC Drum protecting Shutter Yes Classifying device for toner cartridge ID is classified by CRUM Cleaning Roller Ver 1500V f 3 0KHz Ner 4 _ p 200V St Vo 650V Vi 50V Supply Roller Max 5 0kV Transfer Roller Toner Cartridge Layout EJ Service Manual Samsung Electronics 3 3 Engine H W Specifications 3 3 1 ML 4550 PCL Main Board Summary of Product The Engine Board and the Controller Board are in one united board and it is consisted of CPU part and print part in func tional aspect The CPU is functioned as the bus control O O handling drivers and PC interface The main board sends the Current Image by Video data to the LSU and manages the conduct of Electrophotography for printing It is consisted of the circuits of the motor paper feed pass driving clutch driving pre transfer lamp driving current driving and fan driving The signals from the paper feed jam sensor and paper empty sensor are directly inputted to the main board pet ro ma lt ma ane Samsung Electronics Service Manual Summary of Product 3 3 1 1 Asic ORION 2 Marvell Feroceon 2850 ARM Compatoble I Cache 32KB D Cache 32KB 64 bit
29. Check and Cause Solution 1 Check the cover open circuit on the main board 1 Check the insertion of the cover open SW connect 2 Check the cover open board 2 Replace the main control board or cover open board Service Manual Samsung Electronics Troubleshooting 6 4 8 Defective motor operation Description Main motor is not driving when printing and paper does not feed into the printer resulting 0 Check and Cause Solution 1 The motor harness or motor PCB may be defective 2 Check the motor operation in the EDC mode 6 4 9 No Power 1 Replace the motor unit 2 Replace the main PBA Description When system power is turned on all lamps on the operator panel do not come on Check and Cause Solution 1 Check if the power input and SMPS output are normal 2 Check the inferiority of LED Panel or LDC window on the front cover if the OP panel does not appear after normal warming up 1 Replace the SMPS 2 Replace the control board EJ Service Manual Samsung Electronics 6 4 10 Vertical Line Getting Curved Troubleshooting e Description When printing vertical line gets curved Check and Cause Solution 1 If the supply of 24v is unstable in the main control board linking with LSU check drive by EDC mode LSU check 2 Chect the deve PBA in the print cartridge 1 Replace LSU 2 Replace the toner sensor PBA 2
30. DC Fan you should remove Cover Right Refer to the 5 7 Cover Left Refer to the 5 13 Cover Rear Refer to the 5 14 2 Unplug the two Connectors from the Toner Sensor PBA 3 Remove the screw for taking out the Stopper and then take out the DC Fan Service Manual EJ Samsung Electronics Disassembly and Reassembly 5 23 Toner Sensor PBA 1 Before you remove the LSU you should remove 4 Remove the screw securing the Cover Open PBA Top Cover Refer to the 5 15 and remove it Then unplug the Connector from the LSU Refer to the 5 21 Main PBA as shown below 2 Unplug the all Connectors from the Toner Sensor T N PBA Cover Open PBA Harness Cover Toner Sensor PBA 5 Remove three screws and take out the LSU Lower Cover 3 Remove two screws and take out the Toner Sensor PBA T Toner Sensor PBA HV Small Spring Ponang 7 m P dy gt Bag pA FA T 2 Y 4 h ES 0 Z gt gt 2 lt Z M YN ARS Service Manual Samsung Electronics Disassembly and Reassembly 5 24 REGI Ass y 1 Before you remove the REGI Ass y you should 4 Take out the REGI Ass y as shown b
31. Ds P lt D lt D lt ESESESESE SES E SE SE SESESESEEE SE SN S Sss w w w w w Co N Co D JC66 00883A ROLLER EXIT F DOWN D4089 JC72 01310A 7 PMO ACTUATOR OUTFULL K3819 D 3 13 G0200 3 14 22263 3 14 1 24451 3 14 2 53058 co co y gju c co gju c co o o co co 2 co co co co gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt gt PISS S P gt gt gt gt gt gt gt 9 14 3 JC70 00195A IPR BRACKET SENSOR S3055 3 15 JC39 00261A HARNESS SENSOR H1242 O gt 3 16 JC61 00675A GUIDE P REGI UPPER G2082 3 17 JC61 70918A 7 SPRING ETC LEVER L4097 D gt 3 9 JC66 00674A 217 60331 3 5 2 JC72 41007A PMO ROLLER FD P0048 3 19 JC61 00691A GUIDE PLATE PAPER G2091 3 21 0604 0010957 PHOTO INTERRUPTER P0013 n gt 9 20 JC70 00339A IPR P GROUND PLATE PAPER P5064 n gt 3 28 H1256 224 24452 3 25 K4277 3 26 H1249 227 24453 3 28 Z4454 3 29 Z4455 3 30 Z4456 331 Z4457 3 32 Z4458 2533 24459 3 34 Z4460 gt 3 12 JC61 01262A BUSH M EXIT D7 S4014 3 35 Z4461 3 36 Z4462 3 37 20016 3 38 K3053 3 39 F0003 3 40 L6040 n gt gt 3 43 P0032 347 Z4463 3474 Z4464 3472 Z4465 347 3 T2175 3474 M0443 n gt n gt a o o 8 lt 2 D AI R
32. LCD Remarks Before touching After touching T4 Paper Empty See the message after touching the sensor 4 Paper Empty T4 Paper Empty Empty Present T1 PSize0 Sen See the message after touching the sensor T1 Psize0 Sen Low T1 Psize0 Sen High T1 PSize1 Sen See the message after touching the sensor T1 Psize1 Sen Low T1 Psize1 Sen High T1 PSize2 Sen See the message after touching the sensor T1 Psize2 Sen Low T1 Psize2 Sen High T2 PSize0 Sen See the message after touching the sensor T2 Psize0 Sen Low T2 Psize0 Sen High T2 PSize1 Sen See the message after touching the sensor T2 Psize1 Sen Low T2 Psize1 Sen High T2 PSize2 Sen See the message after touching the sensor T2 Psize2 Sen Low T2 Psize2 Sen High T3 PSize0 Sen See the message after touching the sensor T3 Psize0 Sen Low T3 Psize0 Sen High T3 PSize1 Sen See the message after touching the sensor T3 Psize1 Sen Low T3 Psize1 Sen High T3 PSize2 Sen See the message after touching the sensor T3 Psize2 Sen Low T3 Psize2 Sen High T4 PSize0 Sen See the message after touching the sensor T4 Psize0 Sen Low T4 Psize0 Sen High T4 PSize1 Sen See the message after touching the sensor T4 Psize1 Sen Low T4 Psize1 Sen High T4 PSize2 Sen See the message aft
33. List Service SA service available SNA service not available Drawer Code 10 0 JC96 03412C ELA UNIT DUPLEX Z6089 10 0 JC96 03412E ELA UNIT DUPLEX Z6089 ML 4551NDR F G 10 1 10 2 10 3 aaa 10 3 10 4 JC61 01697A GUIDEM ALIGNNDPX fp 10 5 10 6 10 7 10 8 l 10 8 10 10 10 11 10 12 10 13 6107 001165_ SPRING TS 10 14 10 15 10 16 10 17 10 18 10 19 10 20 10 22 10 23 10 24 10 25 10 26 JK72 00058A_ PCT SILP WASHER O 10 27 10 28 10 29 10 30 10 21 JC66 00898A PULLEY M 30 DUMMY DUP Z4419 10 32 JC66 00901A ROLLER FEED D2145 10 33 6044 000107 RING C 24396 10 34 JC70 00457A ICT STUD PAPER GUIDE DP G2098 Drawer Service Manual 7 25 Samsung Electronics Exploded Views amp Parts List 7 11 SCF Unit a WSs SY NI N 5 N 2 VAN 3 NG KY SONA SA lt 7 26 Service Manual Samsung Electronics Exploded Views amp Parts List l Drawort SEC Code Descripion Location Service 11 0 SA sd 11 0 SA ML 4551NDR 11 1 SA 11 2 JC64 00189B INDICATOR M_EMPTY Z4569 11 3 JC61 01244A GUIDE P SIDE_R 24573 c Q a C 11 4 C61 01225C UIDE M SIDE LOCK L Z4567 11 5 61 01220 RAME M CASSETTE 24567 N pe
34. Monarch No 10 DL C5 C6 Media type Transparencies Envelopes Labels Card stock Media weight 16 43 Ib 60 to176g Sensing Paper empty sensor Standard Cassette Tray Capacity 500 sheets 759 m Media sizes A4 A5 Letter Legal Executive Folio Oficio ISO B5 JIS B5 Media types Plain Paper Media weight 16 28lb 60 to 105g Sensing Paper empty sensor Paper Size Sensor Second Optional Cassette Tray Capacity 500 sheets 0 759 m Media sizes A4 A5 Letter Legal Executive Folio Oficio ISO B5 JIS B5 Media types Plain Paper Media weight 16 28lb 60 to 105g Sensing Paper empty sensor Paper Size Sensor Third Optional Cassette Tray Capacity 500 sheets 0 759 m Media sizes A4 A5 Letter Legal Executive Folio Oficio ISO B5 JIS B5 Media types Plain Paper Media weight 16 28lb 60 to 105g m Sensing Paper empty sensor Paper Size Sensor Output Stacking Capacity Face Down 250 sheets 759 m Face Up 100 sheets 759 m Output Full sensing Paper full Sensor Optional Stacker Capacity Face Down N A Duplex Optional Built in Supporting Media sizes A4 Letter Legal Folio Oficio Media types Plain Paper Media weight 20 24lb 75 909 m Service Manual KI Samsung Electronics Specifications 2 2 4 Consumables ML 4550 SERIES ML 4550 ML 4551
35. PS printing Use the optional hard disk You can install an optional hard disk in your printer The 40 GB hard disk can store the data from your computer in the print queue This decreases the workload of the computer You can use various print features such as storing a job in the hard disk proofing a job and printing private docu ments You can manage the print jobs in the print queue of the printer hard disk For details Print in various environments You can print in Windows 98 Me NT 4 0 2000 XP 2003 Your printer is compatible with Linux and Macintosh Your printer comes with both Parallel and USB interfaces You can also use a network interface The ML 4551N and ML 4551ND come with a built in network interface 10 100 Base TX However you need to install the optional wired network interface card to the ML 4550 Printer Features The table below lists a general overview of features supported by your printer I Installed O Option Features ML 4550 ML 4551N ML 4551ND IEEE 1284 Parallel USB 2 0 Network Interface O Ethernet 10 100 Base TX Hard Disk O O O PostScript Emulation Duplex Unit O O Optional Tray 2 O O O Optional Tray 3 O O O Optional Tray 4 O O O 3 6 Service Manual Samsung Electronics Summary of Product 3 2 System Layout Cassette MPF G LSU SMPS amp HVPS Board Du
36. RISC embedded processor core Dual bus architecture for bus traffic distribution AMBA High performance Bus AHB System Bus with SDRAM 64 bit Mbus Crossbar extension Interface with Flash and Device port SDRAMC 32 Bits Dual mode DDR II 200MHz 4 Banks Up to 256MB per Bank Device Controller Boot Flash 1 Bank Up to 128MB Device NOR Flash 3 Banks Up to 128MB per Bank No Graphic Execution Unit and Image processor No Codec Encoding Decoding Printer Video Controller Interface for LBP engines Hyper C Printer Video Controller with RET algorithm Line Memory amp Lookup Table Memory 512 x 8 4096 x 16 Dual Single Beam LVDS Pad VDO HSYNC PCI Controller 32Bits 66MHz PCI 133MHz PCI X PCI Local Bus Specification rev 2 2 compliant PCI Express Specification beta 1 0a compliant Host Agent Mode Support 3 4 Express Devices in Host Mode Engine Controller LPEC1 LSU Interface unit Step Motor 2 Channels PWM 8 Channels ADC 6 Channels USB 2 0 Interface with Embedded USB 2 0 PHY Gigabit Ethernet Controller IEEE 802 3 compliant with 10 100 1000 Mbps full duplex GbE port Support GMII MII and RGMII interface with external PHY SERDES device Package 496pins PBGA Power 1 2V Core 3 3V IO power operation Speed 600MHz core ARM9 Compatible operation 200MHz bus operation Service Manual Samsung Electronics Summary of Product 3 3 1 2
37. Replace the main PBA Samsung Electronics Service Manual Troubleshooting 6 5 Maintaining the toner cartridge Toner cartridge storage To get the most from the toner cartridge keep the following guidelines in mind Do not remove the toner cartridge from its package until ready for use Do not refill the toner cartridge The printer warranty does not cover damage caused by using a refilled cartridge Store toner cartridge in the same environment as the printer To prevent damage to the toner cartridge do not expose it to light for more than a few minute Expected cartridge life The life of the toner cartridge depends on the amount of toner that print jobs require When printing text at ISO 19752 5 coverage a new toner cartridge lasts an average of either 20 000 or 10 000 pages The original toner cartridge sup plied with the printer lasts an average of 10 000 pages The actual number may also be different depending on the print density of the pages you print on and the number of pages may be affected by operating environment printing interval media type and media size If you print a lot of graphics you may need to change the cartridge more often Saving toner To save toner press Toner Save on the control panel The button backlight turns on Using this feature extends the life of the toner cartridge and reduce your cost per page but it also reduces print quality 6 5 1 Checking the remaining toner You can c
38. The fan will run or stop Duplex Fan ON OFF procedure and content above can be changed according to the situation 4 1 7 Clutch Sol These functions are to check a current state normal or not of the solenoids and clutches Usage 1 Press the Arrow Keys 4 until finding Component Test 5 Clutch Sol Test message on the panel 2 Press the OK Key when it is found 3 Press the Arrow keys until finding a suitable function Refer to the table below 4 Press the OK Key when it is found 5 Press the OK Key for execution or the Back key for retun Function Function Name Description Display LCD T1 P up Clutch The clutch will run or stop T1 P up Clutch ON OFF T2 P up Clutch The clutch will run or stop T2 P up Clutch ON OFF T3 P up Clutch The clutch will run or stop T3 P up Clutch ON OFF T4 P up Clutch The clutch will run or stop T4 P up Clutch ON OFF Bypass Clutch The clutch will run or stop Bypass Clutch ON OFF Duplex Sol The solenoid will run or stop Duplex Sol ON OFF The procedure and content above can be changed according to the situation Service Manual Samsung Electronics Alignment amp Adjustments 4 1 8 Fuser Ctrl This function is to check a current state normal or not of the fuser unit Usage 1 Press the Arrow Keys 4 until finding
39. and multi feeding prevention function 6 Registration roller It has a paper arranging function paper transferring function paper detecting function jam remov ing function and so on 7 MP tray It has a paper arranging function paper transferring function jam removing function and so on It uses rubbing pad method to feed 100 sheets of general papers and 10 envelops It is possible to extend to 300mm for accepting a legal size paper 8 Duplex unit It has paper transferring function paper guide function jam removing function paper sensing func tion and main board supporting function It is designed for basic attachment and the duplex feeding takes a side feeding method Usable papers are A4 letter and legal size paper For removing a jam occurred in a front part it is designed to open a cassette and a guide It is designed to open a rear cover to remove a jam in a rear part If a face up tray is open the duplex option cannot be used 9 SCF Second Cassette Feeder It is the same method with the main cassette and the capacity is 500 sheets It has a separate driving mechanism It is designed for a common use with a main cassette Service Manual Samsung Electronics Summary of Product 3 2 2 Transfer It consists of a PTL Pre transfer Lamp and a transfer roller A PTL sheds light on an OPC drum lowers an electric potential of an OPC drum s surface and improves the efficiency of the transfer A trans
40. as little as 5 mins can damage the surface s photoconductive properties and will result in print quality degradation Take extra care when servicing the printer Remove the OPC Drum and store it in a black bag or other lightproof container Take care when working with the covers especially the top cover open as light is admitted to the OPC area and can damage the OPC Drum Take care not to scratch the green surface of OPC Drum Unit If the green surface of the Drum Cartridge is scratched or touched the print quality will be compromised Service Manual E Samsung Electronics Precautions 1 2 5 Disregarding this warning may cause bodily injury 1 Be careful with the high temperature part The fuser unit works at a high temperature Use caution when working on the printer Wait for the fuser to cool down before disassembly 2 Do not put finger or hair into the rotating parts When operating a printer do not put hand or hair into the rotating parts Paper feeding entrance motor fan etc If do you can get harm 3 When you move the printer This printer weighs 22kg including toner cartridge and cassette Use safe lifting and handling techniques Use the lifting handles located on each side of the machine Back injury could be caused if you do not lift carefully 4 Ensure the printer is installed safely The printer weighs 22Kg ensure the printer is installed on a level surface capable of supporting its weight
41. been ended 4 Is the movement Up and Down of the transfer roller smooth 4 Clean the bushing part of the transfer roller 5 Is the HVPS normal 5 If the problem is still not solved replace the print cartridge Service Manual KI Samsung Electronics Troubleshooting 6 2 9 Ghost 1 L Description Ghost occurs at 95 mm intervals of the OPC drum in the whole printing J Digital Printer Digital Printer Digital Printer 66 6 2 10 Ghost 2 Check Cause Solution 1 Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the elec trode of the print cartridge 2 Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the one in the HVPS board 3 The life of print cartridge is expired 4 Transfer roller lifetime 150 000 sheets has expired 5 Abnormal low temperature below 10 C 6 Damaged cleaning blade in the print cartridge 1 Clean the terminals when contaminated by toner particles 2 Occur in the print cartridge replace the print cartridge and try to print out 3 Replace the engine board if not solved by the above directions 1 2 4 If not solved by the direction 3 check the transfer roller lifetime and replace it 5 Wait about 1 hour after power on before using printer 6 Occur in the print cartridge replace the print cart
42. check periodically at the top of a black image ribs that corresponds to the position of the voids Remove if found 5 It may occur when foreign substances 5 If the problems are not solved replace are on the OPC Drum the print cartridge 6 Partly depression or deformation on the 6 Replace the transfer roller if occured as surface of the transfer roller NO 6 Service Manual Samsung Electronics 6 2 3 Horizontal Black Band Troubleshooting 1 Dark or blurry horizontal stripes occur in the printing periodically Check and Cause Solution Digital Print Digital Printer 1 Bad contacts of the voltage terminals to Kali print cartridge Digital Printer Digital Print 2 The rollers of print cartridge may be stained Charge roller 38mm Develop roller 45mm Transfer roller 55mm OPC Drum 95mm 6 2 4 Black White Spot 1 Clean each voltage terminal of the Charge Supply Develop and Transfer roller remove the toner particles and paper par ticles 2 Clean the right Gear that has relatively small gap of the teeth in the OPC 3 If the malfunction persists replace the print cartridge pes eaphon 2 White spots occur periodically in the printing 1 Dark or blurry black spots occur periodically in the printing Check and Cause Solution Digital Printer Digital Print er 1 If dark or blurry black spots occur periodi Big cally th
43. cover Make sure that the cover is securely closed Service Manual Samsung Electronics Ga Troubleshooting 6 5 4 Toner Cartridge related messages Message Meaning Suggested solutions Install Toner A toner cartridge is not installed Install a toner cartridge Invalid Toner The toner cartridge you have Install a Samsung genuine toner cartridge designed for your printer installed is not for your printer Toner Low The toner cartridge is almost empty Take out the toner cartridge and thoroughly shake it By doing this you can temporarily reestablish printing operations NonGenuine Toner The toner cartridge installed is not You can select either Stop or Continue If you do not select any the Stop gt a genuine cartridge printer will work as Stop is selected If you select Stop you cannot print until the genuine cartridge is installed However you can still print any kind of reports If you select Continue you can keep printing but the quality cannot be guaranteed and the product support is no longer provided If you want to change the selection turn the printer off and on to have this message appear again and then re select Stop or Continue NonGenuine Toner The toner cartridge installed is not This message appears when you selected Stop at the NonGenuine Replace Toner1 a genuine cartridge Toner prompt Install the genuine toner cartridge NonGenuine Toner Replace Toner The toner cartridge installed is
