LASER PRINTER ML-2250 Series ML-2250/XAA, ML-2251N/XAA, ML-2252W/XAA Basic Model : ML-2210/ML-2251N 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. Connection Diagram 11.
Precautions 1 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.
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.
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.
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 12.
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.
REFERENCE INFORMATION 2 2. 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 included. 2.1 Tool for Troubleshooting The following tools are recommended safe and easy troubleshooting as described in this service manual.
REFERENCE INFORMATION 2.2 Acronyms and Abbreviations 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.
REFERENCE INFORMATION LBP Laser Beam Printer RAM Random Access Memory LCD Liquid Crystal Display ROM Read Only Memory LED Light Emitting Diode SCF/SCT LSU Laser Scanning Unit Second Cassette Feeder/Second Cassette Tray MB Megabyte SMPS Switching Mode Power Supply MHz Megahertz SPGP Samsung Printer Graphic Processor MPBF Mean Prints Between Failure SPL Samsung Printer Language MPF/MPT Multi Purpose Feeder/Multi Purpose Tray Spool Simultaneous Peripheral Operation Online NIC Ne
REFERENCE INFORMATION 2.3 Select a location for the printer • Leave enough room to open the printer trays, covers, and allow for proper ventilation. (see diagram below) 100 mm (3.9 in.) (3.9 in.) 482.6 mm(18.8 in.) 100 mm 954.6 mm(37.5 in.) (3.9 in.
REFERENCE INFORMATION 2.4 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 (5%). The 5% and 2% samples are reproduced reduced to 70% of the actual A4 size. 2.4.
REFERENCE INFORMATION 2.4.
REFERENCE INFORMATION 2.4.
REFERENCE INFORMATION 2.6 Wireless LAN • This product can be used with a wireless LAN, (this is an option.) - The wireless LAN function uses radio technology, instead of using LAN cable, to connect to an access point for printing.
Specifications 3 3. Specifications Product specifications are subject to change without notice.See below for product specifications. 3.
Specifications Item ML-2250 Paper Input Pick-Up Capacity Media Type Media Weight Paper Output Sensor 3-2 Capacity Stacker Offset Output Paper Paper Size Media Type Paper Full ML-2250 Series ML-2251N/ML-2252W Center Feeding Max 550 sheet 1. Cassette : 250 sheet 2. MPF : 50 Sheet (Special Media 5 Sheets) 3.
Specifications 3.2 Controller Specification Item ML-2250 Series ML-2251N/ML-2252W CPU SPGPm 166MHz GEU YES Standard ML-2250: SPL,PCL6(Firmware),EPSON,IBM ProPrinter ML-2250/50G Domestic: SPL, PCL6(Firmware),KS5843,KSSM,KSC5895 Option PostScript 3 with 136 fonts Auto Emulation Sensing YES Standard IEEE1284,USB 2.0 Option Serial : NO , IrDA : NO Auto Interface Sensing YES Standard / Max.
Specifications 3.3 Software Specifications Item ML-2250 OS ML-2250 Series ML-2251N/ML-2252W Compatibility Printer Driver Driver Function WH - Windows 95/98/NT4.
Specifications 3.
Specifications MEMO 3-6 Service Manual Samsung Electronics
Summary of product 4 4. Summary of Product This chapter describes the functions and operating principals of the main components. 4.1 Printer Components 4.1.
Summary of Product 4.1.
Summary of product 4.1.3 Control Panel 1) On Line/Error and Toner Save LEDs LED Description If the On Line/Error light is green the printer is ready to print. If the On Line/Error light is red the printer is experiencing an error such as jammed paper, cover open or 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. In Manual Feed mode if there is no paper in the Manual Feeder the On Line/Error LED blinks red.
Summary of Product 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 quickly and release. Cleaning inside printer In Ready mode press and hold this button for about 10 seconds until all LEDs turn on and release. After cleaning the printer one cleaning sheet is printed.
