LASER PRINTER ML-1650Series ML-1650 / ML-1651N SERVICE LASER PRINTER Manual CONTENTS 1. Precautions 2. Specifications 3. Disassembly and Reassembly 4. Troubleshooting 5. Exploded Views and Parts List 6. Block Diagram 7.
This service manual is also provided on the web, the ITSELF system f Samsung Electronics Co., Ltd. “http://itself.sec.samsung.co.kr” © Samsung Electronics Co.,Ltd. September 2001 Printed in Korea. VERSION NO. : 2.
This manual is stated and provided for service description. All rights reserved. Any parts of the information in this manual are prohibited from free duplication, use or translation without prior written approval except in cases allowed by the Copyright Act. Specifications are subject to change without prior notice. Samsung Electronics Digital Printing CS Group Copyright (c) 2001. 6.
Precautions 1. Precautions Please read the following carefully to prevent any accidents and not to damage the unit during service. 1-1 Safety Precautions Read each caution carefully: 1. Do not use this printer near water or when exposed to inclement weather. 2. Do not place this printer on an unstable cart, stand or table; the product may fall, causing serious damage to the product. 3. Slots and openings in the cabinet are provided for ventilation.
Precautions 1-2 Precautions on Disassembly and Reassembly Very careful precautions should be taken when replacing parts. Before replacing, please check cables because you cannot put the cables that you removed for replacing parts into the proper place if you would not make sure of where they were connected and in which condition. 7. When disassembling, assembling, also observe small components are located in place. 8.
Precautions 1-3 Tools for Troubleshooting The following tools are recommended for safe and smooth troubleshooting described in this service manual. 1 DCU(Diagnostic Control Unit) Standard: Test equipment to diagnose the Laser printer supplied by Samsung Electronics. 4 Driver Standard: "-" type, "+" type (M3 long, M3 short, M2 long, M2 short). 5 Pinset Standard: For general home use, small type. 2 DVM(Digital Volt Meter) Standard: Indicates more than 3 digits.
Specifications 2. Specifications ML-1650 Engine Speed ML-1651N 17 PPM(Letter) , 16PPM(A4) Resolution 1200 * 1200 First Print Time Tray 1 : Less than 14 seconds Tray 2 : Less than 17 seconds Warm-Up Time Less than 40 seconds Power Consump. Print : 300 W, Sleep mode : Less than 20 W Dimension(W * D * H) 361 x 409 x 294.5 mm Weight 12.4 Kg/27.
Specifications ML-1650 Environment Operation Environment Temperature Storage Environment 10 ~32˚c (50˚F ~ 90˚F) Humidity 20 ~ 80 % RH Temperature -200 ~40˚c (4˚F ~ 104˚F) Humidity 10 ~90 % RH Network Operating Systems ML-1651N Windows 95/98 and Windows NT (3.51, 4.x ) Netware (3.x, 4.
Disassembly and Reassembly 3. Disassembly and Reassembly 3-1 General Precautions on Disassembly When you disassemble and reassemble components, 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 removing any component from the machine, note the cable routing that will be affected.
Disassembly and Reassembly 3-2 Transfer Roller 1. Open the printer cover. 3. Hold the cap at the both end of the roller, then remove the roller. 2. Remove the cap.
Disassembly and Reassembly 3-3 Controller Board 1. Remove two screws and remove the controller cover. Samsung Electronics 2. Remove five screws securing the board and unplug all connectors, and then take the controller board out of the printer.
Disassembly and Reassembly 3-4 Pickup Assembly 1. Turn the printer upside down. Remove four screws, then remove the bar cross bottom. 4. Take the assembly out. Push the solenoid if you have difficulty to remove the pickup assembly. 2. Remove three screws from the left base bracket, and take the bracket out. 5. Check the pickup rubber wear. If the rubber is heavily worn, replace it with a new one. 3. Remove four screws securing the pickup assembly. Squeeze this tab to remove the rubber.
