LASER PRINTER ML-1740/XSH Basic Model : ML-1740 SERVICE LASER PRINTER Manual CONTENTS 1. Precautions 2. Reference Information 3. Specifications 4. Summary of product 5. Disassembly and Reassembly 6. Alignment and Adjustments 7. Troubleshooting 8. Exploded Views and Parts List 9. Block Diagram 10.
ELECTRONICS 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. December 2003 Printed in Korea. VERSION NO. : 1.
2003.
Precautions 1 1. Precautions The cautions in the below are items needed to keep in mind when maintaining and servicing. Please read carefully and keep the contents in mind to prevent accidents while servicing and to prevent that the machine gets damage. 1.1 Warning for safety. (1) Request the service by qualified service person. The service for this machine must be performed by a service person who took the additional education of this field.
Precautions 1.2 Caution for safety 1.2.1 Precaution related noxious material The toner in a printer cartridge contains a chemical material, which might harm human body if it is swallowed. Please keep children out of the toner cartridge. 1.2.2 Precaution related electric shock or fire It is possible to get electric shock or burn by fire if you don't fallow the instructions of the manual. (1) Use exact voltage. Please do use an exact voltage and wall socket.
Precautions 1.2.3 Precaution related handling the machine. If you ignore this information, you could get harm and machine could be damaged. (1) Do not install it on the different levels, or slanted floor. Please confirm whether it is balanced or not after installation. If it is unbalanced, an accident can be happened due to the machine fell over. (2) Be careful not to insert a finger or hair in the rotating unit.
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.
R E F E R E N C E I N F O R M AT I O N 2 2. Reference Information This chapter describes the reference information for applying this training manual, and it is consisted of the tool list, the abbreviation table, the outline of model, and so on. 2.1 Tool 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.
R E F E R E N C E I N F O R M AT I O N 2.2 Acronyms and Abbreviations The table in the below explains abbreviations used in this service manual. The contents of this service manual are declared with abbreviations in many parts. Please refer to the table. AC Alternating Current ASIC Application Specific Integrated Circuit ASSY assembly BIOS Basic Input Output System CMOS Complementary Metal Oxide Semiconductor 2-2 IEEE Institute of Electrical and Electronics Engineers.
R E F E R E N C E I N F O R M AT I O N 2.3 The Sample Pattern for the Test The sample pattern shown in below is the standard pattern used in a factory. The contents of the life span and the printing speed are measured with the pattern shown in below. (The picture in the manual is 70% size of the actual A4 size.) 2.3.
R E F E R E N C E I N F O R M AT I O N 2.3.
R E F E R E N C E I N F O R M AT I O N 2.3.
R E F E R E N C E I N F O R M AT I O N 2-6 Service Manual Samsung Electronics
Specifications 3 3. Specifications Product specifications are subject to change without notice.See below for product specifications. 3.
Specifications 3.2 Controller Specification DESCRIPTION ITEM ML-1710P Processor(CPU) Samsung Jupiter3 90MHz OS Compatibility (1) Windows 98/NT4.0/2000/Me/XP, Various Linux OS including Red Hat, Caldera, Debian, Mandrake, Slackware, SuSE and Turbo Linux Memory FLASH ROM(PROGRAM) : 0.5MB flash 8 MB (ML-1710P) EEPROM(NVRAM) : 512 byte Emulation SPL(Samsung Printer Language) Interface USB 1.
Specifications 3.5 TONER Cartridge (Developer) ITEM Life span DESCRIPTION REMARK Starter: Up to 1,000 sheets IDC 5% pattern Running : Up to 3,000 sheets Developing Non-magnetic Mono Conponent Contact Developing Charging Conductive Roller Charging Toner checking sensor Not Available Ozone 0.
Specifications 3-4 Service Manual Samsung Electronics
S U M M A RY OF PRO D U C T 4 4. Summary of Product This chapter describes the functions and operating principal of the main component. 4.1 Printer Components 4.1.
S U M M A RY OF PRO D U C T 4.1.2 Rear View Rear output tray (Face up) Power receptacle Parallel port USB port 4.1.