Summary of product 4.2 System Construction 4.2.1 Summary The ML2250 consists of the following main functional components 1) The Firmware This controls the whole printing process 2) The Print Engine consisting of a) Engine frame b) Paper feed mechanism The paper mechanism cosists of a 250sheet main cassette, multi-purpose paper tray, pickup rollers, friction pads and feed rollers.
Summary of Product 4.2.
Summary of product 4.2.3 Paper Feed This consists of the standard cassette, an optional cassette, an MP tray for supplying different types of media (envelopes, labels, special paper) and other parts related to the movement of paper through the printer. 1) Paper separation method Individual sheets are separated in the cassette using the ‘friction pad’ method. When paper feeds into the machine it passes over a spring loaded friction pad that separates the sheets of paper.
Summary of Product 4.2.6 Fuser There are two methods of fusing toner onto the paper: the existing heat lamp process and the Q-PID process developed by Samsung. ML2250 export models, both 110V and 220V, use the heat lamp process. This consists of a heat lamp, heat roller, pressure roller, thermistor and thermostat. By use of heat and pressure toner is caused to melt and adhere to the paper surface in order to complete the printing process. 4.2.6.
Summary of product 4.2.8 Toner Cartridge The toner cartridge is an integral unit containing the OPC unit and toner unit.
Summary of Product 4.3 Main PBA(SPL Model) The Engine Board and Controller Board have been integrated into a single PBA. This consists of the CPU and printer control functions. The CPU functions as the bus controller, I/O handler, motor driver and PC interface. The main board sends the Current Image Video data to the LSU and manages the Electrophotographic printing process.
Summary of product 4.3.
Summary of Product 4.3.4 SDRAM Used as Swath buffer, System working memory area, etc. when printing. • Capacity: 16MByte (Export) / 32MByte (Domestic), expandable up to 144Mbyte (Export) /160MByte (Domestic) • Optional Additional DIMM : 16MB / 32MB / 64MB /128MB • Type : SDRAM 100MHz/133MHz , 16bit 4.3.5 Sensor Input Circuit 4.3.5.1. Paper Empty Sensing The Paper Empty sensor (Photo Interrupter) on the engine board is monitored by the CPU. When the cassette is empty the printer flashes the red ERROR LED.
Summary of product 4.3.5.9 Transfer The charging voltage, developing voltage and the transfer voltage are controlled by PWM (Pulse Width Modulation). Each output voltage is changeable according to the PWM duty cycle. The transfer voltage used when the paper passes the transfer roller is decided by environment recognition.
Summary of Product 4.4 SMPS & HVPS The SMPS and HVPS are on one integrated board. The SMPS supplies the DC power to the system. It takes either 110V or 220V and outputs the +5V and +24VS supplies to the main and other PBAs. The HVPS creates the high voltage of THV/MHV/Supply/Dev and supplies it to the toner cartridge. The CPU is used to modify some of these voltage settings to provide the ideal voltages to create the image.
Summary of product 4.4.1 HVPS (High Voltage Power Supply) 1) 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,200 MΩ) - Output Voltage Trigger : 6.5 uA - Input contrast of the Voltage stability degree :under ± 5 % (fluctuating input 21.6V~26.
S U M M A RY OF PRO D U C T Summary of Product 4.4.2 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. It is consisted of the AMPS part, 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.
Summary of product 4.5 Engine F/W 4.5.1 Feeding If feeding from the cassette the drive of the pickup roller is controlled by controlling the pick-up solenoid. The on/off of the solenoid is controlled by controlling the general output port or the external output port. If feeding from the manual feeder the set decides to feed 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.
Summary of Product MEMO 4-18 Service Manual Samsung Electronics
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 Front Cover 1. Pull the Cassette out of the printer. 4. Pull the front cover away from the machine. Latch Latch Holder H Cassette Front Cover Latch Holder 2. Open the Front Cover push the toner cartridge down and remove it from the printer. Maintaining Print Quality. • To prevent damage to the toner cartridge, do not expose it to light for more than a few minutes. Front Cover 3.