44. occurs 3 The paper that passes a paper exit sensor takes several printing processes and moves to a paper exit sensor If the sensor does not operate after certain time a Jam 1 occurs 4 If the paper does not discharge until the paper passes an exit roller and a Roller Exit F Down a Jam 2 occurs 5 The printing paper starts to be printed for duplex only by reversing rotation by an exit motor The printing paper enters to a machine through an exit roller and reaches to duplex sensor If the printing paper cannot reach to the duplex sensor after certain time a duplex Jam 1 occurs 6 The printing paper that passes the duplex sensor reaches to a feed sensor again and a printing operation is tried over again If the printing paper cannot reach to a feed sensor after certain time later a duplex Jam 2 occurs Service Manual n Samsung Electronics Alignment amp Adjustments 4 2 1 Clearing Paper Jams Note When removing paper that is jammed in the printer if possible always pull the paper in the direction that it normal ly moves so as not to damage internal components Always pull firmly and evenly do not jerk the paper If the paper tears ensure that all fragments of paper are removed otherwise a jam will occur again When a paper jam occurs the Status LED lights red Open and close the top cover The jammed paper automatically exits the printer If the paper does not exit check the display on the control panel The messa
45. open board 2 Replace the main control board or cover open board Service Manual Samsung Electronics Troubleshooting 6 4 8 Defective motor operation Description Main motor is not driving when printing and paper does not feed into the printer resulting 0 Check and Cause Solution 1 The motor harness or motor PCB may be defective 2 Check the motor operation in the EDC mode 6 4 9 No Power 1 Replace the motor unit 2 Replace the main PBA Description When system power is turned on all lamps on the operator panel do not come on Check and Cause Solution 1 Check if the power input and SMPS output are normal 2 Check the inferiority of LED Panel or LDC window on the front cover if the OP panel does not appear after normal warming up 1 Replace the SMPS 2 Replace the control board EJ Service Manual Samsung Electronics 6 4 10 Vertical Line Getting Curved Troubleshooting e Description When printing vertical line gets curved Check and Cause Solution 1 If the supply of 24v is unstable in the main control board linking with LSU check drive by EDC mode LSU check 2 Chect the deve PBA in the print cartridge 1 Replace LSU 2 Replace the toner sensor PBA 2 Replace the main PBA Samsung Electronics Service Manual Troubleshooting 6 5 Maintaining the toner cartridge Toner cartridg
46. or fire hazard 4 Do not install the machine in areas with high dust or moisture levels beside on open window or close to a humidifier or heater Damage could be caused to the printer in such areas 5 Do not place candles burning cigarettes etc on the printer These could cause a fire 1 2 4 Assembly Disassembly Precautions Replace parts carefully always use Samsung parts Take care to note the exact location of parts and also cable routing before dismantling any part of the machine Ensure all parts and cables are replaced correctly Please carry out the following procedures before dismantling the printer or replacing any parts 1 Check the contents of the machine memory and make a note of any user settings These will be erased if the mainboard or network card is replaced 2 Ensure that power is disconnected before servicing or replacing any electrical parts 3 Disconnect printer interface cables and power cables 4 Only use approved spare parts Ensure that part number product name any voltage current or temperature rating are correct 5 When removing or re fitting any parts do not use excessive force especially when fitting screws into plastic 6 Take care not to drop any small parts into the machine 7 Handling of the OPC Drum The OPC Drum can be irreparably damaged if it exposed to light Take care not to expose the OPC Drum either to direct sunlight or to fluorescent or incandescent room lighting Exposure for
47. the paper feeds into the printer and Jam 0 occurs perform EDC Mode to check feed sensor of the engine board Service Manual KI Samsung Electronics Troubleshooting 6 3 3 JAM 1 1 Recording paper is jammed in front of or inside the fuser Description 2 Recording paper is stuck in the discharge roller and in the fuser just after passing through the Actuator Feed Check and Cause Solution 1 If the recording paper is jammed in 1 Replace the SMPS or Exit Sensor front of or inside the fuser 2 Replace the Main PBA 2 If the recording paper is stuck in the 3 Reassemble the Actuator Feed and discharge roller and the fuser just Spring Actuator if the movement is after passing through the Actuator bad Feed Feed Actuator may be defec tive 6 3 4 JAM 2 1 Recording paper is jammed in front of or inside the fuser Description 2 Recording paper is stuck in the discharge roller and in the fuser just after passing through the Actuator Feed Check and Cause Solution 1 If the paper is completely fed out of 1 Check if the exit sensor actuator is the printer but Jam 2 occurs Exit defective sensor is defective Check if the actuator exit is deformed After the paper is completely dis Check if the lever part is deformed charged actuator Exit should return in shape to the original position to shut the Check whether burrs occur in the photo sensor Sometim
48. 001165 SPRING TS 2 sa 7 4 1 8 JC61 012154 HOLDER MLEVER L 245095 1 SNA 4140 JC7240981A PMO ROLLERUPPERDP K4068 3 SA 4 1 12 JC61 01216A HOLDER MMEVER R j 4500 1 SNA 4 113 JC71 00052A ELECTRODE P SUPPORT 2441 2 SNA 4 1 15 4 1 KIT 4 1 KIT 4 1 16 4 1 17 4 1 19 A 4 1 16 JC66 01268B ROLLER HEAT Z4518 4 3 3 6107 001304 SPRING CS 24530 4 3 5 JC66 00880A LEVER P RELEASE L 24532 4 3 6 6107 001304 SPRING CS 24530 A 3 7 JC67 00102A CAP M FUSER LOCK 24533 E G SNA T LR Co 4 3 10 4 3 11 4 3 12 4 313 4 3 14 4 4 4 4 1 442 4 4 6 Y 1 1 1 1 1 5 2 1 3 3 1 2 1 1 1 1 2 2 4 2 1 1 1 1 1 2 1 1 1 1 1 2 1 1 1 1 1 2 1 1 2 1 L1 1 2 2 4 2 EF 1 L 2 1 4 31 JC66 00931A ROLLER PRESSURE KR 1 L 2 1 2 1 2 IE NNI Service Manual 7 13 Samsung Electronics Exploded Views amp Parts List 7 5 REGI Assembly Service Manual 7 14 Samsung Electronics Exploded Views amp Parts List Service SA service available SNA service not available Drawer 5 0 5 1 2 3 54 5 5 5 6 5 7
49. 08M ELAUNI DEVEMOTOR kor 1 SA 74 18 JC9604063A ELAUNITMAN O Z440 1 sj Rj i19 9641094 ELAHOUMAN zm t SN J 71191 _JC92 01823A_ PBAMAIN CONTROLLER zm 1 sa 71192 JC9201824A PBAMAINDMM Z 1 SA 7120 JC97 02220M MEAUNI GEARPICKUP cos 1 SA 71 201 JC66 00870M GEAR M MICKUP CAM 31 SNA J 71 202 JC69 00876M GEARM PICKUP zm t SM R 71 253 JC61 00005 SPRINGETC CAMMP S00 1 SA 71 21 JC97 04738A MEAUNIT GEARPIUPMPCARDNA Go47 31 SA 71 211 JC65 0M424A GEARMPHOLDER CAM 1 SA 72 212 JC66 04234 GEARMPPICK UP P2055 31 sj 71 2 3 JC61 00005 SPRINGETC CAMMP sox 1 SA 7422 JC66 10202A BEARING MICKUP B003 1 SA J 7423 JC61 00755A BRACKET SHAFTMP SA R i24 JC6101735A HOLDERFAN zam 3 sa RJ 7425 JC33000012A SOLENODLMAN sos 1 SA 7426 JC33 00016A soLENOID Mp S806 1 sj RJ 7427 JC9604121A ELAUNI DEVEERASER zarm 3 SA
50. 10K or 20K pages Duty cycle Monthly Up to 150 000 pages Service Manual Samsung Electronics Exploded Views amp Parts List 7 1 Main Assembly Service Manual Samsung Electronics Exploded Views amp Parts List Service Parts List ML 4551N ND NDR Service SA service available SNA service not available Drawer SEC Code Description Location Service zo O o 710 ML4558iN MONOLASER43PPWA amp NETWORK O L t 0 _ML 4561ND__ MONO LASER 43PPM A4 NETWORKDUPLEX t j RJ zia JC9604004A ELAUNI FRAMEBASE m 743 _JC97 022308 MEAUNITKNOCK UPMP 1 ss zasa _JC61 012518 PLATE M KNOCKUPMP wor 1 SA 7432 JC7400034 MPRPADKNOCKUPMP O omoa 1 ss RJ 71 33 207240068 PMO SIDEGUIEE 62301 1 SA 34 Jc72010058 PMo sIDEGUIDEMP 31 5 R 7435 JG66 40003A_ GEAR PINION 0127 5 R 72 38 JC66 00895A SHAFT REINFORCEMENT zo 1 5 JC9702231A MEAUNI COVERMP SEC 1 SA 7141 JC63 00695 COVERM MP SEC zw t SN J 142 JC63006915 TRAYM EXTEND MP 1 SA j
51. 2 Check whether a thermistor is open or not 3 Heat lamp ON OFF test 4 It could not operate due to a gear of a fuser is melted 6 4 2 LSU Error 1 Replace the fuser if a thermostat is open 2 Replace the fuser if a thermistor sensor is located deep inside of a sponge 3 Check whether the overheat mode circuit operates normally or not 4 Replace the fuser Description A message Engine Hsyne Error is displayed in a LCD panel Check and Cause Solution 1 Check whether the LSU connector is disconnected or not 2 Check whether the LSU motor is rotating or not 3 Check the HSYNC signal 1 Connect the LSU harness properly 2 Replace a LSU 3 Replace a main board if the same error occurs again after replacing a LSU CO Service Manual Samsung Electronics Troubleshooting 6 4 3 Not function of the gear of the fuser due to melting away U Description The motor breaks away from its place due to gear melting away Check and Cause Solution 1 Check the Fuser Unit 1 Replace the Fuser 2 Replace the Main PBA 2 Replace the SMPS 6 4 4 Paper Empty Description paper lamp on the operator panel is on even when paper is loaded in the cassette Check and Cause Solution 1 Bending or deformation of the actuator of the paper sen 1 Replace the defective actuator Sor 2 The function of the engine board is defective 2 Replace the empty
52. 3 1 5 LSU The LSU is consisted of the LD Laser Diode and the polygon motor control When the printing signal occurs it turns on the LD and drives the polygon motor When the detector detects the beam Hsync occurs When the polygon motor speed becomes strady Lready occurs If two conditions are satisfied the status are not satisfied the error shown in below occurs Error Type Description LCD Display Polygon Motor Error Whenthe polygon motor speed doesn t become steady LSU NOT READY Hsync Error The polygon motor speed is steady but the Hsync is not generated HSYNC ERROR Service Manual EJ Samsung Electronics Alignment amp Adjustments 4 Alignment and Adjustments This chapter describes the main functions for service such as the product maintenance method the test output related to maintenance and repair DCU using method Jam removing method and so on It includes the contents of manual 4 1 How to use EDC Engine Diagnostic Control Mode 4 1 1 EDC Setup EDC Engine Diagnostic Control EDC will be used below is considered to test and check whether each functions of machinery and h w module are normal or not All of the test function are able to be controlled by the keys and LCD window on the panel without any other kits It s developed for related engineers not for users 4 1 2 Entrance method for EDC In order to enter the EDC mode the entering method should be special because this mode is develo
53. 5 00006A_ TERMINAL PHVCARDINAL K427 4 4 1 1 SA SA SA SA SA 392 SA 3 93 5 SA SA SA SA 3 95 JC92 01831A SUB EMPTY 24502 9 96 JC39 00620A HARNESS SENSOR Z4503 9 97 JC92 01262C SUB FEED SENSOR M0446 9 98 JC67 00098A HV Z4504 9 99 JC67 00097A SENSOR FEED Z4505 9 94 JC70 00332A IPR P GROUND OPC O0020 o EU ll o r r Taeo y SNA Service Manual 7 11 Samsung Electronics Exploded Views amp Parts List 7 4 Fuser Unit 7 12 Service Manual Samsung Electronics Exploded Views amp Parts List Service SA service available SNA service not available SNA 4 1 21 4 1 22 4 1 24 4 1 25 4 1 26 4 1 28 4 2 1 4 2 3 JC66 00869A _ GEAR M IDLE 25 24527 4 3 JC97 02630A UNIT FUSER LOWER 24528 Drawer Code Description Location Service 7 4 0 JC96 03957B ELAUNIT USER 22V 2456 1 SA 7 4 0 JC96 03957A JELAUNIT FUSER 110 2456 1 SA 7 4 1 JC96 039584 ELAUNIT FUSER 22457 1 SNA 7 4 1 JC96 03958B ELA UNIT FUSER_UPPER 245077 1 SNA 7 4 1 2 71 00056 ELECTRODE P FUL 08 2458 1 SNA 7 4 1 4 JC72 41012C PMO GUIDECLAWGREEN 2018 5 SA 7 4 1 5 6107
54. 5 8 9 E 5 5 5 x JC72 00998A PMO ACTUATOR REGISHUTTER P0030 6107 001165 SPRING TS JC61 00670A GUIDE P REGI PLATE G2081 5 5 10 5 11 5 12 5 13 5 14 Service Manual 7 15 Samsung Electronics Exploded Views amp Parts List 7 6 Main Motor Assembly Samsung Electronics 7 16 Service Manual Exploded Views amp Parts List Service SA service available SNA service not available SEC Code 6 7 6 8 6 9 7 6 8 JC66 00865A_ GEAR M RDCNREGI 1 24550 7 6 9 JC66 00866A GEAR MRDCNPICKUP 24551 JC66 00875A GEAR M FUSER IDLE 1 24549 Service Manual 7 17 Samsung Electronics Exploded Views amp Parts List 7 7 Deve Motor Assembly Service Manual 7 18 Samsung Electronics Exploded Views amp Parts List Service SA service available SNA service not available Service 770 JC96 03408A MOTOR 57 1 SNA JC31 00039A MOTOR DC BLDC DEVE B5012 1 21 7 7 2 JC61 012014 BRACKET P DEVE 24556 SNA P CU Un S 274 666 00915 SHAFT SWING DEVE 24558 JC66 00871A SEAR M RDCN DEVE 24559 7 0 7 1 7 2 E T4 7 5 Service Manual 7 19 Samsung Electronics Exploded Views amp Parts List 7 8 Duplex Sorenoid Assembly Service Manual Samsung Electronics Exploded Views amp P
55. 567 89 ABCDEFGHIJK 2 ABCDEFGHIJKLMNO E E Stephen J Singel Labanda Sinpat Abarress Tendar BSF URANGLE Funtres Solber Netener 23 January 2004 Jonathan Q Maderia Inpert Mampem Abaress 2343 Stantin Dawer Lank Benhibe SDF Mr Maderia Nam liber tempor cum soluta nobis eleifend ption cogue nihil consequat velillum Dolore eu zril feugiat nulla acilisis at vero eros accumsan et iusto odio dignis sim qui blandit praesent lutatum ril lobortis nis ut aliquip exea commodo consequat Duis autem vel eum ireure dolor in hendreritin vulputate velit esse molestie tincidunt ut laoreet dolore magna aliquam erat volutpat Ut wisi enim ad minim viniam quis nostrud exerci tation ullam corpersus cipit lotis nisl Q pel Q E Z n 4 lt lt N o N oo el g esl x Q ES a Kali A ut aliquip ex ea commodo consequat Lorem ipsum dolor sit Amet consectetuer adipiscing elit sud diam nonummy nibh veniam recneps adipiscing elit sed diam nonummy nibtil laoreet dolore magmana aliam erat volutpat Ut wisi enim minim veniam quisient nostrud Solyom uta nobis eleifendoptn cogue nihil imerdiet domg id quod mzim plerat facer posim aum Lorem ipsm dolor sit amet consectuer Duis autem vel eum iriure dolor in hendreritin vulputate velit cesse ea commodo molestie Nam liber tempor cum soluta nobis eleifend option cogue nihil consequat A B D E v
56. 74 5 J063 006948_ TRAY M_LINKMP eae 1 SA 746 JC63006898 TRAYM LINK MPI 1 SA 717 _J066 005408 RoLLER TRANSFER zw 1 ss R 718 JC9601729A ELAUNI HOLDERTRR O eae 1 SA 83 JC7241142A PMO USHNGTR zw 1 S5N amp 71 82 JO61 00046A_ SPRING ETC TRRHAWK zoa o 5 71 2 JC7241145C PMO TRANSFERHOLDERR zws 1 SN 7184 JC70 M053 PRPLATETR O O o 246 1 SN 74 9 9647308 ELAUNI HOLDER IRL z6t6 1 5 7 9 1 JC72411442A PMO BUSHNG TR 246 1 SN 7492 _JC61 00046A_ SPRING ETC TRRHAWK zoa t SN J 93 _JC72 41145F PMO TRANSFERHOLDERL 1 5 74 10 Jcz2412028 PMOo caPTR O O T 20015 3 5 i41 JC69000594 GEARCIR O O o T G t SA R i12 JC96039594 ELAUNI REGI 1 SA R 74 13 JC6600420A GEARREGIZ8 OO 1 SA 7444 JC6700059 CAP M GEAR 103 t 5 74 16 JC9604068M ELAUNTTLISU O t SA R 74 16 JC9603426A ELAUNILEXITSOL 74 17 JC96034
57. 9 7zIN ocasr d9 ey YILIN HOLATO YOSNAS YO LOW dISZ BEY dos H3A180 HOSN3S NYIS A3M YSAIYO 031 021 TANVd 052871 d9I 1H912 0v8 2X91 091 eMd90L ASIA i 1 Service Manual KI Samsung Electronics Block diagram IWN p pp qu 4 ns1 07 joujoy ET Wace L Xa 2 5 gsn 10 lod L N N SNA WILSAS 24 199 sng N mail m as q q ZUINOOYT o o AINZ g ZUIN EE 5 5 jeng 19 2 OL 1J oJJuoO HNW009 q q 8 S3489 q q SN Samsung Electronics E Service Manual Connection Diagram 9 Connection Diagram PWM_DEV_AC 24V PWM DEV Vpp 24V DEV AC CON 24V PWM DEV DC 24VS PWM FUSER BIAS eh Abe 24VS SMPS PWM_MHV HVPS_PSAVE PWM_THV GND THV_READ VCC nTHV_EN GND FUSER_ON GND Fuser_Cover GND MHV_READ GND GND GND pa 24 1 FAN MAIN FEEDBA 2 FAN MAIN FAN SMPS FEEDB FAN SMPS P FEED 3 3V GND OUTBIN FULL EEPRIM SDA VCC EEPROM_SCL P_MARGIN GND P REGI P SIZE1 P EMPTY P SIZE2 SIZE3 MAIN CONTROLLER 1 24vs ines MAIN_CLUTCH 01 Url REGI_CLUTC
58. A SA SA SA SA SA SA SA SA SA SA SA SA ML 4551NDR A A A A A A A A A A A A A A A A A A A A A A A A Service Manual 7 6 2 Samsung Electronics Exploded Views amp Parts List 66 7 3 Frame Assembly 1 2 7 7 Service Manual Samsung Electronics Exploded Views amp Parts List Frame Assembly 2 2 Service Manual 7 8 gt Samsung Electronics Exploded Views amp Parts List Service SA service available SNA service Drawer Location QTY 3 0 24398 3 0 24398 24440 24441 3 2 1 24442 3 2 2 0042 3 2 3 P2043 3 2 4 K3144 d n gt J w gt o o BIT 3 241 P2062 3 2 4 2 H0025 3 2 4 3 C4024 3 E4065 3 3 1 24443 D gt 3 92 Z4444 3 3 3 Z4445 3 3 4 3 3 5 24446 3 3 6 24536 3 3 7 R0006 3 H1297 3 4 2 JC61 00684A HOLDER M PAD H4029 D 3 4 1 JC61 01248A 7 FRAME M HOLDER PAD 24448 3 4 R0019 344 0028 3 4 5 W3028 346 01099 n gt gt 3 4 7 0604 001095 PHOTO INTERRUPTER P0013 3 4 8 JC39 00451A CBF HARNESS MP EMPTY H1253 3 5 JC97 01034A RACK EXIT ROLLER E4060 3 5 1 JC72 41006A PMO HOLDER EXIT ROLL E4126 9 5 3 JC72 41008A PMO ROLLER FD R P0049 3 5 4 JC61 70911A SPRING ETC EXIT ROLL FD D Ps pr p lt
59. Bias The bias will have the previously saved value DEV Vpp Bias ON OFF MHV Bias The bias will have the previously saved value MHV Bias ON OFF PTL The lamp will be lighted or not PTL ON OFF Service Manual Samsung Electronics Alignment amp Adjustments Function Name Description Display LCD Remarks Erase Lamp The lamp will be lighted or not Erase Lamp ON OFF THV Read The Adc will be displayed on the panel THV Read xxx xxx is its ADC MHV Read The Adc will be displayed on the panel MHV Read xxx Xxx is it s ADC The procedure and content above can be changed according to the situation 4 1 11 Print Test and Option version These functions are to check a total print process state and the option 5 version Usage 1 Press the Arrow Keys 4 until finding Component Test 10 Print Test message on the panel 2 Press the OK Key when it is found 3 Press the arrow keys until finding a suitable function Refer to the table below 4 Press the OK Key when it is found 5 Press the OK Key for execution or the Cancel key for stop Function Function Name Description Display LCD Remarks Pattern Print The printer can print the previously saved mode Pattern Print ON Simplex or Duplex Copy pattern kind T2 Version This is the version for Tray2 T2 Version x xx is versio
60. Cover Right Refer to the 5 7 Main Solenoid 2 Unplug the all Connectors from the Connector PBA and take it out 2 O Main Clutch MP Solenoid TA E ol MP Empty Cassette Open S W O O Z a Connector a 4 PBA Main PBA Service Manual Samsung Electronics Disassembly and Reassembly 5 12 Solenoid 1 Before you remove the Solenoid you should remove 4 Remove one screws and take out the Main Solenoid Cover Right Refer to the 5 7 Main Drive Ass y Refer to the 5 9 2 Unplug the MP Solenoid Harness and the Main Solenoid Harness from the Connector PBA NOTICE It is not necessary to disassemble the Main Drive Ass to remove the MP Solenoid 3 Remove one screws and take out the MP Solenoid Service Manual Samsung Electronics Disassembly and Reassembly 5 13 Rear Cover 1 Open the Rear Cover and then take out the Stopper 2 Remove the Rear Cover in the direction of arrow Service Manual EJ Samsung Electronics Disassembly and Reassembly 5 14 Cover Left 3 Take out the Cover Left 1 Pull the Cassette out of the printer Yi Cover Left Cassette 2 Remove two screws and take out the lef