S U M M A RY OF PRO D U C T 4.1.3 Control Panel 1) On Line/Error and Toner Save LEDs LED Description If the On Line/Error lights green, the printer is ready to print. If the On Line/Error lights red, the printer is experiencing an error, such as jammed paper, the open cover or the empty toner cartridge. If you press the Cancel button while the printer is receiving data, the On Line/Error LED blinks red to cancel printing.
S U M M A RY OF PRO D U C T 2) Cancel button 4-4 Printing demo page In Ready mode, press and hold this button for about 2 seconds until all LEDs blink slowly, and release. Printing configuration sheet In Ready mode, press and hold this button for about 6 seconds until all LEDs blink fast, and release. Manual feeding Press this button each time you load a sheet of paper in the manual feeder, when you select Manual Feed for Source from your software application.
S U M M A RY OF PRO D U C T 4.
S U M M A RY OF PRO D U C T 4.2.1 Feeding Part There are the universal cassette, which loads papers, and the manual feeder, which supplies paper one by one. The cassette has the function pad which separates paper one by one, and it has the sensor function to check the existence of the loading paper. - Feeding Method: Universal Cassette Type - Feeding Standard: Center Loading - Feeding Capacity: Cassette-250 sheets (75g/m©˜, 20lb paper standard) Manual 1 sheet (Paper, OHP, Envelop, etc.
S U M M A RY OF PRO D U C T 4.2.4.5 Safety Relevant Facts • Protecting device when overheating - 1st protecting device: H/W cuts off when detecting an overheating - 2nd protecting device: S/W cuts off when detecting an overheating - 3rd protecting device: Thermostat cuts off the power • Safety device - The power of the fuser is cut off when the front cover is open.
S U M M A RY OF PRO D U C T 4.2.6 Toner Cartridge By using the electronic photo process, it creates a visual image. In the toner cartridge, the OPC unit and the developer unit are in a body.
S U M M A RY OF PRO D U C T 4.3 Main PBA(SPL Model) The Engine Board and the Controller Board are in one united board, and it is consisted of CPU part and print part in functional aspect. The CPU is functioned as the bus control, I/O handling, drivers, and PC interface. The main board sends the Current Image dlml Video data to the LSU and manages the conduct of Electrophotography for printing.
S U M M A RY OF PRO D U C T 4.3.1 ASIC (Jupiter ) The Jupiter (16Bit RISC Processor), which is the executive controller to operate the printer function, is in use, and the each operation block is driven by system program of the flash memory. The whole system is controlled by driving operation block.
S U M M A RY OF PRO D U C T 3) Paper Feeding, 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 1 sec. after paper is fed, paper Jam0 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.
S U M M A RY OF PRO D U C T 4.4 SMPS & HVPS The SMPS supplies the DC power to the system. It takes 110V/220V and outputs the +3.3V, +5V and +24V to supply the power to the main board and ADF board. The HVPS part creates the high voltage of THV/MHV/Supply/Dev and supplies it to the developer part for making the best condition to display the image.
S U M M A RY OF PRO D U C T 4.4.1 HVPS(High Voltage Power Supply) 1) Transfer High Voltage (THV+) - Function: It is a voltage to transfer a toner developed on OPC drum to a paper. Output voltage: Maximum +5.0KV ±5% (Duty changeable, unload) 1.0KV ±15%(When cleaning, 200MOhm) Error: If THV (+) doesn't output, a ghost status (same character is printed after one cycle (76mm) of OPC) with a low density occurs due to a toner on OPC drum cannot normally transfer to a paper.
S U M M A RY OF PRO D U C T 4.4.2 SMPS(Switching Mode Power Supply) It is the power source for the whole system. It is an independent module, so it is possible to use for common use. It is mounted at the bottom of the set. It is consisted of the SMPS part, which supplies the DC power for driving the system, and the AC heater control part, which supplies the power to fuser. SMPS has three outputting channels (3.3V, +5V and +24V).
S U M M A RY OF PRO D U C T 6) Feature - Insulating resistance : over 50MΩ (at DC500V) Insulating revisiting pressure : Must be no problem within 1min. (at 1500Vzc, 10mA) Leaking voltage : under 3.
S U M M A RY OF PRO D U C T 4.5 Engine F/W 4.5.1 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.
S U M M A RY OF PRO D U C T 4.5.4 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 controlled by comparing the target temperature to the value from the thermistor.