Disassembly and Reassembly 5.3 MP-Tray Ass’y 1. Open the Tray Ass’y 2. Carefully bend the clear plastic hinge supports ( 1 ) to release them from the guide hooks. Push the Front cover side outwards to release the MP Tray hinge.
Disassembly and Reassembly 5.4 Rear Cover 1. Release two screws and remove the Option Cover Ass’y. 3. Release two screws, as shown below and remove up the “Rear Cover” (release plastic “HOOK” carefully) Rear Cover Rear Open 2. Remove the Cover Face up in the direction of arrow. Cover Face up Use Driver Note. To make Disassembly and Reassembly simpler.
Disassembly and Reassembly 5.5 Top Cover 1. Before you remove the Top Cover Ass’y, you should remove: - Front Cover - Rear Cover 2. Remove four screws securing the Top Cover Ass’y, as shown below. Exit Roller Take Care. When removing or refitting the top cover take care not to damage the Exit Roller.
Disassembly and Reassembly 5.6 Middle Cover 1. Before you remove the Middle Cover, you should remove: - Front Cover - Rear Cover - Top Cover 2. Disconnect the OPE harness and remove four screws securing the Base Frame, as shown below. Middle Cover 5.7 Side Cover(LH, RH) 1. Before you remove the Side Cover(LH, RH), you should remove: - Front Cover - Rear Cover - Top Cover 2. Remove the two screws and release the latches from the Frame Ass’y in the direction of the arrow, then remove the side cover(RH).
Disassembly and Reassembly 5.8 Exit Roller 1. Before you remove the Exit Roller, you should remove: - Front Cover - Rear Cover - Side Cover(LH, RH) - Top Cover 2. Remove the Exit Gear, Bearing and Exit Roller as shown below.
Disassembly and Reassembly 5.9 Engine Shield Ass’y & Exit Board 1. Before you remove the Engine Shield Ass’y, you should remove: - Front Cover - Rear Cover - Side Cover(LH, RH) - Top Cover 4. Remove the two screws and remove the Exit Board. Exit Board 2. Release 1 screw and remove the SMPS shield Engine Shield Ass'y SMPS Shield 3. Remove the twelve screws securing from the Engine Shield Ass'y and unplug the all connectors. Then take the Engine Shield Ass'y.
Disassembly and Reassembly 5.10 SMPS 1. Before you remove the SMPS, you should remove: - Front Cover - Rear Cover - Side Cover(LH, RH) - Top Cover 4. Unplug one connector from the Main PBA. Connector 2. Unplug one connector and remove three screws then take the Inlet Bracket out. Inlet Bracket 5. Remove the six screws and take the Main Board. Main PBA 3. Remove the two screws and remove the Network Board.
Disassembly and Reassembly 6. Remove seven screw and take out the SMPS Unit. 7. If you only need to remove the optional memory modules or the network card this can be chieved by removing ONLY the Option Cover.
Disassembly and Reassembly 5.11 Fuser Ass’y 1. Before you remove the Fuser Ass’y, you should remove: -Rear Cover 4. Remove the two screws securing the Halogen Lamp. Then take out the Halogen Lamp from the Heat Roller, as shown below. 2. Unplug the four connectors from the Main PBA and SMPS, as shown below. Then remove the four screws securing the Fuser Ass’y and remove it. Halogen Lamp Fuser Ass’y 5.
Disassembly and Reassembly 6. Unwrap the Themister Harness, as shown below. 7. Remove the one screws securing the Thermister and remove it, as shown below. Thermistor Harness Thermistor 5.12 Fan 1. Before you remove the Fan, you should remove: - Front Cover - Rear Cover - Side Cover(RH) - Top Cover 2. Unplug one connector from the SMPS and remove one screw as shown below. Then take out the Fan.
Disassembly and Reassembly 5.13 LSU 1. Before you remove the LSU, you should remove: - Front Cover - Rear Cover - Side Cover(RH) - Top Cover 3. Unplug the two connectors From the LSU, as shown below. Connector 2. Remove the four screws securing the LSU and remove it.