61. E1284 USB IEEE1284 USB 2 010 100 Base TX 2 010 100 Base TX Optional Interface 10 100 Base TX 10 100 Base TX 10 100 Base TX N A N A Paper Handling Paper Input Capa Type 500 Sheets 500 Sheets 500 Sheets 550 Sheets Cassette 500 Sheets Cassette100 MP Tray Cassette100 MP Tray Cassette100 MP Tray 150 Sheets Cassette Cassette100 MP Tray Paper Output 250 Sheets Face down 250 Sheets Face down 500 Sheets Face Down 500 Sheet Face down 250 Sheets Face Down 100 Sheets Face up 70 Sheet Face up Others Max Monthly Duty 150 000 sheets 200 000 sheets 225 000 sheets 225 000 sheets Consumable Yeild Standard 10K Standard 10K Standard 6K 17K Standard 18K High Yield 20K High Yield 20K High Yield 21K High Yield 27K Power Consumption Printing Less than 650 W Printing 680 W not inform Printing lt 593W not inform Sleep under 13 W Sleep under 20 W Sleep 12W Duplex Option Option Option Option NO Options Memory 128MB 256MB Memory 250 sh duplexer SCF duplexer 3x500 sheet SCF 500 sheet SCF 3x250 sh drawer Memory 85 envelope Duplex Duplex 2000 sh drawer Max 3850 Stand feeder 40GB HD HP Jetdirect 85 sh envelope feeder Sorter Mail box 500 sheet cassette 20GB HD 650 sh output expander 250 sheet cassette Stacker 8 Stapler 1850 sh High capacity output stacker 40 sheet staple 5 bin mailbox 5x120 sh Service Manual Samsung Electronics Specifications 2 4 ACCESSORY
62. H CENCE 3 3V JENSON sav f oeno Temi fd elo lt lt PANEL TXD PANEL RXD nRSTOUT DGND 3 3V TDO nTRST TCK TMS JTAGi nRESET B 24V 3 3V Duplex nDuplex Detect Duplex TXD GND lt o u gt gt 1219191915 s 5 S ISIS DUPLEX_DETECT 14 ISCF IF ISCF PSAVE nd a o u o Q c 24VS 24VS MAIN MAIN_MOT_READY gt x gt Z lt 6 010 gt gt gt 121212 555 ola 9 DGND LSU 5VS LD POWER2 VDO1_plus VDO2_minus VDO2_plus nLD EN nSH1 nHSYNC_plus nSH2 LSU_CLK SU LS HDD 3 z 56 2 ZIO 6 3 2m 8 512 2 5 14 nLREADY nLSU MOT ON DGND 24VS 16 16 56 60 5V 3 3V SDA DGND DGND DATA nHDD IORDY w e z z z alz ola o 9 o 9 9 9 o nwR nINT_HDD 3V Therm IN R Terr ner 24vs 2 DGND 3 nDEV_MOT_RDY is Dev MOT DR DGND D 24 5 BN DPX SOL 3 3V 24VS LSU SAVE lt LSU_5V Samsung Electronics Service Manual ES Connection Diagram
63. Laser printer Network for work Group Specification 43ppm Ltr 45 500MHZ Processor 128MB Memory 2 2 Specifications 10K initial 20K sailes USB Hight Speed USB 2 0 Network Option ML 4551N ML 4551ND Network base Face Down 250 sheets Face Up 100 sheets Product Specifications are subject to without notice See below for product specifications 2 2 1 General Specifications Engine Speed Simplex ML 4550 SERIES ML 4550 ML 4551N Up to 43 ppm in A4 45 ppm in Letter ML 4551ND Duplex Option 29 ipm in A4 30 ipm in Letter Warmup time Less than 45 sec Power on boot FPOT From Ready Less than 8 5 sec From Idle Less than 43 5 sec From Coldboot Less than 53 5 sec Resolution Up to 1200 x 1200 dpi effective output Samsung Electronics Service Manual ES Specifications 2 2 2 Controller amp SW Processor ML 4550 SERIES ML 4550 ML 4551N Marvell 500Mhz ML 4551ND Memory 128 MB 512MB 256 256 Printer Languages PostScript3 PCL6 IBM ProPrinter EPSON PDF Direct only HDD installed Fonts 45 scalable 1 bitmap 136 PostScript 3 fonts OCR Fonts Driver Default Driver PCL6 Win 95 98 NT4 0 2000 Me XP 32 64bits 2003 Server 32 64bits PS Linux amp Mac Supporting OS Windows 95 98 NT4 0 2000 Me XP 32 62bits 2003 Server 32 62bits Various Linux OS including Red Hat 8 9 Fe
64. Memory NOR Flash Memory It stores System Program and downloads the System Program through PC Interface and in case of model for export it compresses the PCL font then stores it Capacity 128M Byte Access Time 70 nsec DDR SDRAM It is used as Swath Buffer System Working Memory Area etc when printing It stores Font List compressed into Flash memory on DRAM and uses it as PCL font in case of model for export Capacity 128 Byte Basic up to 512Mbyte User Option Type DDR II SDRAM 200MHzZ 32bit 3 3 1 3 Others The Option PBA can be mounted for supporting the serial communication Service Manual EJ Samsung Electronics Summary of Product 3 3 1 4 88F5281 Internal Block Diagram Feroceon CPU 32 KB L1 Dcache 32 KB L1 Icache p Local bus 4 bit up to 200 MHz 1 Mbus L to Dual Channel Mbus 32 bit up to 200 MHz Bridge DDR1 DDR2 SDRAM Controller Z Mbus Crossbar extension 64 bit 166 MHz 4 ZS GPPs 2 d 3222 UART x2 E PCI PCI PCI X Gigabit USB 2 0 TWSI Ethernet port Flash x1 po por port EJ Service Manual Samsung Electronics Summary of Product 3 3 1 5 Sensor Input Circuit 3 3 1 5 1 Paper Empty Sensing The Paper empty sensor Photo Interruptor on the engine board informs th
65. N ML 4551ND Black Standard 10K pages ISO 19752 standard Coverage High Yield 20K pages ISO 19752 standard Coverage Key Electronic key CRUM Life detect Toner remaining volume would be traced via software Yield Same as consumables 2 2 5 Reliability amp Service Printing Volume SET AMPV ML 4550 SERIES ML 4550 ML 4551N ML 4551ND 5 000 sheets month Max Monthly Duty 150 000 sheets MPBF 150 000 sheets MTTR 20 min SET Life Cycle 500 000 sheets or 5 years whichever comes first 2 2 6 Environment Acoustic Noise Level Sound Power Pressure ML 4550 SERIES ML 4550 ML 4551N ML 4551ND Printing Less than 57 0 dBA Standby Less than 35 0 dBA Sleep Back Ground Level Power AVG Less than 650W Consumption Sleep Power Off Less than 13W Dimension WxDxH SET 396 x 453 x 353 mm 15 6 x 17 8 x 13 9 396 x 501 x 353 mm 15 6 x 19 7 x 13 9 SET Packing Toner Packing SET 17 8kg 39 2 Ib 19 1kg Toner 10K 10K 1 85kg 4 08 Ibs 20K 2 06kg 4 54 Ibs Gross 21 6kg 47 62 Ibs 23 5kg 51 81 Ibs E Service Manual Samsung Electronics Specifications 2 2 7 Options ML 4550 SERIES ML 4550 ML 4551N Memory 128MB 512MB 256MB 256MB ML 4551ND Second Cassette 500 sheet Cassette Tray Third Cassette 500 sheet Cassette Tray Stacker N A Stapler N A PostScript Default Wired Network Ethernet 10 100 Ba
66. SISIESISIESIESIESENSESN ES P lt P lt P lt P lt p lt p lt P lt D lt P lt P lt P lt P lt P lt p lt q to SA Service Manual 7 9 Samsung Electronics Exploded Views amp Parts List ExplodedView Parts ist vice SA service available SNA service not available 3 47 5 Z4466 1 SN 3 48 K3062 1 S 7 3 48 1 Z4467 SNA sd 3 48 2 24468 3 48 3 24469 n z 3 48 4 JC66 00889A 5 ROLLER BELT 24470 9 48 5 JC66 00887A ROLLER M IDLE BELT Z4471 SNA SNA 3 48 6 02149 3 48 7 4020 3 48 8 24472 24473 3 49 2 H6035 3 493 C4026 O n Q D NIM SIS z gt gt 2 D e 5 3 494 K4021 S 3 49 5 Z4474 3 49 6 24475 3 49 7 24476 3 498 3 499 Z4477 3 49 10 K2883 3 49 11 0028 3 49 12 Z4479 5 5 D S S 3 49 14 24480 3 50 K3060 O Q n z 9 50 1 JC61 01242A HOLDER IDLE FEED2 Z4481 n z 3 50 3 JC61 00387A SPRING ETC PAD 0028 D 3 50 2 JC67 00105A CAP M IDLE FEED2 24482 D e 3 50 5 JC66 00912A SHAFT IDLE FEED2 S4108 s s SNA s s n O 8 B d 3 IDLE 3 53 L6057 3 54 L6058 3 55 P0032 3 56 Z4484 SNA H E B PICK 2 g P n 3 57 Z4485 SNA 3 58 K3816 3 59 K3141 3 59 1 54118
67. TTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA N KYM TT M LLE LASER STEILYLLE L KATSO S TEESEEN PRET ie USAMA 0 GS SH FASAL Service Manual KI Samsung Electronics Precautions 1 2 Caution for safety 1 2 1 Toxic material This product contains toxic materials that could cause illness if ingested 1 If the LCD control panel is damaged it is possible for the liquid inside to leak This liquid is toxic Contact with the skin should be avoided wash any splashes from eyes or skin immediately and contact your doctor If the liquid gets into the mouth or is swallowed see a doctor immediately 2 Please keep toner cartridges away from children The toner powder contained in the toner cartridge may be harmful and if swallowed you should contact a doctor 1 2 2 Electric Shock and Fire Safety Precautions Failure to follow the following instructions could cause electric shock or potentially cause a fire 1 Use only the correct voltage failure to do so could damage the printer and potentially cause a fire or electric shock 2 Use only the power cable supplied with the printer Use of an incorrectly specified cable could cause the cable to overheat and potentially cause a fire 3 Do not overload the power socket this could lead to overheating of the cables inside the wall and could lead to a fire 4 Do not allow water or other liquids to spill into the printer this can caus
68. al Printer on the face of page will occur OPC Cleaning Mode Print 2 or 3 times And perform Self Test 2 or 3 times to remove contamination Service Manual 6 7 Samsung Electronics Troubleshooting 6 2 13 Stains on the Back of Page Description back of the page is stained at 55 or 126 mm intervals J Check and Cause Solution 1 55mm Transfer roller is contaminated 1 1 Perform the OPC Cleaning Mode Print 2 or 3 times Run Self Test to remove the Digital Printer contamination of the transfer roller Digital Printer 1 2 Replace the transfer roller if contaminated Digital Printer severely 2 126mm Pressure roller is contaminated 2 1 Perform the fuser cleaning mode print 2 or 3 tiones 2 2 Disassemble the fuser and clean the H R Heat Roller and P R Pressure roller And check the area between H R and Thermistor If contaminated clean the area not to be deformed 6 2 14 Blank Page Print out 1 Description Blank page is printed J Check and Cause Solution Bad ground contacts in OPC and or print 1 Check if the Ground OPC is defective set cartridge inside left side 2 Remove contamination of the terminals of the print cartridge and the unit 6 2 15 Blank Page Print out 2 1 Blank page is printed Description 2 One or several blank pages are printed 3 When the printer turns on several blank pages print
69. al memory but it actually comes from the insuffi cient space of the hard disk Service Manual Samsung Electronics Troubleshooting 6 6 4 SPOOL Error To spool which stands for simultaneous peripheral operations online a computer document or Description task list or job is to read it in and store it usually on a hard disk or larger storage medium so that it can be printed or otherwise processed at a more convenient time for example when a printer is finished printing its current document Check and Cause Solution Insufficient space of the hard disk in the directory assigned for the basic spool 2 If the previous printing error not solved 3 When expected to collide with other program 4 When an application program or the printer driver is damaged 5 When some files related to OS are damaged or virus infected 6 Memory is less than suggested one Za How to delete the data in the spool manager 1 Delete the unnecessary files to provide more space to start printing job 2 If there are some files with the extension name of jnl Delete them and Reboot the Windows to restart printing job 3 Shut down all other programs except the current one if possible 4 Delete the printer driver completely and reinstall it 5 After rebooting the computer check for viruses restore the damaged files and reinstall the program to do the printing job 6 Add up eno
70. artridge Note The fuser area is hot Take care when removing paper from the printer 1 Open the top cover and pull the printer cartridge out 3 Remove the jammed paper by gently pulling it straight out If you do not see the jammed paper or if there is any resistance removing the paper stop pulling and go to Caution To prevent damage to the printer cartridge the paper exit area do not expose it to light for more than a few minutes Cover it with a piece of paper if necessary 4 Flip down the guide feed Do not touch the green surface underside of the printer cartridge Use the handle on the cartridge to avoid touching this area 2 Carefully lift up the guide feed 5 Replace the printer cartridge and close the top cover Printing automatically resumes Note If it is difficult to reinstall the printer cartridge make sure that the guide feed has been flipped back down into position m Service Manual Samsung Electronics Alignment amp Adjustments 4 2 1 3 In the paper exit area 1 Open and close the top cover The jammed paper is 3 Open the rear cover automatically ejected from the printer 4 By pusing the fuser levers upwards loosen the 2 Gently pull the paper out of the output tray jammed paper Then gently pull the paper straight out If you do not see the jammed paper or if there is any resistance when you pull st
71. arts List Service SA service available SNA service not available Drawer 8 8 8 8 8 8 8 8 8 8 10 8 11 8 12 0 E 1 2 3 B 84 5 25 a 8 9 P Service Manual 7 21 Samsung Electronics Exploded Views amp Parts List 7 9 Cassette Assembly Service Manual 7 22 Samsung Electronics Exploded Views amp Parts List Service SA service available SNA service not available EDS prm JC61 00267B GUIDE M LOCK A JC61 00414A SPRING ETC GUIDE PAPER JC64 00190B KNOB M REAR N Q FRAME M_CASSETTE GUIDE M_REAR 9 9 9 10 9 11 9 11 9 12 9 13 9 14 9 15 9 16 9 17 9 18 9 19 9 20 9 21 9 22 9 23 9 24 9 25 9 26 9 27 9 27 9 28 GUIDE M EXTENSION CST GUIDE M EXTENSION CST BRACKET P EXTENTION SPRING ETC LOCKER PLATE GEAR PINION CAP M GUIDE SIDE L GUIDE P SIDE L PMO LOCKER PLATE GUIDE M PAPER SIZE MEA UNIT HOLDER PAD SPRING ETC EXIT ROLL FD HOLDER M PAD HOUSING GUIDE PAPER SHUTTER PATH SPRING ETC PLATE K UP PLATE P KNOCK UP RPR PAD CASSETTE GUIDE M HANDLE UIDE M HANDLE JC68 01552A LABEL R CASSETTE Q ML 4551NDR ML 4551NDR ML 4551NDR ML 4551NDR Service Manual 7 23 Samsung Electronics Exploded Views amp Parts List 7 10 Duplex Unit Service Manual 7 24 Samsung Electronics Exploded Views amp Parts
72. ble with an optional hard disk b Available with an optional duplex unit in the ML 4550 or ML 4551N c Available with an optional network interface card for the ML 4550 3 4 Service Manual Samsung Electronics Summary of Product 3 1 3 3 Special Features Your new printer is equipped with special features that improve the print quality giving you a competitive edge You can Print with excellent quality and high speed DPI You can print up to 1200 x 1200 dpi effective output See the Software Section 9922 Your printer prints A4 sized paper at up to 43 ppm a and letter sized paper at up to 45 ppm For duplex printing your printer prints A4 sized paper at up to 29 ipm b and letter e e e 1 200 sized paper at up to 30 ipm Handle paper flexibly multi purpose tray supports letterheads envelopes labels transparencies custom 2100 a sized materials postcards and heavy paper The multi purpose tray holds up to 100 S sheets of plain paper 500 sheet standard tray 1 supports plain paper in various sizes 500 sheet optional tray support plain paper in various sizes You can install up to 3 additional trays Two output tray select either the output tray face down or the rear cover face up for the most convenient access Straight through paper path capability from the multi purpose tray to the rear cover Create professional documents Print Watermarks You can customize y
73. cessary files to secure enough The printing job sometimes stops or due to insufficient space of the hard disk and start printing job again virtual memory but it actually comes from the insuffi cient space of the hard disk Service Manual Samsung Electronics Troubleshooting 6 6 4 SPOOL Error To spool which stands for simultaneous peripheral operations online a computer document or Description task list or job is to read it in and store it usually on a hard disk or larger storage medium so that it can be printed or otherwise processed at a more convenient time for example when a printer is finished printing its current document Check and Cause Solution Insufficient space of the hard disk in the directory assigned for the basic spool 2 If the previous printing error not solved 3 When expected to collide with other program 4 When an application program or the printer driver is damaged 5 When some files related to OS are damaged or virus infected 6 Memory is less than suggested one Za How to delete the data in the spool manager 1 Delete the unnecessary files to provide more space to start printing job 2 If there are some files with the extension name of jnl Delete them and Reboot the Windows to restart printing job 3 Shut down all other programs except the current one if possible 4 Delete the printer driver completely and reinstall it
74. ck or transparencies using manual feeder Digital Printer Digital Printer Digital Printer G6 Check and Cause Solution When printing on card stock thicker than nor mal paper or transparencies such as OHP higher transfer voltage is required Select Card stoc or OHP Film on paper type menu from the software application and after using returning to the original mode is recommended Service Manual Samsung Electronics Troubleshooting 6 2 11 Ghost 3 Fuser L e Description Ghost occurs at 126 mm intervals Check and Cause Solution Digital Printer The temperature of the fuser is maintained high Digital Printer 92 Digital Printer 6 2 12 Stains on the Face of Page 1 Disassemble the fuser and remove the contaminated toner particles on the roller and clean the foreign matter between Thermistor and Heat roller Caution can be deformed Description background on the face of the printed page is stained J DE ME Check and Cause Solution Digital Printer Diai D reta 1 Toner leakage due to improperly sealed 1 Replace the print cartridge and clean to igital Printer 4 Me print cartridge the toner powder of machine Digital Printer oa W redet gee Digital Printer 2 If the transfer roller is contaminated stains 2 If the transfer roller is contaminated run Digit
75. cted Do not touch the machine or the power cord if it is still connected to the wall socket in these weather conditions 10 Avoid damp or dusty areas install the printer in a clean well ventilated location Do not position the machine near a humidifier Damp and dust build up inside the machine can lead to overheating and cause a fire 11 Do not position the printer in direct sunlight This will cause the temperature inside the printer to rise possibly leading to the printer failing to work properly and in extreme conditions could lead to a fire 12 Do not insert any metal objects into the machine through the ventilator fan or other part of the casing it could make contact with a high voltage conductor inside the machine and cause an electric shock KI Service Manual Samsung Electronics Precautions 1 2 3 Handling Precautions The following instructions are for your own personal safety to avoid injury and so as not to damage the printer 1 Ensure the printer is installed on a level surface capable of supporting its weight Failure to do so could cause the printer to tip or fall 2 The printer contains many rollers gears and fans Take great care to ensure that you do not catch your fingers hair or clothing in any of these rotating devices 3 Do not place any small metal objects containers of water chemicals or other liquids close to the printer which if spilled could get into the machine and cause damage or a shock
76. d Continue at the Toner Exhausted prompt Install the genuine toner cartridge Service Manual Samsung Electronics Troubleshooting 6 6 The cause and solutions of bad environment of the software 6 6 1 The printer is not working 1 Description While Power turned on the printer is not working the printing mode Check and Cause Solution 1 Run Self Test Mode Turn the power on while pressing the test printing button for 2 or 3 seconds before printing works 2 Check if the PC and the printer is properly connected and the print cartridge installed 3 Printing is nor working in the Windows 4 Check if the printer cable is directly connected to periph eral devices 1 Check the power of the printer and perform the Self Test If the test printing works that means no prob lems in the printer itself If the test printing does not work that means bad functioning of the printer not because of software 2 Replace the printer cable If the problems not solved even after the cable replaced check the amount of the remaining tone refer to print cartridge Service 4 5 Check if the connection between printer port is proper If you use windows check if the printer dri ver in the controller is set up If the printer driver is properly set up check in which program the printing is not working The best way to find out is to open the memo pad to check the function of printi