S U M M A RY OF PRO D U C T 4.5.4.3 What is the Q-PID Method? The Q-PID is developed by Samsung, and it saves the preheating time in half in comparison with the existed method. It saves not only the printing time for initial print but also it saves the printing speed for the reattempting print after for a while. Air Layer Holgen Lamp Toner Paper Toner Pressure Roller • After heating the air layer, transfer the heat to the surface • It takes long time to heat it until it reaches the proper temperature.
Disassembly and Reassembly 5 5. Disassembly and Reassembly 5.1 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 5.2 Top Cover 1. Pull the Cassette out of the printer. 4. Unlatch the front ends of the Top Cover. 2. Remove the Front Cover in the direction of arrow. 5. Remove the Top Cover in the direction of arrow. Top Cover Front Cover 3. Remove four screws. 6. Remove the Rear Cover from the Top Cover.
Disassembly and Reassembly 5.3 Fuser 5.3.1 Fuser(Heat Lamp Type) 1. Before you remove the Fuser, you should remove: - Top Cover(see page 5-2) 5. Remove one screw and take the Idle Gear out. Idle Gear 2. Unplug two connectors(Block) from the boards, then remove four screws. Fuser Ass'y 6. Remove four screws and divide the Fuser into two parts Fuser Cover 3. Remove two screws and take the Thermostat out of the Fuser. Thermostat 4. Remove two screws and take the Halogen Lamp out of the Heat Roller. 7.
Disassembly and Reassembly 5.4 Exit Roller 1. Before you remove the Fuser, you should remove: - Top Cover(see page 5-2) Exit Gear Bearing Exit Roller 2.Remove the Exit Gear, Bearing and Exit Roller as shown below 1 2 5.5 LSU 1. Before you remove the Fuser, you should remove: - Top Cover(see page 5-2) 4. Unplug two connector from the LSU 2. Remove two screws and unplug one connector from the Frame. 5. Unplug four screws and take the LSU out. LSU 3. Remove the LED PBA Ass’y as shown below.
Disassembly and Reassembly 5.6 Fan 1. Before you remove the Fuser, you should remove: - Top Cover(see page 5-2) 2. Unplug the connector from the SMPS and remove the one screw. Then take out the Fan. DC Fan 5.7 Driver Ass’y 1. Before you remove the Fuser, you should remove: - Top Cover(see page 5-2) 3. Unplug one connector from the Driver Ass’y Drive Ass'y 2. Remove the six screws from the Drive Ass’y.
Disassembly and Reassembly 5.8 Engine Shield Ass’y 1. Before you remove the Fuser, you should remove: - Top Cover(see page 5-2) - Fuser Connector(see page 5-3) 2. Remove the fourteen screws securing from the Engine Shield Ass’y and unplug the all connectors. Then take the Engine Shield Ass’y. Engine Shield Ass'y 5.9 Main PBA 1. Before you remove the Fuser, you should remove: - Top Cover(see page 5-2) - Engine Shield Ass’y(see page 5-8) Main PBA 2.
Disassembly and Reassembly 5.10 SMPS 1. Before you remove the Fuser, you should remove: - Top Cover(see page 5-2) - Engine Shield Ass’y(see page 5-8) 3. Remove one screw and unplug one connector from the Main PBA. 2. Unplug one connector and remove three screws then take the Inlet Ass’y out. Inlet Bracket 4. Remove three screws and take The SMPS out.
Disassembly and Reassembly 5.11 Transfer Roller 1. Before you remove the Fuser, you should remove: - Top Cover(see page 5-2) - LSU(see page 5-6) 3. Unplug the PTL Holder Connector, then remove the PTL Holder and PTL Lens, as shown below. PTL Holder PTL Lens 2. Remove three screws and take the Transfer Earth out. Transfer Earth 4. Unlatch the Bush and remove it. Then lift the Transfer Roller out, as shown below.
Disassembly and Reassembly 5.12 Feed Roller 1. Before you remove the Fuser, you should remove: - Top Cover(see page 5-2) - Drive Ass’y(see page 5-7) 5. Remove the Idle Gear and Feed Gear2. Feed Gear2 2. Remove two screws from the Guide Paper and take it out. Guide paper Idle Gear 6. Remove the Feed Gear 1 Ass’y, as shown below. 3. Pull up the Feed Idle Bush and Feed Idle Shaft, as shown below. Feed Gear1 Ass'y Feed Idle Shaft Bush 7. Remove the Feed Roller and Feed Roller 1, as shown below. 4.
