Instruction/ maintenance manual of the product ML-1651N Samsung
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SERVICE LASER PRINTER ML-1650Series ML-1650 / ML-1651N Manual LASER PRINTER CONTENTS 1. Precautions 2. Specifications 3. Disassembly and Reassembly 4. T roubleshooting 5.
© Samsung Electronics Co.,Ltd. September 2001 Printed in Korea. VERSION NO. : 2.00 CODE : JC-0055A This service manual is also provided on the web, the ITSELF system f Samsung Electronics Co.
This manual is stated and provided for service description. All rights reserved. Any parts of the information in this manual are pr ohibited from fr ee duplication, use or translation without prior written approval except in cases allowed by the Copyright Act.
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 Samsung Electronics 1-2 Precautions on Disassembly and Reassembly V ery careful precautions should be taken when replacing parts. Before replacing, please check cables because you cann.
Precautions 1-3 Samsung Electronics 1-3 T ools for T roubleshooting The following tools are recommended for safe and smooth troubleshooting described in this service manual. DCU(Diagnostic Control Unit) Standard: T est equipment to diagnose the Laser printer supplied by Samsung Electronics.
17 PPM(Letter) , 16PPM(A4) 1200 * 1200 T ray 1 : Less than 14 seconds T ray 2 : Less than 17 seconds Less than 40 seconds Print : 300 W , Sleep mode : Less than 20 W 361 x 409 x 294.
Specifications 2-2 Samsung Electronics 10 ~32 ˚ c (50 ˚ F ~ 90 ˚ F) 20 ~ 80 % RH -200 ~40 ˚ c (4 ˚ F ~ 104 ˚ F) 10 ~90 % RH Windows 95/98 and Windows NT (3.
Disassembly and Reassembly 3-1 Samsung Electronics 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.
1. Open the printer cover . 2. Remove the cap. 3. Hold the cap at the both end of the roller , then remove the roller . Disassembly and Reassembly 3-2 Samsung Electronics 3-2 T ransfer Roller.
Disassembly and Reassembly 3-3 Samsung Electronics 1. Remove two screws and remove the controller cover . 2. Remove five screws securing the board and unplug all connectors, and then take the controller board out of the printer .
1. T urn the printer upside down. Remove four screws, then remove the bar cross bottom. 2. Remove three screws from the left base bracket, and take the bracket out. 3. Remove four screws securing the pickup assembly . 4. T ake the assembly out. 5. Check the pickup rubber wear .
Disassembly and Reassembly 3-5 Samsung Electronics 1. Remove two screws and remove the controller cover . 2. Remove two screws at the back of the printer and unplug one connector from the board, then open the rear cover . 3. Open the printer cover , and open the MP tray .
1. Before you remove the exit assembly , you should remove: -Main Cover (see page 3-5) 2. Remove the exit tray in the direction of arrow . 3. If you want to remove the roller shaft, unlatch both ends of the shaft and take it out. 4. If you want to remove the exit roller , squeeze the bottom of the roller and take it out.
Disassembly and Reassembly 3-7 Samsung Electronics 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. 3-8 LSU 1.
Disassembly and Reassembly 3-8 Samsung Electronics 1. Before you remove the fan, you should remove: -Main Cover (see page 3-5) 2. Remove two screws securing the connector cover and harness bracket from the gear bracket. 3. Remove one screw , and remove the fan.
Disassembly and Reassembly 3-9 Samsung Electronics 1. Before you remove the drive assembly , you should remove: -Main Cover (see page 3-5) -Fan (see page 3-9) 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.
Disassembly and Reassembly 3-10 Samsung Electronics 1. Before you remove the fuser , you should remov e: -Main Cover (see page 3-5) 2. Remove four screws and unplug one conne- ctor , and then remove the fuser assembly . ♦ T o remove the thermostat from the fuser assembly Remove two screws and take the thermostat out.
Disassembly and Reassembly 3-11 Samsung Electronics 1. Before you remove the guide feed & PTL, you should remove: -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.
Disassembly and Reassembly 3-12 Samsung Electronics 1. Before you remove the MPF assembly , you should remove: -Main Cover (see page 3-5) 2. Unplug two connectors and remove five screws, and then take the MPF assembly out. ♦ T o replace the pickup roller : 1.
Disassembly and Reassembly 3-13 Samsung Electronics ♦ T o replace the Paper Empty (PE) sensor : 1. Release the wire from the two holders. 2. Raise the pickup holder in the direction of arrow . ♦ T o replace the pickup holder and the Adjust End MP: 1.
Disassembly and Reassembly 3-14 Samsung Electronics 1. Before you remove the engine board, you should remove: -Main Cover (see page 3-5) 2. Remove six screws from the left and the right base bracket and take them out.
Disassembly and Reassembly 3-15 Samsung Electronics ♦ T o 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. ♦ T o replace the fuser sensor : Remove two screws and take it out.