77. d friction with soft cloth dampened with IPA Isopropyl Alcohol 4 Use the smooth paper Description If contaminated at intervals of 57mm on the back of a paper Solution Check and Cause 1 Contamination of the pressure roller or heat roller Background Hot off set 2 Check the claw of the fuser whether it is deformed After disassembling the fuser clean contami nation between the heat roller and the ther mostor and remove the contamination of the pressure roller N If there is heavy background repair it by the background troubleshooting method 3 Clean the surface of the heat roller with IPA or water 4 Check the warp or separation of the print claw and the holder plate claw and then manage it Service Manual Samsung Electronics Troubleshooting 6 3 9 Paper rolled on the OPC Drum Description Paper is rolled up in the OPC Check and Cause Solution 1 Paper is too much thin 2 The face of paper is curled 1 Recommend to use normal paper 2 How to remove the rolled paper in the OPC Remove the paper while turning the OPC against the ongoing direction Clean fingerprints on the OPC softly with soft cloth dampened with tissue Samsung Electronics Service Manual ng Troubleshooting 6 4 The cause and solution of the malfunction 6 4 1 Fuser Error Description panel A message Engine Fuser Low Heat Erro
78. dora Core 1 3 Mandrake 9 2 10 1 and SuSE 8 2 9 2 Mac OS 8 6 9 2 10 1 10 4 WHQL Windows 2000 XP 2003 Server Wired Network Protocol N A SPX IPX TCP IP SNMP HTTP 1 1 AppleTalk Supporting OS N A Windows 98 ME NT4 0 2000 XP 32 64bits 2003 Server 32 64bits Netware 4 x 5 x 6 x Mac OS 8 6 9 2 10 1 10 4 Various Linux OS including Red Hat 8 0 9 2 Fedora Core 1 3 Mandrake 9 2 10 1 and SuSE 8 2 9 2 Wireless Network Protocol N A Supporting OS N A Application RCP N A Status Monitor N A Smart Panel YES Include RCP and SM Network Management N A Interface Parallel IEEE 1284 USB High Speed USB 2 0 Wired Network Optional 10 100 Base TX Wireless Network N A User Interface LCD 16 x 12 Character LCD LED 2LED Status LED Save Button LED Key 8 Key Menu 4 OK p Back Toner Save Demo Stop Service Manual Samsung Electronics Specifications 2 2 3 Paper Handling ML 4550 SERIES ML 4550 ML 4551N ML 4551ND Standard 500 sheet Cassette Tray 100 sheet Multi Purpose Tray 759 m Capacity Max Capacity 2 100 sheets 75g m Printing Max Size 216 x 356 mm 8 5 x 14 Min Size 76 x 127 mm 3 0 x 5 0 gt 105g Multi purpose tray Capacity 100 sheets 75g Media sizes A4 A5 A6 Letter Legal Oficio Folio Executive ISO B5 JIS B5 3 x5
79. e M Support 4 E ring Bearing Shaft Pickup Roller Ass y Service Manual Samsung Electronics Disassembly and Reassembly 11 Remove the Roller Unit as shown below Roller Unit EJ Service Manual Samsung Electronics Disassembly and Reassembly 5 27 Engine Shield 1 Remove the Guide P Front Refer to the 5 16 7 4 Unplug the all Connectors from the Engine PBA 2 Remove six screws and slightly lift the Engine Shield as shown below Engine Shiel Ass y 5 Remove four screws and take out the Engine PBA out of the Shield Engine PBA D Guide Duplex R Shield Service Manual EJ Samsung Electronics Troubleshooting 6 Troubleshooting 6 1 Procedure of Checking the Symptoms Before attempting to repair the printer first obtain a detailed description of the problem from the customer Power On No Power OP Panel No Power Module error ON Main PBA error LCD Panel error Yes Ready or No Indicate Yes Refer to Power save a Error Massage Error Massage lt Chapter 4 5 gt Yes No Y Y rintin NATIN c Refer to Solution Nomal of Image Problem Yes END Service Manual KI Samsung Electronics Troubleshooting 6 2 The cause and solution of Bad image 6 2 1 Vertical Black Lin
80. e and Band Description 1 Straight thin black vertical line occurs in the printing p 2 Dark black vertical band occur in the printing Check and Cause Solution Digital Pginter 1 Deformed Doctor blade or cleaning blade 1 If causes 1 and 2 occur in the print Digital Pinter ae I in print cartridge cartridge replace the print cartridge and Digital Pllinter try to print out Digital Digital 2 Scratched surface of the charge roller 2 Replace the transfer roller if occurred as the print cartridge No 3 3 Partly depression or deformation on the surface of the transfer roller 6 2 2 Vertical White Line L Description White vertical voids in the image Check and Cause Solution Digital Printer Digital Printer 1 Foreign matter stuck onto the window of 1 Foreign matter stuck onto the window Bad internal lenses of LSU mirror Clean the LSU window with recommend Digita Printer ed cleaner IPA Clean the window with a Digital Printer clean cotton swab Digital Printer 2 Foreign matter or toner particles between 2 Replace the print cartridge the print cartridge roller and blade In case the life of the print cartridge has been expired white lines or light image occur in front of the image 3 It may occur when Burr and foreign 3 No 3 Remove the foreign matter and substances are on the window of the b
81. e electric shock Do not allow paper clips pins or other foreign objects to fall into the printer these could cause a short circuit leading to an electric shock or fire hazard 5 Never touch the plugs on either end of the power cable with wet hands this can cause electric shock When servicing the printer remove the power plug from the wall socket 6 Use caution when inserting or removing the power connector The power connector must be inserted com pletely otherwise a poor contact could cause overheating possibly leading to a fire When removing the power connector grip it firmly and pull 7 Take care of the power cable Do not allow it to become twisted bent sharply round corners or other wise damaged Do not place objects on top of the power cable If the power cable is damaged it could overheat and cause a fire or exposed cables could cause an electric shock Replace a damaged power cable immediately do not reuse or repair the damaged cable Some chemicals can attack the coating on the power cable weakening the cover or exposing cables causing fire and shock risks 8 Ensure that the power sockets and plugs are not cracked or broken in any way Any such defects should be repaired immediately Take care not to cut or damage the power cable or plugs when moving the machine 9 Use caution during thunder or lightening storms Samsung recommends that this machine be disconnected from the power source when such weather conditions are expe
82. e rollers in the print cartridge may Digital Printer be contaminated with foreign matte or Digital Printer paper particles Digital Printer Charge roller 38 mm interval ee gat OPC drum 95 mm interval 2 If faded areas or voids occur in a black image at intervals of 95 mm or black spots occur elsewhere the OPC drum surface is damaged 3 If a black image is partially broken the transfer voltage is abnormal or the trans fer roller s life has expired 1 Run OPC cleaning Mode Self test 2 or 3 times 2 In case of 95 mm interval Print and run the unremovable in 1 cleanly remove foreign substances stuck on the OPC location equivalent to black spots and white spots with a dry duster 3 The transfer roller guarantees 150 000 sheets printing in normal environment If the roller s life is expired replace it 4 In case of 38 mm interval unremovable in 1 take measures as to replace the print cartridge and try to print out 5 Clean the inside of the set against the paper particles and foreign matter in order not to cause the trouble Samsung Electronics Service Manual LJ Troubleshooting 6 2 5 Light Image L Description The printed image is light with no ghost Check and Cause Solution 1 Develop roller is stained when the toner of print cartridge is almost consumed 2 Ambient temperature is below than 10 C 3 Bad contact caused by the t
83. e state of paper to CPU whether it is empty or not with operation of the actuator When cassette is empty it detects the fact by reading the D0 Bit of CPU and then informs the fact by selecting the sec ond LED yellow among the panel LEDs 3 3 1 5 2 MP Sensing By operation of Actuator on the frame MP Sensor Photo interruptor on the engine board informs the state of paper to CPU whether it is empty or not It reads the DO Bit of CPU for recognizing paper in MP and paper is fed from MP if there is 3 3 1 5 3 Paper Feeding Width Toner Cartridge Sensing When paper passes the actuator feed sensor part it detects the signal of Photo interrupter informs the paper feeding state to CPU and then sprays the image data after certain time If it doesn t detect the feed sensor within 1sec after paper is fed paper Jam0 CPU _ is occurred Red and Yellow will be turned on among the OP panel LEDs and the fact whether the developer is inserted or not is detected with the same principle After the developer is mounted the actuator is operated The signal from the photo interrupter is detected when it is passing the actuator of the sensor part That is the developer ID sensing 3 3 1 5 4 Paper Exit Sensing It detects paper state whether paper gets out from the set with operation of exit sensor on the engine board and actuator on the frame Paper detects the on off time of exit sensor by reading D2 Bit of CPU and the normal operation or jam i
84. e storage To get the most from the toner cartridge keep the following guidelines in mind Do not remove the toner cartridge from its package until ready for use Do not refill the toner cartridge The printer warranty does not cover damage caused by using a refilled cartridge Store toner cartridge in the same environment as the printer To prevent damage to the toner cartridge do not expose it to light for more than a few minute Expected cartridge life The life of the toner cartridge depends on the amount of toner that print jobs require When printing text at ISO 19752 5 coverage a new toner cartridge lasts an average of either 20 000 or 10 000 pages The original toner cartridge sup plied with the printer lasts an average of 10 000 pages The actual number may also be different depending on the print density of the pages you print on and the number of pages may be affected by operating environment printing interval media type and media size If you print a lot of graphics you may need to change the cartridge more often Saving toner To save toner press Toner Save on the control panel The button backlight turns on Using this feature extends the life of the toner cartridge and reduce your cost per page but it also reduces print quality 6 5 1 Checking the remaining toner You can check the level of toner left in the cartridge If you are having print quality problems this can help you determine if the problem is caused by low
85. ed 11 1 Tool for Troubleshooting The following tools are recommended safe and easy troubleshooting as described in this service manual DVM Digital Volt Meter Standard Indicates more than 3 digits Driver Standard type type M3 long M3 short M2 long M2 short Tweezers Standard For general home use small type e Cotton Swab Standard For general home use for medical service e Cleaning Equipments Standard An IPA Isopropyl Alcohol dry wipe tissue or a gentle neutral detergent and lint free cloth e Vacuum Cleaner Samsung Electronics Service Manual E Reference Information 11 2 Acronyms and Abbreviations 1 The table below explains the abbreviations and acronyms used in this service manual Where abbreviations or acronyms are used in the text please refer to this table Abbreviations AP AC APC ASIC ASSY BIOS BLDC CMOS CN CON CPU dB dBA dBM DC DCU DPI DRAM DVM ECP EDC EEPROM EMI EP EPP FPOT F W GDI GND HBP HDD H H HV HVPS I F 1 0 IC IDE Explanation Access Point Alternating Current Auto Power Control Application Specific Integrated Circuit assembly Basic Input Output System Brush less Direct Current Complementary Metal Oxide Semiconductor connector connector Central Processing Unit decibel decibel A decibel milliwatt direct current Diagnostic Control Unit Dot Per I
86. ed tip soldering iron to solder or desolder ESDs 4 Use only an anti static solder removal device Some solder removal devices not classified as anti static can generate electrical charges sufficient to damage ESDs 5 Do not use Freon propelled chemicals When sprayed these can generate electrical charges sufficient to dam age ESDs 6 Do not remove a replacement ESD from its protective packaging until immediately before installing it Most replacement ESDs are packaged with all leads shorted together by conductive foam aluminum foil or a compa rable conductive material 7 Immediately before removing the protective shorting material from the leads of a replacement ESD touch the pro tective material to the chassis or circuit assembly into which the device will be installed 8 Maintain continuous electrical contact between the ESD and the assembly into which it will be installed until com pletely plugged or soldered into the circuit 9 Minimize bodily motions when handling unpackaged replacement ESDs Normal motions such as the brushing together of clothing fabric and lifting one s foot from a carpeted floor can generate static electricity sufficient to damage an ESD Service Manual KI Samsung Electronics 2 Product Specifications 2 1 Product Overview Specifications Item Descriptions Remark Basic Model ML 4550 Series Model ML 4550 ML 4551N ML 4551ND ML 4551NDG Kor Maket of Sailes Office user
87. eed sensor the paper cannot reach the exit sen sor after certain time The exit sensor cannot be ON The paper exists between the feed sensor and the exit sensor JAM 2 After the trailing edge of the paper passes the feed sensor the paper cannot pass the exit sensor after certain time DUPLEX After the trailing edge of the paper passes the exit sensor the leading edge of the paper cannot JAM 1 reach the duplex sensor after certain time DUPLEX After the leading edge of the paper passes the duplex sensor the leading edge of the paper can JAM 0 not reach the feed sensor after certain time 3 3 3 1 2 Driver By gearing the main motor drives the rollers such as feeding roller developing roller fuser roller and exiting roller The step motor is controlled for the such acceleration section and steady section In the initial stage of the motor run appoint the acceleration section to prevent the step out of the motor It is controlled by the A 3977 motor dri ver IC The step signal and the enable signal are sent to make the phase for driving the motor in CPU 3 3 3 1 3 Transfer The charging voltage developing voltage and the transfer voltage are controlled by PWM Pulse Width Modulation The each output voltage is changeable due to the PWM duty The transfer voltage admitted when the paper passes the transfer roller is decided by environment recognition The resistance value of the transfer roller is changed due to t
88. elillum Dolore eu zril feugiat nulla facilisis at vero eros accumsan et iusto odio dignissim qui blandit praesent Singabet Stephen J Singel Demperta Aminerimum Labanda Sinpat Abarress JS dwg 2 8 n 4 lt gt lt lt 5 pa oo gt 2 Z m i Q ES z Z Ss SPINAL 5 Z ise n gt lt lt N gt o a a gt Q a 8 Stnecrep Balrecneps a 4 iS lt lt N Ww e gt Q g kj Q lt 2 o 8 n 4 lt x lt N 3 lt x lt N YZ MNOPQRSTUVWX KL MNOPORSTUVWXYZ0123456789ABCDEFGHD KL BCDEFGHIJ Samsung Electronics Service Manual EU Reference Information 11 6 11 5 LAN Optional Function This product be used with a wired LAN Option LED Condition and Status 9 Q Service Manual Antenna connector RJ 45 Jack Active LED Green Link LED Red Green Orange LED STATUS LED Condition Status Active LED random blink Normal NPC amp Normal packet receive Active LED regular blink Normal NPC amp No Packet Active LED Off On maintenance NPC Initial inferiority Link LED On The link LED On OPC Normally linked Red Wireless Green Wire Orange Wire Link LED Off Link LED off NPC L
89. elow remove Top Cover Refer to the 5 15 2 Unplug the Harness and remove four screws as shown below e FCR la ag 44 5 Unplug the Harness remove the screw and take out 6 the PTL PBA PTL Upper 3 Release the lock as shown below and lift up the Gear Terminal Cap y gt PTL PBA Service Manual EJ Samsung Electronics Disassembly and Reassembly 5 25 MP Pick Up Ass y 1 Before you remove the MP Pick Up Ass y you should 4 Remove the screw securing the Bracket and remove remove below MPFAss y Refer to the5 3 TIL Main Drive Ass y Refer to the 5 9 Top Cover Refer to the 5 15 Inner Cover Refer to the 5 17 N First of all remove two screws Lift up the MP Pick Up Shaft for taking out the MP Pick Up Rack SLES SIA lt 4 NI MP Pick Up Rack gt lt M f rs 47 Gear ass y Bearing 5 Slide the Cam to the right by pulling on the MP Pick Up Shaft as shown below 3 Remove the locking equipment rotate the Bearing in the direction of arrow Idle Cam Bearing Service Manual Samsung Electronics Disassembly and Reassembly 6 First lift the left side of the Shaft and then
90. er touching the sensor T4 Psize2 Sen T4 Psize2 Sen Low High TOP Margin Sen See the message after touching the sensor TOP Margin Sen TOP Margin Sen Without Paper With Paper DPX Detect Sen See the message after touching the sensor DPX Detect Sen DPX Detect Sen Low High The procedure and content above can be changed according to the situation 4 4 Service Manual Samsung Electronics Alignment amp Adjustments 4 1 5 Motor Test These functions are to check a current state normal or not of all motors Usage 1 Press the Arrow Keys 4 until finding Component Test 3 Motor Test message on the panel 2 Press the OK Key when it is found 3 Press the Arrow keys until finding a suitable function Refer to the table below 4 Press the OK Key when it is found 5 Press the OK Key for execution or the Back key for return Function Function Name Description Display LCD Main Mtr Fwd The motor will run on the forward direction or stop Main Mtr Fwd ON OFF Main Mtr Bwd The motor will run on the backward direction or stop Main Mtr Bwd ON OFF Main Mtr Slow The motor will run on the forwarding direction by half speed Main Mtr Slow ON OFF Dev Mtr Nor The motor will run on the forwarding direction by normal speed Dev Mtr Slow ON OFF Dev Mtr Slow The motor wi
91. es it takes assembly part of the actuator exit or longer hour than it should and does not and if the actuator is smoothly not return operated Check if foreign matter and wire get caught in the actuator exit s operation 2 If the paper is rolled in the Fuser Roller 2 If the paper is stuck in the fuser dis This occurs when a Guide claw is assemble the fuser and remove the broken away or transformed jammed paper and clean the surface e t occurs when the Spring of a Guide of the pressure roller with dry gauze claw is broken away or transformed It occurs when the Heat Roller or Pressure Roller is seriously contami nated with the toner 3 Paper is accordion in the fuser 3 Remove the jammed paper after disas sembling the fuser Clean the surface of the pressure roller with dry gauze Remove the toner particles stained on the rib Check the assemblage and perfor mance of the exit Service Manual Samsung Electronics Troubleshooting 6 3 5 Duplex Jam 1 Description message Duplex Jam 1 is displayed in a LCD window Check and Cause Solution 6 3 6 Duplex Jam 0 It is case when a paper can not operate a duplex sensor 2 It is a case when a paper can not reach to a duplex sensor due to a paper jam on a duplex path 1 Replace a SMPS or main PBA 2 A case that a paper jam occurs on A after it is reversed replace a 2nd exit
92. fer roller transfers toner on an OPC drum to the paper Life span Print over 150 000 sheets In 16 27 3 2 3 Driver Ass y By driving the motor the system takes power It consists of a main motor for feeding fuser and duplex reverse turn and a deve motor for a toner cartridge Main Motor DC 24V Rated RPM 1604rpm Deve Motor DC 24V Rated RPM 1424 rpm 3 2 4 Fuser It is consisted of a heat lamp heat roller pressure roller thermistor and thermostat It sticks the toner on a paper by heat and pressure to complete the printing job E coil Heator 1 300 Watt 50W 1 Thermostat When a heat lamp is overheated a Thermostat cuts off the main power to prevent over heating Non Cotact type Thermostat 3 Heat roller The heat roller transfers the heat from the e coil to apply a heat on the paper The surface of a heat roller is coated with Teflon so toner does not stick to the surface 4 Pressure roller A pressure roller mounted under a heat roller is made of a silicon resin and the surface also is coated with Teflon When a paper passes between a heat roller and a pressure roller toner adheres to the surface of a paper permanently 5 Items for safety Protecting device for overheating 1st protection device Hardware cuts off when overheated 2nd protection device Software cuts off when overheated 3rd protection device Thermostat cuts off main power Safety device A fuser power is cut off when a fr