Disassembly and Reassembly 3-5 Main Cover 1. Remove two screws and remove the controller cover. 4. Remove two screws securing the main cover. 2. Remove two screws at the back of the printer and unplug one connector from the board, then open the rear cover. 5. Unlatch the front ends of the cover. 3. Open the printer cover, and open the MP tray. |6. Slide the main cover upward, out of the printer. Note that the power switch and the power connecter are properly released when you remove the cover.
Disassembly and Reassembly 3-6 MP (Multi-Purpose) Tray 1. Before you remove the MP tray, you should remove: -Main Cover (see page 3-5) 2. Remove the stoppers securing the MP tray. 3-7 Exit Assembly 1. Before you remove the exit assembly, you should remove: 3. If you want to remove the roller shaft, unlatch both ends of the shaft and take it out. -Main Cover (see page 3-5) 2. Remove the exit tray in the direction of arrow. 4.
Disassembly and Reassembly 3-8 LSU 1. Before you remove the LSU, you should remove: -Main Cover (see page 3-5) -Exit assembly (see page 3-7) 2. Remove five screws, and remove the LSU. Then unplug two connectors from the LSU. 3-9 HVPS board 1. Before you remove the HVPS board, you should remove: -Main Cover (see page 3-5) 2. Remove four screws and take the HVPS board out.
Disassembly and Reassembly 3-10 Fan 1. Before you remove the fan, you should remove: -Main Cover (see page 3-5) 3. Remove one screw, and remove the fan. Then unplug one connector. 2. Remove two screws securing the connector cover and harness bracket from the gear bracket. 3-11 Solenoid 1. Before you remove the solenoid, you should remove: -Main Cover (see page 3-5) 2. Remove two screws, and remove the solenoid. Then unplug one connector.
Disassembly and Reassembly 3-12 Drive Assembly 1. Before you remove the drive assembly, you should remove: -Main Cover -Fan (see page 3-5) (see page 3-9) 4. If you want to remove the step motor, remove four screws securing the step motor from the motor bracket and unplug two connector from the motor. 2. Remove four screws securing the drive assembly from the gear bracket and unplug one connector from the motor, and then take the drive assembly out. 3.
Disassembly and Reassembly 3-13 Fuser Assembly 1. Before you remove the fuser, you should remove: ♦ To remove the thermistor from the fuser assembly : -Main Cover (see page 3-5) Remove one screw, and release the wire from the three holders, and then take the thermistor out. 2. Remove four screws and unplug one connector, and then remove the fuser assembly.
Disassembly and Reassembly 3-14 Guide Feed & Erase Lamp 1. Before you remove the guide feed & PTL, you should remove: 4. Remove the guide feed& erase PTL. -Main Cover (see page 3-5) 2. Release the latches on the erase lamp from the MPF ASS’Y and unplug one connector, then remove the PTL. 3. Remove three screws and raise the guide feed in the direction of arrow.
Disassembly and Reassembly 3-15 MPF Assembly and Miscellaneous on MPF Assembly 1. Before you remove the MPF assembly, you should remove: -Main Cover (see page 3-5) ♦ To replace the nockup plate : 1. Turn the gear shown in the square in the direction of arrow to release the nockup plate. 2. Unplug two connectors and remove five screws, and then take the MPF assembly out. 2. Remove the spring , then release the right end of the plate. ♦ To replace the pickup roller : 1. Remove the e-ring. 3.
Disassembly and Reassembly ♦ To replace the Paper Empty (PE) sensor : ♦ To replace the pickup holder and the Adjust End MP: 1. Release the wire from the two holders. 1. Remove two screws and remove the MPT bracket. 2. Raise the pickup holder in the direction of arrow. 2. Unlatch the PE sensor, then take it out. 3. Remove the pickup holder. 4.