Disassembly and Reassembly 5.14 Drive Ass’y 1. Before you remove the Drive Ass’y, you should remove: - Front Cover - Rear Cover - Side Cover(LH) - Top Cover 3. Unplug one connector From the Driver Ass’y. Drive Ass’y 2. Remove six screws from the Drive Ass'y. Caution The six screws have numbers stamped into the Drive Ass’y base plate. When refitting the Drive Ass’y tighten the screws the order they are numbered.
Disassembly and Reassembly 5.15 Transfer Ass’y 1. Before you remove the Transfer Ass’y, you should remove: - Front Cover - Rear Cover - Middle Cover - Side Cover(LH, RH) - Top Cover 4. Unlatch the Transfer Roller as shown below and remove it. 2. Remove three screws and take the Transfer Earth out. Transfer Roller Transfer Earth 5. Unlatch the two transfer roller vushes and remove them as shown below. Transfer Roller Bush 3.
Disassembly and Reassembly 5.16 MP Ass’y and Feed Roller 1. Before you remove the Feed Ass’y, you should remove: - Front Cover - Rear Cover - Middle Cover - Side Cover(LH, RH) - Top Cover 4. Remove the two screws from the Guide Paper Spring. Feed Bracket 2. Disconnect the MP Solenoid and MP Sensor harness from the main PBA. Remove the four screws from the MP Ass'y Front and take it out taking care to thread the cables through the frame. 3. Remove the four screws from the MP Ass’y and take it out. 5.
Disassembly and Reassembly 7. Remove the Feed Gear1, as shown below. 8. Remove the Feed Roller and Feed Roller1, as shown below.
Disassembly and Reassembly 5.17 Pick-Up Ass’y & Solenoid 1. Before you remove the Pick-Up Ass’y & Solenoid, you should remove: - Front Cover - Rear Cover - Middle Cover - Side Cover(LH, RH) - Top Cover 2. Remove the Pick-Up Gear Ass’y as shown below. 4. Disconnect the Main Clutch and Regi Clutch harness from the main board. Remove two screws then remove the two solenoids talking care to thread the cables through the frame. Pick-Up Solenoid Pick-Up Gear Ass’y Manual Solenoid 5.
Disassembly and Reassembly 6. It is a simple matter to replace the MP Pickup Roller and the main cassette Pickup Roller without dismantling the set. In both cases first remove the main paper cassette, toner cartridge and front cover. a) In order to replace the main cassette Pickup Roller 1) Turn the set upside down 2) Release the white catch and slide the locking piece as far to the side as possible. 3) Slide the white collar as far to the side as possible.
Disassembly and Reassembly MEMO 5-20 Service Manual Samsung Electronics
Alignment & Adjustments 6 6. Alignment and Adjustments This chapter describes some of the main service procedures including: Using the DCU for diagnostics; Clearing paper jam and test patterns. Much of this chapter is also included in the user's guide. 6.1 How to use DCU 6.1.1 DCU Setup You can use the DCU test jig as an aid to the diagnosis of printer problems.
Alignment & Adjustments 6.1.2 Code The DCU can be used in 2 modes – Status Monitoring and Self Diagnostic. To use the DCU in Status monitoring mode connect the DCU and turn the printer power on. The 7 segment LED display will show various codes that show the progress of the print operation. 1) Normal Code When the printer is warming up or during a print job the display indicates the paper position.
Alignment & Adjustments 6.1.3 Self Diagnostic Mode If Error code is displayed use the Self Diagnostic Mode to assist in solving the problem. Only use the Self Diagnostic mode for fault finding as many safety features are disabled. To enter the Self Diagnostic mode connect the DCU and hold down the [Down], [Shift] and [Stop] at the same time. Whilst holding these buttons turn the printer power on. Code 78 will appear in the display.