93. g 6 2 7 Uneven Density L Description Print density is uneven between left and right Diqit Check and Cause Solution igita 9 1 pressure force left right 1 Replace both the left right Spring Digita springs of the transfer roller is not even Holder Digita the springs are damaged the transfer Digita roller is improperly installed or the trans Digita fer roller bushing or holder is damaged 2 The life of the print cartridge has expired 2 Occur in the print cartridge gently shake the print cartridge 3 The toner level is not even on the print 3 Replace the print cartridge and try to print cartridge roller due to the bad blade out 6 2 8 Background Description Light dark background appears whole area of the printing ae Check and Cause Solution Digital Printer Diqital Printer 1 Does character exist less than 2 1 The print cartridge is basically igi i coverage per a page and hasn t it designed to print 20 000 pages with Digital been used long time 5 coverage If it prints more than Digital Printer see the configuration sheet 23 000 pages with 296 coverage a Digital Printer background can occur 2 The A S is not guaranteed if using a 2 Is a recycled print cartridge be used recyled the print cartridger 3 Has the life span of the print cartridge ended 3 Replace the print cartridge when the life span of it has
94. ge indicating the corresponding location of the paper jam appears Refer to the table below to locate the paper jam and to clear it 4 2 1 1 In the paper feed area In the Tray1 1 Pull the tray 1 open 2 Remove the jammed paper by gently pulling it straight out Make sure that all of the paper is properly aligned in the tray 1 If the paper does not move when you pull or if you do not see the paper in this area check the fuser area around the toner cartridge 3 Insert the tray 1 into the printer until it snaps into place Printing automatically resumes Service Manual Samsung Electronics Alignment amp Adjustments In the optional tray 1 Pull the optional tray open 3 Pull the upper tray half way out 2 Remove the jammed paper from the printer 4 Pull the jammed paper straight up and out If the paper does not move when you pull or if you do not see the paper in this area stop and go to step 3 5 Fully insert the trays back into the printer Printing automatically resumes In the multi purpose tray 1 If the paper is not feeding properly pull the paper out of the printer 2 Open and close the top cover to resume printing 3 Open and close the top cover Printing can be resumed Service Manual ng Samsung Electronics Alignment amp Adjustments 4 2 1 2 Around the printer c
95. ght to remove it form the cartridge Be care ful not to cut the tape If this happens you can not use the toner cartridge Refer to the helpful pictures on the cartridge wrapping paper 5 Remove the flexible plastic holder out of the toner cartridge Caution Do not use sharp objects such as a knife or scissors to open the toner cartridge package They might scratch the drum of the cartridge ma Manual Samsung Electronics Troubleshooting 6 Thoroughly shake the cartridge 5 or 6 times to distrib Caution If toner gets on your clothing wipe it off with ute the toner evenly inside the cartridge a dry cloth and wash clothing in cold water Hot water sets toner into fabric To prevent damage to the toner cartridge do not expose it to light for more than a few minutes Cover it with a piece of paper if necessary Do not touch the green surface underside of the toner cartridge Use the handle on the cartridge to avoid touching this area T Hold the toner cartridge by the handle and slowly insert the cartridge into the opening in the printer Thoroughly roll the cartridge to assure maximum Tabs on the sides of the cartridge and corresponding copies per cartridge Save the box and the plastic bag grooves within the printer will guide the cartridge into for shipping the correct position until it locks into place completely 8 Close the top
96. he surrounding environment or the environment of the set and the voltage value which changes due to the environments is changed through AD converter The voltage value for impressing to the trans fer roller is decided by the changed value Each voltage value is controlled according to 3 3 4 2 Timing Chart EJ Service Manual Samsung Electronics Summary of Product 3 3 3 1 4 Fusing The temperature change of the heat roller s surface is changed to the resistance value through the thermistor By converting the voltage value which impressed to the resistance to the digital value through the AD converter the temperature is decided The AC power is controller by comparing the target temperature to the value from the thermistor If the value from the thermistor is out of controlling range while controlling the fusing the error stated in the below table occurs Lamp Method Error Description LCD Display OPEN HEAT ERROR When warming up it has been lower than 60 C ENGINE FUSER ERROR over 35 seconds LOW HEAT ERROR Standbylt has been lower than 130 over 10 seconds ENGINE LOW HEAT ERROR Printing Up to 2 consecutive pages It has been lower than 155 c over 7 seconds From 3 consecutive pages It has been 25 c lower than the fixed fusing temperature over 7 seconds OVER HEAT ERROR It has been higher than 230 C over 10 seconds ENGINE OVERHEAT ERROR gt This can be changed in the future 3 3
97. heck the level of toner left in the cartridge If you are having print quality problems this can help you determine if the problem is caused by low toner Following the key formation at the panel note the toner remaining level on the cartridge information after taking out the configuration sheet In other way to check follow the TECH mode and out put the cartridge information The display shows the percentage of the remaining toner 1 Service Manual Samsung Electronics Troubleshooting 6 5 2 Redistributing toner cartridge When the toner cartridge is near the end of its life White streaks and light printing occur Toner Low appears on the display The Smart Panel program window appears on the computer telling you that the toner level is low The Status LED blinks red If this happens you can temporarily reestablish print quality by redistributing the remaining toner in the cartridge In some cases white streaks or light printing will still occur even after you have redistributed the toner 1 Open the top cover 2 Pull the toner cartridge out Caution Avoid reaching too far into the printer The fusing area may be hot To prevent damage to the toner cartridge do not expose it to light for more than a few minutes Cover it with a piece of paper if necessary Do not touch the green surface underside of the toner cartridge Use the handle on the cartridge to avoid touching this area
98. ink Inferiority Samsung Electronics ELECTRONICS This service manual is a property of Samsung Electronics Co Ltd Samsung Electronics Co Ltd Mar 2006 Any unauthorized use of Manual can be punished under applicable Printed in Korea international and or domestic law VERSION NO 1 00 CODE JC 0168R
99. ion of the actuator of the paper sen 1 Replace the defective actuator Sor 2 The function of the engine board is defective 2 Replace the empty sensor PBA 3 Check the connector and harness Service Manual CO Samsung Electronics Troubleshooting 6 4 5 Paper Empty without indication Description A message Paper Empty is displayed in a LCD panel The paper lamp on the operator panel does not come on when the paper cassette is empty Check and Cause Solution 1 Bending or deformation of the actuator of the paper sen sor 2 Check the Main board 3 Check the empty sensor board 4 Check the toner sensor board 6 4 6 Cover Open 1 Replace the defective actuator 2 Replace the board which has a trouble Description message Colse Top Cover is displayed in a LCD panel The ERROR lamp is on even when the print cover is closed Check and Cause Solution 1 The hook lever in the top cover may be defective 2 Check the main board 3 Check the cover open board 4 Check the harness and connection 1 Replace the hook lever if defective 2 Check the insertion of the cover open S W connect 3 Replace the main board or cover open board Service Manual Samsung Electronics Troubleshooting 6 4 7 No error message when the cover is open e Description The ERROR message does not come on even when the printer cover is open
100. ithin 1 min at 1500Vac 10mA Leaking Current under 3 5mA Running Current under 40A PEAK AT 25 COLD START under 60A PEAK In other conditions Rising Time within 2Sec Falling Time over 20ms Surge Ring Wave 6KV 500A Normal Common Environment Condition Operating temperature range 9c 40 C Maintaining temperature range 25 85 c Preserving Humidity Condition 30 90 RH Operating atmospheric pressure range 3 3 2 3 FUSER AC POWER CONTROL Fuser HEAT LAMP gets heat from AC power The AV power controls the switch with the Triac a semiconductor switch The ON OFF control is operated when the gate of the Triac is turned on off by Photo triac insulting part In other words the AC control part is passive circuit so it tums the heater on off with taking signal from engine control part When the HEATER ON Signal is turned on at engine the LED of PC1 Photo Triac takes the voltage and flashes From the flashing light the Triac part light receiving part takes the voltage and the voltage is supplied to the gate of Triac and flows into the Triac As a result the AC current flows in the heat lamp and heat is occurred On the other hand when the signal is off the PC1 is off the voltage is cut off at the gate of Triac the Triac becomes off and then the heat lamp is turned off Triac THY1 feature 12A 600V SWITCHING Phototriac Coupler PC3 Turn On If Current 15mA 50mA Desig
101. k page is printed Description 2 One or several blank pages are printed 3 When the printer turns on several blank pages print Check and Cause Solution 1 Bad ground contacts in OPC and or print 1 Remove contamination of the terminals of cartridge the print cartridge 2 Abnormal solenoid 2 Perform the engine self test using EDC Mode to check if the Solenoid is normal 3 If not solved by the above directions 1 2 Replace the engine board 4 Turn the power off delete the data of PC and try printing again KI Service Manual Samsung Electronics Troubleshooting 6 3 The cause and solution of the bad discharge 6 3 1 Wrong Print Position t Description Printing begins at wrong position on the paper J Check and Cause Solution Wrong sense time caused by defective feed sensor Replace the defective actuator actuator 6 3 2 JAM 0 Description 1 Paper is not exited from the cassette p 2 Jam 0 occurs if the paper feeds into the printer Check and Cause Solution 1 Check the Main clutch by using EDC 1 Replace the Main clutch Mode 2 Check if the pad is loose due to bad 2 Replace the side pad Assembly L or sealing of the side pad R if necessary 3 Check the surface of the roller pick up for foreign matter 3 Clean with soft cloth dampened with IPA Isopropyl Alcohol or water 4 If continuous clusters occu
102. ler is stained when the toner of print cartridge is almost consumed 2 Ambient temperature is below than 10 C 3 Bad contact caused by the toner stains between the high voltage terminal in the HVPS and the one in the set 4 Abnormal output from the HVPS Run self test and check 1 4 5 Check warranty out 6 2 6 Dark Image or a Black Page 1 Check if the Toner Save mode is off Check if the density is light 2 No 1 Replace the print cartridge and try to print out 3 No 2 Wait 30 minutes after printer is pow ered on before you start printing 4 No3 Clean up the contaminated area by the toner 5 Replace the HVPS if the problems are not solved by the above four instructions 6 Replace print cartridge Description The printed image is dark Check and Cause Solution 1 No charge voltage in the engine board 2 Charge voltage is not turned on due to the bad contacts between power supply in the side of the print cartridge and charge terminal of HVPS 3 VD0 signal of the Main PBA is Low state 4 Case back side the cleaning blade of print cartridge 1 Check the state of the connector which connects the engine board and HVPS 2 Clean the high voltage charge terminal 3 Replace the HVPS if not solved by the above direction 1 and 2 4 Replace the LSU Unit or Main PBA 5 Replace print cartridge Service Manual Samsung Electronics Troubleshootin
103. ll run on the forwarding direction by half speed Dev Mtr Slow ON OFF Duplex Mtr Fwd The motor will run on the forwarding direction Duplex Mtr Fwd ON OFF T2 Feed Motor The motor will run on the forward direction or stop T2 Feed Motor ON OFF T3 Feed Motor The motor will run on the forward direction or stop T3 Feed Motor ON OFF T4 Feed Motor The tray2 motor will run on the forward direction or stop T Feed Motor ON OFF The procedure and content above can be changed according to the situation 4 1 6 Fan Test These functions are to check a current state normal or not of all fans Usage 1 Press the Arrow Keys 4 until finding Component Test 4 Fan Test message on the panel 2 Press the OK Key when it is found 3 Press the Arrow keys until finding a suitable function Refer to the table below 4 Press the OK Key when it is found 5 Press the OK Key for execution or the Back key for return Service Manual a 4 5 Samsung Electronics Alignment amp Adjustments Function Function Name Description Display LCD Fuser Fan The fan will run or stop Fuser Fan ON OFF Fuser Fan Rdy Check whether the fan is in locked state Fuser Fan Rdy Ready Not Ready SMPS Fan The fan will run or stop SMPS Fan ON OFF SMPS Fan Rdy Check whether the fan is in locked state SMPS Fan Ray Ready Not Ready Duplex Fan
104. m on the back of a paper Solution Check and Cause 1 Contamination of the pressure roller or heat roller Background Hot off set 2 Check the claw of the fuser whether it is deformed After disassembling the fuser clean contami nation between the heat roller and the ther mostor and remove the contamination of the pressure roller N If there is heavy background repair it by the background troubleshooting method 3 Clean the surface of the heat roller with IPA or water 4 Check the warp or separation of the print claw and the holder plate claw and then manage it Service Manual Samsung Electronics Troubleshooting 6 3 9 Paper rolled on the OPC Drum Description Paper is rolled up in the OPC Check and Cause Solution 1 Paper is too much thin 2 The face of paper is curled 1 Recommend to use normal paper 2 How to remove the rolled paper in the OPC Remove the paper while turning the OPC against the ongoing direction Clean fingerprints on the OPC softly with soft cloth dampened with tissue Samsung Electronics Service Manual ng Troubleshooting 6 4 The cause and solution of the malfunction 6 4 1 Fuser Error Description panel A message Engine Fuser Low Heat Error Engine Fuser Over Heat Error is displayed in a LCD Check and Cause Solution Check whether a thermostat open or not
105. me problems detected Sleeping The printer is in power save mode When data is received it switches to on line automatically Service Manual Samsung Electronics Alignment amp Adjustments Message Meaning Suggested solutions Toner Emhaust The life of the toner cartridge in end Replace the toner cartridge with a new one Toner Low The displayed toner cartridge is almost Take out the toner cartridge and empty thoroughly shake it By doing this you can temporarily reestablish printing operations Tray The displayed tray is open Close the tray until it locks into place Cassette Out Tray There is no paper in the tray Load paper in the tray Paper Empty Warming Up Your printer is warming up now Please wait a few minutes Please Wait Samsung Electronics Service Manual Disassembly and Reassembly 5 Disassembly and Reassembly 5 1 General Precautions on Disassembly When you disassemble and reassemble compo nents you must use extreme caution The close proximity of cables to moving parts makes proper routing a must If components are removed any cables disturbed by the procedure must be restored as close as possible to their original positions Before remov ing any component from the machine note the cable routing that will be affected Whenever servicing the machine you must perform as follows 1 Check to verify that document
106. n T3 Version This is the version for Tray3 T3 Version x xx is version T4 Version This is the version for Tray4 T4 Version x xx X XX is version Duplex Version This is the version for Duplex Duplex Version x xx xxx is version The procedure and content above can be changed according to the situation Service Manual a 4 9 Samsung Electronics Alignment amp Adjustments 4 2 Paper Path Cassette Duplex MPF Print Cartridge e LSU Fuser SMPS 8 HVPS Board Duplex Solenoid lt Jam 05 Jam 1 Service Manual Samsung Electronics Alignment amp Adjustments lt Jam 2 gt lt Jam Duplex 1 gt lt Jam Duplex 0 gt Simplex 1 A paper is fed from a cassette or MPF by a printing order 2 The fed paper passes a paper feeding sensor If the sensor does not operate after feeding the paper the Jam0 occurs 3 The paper passes a paper exit sensor and it comes out from a machine If the tailing edge of the paper does not come out from a machine after the leading edge of the paper passes the sensor then certain time later a Jam2 occurs Duplex 1 A paper is fad from a cassette or MPF by a printing order 2 The fed paper passes a paper feeding sensor If the sensor does not operate after feeding the paper a Jam0
107. n 16mA High Repetive Peak Off State Voltage Min 600V Service Manual EJ Samsung Electronics Summary of Product 3 3 3 Engine FIW 3 3 3 1 Control Algorithm Feeding If feeding from a cassette the drive of the pickup roller is controlled by controlling the solenoid The on off of the solenoid is controlled by controlling the general output port or the external output port If feeding from a manual feeder decide to insert the paper according to the operation of the manual sensor and by driving the main motor insert the paper in front of the feed sensor While paper moves occurrence of Jam is judged as below ITEM Description After picking up paper cannot be entered due to paper is not fed After picking up paper entered but it cannot reach to the feed sensor in certain time due to slip etc After picking up if the feed sensor is not on re pick up After re picking up if the feed sensor is JAM 0 not on after certain time it is JAM 0 tis a status that the leading edge of the paper doesn t pass the feed sensor Even though the paper reaches to the feed sensor the feed sensor doesn t be ON It is a status that the leading edge of the paper already passes the feed sensor After the leading edge of the paper passes the feed sensor the trailing edge of the paper cannot pass the feed sensor after a certain time The feed sensor cannot be OFF JAM 1 After the leading edge of the paper passes the f
108. nch Dynamic Random Access Memory Digital Voltmeter Enhanced Capability Port Embedded Diagnostic control Electronically Erasable Programmable Read Only Memory Electro Magnetic Interference electrophotographic Enhanced Parallel Port First Printout Time firmware graphics device interface ground Host Based Printing Hard Disk Drive High temperature and high marshy place high voltage High Voltage Power Supply interface Input and Output integrated circuit Intelligent Drive electronics or Imbedded Drive Electronics Service Manual Samsung Electronics Reference Information Acronyms and Abbreviations 2 Abbreviations Explanation IEEE Institute of Electrical and Electronics Engineers Inc IPA Isopropy Alcohol IPM Images Per Minute LAN local area network Ib pound s LBP Laser Beam Printer LCD Liquid Crystal Display LED Light Emitting Diode L L Low temperature and low marshy place LSU Laser Scanning Unit MB megabyte MHz megahertz MPF Multi Purpose Feeder NIC Network Interface Card N N Normal temperature and normal marshy place NVRAM nonvolatile random access memory OPC Organic Photo Conductor OP Operation Panel Equipment PBA Printed Board Assembly PCL Printer Command Language Printer Control Language PDL Page Discription Language PPM Page Per Minute PPS Pulse Per Second PS Post Script PTL Pre Transfer Lamp PWM Pulse Width Modulation Q PID Quick Printer Initiating Device Q t