Disassembly and Reassembly 3-16 Samsung Electronics ♦ T o replace the actuator feed 1. Turn the mechanism back and push down the points as shown to unlatch the actuator feed. 2. T urn the unit over again, and remove the actuator feed. ♦ T o remove the transfer guide : Remove three screws and take the guide out.
T roubleshooting 4-1 Samsung Electronics 4. T roubleshooting 4-1 How to use DCU 4-1-1 DCU Setup ......................................Page(4-2) 4-1-2 Code ................................................Page(4-2) 4-1-3 Self Diagnostic Mode ...........
T roubleshooting 4-2 Samsung Electronics 4-1 How to use DCU 4-1-1 DCU Setup Y ou can examine the malfunction of the printer . T o 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.
T roubleshooting 4-3 Samsung Electronics 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.
T roubleshooting 4-4 Samsung Electronics 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 T est : Same method of the code ‘06’.
T roubleshooting 4-5 Samsung Electronics 4-1-6 DCU Panel ML-1650 DIAGNOSTIC CONTROL UNIT QUICK REFERANCE 04 05 07 08 09 10 BIAS 3 LSU READY P APER EMPTY CRU COVER OPEN COER HEA T BIAS 1 LSU MT&LD .
T roubleshooting 4-6 Samsung Electronics 4-2 The cause and solution of Bad image 4-2-1 V ertical Black Line and Band • Description 1. Straight thin black vertical line occurs in the printing.
T roubleshooting 4-7 Samsung Electronics 4-2-3 Horizontal Black Band • Description 1. Dark or blurry horizontal stripes occur in the printing periodically . (They may not occur periodically .) Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Check and Cause Solution 1.
T roubleshooting 4-8 Samsung Electronics 4-2-5 Light Image • Description The printed image is light, with no ghost. Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Check and Cause Solution 1. Develop roller is stained when the toner of developer cartridge is almost con- sumed.
T roubleshooting 4-9 Samsung Electronics 4-2-7 Uneven Density • Description Print density is uneven between left and right. Check and Cause Solution 1.
T roubleshooting 4-10 Samsung Electronics 4-2-9 Ghost (1) • Description Ghost occurs at 96 mm intervals of the OPC drum in the whole printing. Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer 96 mm Check and Cause Solution 1.
T roubleshooting 4-11 Samsung Electronics 4-2-1 1 Ghost (3) • Description White ghost occurs in the black image printing at 51mm intervals. Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer 47.1 mm Check and Cause Solution 1.
T roubleshooting 4-12 Samsung Electronics 4-2-14 Satins on Back of Page • Description The back of the page is stained at 56.1 mm intervals. Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer 56.1 mm Check and Cause Solution 1.
T roubleshooting 4-13 Samsung Electronics 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 .
T roubleshooting 4-14 Samsung Electronics 4-3-4 JAM 2 • 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.
T roubleshooting 4-15 Samsung Electronics 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. 2. Pad-Friction is contaminated with foreign matter .
T roubleshooting 4-16 Samsung Electronics 4-3-7 OPC • 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.
T roubleshooting 4-17 Samsung Electronics 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 .
T roubleshooting 4-18 Samsung Electronics 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 Solution DCU Mode : Check if the Error States '60' '62' '68' occur .
T roubleshooting 4-19 Samsung Electronics 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. 2. Check the connector (CN1 : Engine B ’ d ↔ HVPS) and circuit of the cover switch department in the Main Control board.
T roubleshooting 4-20 Samsung Electronics 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.
T roubleshooting 4-21 Samsung Electronics 4-4-10 V ertical Line Getting Curved • 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 DCU Mode: LSU Check -05- LSU Motor on.
T roubleshooting 4-22 Samsung Electronics 4-5 T oner 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.
T roubleshooting 4-23 Samsung Electronics 4-5-4 Signs and Measures at Poor toner cartridge Fault Signs Cause & Check Solution Light image and partially blank image (The life is ended.) T oner Contamination • The printed image is light or unclean and untidy .
T roubleshooting 4-24 Samsung Electronics Fault Signs Cause & Check Solution White Black spot Recycled product • Light or dark black dots on the image occur periodically . • White spots occur in the image period- ically . • Poor appearance of the developer .
T roubleshooting 4-25 Samsung Electronics Fault Signs Cause & Check Solution Ghost & Image Contamination • The printed image is too light or dark, or partially contami- nated black. • T otally contaminat- edblack. (Black image print- ed out) • The density of print- outs is too dark and ghost occurs.
T roubleshooting 4-26 Samsung Electronics 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.
T roubleshooting 4-27 Samsung Electronics 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.
T roubleshooting 4-28 Samsung Electronics 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 defec - tive or wrong setup in the CMOS Setup.
T roubleshooting 4-29 Samsung Electronics 4-6-4 SPOOL Error • Description T o spool which stands for "simultaneous peripheral operations online" a computer document or task list (or ".