Disassembly and Reassembly 3-16 Engine Board and Miscellaneous 1. Before you remove the engine board, you should remove: 4. While you push the latch to release the PCU shield, take the PCU shield out of the printer. -Main Cover (see page 3-5) 2. Remove six screws from the left and the right base bracket and take them out. 3. Remove eight screws securing the PCU shield and remove two screws securing the SCF connector, and then take the PCU shield out of the printer. 3-14 5.
Disassembly and Reassembly ♦ To replace the exit board : Unplug one connector from the controller board and remove one screw securing the board. Then release the wire from two holders and take the board out. ♦ To replace the fuser sensor : Remove two screws and take it out. Samsung Electronics ♦ To replace the Cap sensor : Remove two screws and take it out. ♦ To replace the actuator empty : Take the sensor out while you squeeze the both ends of the sensor.
Disassembly and Reassembly ♦ To replace the actuator feed 1. Turn the mechanism back and push down the points as shown to unlatch the actuator feed. ♦ To remove the transfer guide : Remove three screws and take the guide out. 2. Turn the unit over again, and remove the actuator feed.
Troubleshooting 4. Troubleshooting 4-1 How to use DCU 4-4 The cause and solution of the malfunction 4-1-1 DCU Setup ......................................Page(4-2) 4-4-1 All LEDs blinking (Fuser Error)........Page(4-17) 4-1-2 Code ................................................Page(4-2) 4-4-2 All LEDs blinking (SCAN ERROR) .Page(4-17) 4-1-3 Self Diagnostic Mode......................Page(4-3) 4-1-4 Self Test Button ................................
Troubleshooting 4-1 How to use DCU 4-1-1 DCU Setup You can examine the malfunction of the printer. To perform DCU, open the front discharge cover and leave the connect the harness wire(10 pin/4 pin) to the CN10(4 pin) of the Main control board. 4-1-2 Code Connect DCU to the printer and turn the power on. It show 7 LED on the panel and each code tells the function of the printer.
Troubleshooting 4-1-3 Self Diagnostic Mode If Error code occurs due to malfunction of the printer, perform Self Diagnostic Mode to solve the problem. The printer works only in the self-test mode to solve the malfunction problem. To enter the self-test mode, turn the power on pressing the buttons of [Down], [Shift] and [Stop] at the same time. Release the button within 2 or 3 seconds if 78 shows in the DCU.
Troubleshooting 13 THV(+) TRIGGER. ALL HV : All high voltage output by each HV terminal and LSU and the fan is in operation. In this mode, electronic resistance of transfer roller and high voltage is detected. 14 +7P Clutch Test : Same method of the code ‘06’. 15 Fan Test : Indicates the function of the fan, same method of the code ‘06’. 16 Paper size Sensor Test : Cassette Sensor 1 ON/OFF Cassette Sensor 2 ON/OFF Cassette Sensor 3 ON/OFF Increment DCU Code No.
Troubleshooting 4-1-6 DCU Panel ML-1650 DIAGNOSTIC CONTROL UNIT QUICK REFERANCE 04 BIAS 3 BIAS 1 BIAS 0 05 LSU READY LSU MT&LD LSU MOTOR 07 PAPER EMPTY SCF MP SELF 08 CRU FEED SENSOR TEST EXIT SENSOR 09 COVER OPEN COVER COVER OUT BIN STATUS 10 COER HEAT DIAGNOSTIC ON DIAGNOSTIC CODE PRINT HEAT STANDBY HEAT OFF STATUS CODE 00 01 02 03 04 05 06 07 08 09 10 11 MAIN MOTOR OPERATION MAIN HIGH VOLTAGE ON TRNSFER HIGH VOLTAGE (-)ON THV(+) REFERANCE VOLTAGE DEV/SUPPLY VOLTAGE ON LSU OPERAT
Troubleshooting 4-2 The cause and solution of Bad image 4-2-1 Vertical Black Line and Band • Description Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer 1. Straight thin black vertical line occurs in the printing. 2. Dark black vertical band occur in the printing. Check and Cause Solution 1. Damaged develop roller in the Developer. Deformed Doctor-blade or cleaningblade. 1. If causes 1 and 2 occur in the developer cartridge, replace the developer and try to print out.