109. ner cartridge Toner Exhausted Replace Toner The lifespan of the toner cartridge is reached This message appears when you selected Continue at the Toner Exhausted prompt Install the genuine toner cartridge Service Manual Samsung Electronics Troubleshooting 6 6 The cause and solutions of bad environment of the software 6 6 1 The printer is not working 1 Description While Power turned on the printer is not working the printing mode Check and Cause Solution 1 Run Self Test Mode Turn the power on while pressing the test printing button for 2 or 3 seconds before printing works 2 Check if the PC and the printer is properly connected and the print cartridge installed 3 Printing is nor working in the Windows 4 Check if the printer cable is directly connected to periph eral devices 1 Check the power of the printer and perform the Self Test If the test printing works that means no prob lems in the printer itself If the test printing does not work that means bad functioning of the printer not because of software 2 Replace the printer cable If the problems not solved even after the cable replaced check the amount of the remaining tone refer to print cartridge Service 4 5 Check if the connection between printer port is proper If you use windows check if the printer dri ver in the controller is set up If the printer driver is p
110. nformation is informed to the CPU The paper JAM2 is informed Red Yellow LED will be turned on among the OP panel LEDs 3 3 1 5 5 Cover Open Sensing The Cover open sensor is located on the front cover After the front cover is opened 24V DC fan Solenoid Main Motor Polygon motor part of LSU and HVPS which is supplied to the each unit is cut off The cover open sensing is operated by the DO bit of CPU and the developer ID sensing is operated by D7 bit of CPU In case the red LED among OP pnael LEDs will be ON for informing the facts to user 3 3 1 5 6 DC FAN SOLENOID Driving It is driven by transistor and controlled by D6 bit of CPU When it is high the fan is driving by turning on the TR and it is off when the sleep mode is selected There are two sole noids and they are driven by paper pick up and MP signal It is tumed on or off by D4 bit of CPU and its driving time is 300ms The diode protects the driving TR from the noise pulse which is flown when the solenoid id de energizing FAN Driving Circuit is driven by Transistor and controlled by D6 Bit of 3 3 1 5 7 Motor Driving The motor driving circuit is formed when the Driver IC is selected in the first place The A3977 Motor Driver IC is used in this case But resistance Rs value of sensing and voltage value of the V reference can be changed by motor driving volt age value The motor driving voltage is calculated with the following formula Vref Rs wherein V
111. nformation page then press the Enter button to print f installed The HDD select press 1 3 times then display intormation menu Note Print the Menu Map to see other information pages available for printing 4 3 2 Demo Pages Your printer comes with a set of sample pages which demonstrate different functions To print sample pages 1 On the printer s front panel press the Menu button then press the OK button to select Information 2 Select Demo Pages then press the OK button 3 Select the desired sample page then press the OK button to print Service Manual 4 17 Samsung Electronics Alignment amp Adjustments 4 4 Periodic Defective Image If the delinquent image regularly occurs in the printed paper it is due to delinquent or damaged roller Refer to the table in below and check the condition of the roller No Roller Defective image Typical defect 1 OPC Drum 95 mm white spot on black image or black spot image ghost 2 Charge Roller 38 mm black spot 3 Supply Roller 45 mm light or dark horizontal image band 4 Developing Roller 43 mm horizontal image band image ghost 5 Transfer Roller 55 mm image ghost 6 Heat Roller 126 mm Black spot and image ghost 7 Pressure Roller 126 mm black spot on the backside Drum Transfer Roller A Charge Roller Heat Roller fi Supply Roller Pressure Roller Developing Roller lt Rollers Layout gt
112. ng If it is not working in a certain program adjust the setup the program requires Sometimes the printout is normal within the Windows basic programs but it s not work ing in a particular program In such case install the new driver again If not working in the Windows basic program Check the setup of the port of CMOS is on ECP And check the address of IRQ 7 and 378 4 If the scanner needs to be connected to the printer first the remove the scanner from the PC to see if the printer is properly working alone Samsung Electronics Service Manual CI Troubleshooting 6 6 2 The printer is not working 2 Description After receiving the printing order no response at all or the low speed of printing occurs due to wrong setup of the environment rather than malfunction of the printer itself Check and Cause Solution Secure more space of the hard disk 2 Printing error occurs even if there is enough space in the hard disk 3 Check the parallel port related items in the CMOS Setup 4 Reboot the system to print 1 Not working with the message insufficient printer memory means hard disk space problem rather than the RAM problem In this case provide more space for the hard disk Secure more space using the disk utilities program N The connection of the cable and printer port is not proper Check if the connection is properly done and if the parallel port in CMOS is rightly
113. ng RegiSensor See the message after touching the sensor Regi Sensor Regi Sensor Without Paper With Paper T1FeedSensor See the message after touching the sensor T1 Feed Sensor T1 Feed Sensor Without Paper With Paper T2 FeedSensor See the message after touching the sensor T2 Feed Sensor T2 Feed Sensor Without Paper With Paper T3 FeedSensor See the message after touching the sensor T3 Feed Sensor T3 Feed Sensor Without Paper With Paper T4 FeedSensor See the message after touching the sensor T4 Feed Sensor T4 Feed Sensor Without Paper With Paper ExitSensor See the message after touching the sensor Exit Sensor Exit Sensor Without Paper With Paper DJam1Sensor See the message after touching the sensor DJam1 Sensor Djam1 Sensor Without Paper With Paper Out Bin Sensor See the message after touching the sensor OutBin Sensor OutBin Sensor Normal Full Bypass Empty See the message after touching the sensor Bypass Empty Bypass Empty Empty Present T1 Paper Empty See the message after touching the sensor T1 Paper Empty T1 Paper Empty Empty Present T2 Paper Empty See the message after touching the sensor T2 Paper Empty T2 Paper Empty Empty Present T3 Paper Empty See the message after touching the sensor T3 Paper Empty T3 Paper Empty Empty Present Samsung Electronics Service Manual Alignment amp Adjustments Sensor Description Display
114. ng Electronics Disassembly and Reassembly 5 18 Fuser Ass y 1 Before you remove the Fuser Ass y you should 4 Remove two screws securing the Electrode L R and remove remove it as shown below Rear Cover Refer to the 5 14 Harness L 2 Pull the Locking Lever Then take out the Fuser Ass y as shown below 3 Remove two screws and take the Thermostat out of 5 Remove two screws securing the Fuser Upper Unit the Fuser Ass y and remove it as shown below Fuser Lower Unit EJ Service Manual Samsung Electronics Disassembly and Reassembly 6 Remove two screws securing the Release Lever L R 8 Take out the Heat Roller Ass y as shown below and remove it as shown below Pressure Roller Cover Fuser Lower Release Lever R Heat Roller Ass y 7 Remove two screws and take out the Gear Bracket P ser Gear 9 Remove the screw securing the Thermistor and remove it as shown below Thermistor Service Manual EJ Samsung Electronics Disassembly and Reassembly 5 19 Duplex Solenoid Ass y 1 Before you remove the Exit Solenoid Ass y you 4 Remove spring pin and remove two screws and take should remove out the Exit Solenoid Top Cover Refer to the 5 15 2 Unplug the Duplex Solenoid Harness from the Main Cw Duplex Solenoid Duplex Solenoid Spring
115. nine buttons 3 1 3 1 Display 1 Menu Enters Menu mode and scrolls through the available menus 2 Scroll buttons Scroll through the options available in the selected menu and increase or decrease values OK Confirms the selection on the display Back Sends you back to the upper menu level Demo Prints a demo page Stop Stops an operation at any time 3 4 5 Toner Save Allows you to save on toner by using less toner in printing 6 7 8 Status Indicates the status of your printer Service Manual EJ Samsung Electronics Summary of Product 3 1 3 2 Overview of Control Panel Menus The control panel menus are used to configure the printer for your environment The control panel provides access to the following menus Job Manage Active Job Store Job Paper Copies Paper Size Paper Type Paper Source Tray Chaining Graphic Resolution Darkness Image Enhance Network TCP IP EtherTalk NetWare Ethernet Speed Clear Setting Network Info Information Menu Map Configuraton Demo Page Stored Job Usage Page PCL Font List PS3 Font List EPSON Font Layout Orientation Simplex Margin Duplex Duplex Margin System Setup Date amp Time Form Menu Select Form Language Power Save Auto Continue Jam Recovery Altitu de Adj Auto CR Job Timeout Maintenance Clear Setting Emulation Emulation Type Setup a Availa
116. not a genuine cartridge This message appears when you selected Continue at the NonGenuine Toner prompt Install the genuine toner cartridge Toner Low Replace Toner The toner in the cartridge has run out Install a new genuine toner cartridge You can keep printing but the quality cannot be guaranteed and the product support is no longer provided You can configure not to see the Toner Low Replace Toner message Replace Toner The toner cartridge installed is not a genuine cartridge This message appears when you turned off the Toner Low Replace Toner message Install a new genuine toner cartridge You can keep printing but the quality cannot be guaranteed and the product support is no longer provided Toner Exhausted Stop p The lifespan of the toner cartridge is reached You can select either Stop or Continue If you do not select any the printer will work as Stop is selected If you select Stop you cannot print until the genuine cartridge is installed If you select Continue you can keep printing but the quality cannot be guaranteed and the product support is no longer provided If you want to change the selection turn the printer off and on to have this message appear again and then re select Stop or Continue Toner Exhausted Replace Toner1 The lifespan of the toner cartridge is reached This message appears when you selected Stop at the Toner Exhausted prompt Install the genuine to
117. oner stains between the high voltage terminal in the HVPS and the one in the set 4 Abnormal output from the HVPS Run self test and check 1 4 5 Check warranty out 6 2 6 Dark Image or a Black Page 1 Check if the Toner Save mode is off Check if the density is light 2 No 1 Replace the print cartridge and try to print out 3 No 2 Wait 30 minutes after printer is pow ered on before you start printing 4 No3 Clean up the contaminated area by the toner 5 Replace the HVPS if the problems are not solved by the above four instructions 6 Replace print cartridge Description The printed image is dark Check and Cause Solution 1 No charge voltage in the engine board 2 Charge voltage is not turned on due to the bad contacts between power supply in the side of the print cartridge and charge terminal of HVPS 3 VD0 signal of the Main PBA is Low state 4 Case back side the cleaning blade of print cartridge 1 Check the state of the connector which connects the engine board and HVPS 2 Clean the high voltage charge terminal 3 Replace the HVPS if not solved by the above direction 1 and 2 4 Replace the LSU Unit or Main PBA 5 Replace print cartridge Service Manual Samsung Electronics Troubleshooting 6 2 7 Uneven Density L Description Print density is uneven between left and right Diqit Check and Cause Solution igita
118. ons 2 4 2 2 1 General Specifications 2 1 222 Controler amp SW 2 2 223 Paper Handling gt s oe s saa a 2 3 2 2 4 Consumables 2 2 5 Reliability amp Service 2 2 6 Environment 227 xo ooo E Ee ee s a 2 5 228 OMES o AT Ba NA BANDIT Quy Q 2 5 2 3 Model Comparison Table 3 Summary of Product 3 1 Printer Components 3 1 1 FrontView lt x e lt lt lt lt lt lt w a woe Q W e w e n 3 1 312 Rear VIeW lt lt lt KA e m 6 3 2 3 1 3 3 3 3 2 System Layout 3 7 3 2 1 Feeding 322 Transfer i ehe est e ec a GG WAG deed 39 323 DriiverAssy boat oe Ble s sa aud 3 9 3 24 FUSE Qk MAE SU AN ee GAN e es 3 9 3 2 5 LSU Laser Scanner Unit 3 9 Continue 3 2 6 Print Cartridge 3 3 Engine H W Specifications 3 3 1 ML 4550 PCL Main Board 3 32 SMPS amp HVPS board 3 3 3 Engine FAW 4 Alignment and Adjustments 4 1 How to use EDC Engine Diagnostic Control Mode 414 EDC Setup 2 m mex eom Eom oe NA 4 12 Entrance method for EDC s rr t ee t t n 4 1 4 1 3 Cover Status 4 2 4 14 Sensor Status 4 3 41 6 Fanlest a GR SX d eS T 4 5 4 1 7 Clutch Sol 46 418 Fu
119. ont cover is opened Maintain a temperature of fuser cover s surface under 80 C for user and attach a caution label at where customer can see easily when customer open a rear cover 3 2 5 LSU Laser Scanner Unit It is the core part of the LBP which switches from the video data received to the controller to the electro static latent image on the OPC drum by controlling laser beam exposing OPC drum and turning principle of polygon mirror The OPC drum is turned with the paper feeding speed The HSYNC signal is created when the laser beam from LSU reaches the end of the polygon mirror and the signal is sent to the con troller The controller detects the HSYNC signal to adjust the vertical line of the image on paper In other words after the HSYNC signal is detected the image data is sent to the LSU to adjust the left margin on paper The one side of the polygon mirror is one line for scanning Service Manual EJ Samsung Electronics Summary of Product 3 2 6 Print Cartridge By using the electronic photo process it creates a visual image In the print cartridge the OPC unit and the toner cartridge unit are in a body The OPC unit has OPC drum and charging roller and the toner cartridge unit has toner supply roller developing roller and blade Doctor blade Developing Method Non contacting method Toner Non magnetic 1 component pulverized type toner The life span of toner 10 000 or 20 000 pages LSA Pattern
120. op and go to the next step 4 2 1 4 In the duplex unit area Duplex jam 0 1 Pull the duplex unit out of the printer 2 Locate the jammed paper and remove it 3 Insert the duplex unit into the slot 4 Open and close the top cover The printer will resume printing Service Manual ga Samsung Electronics Alignment amp Adjustments Duplex jam 1 1 Open the rear cover 2 Gently pull the jammed paper straight up 3 Close the rear cover 4 Open and close the top cover The printer will resume printing n Service Manual Samsung Electronics Alignment amp Adjustments 4 3 Sample Pattern This product has the several sample patterns for maintenance With the sample patterns check the existence of the abnormality The patterns help to regularly maintain the product 4 3 1 Information Pages Your printer comes with a set of information pages that helps you solve printing problems and obtain the best results from your printer You can access these pages from the printer s front panel To print information pages 1 On the printer s front panel press the Menu button then press the Enter button to select Information 2 Select Info Pages then press the Enter button Slect key 4 tind to intormation menu Press Enter key sutch to intormation page Press Enter key the printing 3 Select the appropriate i
121. ormed charged actuator Exit should return in shape to the original position to shut the Check whether burrs occur in the photo sensor Sometimes it takes assembly part of the actuator exit or longer hour than it should and does not and if the actuator is smoothly not return operated Check if foreign matter and wire get caught in the actuator exit s operation 2 If the paper is rolled in the Fuser Roller 2 If the paper is stuck in the fuser dis This occurs when a Guide claw is assemble the fuser and remove the broken away or transformed jammed paper and clean the surface e t occurs when the Spring of a Guide of the pressure roller with dry gauze claw is broken away or transformed It occurs when the Heat Roller or Pressure Roller is seriously contami nated with the toner 3 Paper is accordion in the fuser 3 Remove the jammed paper after disas sembling the fuser Clean the surface of the pressure roller with dry gauze Remove the toner particles stained on the rib Check the assemblage and perfor mance of the exit Service Manual Samsung Electronics Troubleshooting 6 3 5 Duplex Jam 1 Description message Duplex Jam 1 is displayed in a LCD window Check and Cause Solution 6 3 6 Duplex Jam 0 It is case when a paper can not operate a duplex sensor 2 It is a case when a paper can not reach to a duplex sensor due to a pa
122. our documents with words such as Confidential See the Software Section Print Posters The text and pictures of each page of your document are magnified and printed across the sheet of paper and can then be taped together to form a poster See the Software Section a pages per minute b images per minute Save your time and money This printer allows you to use toner save mode to save toner You can print on both sides of the paper to save paper double sided printing if you use the ML 4551ND or install the optional duplex unit in the ML 4550 and ML 4551N You can print multiple pages on a single sheet of paper to save paper N Up printing See the Software Section You can use preprinted forms and letterhead with plain paper See the Software Section This printer automatically conserves electricity by substantially reducing power consump tion when not in use Service Manual EJ Samsung Electronics Summary of Product Expand the printer capacity Your printer has 128 MB of memory which can be expanded to 512 MB Network interface enables network printing You can add an optional network interface card to the ML 4550 The ML 4551N and ML 4551ND come with a built in network interface 10 100 Base TX You can add 500 sheet optional trays to your printer These trays let you add paper to the printer less often A PostScript 3 Emulation PS enables
123. ped for engineers related not for end users Entering the mode the message COMPONENT TEST Press Menu Key is displayed In this mode an engineer should press the Menu Key to search each function he would like to test Usage 1 Check printer is powered on 2 Wait until the printer becomes a ready mode 3 Press Menu Stop gt Left 5 Back gt Ok Right in order 4 Confirm the message COMPONENT TEST Press Menu Key is displayed 5 Press Menu key 6 Follow a usage for a function you would like to use The procedure and content above can be changed according to the situation Service Manual 4 1 Samsung Electronics Alignment amp Adjustments 4 1 3 Cover Status This function is to check all cover sand all doors status Usage 1 Press the Arrow Keys 4 until finding Component Test 1 Cover Status message on the panel 2 Press the OK Key when it is found 3 Press the Arrow keys until finding a suitable function Refer to the table below 4 Press the OK Key when it is found 5 Press the OK Key for execution or the Back key for retum Function Function Name Description Display LCD Remarks Top Cover If the cover is opened Open message will be Top Cover displayed and if not Closed displayed Closed Open Tray1 Cassette If the Tray is opened Open message will be Tray1 Casse