Exploded Views and Parts List 5-1 Samsung Electronics 5. Exploded V iews 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 .
Exploded Views and Parts List 5-2 Samsung Electronics O : Service available X : Service not available 5-1 Exploded Views and Parts List NO. DESCRIPTION SEC CODE Q’TY SA REMARK • Service Parts List.
Exploded Views and Parts List 5-3 Samsung Electronics 13 12 17 2 20 15 11 22 10-1 10-2 10-3 10-4 10 18 5-3 5-1 5-2 5 3 8 8-1 3-1 3-2 19 19-2 19-3 19-1 19-1 6 4 14 19-3 1 7 21 16 16-1 16-2 16-3 16-4 16.
Exploded Views and Parts List 5-4 Samsung Electronics 5-2 All Exploded Views and Parts List 1-10 1-2 1-13 1-7 1-9 1-4 1-6 1-5 1-3 1-3 1-12 1-1 1 1 1-1 1-8 3-4 3-6 3-7 3-5 3-1 3-2 3-3 3-7 3 3-3-1 5-5 5-3 5-1 5-4 5-2 5 4 6 6 4-2 4-1 4-3 0 1 2 5-2-1 Cover Exploded View NO.
9 43 42 23 22 22-4 22-3 22-2 22-1 34 11 8 19 5 19-2 19-1 47 45 46 48 46 50 51 18 18-1 18-2 38 36 20 37 10 41 27 24-2 24-1 25 24 25-2 25-1 27 31-3 31-2 31-1 30-2 30-1 35 53 32-1 32-2 32 28 33 49 31 30 .
Exploded Views and Parts List 5-6 Samsung Electronics 5-2-3 Exit Exploded View 16 19 18 17 16 15 14 13 9 7 8 6 5 12 10 11 4 2 3 1 0 NO. Description Q’ty 0 MEA RACK-HOU EXIT 1 1 PMO-FRAME REAR 1 2 GE.
Exploded Views and Parts List 5-7 Samsung Electronics 5-2-4 Rack-MPF Exploded View 25 3 18 15 17 18 16 9 19 26 22 13 7 24 1 6 14 21 20 4 10 2 12 11 16 8 0 25 NO.
Exploded Views and Parts List 5-8 Samsung Electronics 5-2-5 Fuser Exploded View 38 27 26 24 23 22 21 25 18 20 19 28 35 34 30 29 33 31 32 17 16 15 14 1 13 9 11 1 12 10 3 5 8 1 6 7 37 36 4 2 0 12 NO.
Exploded Views and Parts List 5-9 Samsung Electronics 5-2-6 Drive Exploded View 1 2 3 4 5 6 7 8 9 10 11 13 0 NO. Description Q’ty 0 ELA UNIT -MOTOR 1 1 MOTOR-STEP 7.
Exploded Views and Parts List 5-10 Samsung Electronics 5-2-7 Pick-Up Exploded View 22 4 20 17 16 10 10 15 1 10 15 3 19 6 18 21 5 13 2 14 23 5 2 26 24 25 5 2 7 12 9 11 5 2 0 8 NO.
Exploded Views and Parts List 5-11 Samsung Electronics 5-2-8 Cassette Exploded View 0 2 9 6 8 24 13 14 20 10 4 18 1 7 3 16 12 5 17 19 11 21 15 25 22 NO.
6. Block Diagram 6-1 Video ControllerBlock Diagram 6-1 22 AD D R ( 0 : 3 1 ) 29LV 160 16M bi t F l ash M emor y Mas k F ont R O M K3P5V 100 0D - G C , H i gh ROM 29LV 160 16M bi t Flas h Memor y Mask .
6-2 Engine Block Diagram 6-2 Block Diagram CP U (K S 8 8 C 4 6 1 6 ) 11.59158M H z PR O GR A M ME M O R Y (27C 512) 74H C 245 VI D E O CO NTRO L L E R In te r f a ce HV P S c o n t r o l AD C PW M STE.
7. Connection Diagram 7-1 in t he C RU 1- G N D5 2- + 5V 3- G N D5 4- + 5V 5- G N D5 6- + 3. 3 V 7- G N D2 4 8- + 3. 3 V 9- G N D2 4 10 - 24 V 11 - G ND24 12 - 24 V 13 - G ND24 14 - 24 V 15 - FU S ER .
An important point after buying a device Samsung ML-1651N (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Samsung ML-1651N yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Samsung ML-1651N - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Samsung ML-1651N you will learn all the available features of the product, as well as information on its operation. The information that you get Samsung ML-1651N will certainly help you make a decision on the purchase.
If you already are a holder of Samsung ML-1651N, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Samsung ML-1651N.
However, one of the most important roles played by the user manual is to help in solving problems with Samsung ML-1651N. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Samsung ML-1651N along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