Disassembly and Reassembly 5.13 Pick Up Roller & Solenoid 1. Before you remove the Fuser, you should remove: - Top Cover(see page 5-2) - Drive Ass’y(see page 5-7) - Engine Shield Ass’y(see page 5-8) 4. Remove the Pick up Ass’y, as shown below. 2. Remove three screws from the Feed Bracket and take it out. Feed Bracket Bush 1 2 Pick up Ass'y 5. Remove two screw then remove The Manual Solenoid and Pick Up Solenoid. 3. Remove the Pick up Gear Ass’y, as shown below.
LIGNMENT & DJUSTMENTS 6 6. 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. 6.1 How to use DCU 6.1.1 DCU Setup You can examine the malfunction of the printer.
LIGNMENT & DJUSTMENTS 6.1.2 Code Connect DCU to the printer and turn the power on. It show 7 Segment FND on the panel and each code tells the function of the printer. 1) Normal Code While printing or warming up, it indicate the position of the paper Code State 61 00~05 Warm up Ready(kind of paper) 20, 21, 22 Print Start 30 40 50 69 Feed Sensor On Feed Sensor off Paper Out Sleep Mode Description The printer is on, the cover is open or close.
LIGNMENT & DJUSTMENTS 6.1.3 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.
LIGNMENT & Code 6-4 DJUSTMENTS Description 07 Paper Empty Sensor Test : If activate the Actuator of the PEMPTY Sensor, the left and right of the three LEDs are on. Paper Empty Sensor ON/OFF 1st LED ON/OFF 08 Feed & Exit Sensor Test Test the Feed sensor and Discharge sensor in the same way as '07'.
LIGNMENT & No.
LIGNMENT & DJUSTMENTS 6.
LIGNMENT & DJUSTMENTS 6.3 Clearing Paper Jams Occasionally, paper can be jammed during a print job. Some of causes include: • The tray is loaded improperly or overfilled. • The tray has been pulled out during a print job. • The front cover has been opened during a print job. • Paper that does not meet paper specifications has been used. • Paper that is outside of the supported size range has been used. If a paper jam occurs, the On Line/Error LED on the control panel lights red.
LIGNMENT & DJUSTMENTS 6.3.2 In the Paper Feed Area (JAM0) 1) Slide out the tray to expose the jammed paper. 2) Remove any missfeed paper by pulling it out by the visible edge from the tray. Make sure that all of the paper is properly aligned in the tray. 3) Slide the tray back into the printer. Open and close the front cover. Printing can be resumed. 6.3.3 Around the Toner Cartridge (JAM1) 1) Open the front cover and remove the toner cartridge 2) Gently pull the paper toward you.
LIGNMENT & DJUSTMENTS 6.3.4 Tips for Avoiding Paper Jams By selecting the correct paper types, most paper jams can be avoided. If a paper jam occurs, follow the steps outlined in • Ensure that the adjustable guides are positioned correctly. • Do not overload the tray. Ensure that the paper is below the paper capacity mark on the right inside of the tray. • Do not remove the paper from the tray while printing. • Flex, fan and straighten the paper before loading.
LIGNMENT & DJUSTMENTS 6.4 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. 6.4.1 Printing a Demo Page Print a demo page or a configuration sheet to make sure that the printer is operating correctly. 1) Hold down the Cancel button for about 2 seconds to print a demo page. Hold down the Cancel button for about 6 seconds to print a configuration sheet.
LIGNMENT & DJUSTMENTS 2) The Demo page or the configuration sheet shows the printer’s current configuration. ML-1740 Series Monochrome Laser Printer DigitAIIperformance Up to 17ppm(Letter)/16ppm(A4) print speed True 600 x 600 dpi print resolution 66NHz processor 8MB Memory 250 sheets paper cassette DigitAIIValue One touch Toner Save Button - expand the life of the toner cartridge by 40% One touch Cancel Button Great Price, Great Performance DigitAIIcompatibility Windows 95/98NT 4.