124. per jam on a duplex path 1 Replace a SMPS or main PBA 2 A case that a paper jam occurs on A after it is reversed replace a 2nd exit roller after checking its operation 3 A case that a paper jam occurs on B after it is reversed replace a duplex roller after checking its operation e Description message Duplex Jam 2 is displayed in a LCD window Check and Cause Solution 1 It is a case that a paper cannot pass a duplex sensor 2 It is a case that a paper cannot reach to a registration sensor after it is passed a duplex sensor 1 Replace a SMPS or main PBA 2 A case that a leading edge of a paper is jammed on A check an operation of a guide front If it is worn or defective replace it 3 Check an operation of a feed roller and a registration roller If they are worn or defective replace them Samsung Electronics Service Manual n Troubleshooting 6 3 7 Multi Feeding L Description Multiple sheets of paper are fed at once Solution Check and Cause 1 Check the Guide side L R or Guide Rear in the Cassette if the position is correct 2 Solenoid malfunction the solenoid does not work properly Perform EDC Mode 3 Pad Friction is contaminated with foreign matter oil 4 The face of paper is blended 6 3 8 Paper rolled in the fuser 1 Replace the solenoid if necessary 2 Replace the Main PBA 3 Clean the pa
125. pin EJ Service Manual Samsung Electronics Disassembly and Reassembly 5 20 Exit Roller 1 Before you remove the Exit Roller you should 4 Release the Exit Gear as shown below remove Top Cover Refer to the 5 15 Bearing 2 Take out the Actuator Pa Y Actuator a UMA 5 sss s f v d o JA ji 44 2 Ms 1 oa Exit Gear 5 Remove the Duplex Exit Roller as same method Duplex Exit Roller 3 Remove the Exit Roller and Bearing as shown below Exit Roller x lt 6 Release the Duplex Exit Gear as shown below Bearing Duplex Exit Gear Service Manual EJ Samsung Electronics Disassembly and Reassembly 5 21 LSU 1 Before you remove the LSU you should remove Rear Cover Refer to the 5 14 Cover Right Refer to the 5 7 Cover Left Refer to the 5 13 Top Cover Refer to the 5 15 2 Remove the Cover Frame Exit and unplug the Cover Frame Exit Connector from the Main PBA as shown below 3 Remove three screws and take out the LSU Service Manual Samsung Electronics Disassembly and Reassembly 5 22 DC Fan 1 Before you remove the
126. plex Print Cartridge Q Fuser Duplex Solenoid Samsung Electronics Service Manual Summary of Product 3 2 1 Feeding It is consists of a basic cassette an MP tray for supplying different types of media envelope label spe cial paper duplex unit and parts related to paper transferring 1 Separation method Separate it from the friction pad mounted to the center of the cassette and apply retard roller that uses a spring clutch A feed roller uses an electronic clutch to control driving power 2 Basic cassette It takes a center loading method and applies friction pad separating method It means that there is a paper sensor but a paper size is detected after detecting the first paper by software Both the side guide and the rear guide can be adjusted for for various types of papers from 5 to legal size paper It has a paper existence sensing function Capacity 500 sheets of general paper paper arranging function various size papers accepting function SCF paper path function and displaying function of paper remaining amount In the front side there is a paper level indicator 3 Pick up roller It has functions such as a paper pickup function driving control function paper feeding function and removing electronic static function 4 Retard roller It takes an arrangement method which uses a stopper roller and a weight without electric actuator It has paper separating function driving control function
127. r check 4 Replace the Main PBA and or Sensor whether the assembly slot between shaft pickup and housing pickup opens or is broken away 5 If the paper feeds into the printer and Jam 0 occurs perform EDC Mode to check feed sensor of the engine board Service Manual KI Samsung Electronics Troubleshooting 6 3 3 JAM 1 1 Recording paper is jammed in front of or inside the fuser Description 2 Recording paper is stuck in the discharge roller and in the fuser just after passing through the Actuator Feed Check and Cause Solution 1 If the recording paper is jammed in 1 Replace the SMPS or Exit Sensor front of or inside the fuser 2 Replace the Main PBA 2 If the recording paper is stuck in the 3 Reassemble the Actuator Feed and discharge roller and the fuser just Spring Actuator if the movement is after passing through the Actuator bad Feed Feed Actuator may be defec tive 6 3 4 JAM 2 1 Recording paper is jammed in front of or inside the fuser Description 2 Recording paper is stuck in the discharge roller and in the fuser just after passing through the Actuator Feed Check and Cause Solution 1 If the paper is completely fed out of 1 Check if the exit sensor actuator is the printer but Jam 2 occurs Exit defective sensor is defective Check if the actuator exit is deformed After the paper is completely dis Check if the lever part is def
128. r Engine Fuser Over Heat Error is displayed in a LCD Check and Cause Solution Check whether a thermostat open or not 2 Check whether a thermistor is open or not 3 Heat lamp ON OFF test 4 It could not operate due to a gear of a fuser is melted 6 4 2 LSU Error 1 Replace the fuser if a thermostat is open 2 Replace the fuser if a thermistor sensor is located deep inside of a sponge 3 Check whether the overheat mode circuit operates normally or not 4 Replace the fuser Description A message Engine Hsyne Error is displayed in a LCD panel Check and Cause Solution 1 Check whether the LSU connector is disconnected or not 2 Check whether the LSU motor is rotating or not 3 Check the HSYNC signal 1 Connect the LSU harness properly 2 Replace a LSU 3 Replace a main board if the same error occurs again after replacing a LSU CO Service Manual Samsung Electronics Troubleshooting 6 4 3 Not function of the gear of the fuser due to melting away U Description The motor breaks away from its place due to gear melting away Check and Cause Solution 1 Check the Fuser Unit 1 Replace the Fuser 2 Replace the Main PBA 2 Replace the SMPS 6 4 4 Paper Empty Description paper lamp on the operator panel is on even when paper is loaded in the cassette Check and Cause Solution 1 Bending or deformat
129. ref is R1x 5V R1 R2 Service Manual EJ Samsung Electronics Summary of Product 3 3 2 SMPS amp HVPS board Outputs 5V 24V to supply the power to the main board and Optional Board SCF Duplex Not ADF Board SMPS HVPS Service Manual 3 46 Samsung Electronics Summary of Product 3 3 2 1 HVPS High Voltage Power Supply Transfer High Voltage THV Input Voltage 24 V DC 15 Output Voltage MAX 5 0KV 5 Duty Variable no loading 1 2KV 15 when cleaning 20040 Output Voltage Trigger 6 5 Input contrast of the Voltage stability degree under 5 fluctuating input 21 6V 26 4V Loading contrast 5 or less Output Voltage Rising Time 100 ms Max Output Voltage Falling Time 100 ms Max Fluctuating transfer voltage with environmental various 650 V Duty 10 5 KV Duty 90 Environment Recognition Control Method The THV PWM ACTIVE is transfer active signal It detects the resistance by recognizing the voltage value F B while permits the environmental recognition voltage Output Voltage Control Method Transfer Output Voltage is outputted and controlled by changing Duty of THVPWM Signal 10 Duty 650V 90 Duty 5KV 5 Fuser Voltage Input Voltage 24 V DC 15 Output Voltage 30V 1000V DC 30V Output Voltage Rising Time 50 ms Max Output Voltage Falling Time 50 ms Max Output Loading range 30 MQ 1000 MQ Output Con
130. remove the 7 Push the Idle toward the ends of Shaft then take out Shaft the Housing as shown below Housing Service Manual Samsung Electronics Disassembly and Reassembly 5 26 Pick Up amp Feed2 Ass y Before you remove the Pick Up Ass y you should 4 Remove four screws securing the Bottom Cross Bar remove and remove it Main Drive Ass y Refer to the 5 9 Right Cover Refer to the 5 7 Remove the Gear Pick Up Cam as shown below Gear Pick Up Cam 3 Release the Pick Up Gear and remove the locking equipment rotate the Bearing in the direction of arrow as shown below Bearing Feed2 Gear Service Manual Samsung Electronics Disassembly and Reassembly 6 Remove four screws securing the Guide P Front 9 Remove the Feed2 Ass y as shown below Then take out the Pick Up Unit as shown below Guide M Support 6 EI Beating a Shaft Feed1 Roller We Ass y 10 Remove four screws securing the Feed2 Unit and remove it as shown below 7 Remove two screws securing the Guide M Support and remove it Guide P Front Guide M Support 8 Remove the Feed1 Ass y as shown below Bushing Feed Guid
131. ridge and try to print out Description Ghost occurs at 95 mm intervals of the OPC drum in the whole printing When printing on card stock or transparencies using manual feeder Digital Printer Digital Printer Digital Printer G6 Check and Cause Solution When printing on card stock thicker than nor mal paper or transparencies such as OHP higher transfer voltage is required Select Card stoc or OHP Film on paper type menu from the software application and after using returning to the original mode is recommended Service Manual Samsung Electronics Troubleshooting 6 2 11 Ghost 3 Fuser L e Description Ghost occurs at 126 mm intervals Check and Cause Solution Digital Printer The temperature of the fuser is maintained high Digital Printer 92 Digital Printer 6 2 12 Stains on the Face of Page 1 Disassemble the fuser and remove the contaminated toner particles on the roller and clean the foreign matter between Thermistor and Heat roller Caution can be deformed Description background on the face of the printed page is stained J DE ME Check and Cause Solution Digital Printer Diai D reta 1 Toner leakage due to improperly sealed 1 Replace the print cartridge and clean to igital Printer 4 Me print cartridge the toner powder of machine Digital Prin
132. rmal 5 If the problem is still not solved replace the print cartridge Service Manual KI Samsung Electronics Troubleshooting 6 2 9 Ghost 1 L Description Ghost occurs at 95 mm intervals of the OPC drum in the whole printing J Digital Printer Digital Printer Digital Printer 66 6 2 10 Ghost 2 Check Cause Solution 1 Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the elec trode of the print cartridge 2 Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the one in the HVPS board 3 The life of print cartridge is expired 4 Transfer roller lifetime 150 000 sheets has expired 5 Abnormal low temperature below 10 C 6 Damaged cleaning blade in the print cartridge 1 Clean the terminals when contaminated by toner particles 2 Occur in the print cartridge replace the print cartridge and try to print out 3 Replace the engine board if not solved by the above directions 1 2 4 If not solved by the direction 3 check the transfer roller lifetime and replace it 5 Wait about 1 hour after power on before using printer 6 Occur in the print cartridge replace the print cartridge and try to print out Description Ghost occurs at 95 mm intervals of the OPC drum in the whole printing When printing on card sto
133. roller after checking its operation 3 A case that a paper jam occurs on B after it is reversed replace a duplex roller after checking its operation e Description message Duplex Jam 2 is displayed in a LCD window Check and Cause Solution 1 It is a case that a paper cannot pass a duplex sensor 2 It is a case that a paper cannot reach to a registration sensor after it is passed a duplex sensor 1 Replace a SMPS or main PBA 2 A case that a leading edge of a paper is jammed on A check an operation of a guide front If it is worn or defective replace it 3 Check an operation of a feed roller and a registration roller If they are worn or defective replace them Samsung Electronics Service Manual n Troubleshooting 6 3 7 Multi Feeding L Description Multiple sheets of paper are fed at once Solution Check and Cause 1 Check the Guide side L R or Guide Rear in the Cassette if the position is correct 2 Solenoid malfunction the solenoid does not work properly Perform EDC Mode 3 Pad Friction is contaminated with foreign matter oil 4 The face of paper is blended 6 3 8 Paper rolled in the fuser 1 Replace the solenoid if necessary 2 Replace the Main PBA 3 Clean the pad friction with soft cloth dampened with IPA Isopropyl Alcohol 4 Use the smooth paper Description If contaminated at intervals of 57m
134. roperly set up check in which program the printing is not working The best way to find out is to open the memo pad to check the function of printing If it is not working in a certain program adjust the setup the program requires Sometimes the printout is normal within the Windows basic programs but it s not work ing in a particular program In such case install the new driver again If not working in the Windows basic program Check the setup of the port of CMOS is on ECP And check the address of IRQ 7 and 378 4 If the scanner needs to be connected to the printer first the remove the scanner from the PC to see if the printer is properly working alone Samsung Electronics Service Manual CI Troubleshooting 6 6 2 The printer is not working 2 Description After receiving the printing order no response at all or the low speed of printing occurs due to wrong setup of the environment rather than malfunction of the printer itself Check and Cause Solution Secure more space of the hard disk 2 Printing error occurs even if there is enough space in the hard disk 3 Check the parallel port related items in the CMOS Setup 4 Reboot the system to print 1 Not working with the message insufficient printer memory means hard disk space problem rather than the RAM problem In this case provide more space for the hard disk Secure more space using the disk utilities program N
135. s are not stored in memory 2 Be sure to remove the print cartridge before you disassemble parts 3 Unplug the power cord 4 Use a flat and clean surface 5 Replace only with authorized components 6 Do not force plastic material components 7 Make sure all components are in their proper position Releasing Plastic Latches Many of the parts are held in place with plastic latches The latches break easily release them carefully To remove such parts press the hook end of the latch away from the part to which it is latched Samsung Electronics Service Manual ES Disassembly and Reassembly 5 2 Transfer Roller 1 Open the Open Cover 2 Hold the lever at both ends of the roller then remove the roller Open Cover lt Cautions When Replacing a Transfer Roller gt Do not grab the Transfer Roller shown in picture A It may cause a malfunction due to a foreign object Hold the both side of the Transfer Roller shown in picture B when replacing it Service Manual Samsung Electronics Disassembly and Reassembly 5 3 MPF Ass y 1 Open the MPF Ass y 3 Remove the Tray Link from the MP Cover 2 Remove two springs from the Knock Up Plate Ass y 4 Push the MP Cover and remove it as sho
136. se Default TX Internal Default Hard Disk 40GB Duplex Unit Optional 2 2 8 Others ML 4550 SERIES ML 4550 ML 4551N Performance Jam Rate Base Line Paper 1 12K Requirement Standard Paper 1 10K Stress Paper 1 1500 Default ML 4551ND Samsung Electronics Service Manual Specifications 2 3 Model Comparison Table Project SEC HP Lexmark Brother Dell Model Name ML 4550 LJ 4250 T642 HL 8050N W5200N h am h v US LIE Engine FPOT 8 5 sec 8 sec 8 5 sec 9 sec 8 5 sec Speed ppm 43ppm Ltr 45ppm 43ppm Ltr 45ppm 43ppm Ltr 45ppm 34ppm Ltr 35ppm 43ppm Ltr 45ppm Resolution 1200 dpi 1200 dpi 1200 dpi x 1200 dpi 1200dpi x 1200 dpi 1200 dpi x 1200 dpi Noise dB 57dB Printing 35dB Idle not_inform 55dB Printing 30dB Idle 54dB Printing 27dB Idle 55dB Printing 34dB Idle Weight 17 83kg 20 2kg 45 Ibs 23 1Kg 51165 20 6Kg 45 2 Ibs 45lbs Demension W D H 15 6 x 17 8 x 13 9 16 5 x17 8 x14 8 436x523x406mm 16 6 x 18 3 x 15 9 17 2 x20 2 x16 396 x 453 x 353 mm 418x451x377mm 17 2 x20 6 x16 Control Processor 500MHz 460MHz 457 MHz RISC 300MHz 500 MHz RISC Ram Std 128MB 48MB 64MB 64MB 80MB Ram Max 512MB 512MB 576MB 576MB 336MB Emulation PCL6 PS3 PCL6 PS3 PCL6 PS3 PCL6 PS3 PCL6 PS3 10 100 Base TX 10 100 Base TX Interface IEEE1284 USB 2 0 IEEE1284 USB 2 0 IEEE1284 USB 1 1 IEE
137. sensor PBA 3 Check the connector and harness Service Manual CO Samsung Electronics Troubleshooting 6 4 5 Paper Empty without indication Description A message Paper Empty is displayed in a LCD panel The paper lamp on the operator panel does not come on when the paper cassette is empty Check and Cause Solution 1 Bending or deformation of the actuator of the paper sen sor 2 Check the Main board 3 Check the empty sensor board 4 Check the toner sensor board 6 4 6 Cover Open 1 Replace the defective actuator 2 Replace the board which has a trouble Description message Colse Top Cover is displayed in a LCD panel The ERROR lamp is on even when the print cover is closed Check and Cause Solution 1 The hook lever in the top cover may be defective 2 Check the main board 3 Check the cover open board 4 Check the harness and connection 1 Replace the hook lever if defective 2 Check the insertion of the cover open S W connect 3 Replace the main board or cover open board Service Manual Samsung Electronics Troubleshooting 6 4 7 No error message when the cover is open e Description The ERROR message does not come on even when the printer cover is open Check and Cause Solution 1 Check the cover open circuit on the main board 1 Check the insertion of the cover open SW connect 2 Check the cover
138. ser Ci eoe ea ANA ee ee woe SAT 449 LSU waw ae s LAN 45 Ba MR dew mom 47 4 1 10 Deve Control 4 1 11 Print Test and Option version 4 2 Paper Path 4 2 1 Clearing Paper Jams 4 3 Sample Pattern 4 3 1 Information Pages 4 3 2 Demo Pages 4 4 Periodic Defective Image 4 5 Error Messages 5 Disassembly and Reassembly 5 1 General Precautions on Disassembly 5 2 Transfer Roller b AN an cla cde c Ad us 53 MPFASEV Xa ee we decur CSA ES Cete d Ron dtd 5 3 5 4 Holder Pad Ass y 55 RetadAssy 0 020 2 rns 5 5 5 6 Feed2 Idle Unit 5 7 Cover Right e c 5 7 Continue 5 8 Main PBA 5 9 Main Drive Ass y 5 10 DEVE Drive Ass y 5 11 Connector PBA 5 12 Solenoid 5 13 Rear Cover 5 14 Cover Left 5 15 Top Cover 5 16 Open Cover 5 17 Inner Cover 5 18 Fuser Ass y 5 19 Duplex Solenoid Ass y 5 20 Exit Roller 5 21 LSU 5 22 DC Fan 5 23 Toner Sensor PBA 5 24 REGI Assy 5 25 MP Pick Up Assy 5 26 Pick Up amp Feed2 Assy 5 27 Engine Shield 6 Troubleshooting 6 1 The cause and solution of Bad image 6 2 The cause and solution of the bad discharge 6 3 The cause and solution of the malfunction 6 4 Maintaining the toner cartridge 6 5 The cause and solutions of bad environment of the software s 7 Exploded Views amp Parts List TA ManAssembly o o eoo noy RO 7 2 7 2 Cover Assembly 7 3 Frame Assembly 7 4 Fuser Unit
139. set up 3 As a printer port Select ECP or SPP among SPP Normal ECP and EPP modes increase print ing speed SPP normal mode support 8 bit data transfer while ECP Mode transfer the 12 bit data 4 f the regular font is not printing the cable or the printer driver may be defective Tum the PC and printer off and reboot the system to print again If not solved double click the printer in my computer If the regular fonts are not printed this time again the cable must be defective so replace the cable with new one Service Manual Samsung Electronics Troubleshooting 6 6 3 Abnormal Printing The printing is not working properly even when the cable has no problem even after the cable is replaced If the printer won t work at all or the strange fonts are repeated the printer driver may be defec tive or wrong setup in the CMOS Setup Description Check and Cause Solution 1 Set up the parallel port in the CMOS SETUP 1 Select SPP Normal or ECP LPT Port the among ECP EPP or SPP in the CMOS Setup 2 Printer Driver Error 2 Check the printer in My Computer to see if the printer driver is compatible to the present driver or delete the old driver if defective and reinstall the new driver 3 Error message from insufficient memory 3 Delete the unnecessary files to secure enough The printing job sometimes stops or due to insufficient space of the hard disk and start printing job again virtu