Troubleshooting 4-2-3 Horizontal Black Band • Description Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer 1. Dark or blurry horizontal stripes occur in the printing periodically. (They may not occur periodically.) Check and Cause Solution 1. Bad contacts of the voltage terminals to developer. 1. Clean each voltage terminal of the Charge, Supply, Develop and Transfer roller. (remove the toner particles and paper particles) 2. The rollers of developer may be stained.
Troubleshooting 4-2-5 Light Image • Description Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer The printed image is light, with no ghost. Check and Cause Solution 1. Develop roller is stained when the toner of developer cartridge is almost consumed. 1. Check if the Toner Save mode is off. 2. Ambient temperature is below than 10°C. 2. No 1 : Replace the developer cartridge and try to print out. 3.
Troubleshooting 4-2-7 Uneven Density • Description Print density is uneven between left and right. Check and Cause Solution 1. The pressure force on the left and right springs of the transfer roller is not even, the springs are damaged, the transfer roller is improperly installed, or the transfer roller bushing or holder is damaged. 1. Replace both the left and right Spring Holder. 2. The life of the Developer has expired. 2.
Troubleshooting 4-2-9 Ghost (1) • Description 96 mm Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Ghost occurs at 96 mm intervals of the OPC drum in the whole printing. Check and Cause Solution 1. Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the electrode of the Developer. 1. Clean the terminals when contaminated by toner particles. 2.
Troubleshooting 4-2-11 Ghost (3) • Description Check and Cause Digital Digital Printer Printer Solution 1. The life of the developer may be expired. 1. Occur in the developer cartridge, replace the developer and try to print out. 2. The abnormal voltage and bad contact of the terminal of the supply roller 2. Check the approved voltage of the supply roller and contact of the terminal and adjust if necessary. 47.
Troubleshooting 4-2-14 Satins on Back of Page • Description Check and Cause Solution 1. Transfer roller is contaminated. 1. Perform the OPC Cleaning Mode Print 2 or 3 times. Run Self-Test to remove the contamination of the transfer roller. 2. Pressure roller is contaminated. 2. Replace the transfer roller if contaminated severely. 56.1 mm Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer The back of the page is stained at 56.1 mm intervals. 3.
Troubleshooting 4-3 The cause and solution of the bad discharge 4-3-1 Wrong Print Position • Description Printing begins at wrong position on the paper. Check and Cause Solution Wrong sense time caused by defective feed sensor actuator. Replace the defective actuator EXIT2 FACE DOWN OUT BIN FULL SEN 4-3-2LSU JAM 0 FACE UP CARTRIDGE FUSER H/R FEED SEN EXIT1 IDLE MPF • Description Pr/R FEED TR PICK UP EMPTY SEN 1. Paper is not exited from the cassette. 2.
Troubleshooting EXIT2 OUT BIN FULL SEN FACE DOWN LSU FACE UP CARTRIDGE FUSER H/R 4-3-3 JAM 1 EXIT1 IDLE Pr/R MPF FEED TR PICK UP EMPTY SEN • Description 1. Recording paper is jammed in front of or inside the fuser. 2. Recording paper is stuck in the discharge roller and in the fuser just after passing through the Actuator-Feed. Check and Cause EXIT SEN EXIT SEN Solution 1. If the recording paper is jammed in front of or inside the fuser. (Perform DCU diagnostic code of) 1.
Troubleshooting 4-3-5 Multi-Feeding • Description Multiple sheets of paper are fed at once. Check and Cause Solution 1. Solenoid malfunction(the solenoid does not work properly): Perform DCU mode : solenoid check 06. 1. Replace the solenoid if necessary. 2. Pad-Friction is contaminated with foreign matter.(oil...) 2. Clean the pad friction with soft clothe dampened with IPA(Isopropyl Alcohol). 3. The face of paper is blended. 3. Use the smooth paper.