LIGNMENT & DJUSTMENTS 6.4.2 Printing a cleaning sheet If you are experiencing blurred, faded or smeared printouts. Printing a cleaning sheet cleans the drum inside the toner cartridge. This process will produce a page with toner debris, which should be discarded. 1) Ensure that the printer is turned on and in the Ready mode with paper loaded in the tray. 2) Press and hold down the Cancel button on the control panel for about 10 seconds.
LIGNMENT & DJUSTMENTS 6.5 Consumables and Replacement Parts The cycle period outlined below is a general guideline for maintenance. The example list is for an average usage of 50 transmitted and received documents per day. Environmental conditions and actual use will vary these factors. The cycle period given below is for reference only.
LIGNMENT & DJUSTMENTS 6.7 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 75.5mm white spot on black image or black spot 2 Charge Roller 37.7mm black spot 3 Supply Roller 37.0mm light or dark horizontal image band 4 Developing Roller 35.3mm horizontal image band 5 Transfer Roller 45.
LIGNMENT & DJUSTMENTS Service Manual Samsung Electronics 6-15
T RO U B L E S H O OT I N G 7 7. Troubleshooting 7.1 Bad image 7.1.1 Vertical Black Line and Band • Description 1. Straight thin black vertical line occurs in the printing. 2. Dark black vertical band occur in the printing. Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Check and Cause Solution 1. Damaged develop roller in the Developer. Deformed Doctor-blade or cleaningblade. 1.
T RO U B L E S H O OT I N G 7.1.3 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.
T RO U B L E S H O OT I N G 7.1.5 Light Image • Description The printed image is light, with no ghost. Check and Cause Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer 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. Replace the developer cartridge and try to print out. 3.
T RO U B L E S H O OT I N G 7.1.7 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 toner level is not even on the developer roller due to the bad blade. 2.
T RO U B L E S H O OT I N G 7.1.9 Ghost (1) • Description 75.5mm Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Ghost occurs at 75.5 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.
T RO U B L E S H O OT I N G 7.1.11 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.
T RO U B L E S H O OT I N G 7.1.14 Stains on Back of Page • Description The back of the page is stained at 47 mm intervals. Check and Cause Digital Digital Pri Digital Printer Digital Printer Digital Printer 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. 3.
T RO U B L E S H O OT I N G 7.2 bad discharge 7.2.1 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 7.2.2 JAM 0 L S U Fuser Toner Cartridge CR DR EXIT Sensor OPC PR SR PTL MP Sensor Feed Sensor FR 1. Paper is not exited from the cassette. 2. Jam-0 occurs if the paper feeds into the printer.
T RO U B L E S H O OT I N G 7.2.3 JAM 1 L S U Fuser Toner Cartridge CR DR EXIT Sensor OPC PR SR PTL MP Sensor Feed Sensor FR K /R TR P IC Empty Sensor • 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 Solution 1. If the recording paper is jammed in front of or inside the fuser. (Perform DCU diagnostic code 08) 1. Replace the SMPS.
T RO U B L E S H O OT I N G 7.2.5 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 Diagnostic Code 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. 7.2.
T RO U B L E S H O OT I N G 7.2.7 Paper rolled in the Toner Cartridge (OPC Drum) • 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 in the OPC Drum. • Remove the paper while turning the OPC Drum against the ongoing direction. • C;eam fomger[romts on the OPC Drum spft;u with IPA(Isopropyl Alcohol) or tissue.
T RO U B L E S H O OT I N G 7.3 Malfunction 7.3.1 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. 2.
T RO U B L E S H O OT I N G 7.3.3 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. 7.3.
T RO U B L E S H O OT I N G 7.3.6 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 (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.
T RO U B L E S H O OT I N G 7.3.8 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. 7.3.
T RO U B L E S H O OT I N G 7.3.10 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.
T RO U B L E S H O OT I N G 7.4 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. 7.4.1 Precautions on Safe-keeping of Toner Cartridge Excessive exposure to direct light more than a few minutes may cause damage to the cartridge. 7.4.
T RO U B L E S H O OT I N G 7.4.4 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 image is not printthe developer ed.
T RO U B L E S H O OT I N G 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 (1)37.7mm interval : Charged in the image periodroller ically. (2)75.5mm interval : OPC cycle • Light or dark black dots on the image occur periodically. 2.