140. t is certified as a Class laser product conforming to the requirements of IEC 825 Class laser products are not considered to be hazardous The laser system and printer are designed so there is never any human access to laser radiation above a Class level during normal operation user maintenance or prescribed service condition Warning gt gt Never operate or service the printer with the protective cover removed from Laser Scanner assembly The reflected beam although invisible can damage your eyes When using this product these basic safety pre cautions should always be followed to reduce risk of fire electric shock and injury to persons CAUTION INVISIBLE LASER RADIATION WHEN THIS COVER OPEN DO NOT OPEN THIS COVER VORSICHT UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GE FFNET NICHT DEM STRAHL AUSSETZEN ATTENTION RAYONNEMENT LASER INVISIBLE EN CAS D OUVERTURE EXPOSITION DANGEREUSE AU FAISCEAU ATTENZIONE RADIAZIONE LASER INVISIBILE IN CASO DI APERTURA EVITARE L ESPOSIZIONE AL FASCIO PRECAUCION RADIACION LASER IVISIBLE CUANDO SE ABRE EVITAR EXPONERSE AL RAYO ADVARSEL USYNLIG LASERSTR LNING VED BNING N R SIKKERHEDSBRYDERE ER UDE AF FUNKTION UNDG UDSAETTELSE FOR STR LNING ADVARSEL USYNLIG LASERSTR LNING N R DEKSEL PNES STIRR IKKE INN STR LEN UNNG EKSPONERING FOR STR LEN VARNING OSYNLIG LASERSTR LNING N R DENNA DEL R PPNAD OCH SP RREN R URKOPPLAD BETRAKTA EJ STR LEN STR LEN R FARLIG AVA
141. t side Samsung Electronics Service Manual Disassembly and Reassembly 5 15 Top Cover 1 Before you remove the Top Cover you should 4 Unlatch both ends of the Top Cover remove Rear Cover Refer to the 5 14 Cover Right Refer to the 5 7 Cover Left Refer to the 5 13 2 Open the MPF Ass y the Rear Cover the Open Cover Open Cover MPF Ass y 3 Unplug the two Connectors after you remove the three screws from the Main PBA Z ee FLL PKL 2 J Service Manual EJ Samsung Electronics Disassembly and Reassembly 6 Remove seven screws and then take out the LCD Panel and the Key Panel Key Panel 5 16 Open Cover Before you remove the Open Cover you should remove Top Cover Refer to the 5 15 3 Take out the Open Cover as shown below 2 Remove two screws and take out the Stopper Open Cover EJ Service Manual Samsung Electronics Disassembly and Reassembly 5 17 Inner Cover 1 Before you remove the Inner Cover you should remove MPFAss y Refer to the5 3 Top Cover Refer to the 5 15 2 Remove two screws and take out the Inner Cover Service Manual Samsu
142. ted messages Message Meaning Suggested solutions Install Toner A toner cartridge is not installed Install a toner cartridge Invalid Toner The toner cartridge you have Install a Samsung genuine toner cartridge designed for your printer installed is not for your printer Toner Low The toner cartridge is almost empty Take out the toner cartridge and thoroughly shake it By doing this you can temporarily reestablish printing operations NonGenuine Toner The toner cartridge installed is not You can select either Stop or Continue If you do not select any the Stop gt a genuine cartridge printer will work as Stop is selected If you select Stop you cannot print until the genuine cartridge is installed However you can still print any kind of reports If you select Continue you can keep printing but the quality cannot be guaranteed and the product support is no longer provided If you want to change the selection turn the printer off and on to have this message appear again and then re select Stop or Continue NonGenuine Toner The toner cartridge installed is not This message appears when you selected Stop at the NonGenuine Replace Toner1 a genuine cartridge Toner prompt Install the genuine toner cartridge NonGenuine Toner Replace Toner The toner cartridge installed is not a genuine cartridge This message appears when you selected Continue at the NonGenuine Toner prompt Install the genuine toner cartridge
143. ter oa W redet gee Digital Printer 2 If the transfer roller is contaminated stains 2 If the transfer roller is contaminated run Digital Printer on the face of page will occur OPC Cleaning Mode Print 2 or 3 times And perform Self Test 2 or 3 times to remove contamination Service Manual 6 7 Samsung Electronics Troubleshooting 6 2 13 Stains on the Back of Page Description back of the page is stained at 55 or 126 mm intervals J Check and Cause Solution 1 55mm Transfer roller is contaminated 1 1 Perform the OPC Cleaning Mode Print 2 or 3 times Run Self Test to remove the Digital Printer contamination of the transfer roller Digital Printer 1 2 Replace the transfer roller if contaminated Digital Printer severely 2 126mm Pressure roller is contaminated 2 1 Perform the fuser cleaning mode print 2 or 3 tiones 2 2 Disassemble the fuser and clean the H R Heat Roller and P R Pressure roller And check the area between H R and Thermistor If contaminated clean the area not to be deformed 6 2 14 Blank Page Print out 1 Description Blank page is printed J Check and Cause Solution Bad ground contacts in OPC and or print 1 Check if the Ground OPC is defective set cartridge inside left side 2 Remove contamination of the terminals of the print cartridge and the unit 6 2 15 Blank Page Print out 2 1 Blan
144. toner Following the key formation at the panel note the toner remaining level on the cartridge information after taking out the configuration sheet In other way to check follow the TECH mode and out put the cartridge information The display shows the percentage of the remaining toner 1 Service Manual Samsung Electronics Troubleshooting 6 5 2 Redistributing toner cartridge When the toner cartridge is near the end of its life White streaks and light printing occur Toner Low appears on the display The Smart Panel program window appears on the computer telling you that the toner level is low The Status LED blinks red If this happens you can temporarily reestablish print quality by redistributing the remaining toner in the cartridge In some cases white streaks or light printing will still occur even after you have redistributed the toner 1 Open the top cover 2 Pull the toner cartridge out Caution Avoid reaching too far into the printer The fusing area may be hot To prevent damage to the toner cartridge do not expose it to light for more than a few minutes Cover it with a piece of paper if necessary Do not touch the green surface underside of the toner cartridge Use the handle on the cartridge to avoid touching this area 3 Thoroughly shake the cartridge 5 or 6 times to distrib ute the toner evenly inside the cartridge Note If toner gets on yo
145. trol Signal MHV PWM CPU is HV output when PWM is Low Cleaning Voltage THV The Transfer Voltage is not outputted because the THV PWM is controlled with high The Transfer Voltage is outputted because the THV Enable Signal is controlled with low The output fluctuation range is big because there is no Feedback control Developing Voltage DEV Input Voltage 24 V DC 15 Output Voltage 200V 600V DC 20V Output Voltage Fluctuation range PWM Control Input contrast of the output stability degree 5 or less Loading contrast 5 or less Output Voltage Rising Time 50 ms Max Output Voltage Falling Time 50 ms Max Output Loading range 10M Q 1000 M Q Output Control Signal BIAS PWM the CPU output is HV output when PWM is low Supply Output Voltage 400V 800V DC 50V ZENER using DEV Input contrast of the output stability degree under 5 Loading contrast 5 or less Output Voltage Rising Time 50 ms Max Output Voltage Falling Time 50 ms Max Output Loading range 10 M 1000 MQ Output Control Signal BIAS PWM the CPU is HV output when PWM is low Service Manual Samsung Electronics Summary of Product 3 3 2 2 SMPS Switching Mode Power Supply It is the power source of entire system It is assembled by an independent module so it is possible to use for common use It is mounted at the bottom of the set Itis consisted of the AMPS part
146. tronics Alignment amp Adjustments Function Function Name Description Display LCD Remarks LD Power 1 amp 2 The LD will have the saved value previously LD Power 182 ON OFF Laser Motor The motor will run or stop Laser Motor ON OFF Laser Ready When Laser Scanning Unit is ready to print Laser Laser Ready diode on Stable polygon motor speed the message Normal Normal is displayed On the other case Fault The procedure and content above can be changed according to the situation 4 1 10 Deve Control These functions are to check whether the control for HVPS is normal or not Usage 1 Press the Arrow Keys 4 p until finding Component Test 8 Deve Control message on the panel 2 Press the OK Key when it is found 3 Press the arrow keys until finding a suitable function Refer to the table below 4 Press the OK Key when it is found 5 Press the OK Key for execution or the Cancel key for stop Function Function Name Description Display LCD Remarks THV Plus Bias The bias will have the previously saved value THV Plus Bias ON OFF THV Minus Bias The bias will have the previously saved value THV Minus Bias ON OFF DEV Bias The bias will have the previously saved value DEV Bias ON OFF DEV AC Bias The bias will have the previously saved value DEV AC Bias ON OFF DEV Vpp
147. tte displayed and if not Closed displayed Closed Open Tray2 Cassette If the Tray is opened Open message will be Tray2 Cassette displayed and if not Closed displayed Closed Open Tray3 Cassette If the Tray is opened Open message will be Tray3 Cassette displayed and if not Closed displayed Closed Open Tray4 Cassette If the Tray is opened Open message will be Tray4 Cassette displayed and if not Closed displayed Closed Open Fuser Door If the Door is opened Open message will be Fuser Door displayed and if not Closed displayed Closed Open The procedure and content above can be changed according to the situation KI Service Manual Samsung Electronics 4 1 4 Sensor Status These Functions are to check a current state normal or not of each Sensor Usage The other sensors 1 Press the Arrow Keys lt gt until finding Component Test 2 Sensor Status message on the panel 2 Press the OK Key when it is found 3 Press the Arrow keys until finding a suitable function Refer to the table below 4 Press the OK Key when it is found 3 Touch a sensor you would like to test 4 Check the message on the LCD window for the state of it Alignment amp Adjustments Function Sensor Description Display LCD Remarks Before touching After touchi
148. ugh memory to the PC In the spool manager the installed drivers and the list of the documents waiting to be printed are shown Select the document to be deleted and check the delete menu If you intend to delete the current document being printed the data being transferred to the printer will be put out and then the document is removed Before choosing the document the menu is still inactive Or put the document out of the list and repeat the routine as in the above or finish the spool manager CI Service Manual Samsung Electronics Exploded Views amp Parts List 7 Exploded Views and Parts List ML 4550 Series 74 Main Assembly 72 Cover Assembly 73 Frame Assembly 74 Fuser Unit 7 5 REGIAssembly 76 Main Motor Assembly 77 Deve Motor Assembly 78 Exit Sorenoid Assembly 79 Cassette Assembly 7 10 Duplex Unit 7 11 SCF Unit DIGITAL LASER PRINT CONTENTS The keynote of Product Series Model ML 4550 4551N 4551ND High speed Laser Printer Up to 43 ppm in A4 45 ppm in Letter Duplex 29 ipm A4 30 ipm Letter Resolution Up to 1200 x 1200 dpi Marvell 500Mhz Memory 128 MB Max 512 MB 128 or 256 MB optional memory available Use only the Samsung approved DIMM 128 MB 150 256 MB ML MEM160 Option ML 4550 500 sheet trays ethernet 10 100 Base TX wired LAN ethernet 10 100 Base hard disk duplex unit DIMM Toner cartridge Starter 10K or 20K pages Consumable
149. ul pictures on the cartridge wrapping paper 5 Remove the flexible plastic holder out of the toner cartridge Caution Do not use sharp objects such as a knife or scissors to open the toner cartridge package They might scratch the drum of the cartridge ma Manual Samsung Electronics Troubleshooting 6 Thoroughly shake the cartridge 5 or 6 times to distrib Caution If toner gets on your clothing wipe it off with ute the toner evenly inside the cartridge a dry cloth and wash clothing in cold water Hot water sets toner into fabric To prevent damage to the toner cartridge do not expose it to light for more than a few minutes Cover it with a piece of paper if necessary Do not touch the green surface underside of the toner cartridge Use the handle on the cartridge to avoid touching this area T Hold the toner cartridge by the handle and slowly insert the cartridge into the opening in the printer Thoroughly roll the cartridge to assure maximum Tabs on the sides of the cartridge and corresponding copies per cartridge Save the box and the plastic bag grooves within the printer will guide the cartridge into for shipping the correct position until it locks into place completely 8 Close the top cover Make sure that the cover is securely closed Service Manual Samsung Electronics Ga Troubleshooting 6 5 4 Toner Cartridge rela
150. ur clothing wipe it off with a dry cloth and wash clothing in cold water Hot water sets toner into fabric Samsung Electronics 4 Hold the toner cartridge by the handle and slowly insert the cartridge into the opening in the printer Tabs on the sides of the cartridge and corresponding grooves within the printer will guide the cartridge into the correct position until it locks into place completely 5 Close the top cover Make sure that the cover is securely closed Service Manual Troubleshooting 6 5 3 Replacing the toner cartridge When the toner cartridge is completely empty Replace Toner appears on the display Smart Panel program window appears on the computer telling you that the toner cartridge is empty Status LED lights red At this stage the toner cartridge needs to be replaced For order information for toner cartridges Note This feature does not work for the Toner Empty message 1 Open the top cover 4 Locate the sealing tape at the end of the toner cartridge Carefully pull the tape completely out of the 2 Pull the toner cartridge out cartridge and discard it Note sealing tape should be longer than 60 cm when correctly removed Holding the toner cartridge pull the sealing tape straight to remove it form the cartridge Be care ful not to cut the tape If this happens you can not use the toner cartridge Refer to the helpf
151. urr of the exposure window print cartridge frame print cartridge 4 If the fuser is defective voids occur 4 No 4 Open the front cover and check periodically at the top of a black image ribs that corresponds to the position of the voids Remove if found 5 It may occur when foreign substances 5 If the problems are not solved replace are on the OPC Drum the print cartridge 6 Partly depression or deformation on the 6 Replace the transfer roller if occured as surface of the transfer roller NO 6 Service Manual Samsung Electronics 6 2 3 Horizontal Black Band Troubleshooting 1 Dark or blurry horizontal stripes occur in the printing periodically Check and Cause Solution Digital Print Digital Printer 1 Bad contacts of the voltage terminals to Kali print cartridge Digital Printer Digital Print 2 The rollers of print cartridge may be stained Charge roller 38mm Develop roller 45mm Transfer roller 55mm OPC Drum 95mm 6 2 4 Black White Spot 1 Clean each voltage terminal of the Charge Supply Develop and Transfer roller remove the toner particles and paper par ticles 2 Clean the right Gear that has relatively small gap of the teeth in the OPC 3 If the malfunction persists replace the print cartridge pes eaphon 2 White spots occur periodically in the printing 1 Dark or blurry black spots occur periodically in the printing
152. which supplies the DC power for driving the system and the AC heater control part which supplies the power to fuser SMPS has two output channels Which are 3 3V and 24V AC Input Input Rated Voltage AC 220V 240V 120V AC 220V EXP version Input Voltage fluctuating range AC 198V 264V 90V 135V AC 198V 264V EXP version Rated Frequency 50 60 Hz Frequency Fluctuating range 47 63 Hz Input Current Under 4 0Arms 2 0Arms But the status when lamp is off or rated voltage is inputted outputted Rated Output Power NO ITEM CH1 CH2 CH3 1 CHANNEL NAME 5V 24V1 24V2 2 CONNE CTOR PIN CON 21 CON 21 5V PIN 12 14 16 18 24V PIN 2 4 6 8 GND PIN 20 22 24 GND PIN 26 27 28 3 Rated Output 5 0V 5 240V 5 4 75V 525V 21 6V 264V 4 Max Output Current 4 0A 7 5A 5 Peak Loading Current 4 4A 8 0A 6 RIPPLE NOISE Voltage Under 100mVp p Under 100mVp p 7 Maximum output 16 0W 127 2W 8 Peak output 20 0W 180 0W 9 Protection for loading shortage overflowing current Power Consumption CH1 3 3V CH2 5V CH3 24V ANG 55 Wh PRINTING ANG 280 Wh Sleep Mode AVG 10 Wh Length of Power Cord 1830 50mm Power Switch Use EJ Service Manual Samsung Electronics Summary of Product Feature Insulating Resistance 50 or more at DC 500V Insulating revisiting pressure Must be no problem w
153. wn below Service Manual Samsung Electronics Disassembly and Reassembly 5 Remove MP Cover in the direction of arrow as shown NOTICE Do not separate the spring from the MP Pick Up below Rack for convenience of assembling Locate the hook sec tion of the spring that is connected to the Knock Up Plate Ass y as shown in the outside for convenience of assembling MP Pick Up Rack Knock Up Plate Ass y Tray Link 5 4 Holder Pad Ass y 1 Before you remove the Holder Pad Ass y you should 3 Remove the Photo Interrupter and the MP Actuator remove MPFAss y Refer to the5 3 as shown below 2 Unplug the connector and remove the three screws as shown below Service Manual 5 4 Samsung Electronics Disassembly and Reassembly 5 5 Roller Idle ASS Y 1 Remove the Roller Ass y as shown below 2 Releasse the lock as shown below and take out the retard Ass y Service Manual Samsung Electronics Disassembly and Reassembly 5 6 Feed2 Idle Unit 1 Before you remove the Feed2 Idle Unit you should 2 Remove four screws Then lift the Idle Unit as shown remove below Holder Pad Ass y Refer to the 5 4
154. y quantity RAM Random Access Memory ROM Read Only Memory SCF Second Cassette Feeder SMPS Switching Mode Power Supply SPGP Samsung Printer Graphic Processor SPL Samsung Printer Language Spool Simultaneous Peripheral Operation Online SW Switch Sync synchronous or synchronization USB Universal Serial Bus WECA Wireless Ethernet Compatibility Alliance Service Manual EU Samsung Electronics Reference Information 11 3 Select a location for the printer Leave enough room to open the printer trays covers and allow for proper ventilation see diagram below Provide the proper environment A firm level surface Away from the direct airflow of air conditioners heaters or ventilators Free of extreme fluctuations of temperature sunlight or humidity Clean dry and free of dust I S an 100 mm 100 mm lt p 3 9 in 3 9 in VEMM D I E E I N m I Service Manual Samsung Electronics Reference Information 11 4 Sample Tests Patterns The sample patterns shown below are the standard test patterns used in the factory The life of the toner cartridge developer cartridge and printing speed are measured with the pattern shown below The A4 ISO 19752 standard pattern samples are reproduced reduced to 70 of the actual A4 size XYZ LMNOPQRSTUVW gt pQRSTUVWXYZ0 1234

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