Troubleshooting 4-3-7 OPC • Description Paper is rolled up in the OPC. Check and Cause Solution 1. Paper is too much thin. 1. Recommend to use normal paper. 2. The face of paper is curled. 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 IPA(Isopropyl Alcohol) or tissue.
Troubleshooting 4-4 The cause and solution of the malfunction 4-4-1 All LEDs blinking (Fuser Error) • Description 1. All the lamps on the operator panel blink. 2. Gear of the fuser does not work and breaks away melt away. When printing, motor breaks away from its place due to defective fuser gear. Check and Cause Solution 1. Check if the thermostat, AC wire and Heat Lamp is open. 1. If the thermostat is open replace the fuser and check following items. 2. Check if the thermistor sensor is in place.
Troubleshooting 4-4-3 Not function of the gear of the fuser due to melting away • Description The motor breaks away from its place due to gear melting away. Check and Cause DCU Mode : Check if the Error States '60' '62' '68' occur. Check the operation of Fuser Erasing Lamp On/Off with the Error Code Check -10-. Solution 1. Replace the Fuser. 2. Replace the Main Control board. 4-4-4 Paper Empty • Description The paper lamp on the operator panel is on even when paper is loaded in the cassette.
Troubleshooting 4-4-6 Cover Open • Description 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. 1. Replace the hook lever, if defective. 2. Check the connector (CN1 : Engine B’d↔HVPS) and circuit of the cover switch department in the Main Control board. Perform DCU mode : If Error state '64' occurs, Check the related codes of the Cover Open Error. 2. Check the insertion of the Cover Open S/W Connect. 3.
Troubleshooting 4-4-8 Defective motor operation • Description Main motor is not driving when printing, and paper does not feed into the printer, resulting 'Jam 0'. Check and Cause Solution 1. Motor harness or sub PCB may be defective. 1. Check the motor harness, replace it, if defective. 2. Perform DCU diagnostic code 00 and Check the motor operation. 2. Replace the SMPS, if necessary. 4-4-9 No Power • Description When system power is turned on, all lamps on the operator panel do not come on.
Troubleshooting 4-4-10 Vertical Line Getting Curved • Description When printing, vertical line gets curved. Check and Cause 1. If the supply of +24v is unstable in the Main Control board linking with LSU, check drive by DCU Mode: LSU Check -05- LSU Motor on. Solution 1. Replace LSU. 2. Replace the Main Control board.
Troubleshooting 4-5 Toner Cartridge Service It is not guaranteed for the default caused by using other toner cartridge other than the cartridge supplied by the Samsung Electronic or caused by non-licensed refill production. 4-5-1 Precautions on Safe-keeping of Toner Cartridge Excessive exposure to direct light more than a few minutes may cause damage to the cartridge.
Troubleshooting 4-5-4 Signs and Measures at Poor toner cartridge Fault Light image and partially blank image (The life is ended.) Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Signs Cause & Check • The printed image is light or unclean and untidy. 1. If the image is light or unclean and untidy printed image Shake the developer and then recheck. • Some part of the (1)NG: Check the weight of the image is not printdeveloper ed.
Troubleshooting Fault White Black spot Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Signs Cause & Check 1. If light or dark periodical black dots occur, this is because the developer rollers are contaminated with foreign substance or paper particles. • White spots occur in the image period- (1)38.5mm interval : Charged roller ically. (2)96mm interval : OPC cycle • Light or dark black dots on the image occur periodically. 2.
Troubleshooting Fault Ghost & Image Contamination Signs Cause & Check Solution • The printed image is too light or dark, or partially contaminated black. 1. The printed image is too light or dark, or partially contaminated black. (1)Check whether foreign substance or toner are stuck to the terminal(point of contact) of the developer. (2)Check whether the terminal assembly is normal. 1. All of 1, 2, 3 above (1)Remove toner and foreign substances adhered to the contact point of the developer.