T RO U B L E S H O OT I N G 7.5 Bad Environment of The Software 7.5.1 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.
T RO U B L E S H O OT I N G 7.5.2 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.
T RO U B L E S H O OT I N G 7.5.3 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.
T RO U B L E S H O OT I N G 7.5.4 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.
EXPLODED VIEW & PARTS LIST 8 8. Exploded Views and Parts List(ML-1740/XSH) 8-1. Main Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page(8-2) 8-2. Frame Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . page(8-4) 8-3. Drive Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . page(8-7) 8-4. Cassette Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . page(8-8) 8-5. Fuser Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . .
11 8-2 12 11-3 11-2 11-1 11-4 0 10 17 11-5 11-3 13 4 14 6 9 16-1 8 3 16-3 7 16-2 16 18 19 5 20 1 2-2 15 2-8 2-1 2-7 2-5 2-4 2-3 2 2-6 2-6 EXPLODED VIEW & PARTS LIST 8.
EXPLODED VIEW & PARTS LIST Main Assembly Parts List SA : Service Available O : Service available X : Service not available No. Description SEC.
8-4 59-1 54 59-2 59 59-3 50 55 52 59-4 49 49-3 49-1 52 49-2 41 42 62 33 47 40 36 32 58-1 48 35 58-2 29 53 46 1 44 58-3 29 45 28 58-4 30 20 43 58-6 25 23 58-6 58-4 24 58-5 56 Transfer Roller 34 38 9 53 37 58 27 39 6 57 26 31 22 9 5 21 17 19 7 8 12 11 10 18 61 14 60 0 15 6 20 3 13 51 16 4 2 EXPLODED VIEW & PARTS LIST 8.
EXPLODED VIEW & PARTS LIST Frame Unit Assembly Parts List SA : Service Available O : Service available X : Service not available No. Description SEC.
EXPLODED VIEW & PARTS LIST Frame Unit Assembly Parts List(Cont.) SA : Service Available O : Service available X : Service not available No. SEC.
EXPLODED VIEW & PARTS LIST 8.3 Drive Unit Assembly 0 7 6 8 1 9 HARNESS-MOTOR 2 4 5 3 4 5 Drive Unit Assembly Parts List SA : Service Available O : Service available X : Service not available No. Description SEC.
EXPLODED VIEW & PARTS LIST 8.
EXPLODED VIEW & PARTS LIST Cassette Unit Assembly Parts List SA : Service Available O : Service available X : Service not available No.
EXPLODED VIEW & PARTS LIST 8.
EXPLODED VIEW & PARTS LIST Fuser Unit Assembly Parts List SA : Service Available O : Service available X : Service not available No.
EXPLODED VIEW & PARTS LIST 8-12 Service Manual Samsung Electronics
Samsung Electronics SOLENOID PTL F.G IEEE1284 Interface Video Clock + FLASH MEMORY (0.5MB) SDRAM (8MB) ASIC JUPITER3 Controller Block SMPS Block Power On Reset Freq. Spread VOLTAGE DETECTOR MOTOR DRIVER HEATER-AC Crystal 14.74 MHz IN-LET MP-SENSOR P/EMPTY-SENSOR FEED-SENSOR EEPROM Freq. Spread Crystal 10MHz EXIT-SENSOR Main Clock + + FUSER ASS’Y HVPS Block + GND MHV To Controller THV DEV SUPPLY OPC GND Cover-open Switch +24V THVPWM BLASPWM MHVPWM +24V +5V +3.
C O N N E C T I O N D I AG R A M 10 10. Connection Diagram ML-1740 Connection Diagram IEE1284 COMPATIABLE CABLE HOST COMPUTER USB CABLE 36 PIN CN6 1 2 3 4 5 6 7 8 9 10 11 CN8 1 2 CN9 1 2 CN3 1 2 3 CN3 4PIN CONNECTOR for USB CN4 MAIN BOARD FR-4, 2L 1 2 THERMISTOR 1 2 3 4 MOTOR THERM THERM2 A A/ B B/ 1 2 1 2 3 4 CN5 CN7 CN10 DCU 1 2 3 4 3.3V DCU DATA DCU CLK GND 1 2 3 4 UART 1 2 3 4 3.