Troubleshooting 4-6 The cause and solutions of bad environment of the software 4-6-1 The printer is not working (1) • Description While Power turned on, the printer is not working in 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. 1.Check the power of the printer and perform the SelfTest. If the test printing works, that means no problems in the printer itself.
Troubleshooting 4-6-2 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 1. Secure more space of the hard disk. 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.
Troubleshooting 4-6-3 Abnormal Printing • Description 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 defective or wrong setup in the CMOS Setup. 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.
Troubleshooting 4-6-4 SPOOL Error • Description To spool which stands for "simultaneous peripheral operations online" a computer document or 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 1. Insufficient space of the hard disk in the directory assigned for the basic spool. 1.
Exploded Views and Parts List 5. Exploded Views and Parts List • Deal drawings and service parts are declared for the items with higher rate of inferiority and replaceable in the level of service description only. • If inferiority occurs, you can replace the parts by the unit declared in deal drawings and service items. Way to observe Part Code & Description Part code and Description is quoted and controlled by determined standard. Refer to this determined standard, it will help with ordering Part.
Exploded Views and Parts List 5-1 Exploded Views and Parts List • Service Parts List NO.
Exploded Views and Parts List 1 1 ELA HOU-HOUSING HAWK16 ML-1650/XAA JC96-01590V ML-1651N/XAA JC96-02235A ML-1650/XEF JC96-01590W ML-1651N/XEF JC96-01590Z ML-1651N/XEC JC96-01590X ML-1650/XEG JC96-01590V ML-1651N/XG JC96-02235A ML-1650/XET JC96-01590V ML-1651N/XET JC96-02235A ML-1650/XEU JC96-01590V ML-1651N/XEU JC96-02235A ML-1650/XIL JC96-01590Y ML-1651N/XIL JC96-02275B ML-1651N/XIP JC96-02235A PMO-COVER MAIN 1-7 1-1 JC72-00330U JC72-0030W JC72-00330V JC72-00330X JC72-00330Y JC72-00330U JC72-00330W J
Exploded Views and Parts List 5-2 All Exploded Views and Parts List 5-2-1 Cover Exploded View NO.
Exploded Views and Parts List 5-2-2 Frame Exploded View NO.
Exploded Views and Parts List 5-2-3 Exit Exploded View NO.
Exploded Views and Parts List 5-2-4 Rack-MPF Exploded View NO.
Exploded Views and Parts List 5-2-5 Fuser Exploded View 2 4 0 37 7 10 36 12 3 1 1 12 NO.
Exploded Views and Parts List 5-2-6 Drive Exploded View NO. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Description ELA UNIT-MOTOR MOTOR-STEP 7.5_DEG MOTOR-STEP 7.
Exploded Views and Parts List 5-2-7 Pick-Up Exploded View NO.
Exploded Views and Parts List 5-2-8 Cassette Exploded View NO.
6. Block Diagram 6-1 Video ControllerBlock Diagram DAT A(0:31) 32 ROM ADD R(2:22) 100PIN DIM M ADD R( 0:31) 21 DATA(0:31) A 20 29LV 160 16Mbit Flash Memory 29LV 160 32 Regulator 2.
Block Diagram 6-2 Engine Block Diagram A0 - A15 PROGRAM MEMORY (27C512) HVPS control ADC • THV READ • THV / MHV / DEV PWM PWM D0 - D7 STEP MOTR DRIVER (TEA3718 for Main Motor & 2916 for Sub-Motor) SENSOR Feed_Sensor Cover_Open SCF_RDY P_Empty P_Exit MP_Empty Output_Full Fuser_SW -------------------Size1 Size2 Size3 D_T_Sensor DET_CRU A0 74HC245 74HC245 A8 CPU (KS88C4616) SOLENOID DRIVE • MAIN CLUTCH • MP CLUTCH 11.
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