Alignment & Adjustments Code 6-4 Description 07 Paper Empty Sensor Test : The ‘ON’ LED indicates the status of the main cassette Paper Empty sensor. 08 Feed & Exit Sensor Test The ‘OFF’ LED indicates the status of the Exit sensor The 3 rd LED indicates the status of the Feed Sensor Note the Feed sensor also detects the presence of the toner cartridge 09 Cover Open Sensor Test The ‘ON’ LED indicates the status of the Cover Open sensor.
Alignment & Adjustments No.
Alignment & Adjustments 6.2 Paper Path 5 L S U 4 Fuser Toner Cartridge CR PR EXIT Sensor 6 DR OPC 3 SR 2 FR TR MP Sensor K /R MP Sensor P IC 1 1 2 3 Cassette Manual Feeder Transfer Roller L S U Fuser Toner Cartridge 4 5 6 Fuser LSU(Laser Scan Unit) Toner Cartridge 1) After receiving the print command, the printer feeds paper from the main or optional second cassette or manual feeder as required.
Alignment & Adjustments 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.
Alignment & Adjustments 6.3.2 In the Paper Feed Area (JAM0) 1) Slide out the tray to expose the jammed paper. 2) Remove any jammed 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.
Alignment & Adjustments 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.
Alignment & Adjustments 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 the printer configuration.
Alignment & Adjustments 2) The Demo page or the configuration sheet shows the printer’s current configuration.
Alignment & Adjustments 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.
ALIGNMENT & A D J U S T M E N T S 6.5 Consumables and Replacement Parts The life cycle outlined below is a general guideline for maintenance purposes and is for reference only. Environmental conditions (temperature, humidity, dust etc.) and actual use can cause these figures to vary. COMPONENT REPLACEMENT CYCLE Transfer Roller 60,000 Pages Fuser 80,000 Pages Toner Cartridge 5,000 Pages cartridge supplied with set 5,000 Pages replacement cartridge 6.
Alignment & Adjustments 6.7 Periodic Defective Image If a mark or other printing defect occurs at regular intervals down the page it may be caused by a damaged or contaminated roller. Measure the repetition interval and refer to the table below to identify the roller concerned. 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 44.
Troubleshooting 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 developer roller, deformed Doctor-blade or cleaning-blade in the Toner cartridge. 1. Replace the toner cartridge and test again. 2.
Troubleshooting 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 on the toner cartridge high voltage terminals. 1. Clean all HV terminals on the cartridge and on the set frame. Ensure all toner or paper dust particles are removed. 2.
Troubleshooting 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. Toner Save mode enabled 1. Ensure the Toner Save mode is off. Check set and driver settings. 2. Develop roller is contaminated or the toner cartridge is almost empty. 2. Replace the toner cartridge and try to print out again. 3. Ambient temperature is below than 10°C. 3.
Troubleshooting 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 holders are damaged. 1. Replace both the left and right bush and spring assemblies. 2. The life of the Toner cartridge has expired. 2. Replace the toner cartridge and try to print out 3.
Troubleshooting 7.1.9 Ghost (1) • Description Check and Cause 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. 1. Bad contacts caused by contamination from toner particles between high voltage terminal in the main body and the electrode of the Toner cartridge. Solution 1 and 2. Clean all HV contacts, If problem persists replace the HVPS.
Troubleshooting 7.1.11 Ghost (3) • Description Check and Cause 75.5mm or 78mm Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Ghost occurs at 75.5mm or 78mm intervals. Fuser contamination or temperature control problem. Solution 1. Disassemble the fuser and remove any contamination on the rollers. Clean any contamination from between the Thermistor and the Heat roller. (Caution: Take care not to deform the rollers.) 7.1.
Troubleshooting 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 from the transfer roller. 2. Pressure roller is contaminated. Note. Replace the transfer roller if contaminated severely. 2.
Troubleshooting 7.2 Paper Feed problems - Causes and Solutions 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 • Description 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 is not ted into the printer.
Troubleshooting 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. 1. Replace the Exit-Sensor, SMPS or main PBA. 2.
Troubleshooting 7.2.5 Multi-Feeding • Description Multiple sheets of paper are fed at once. Check and Cause Solution 1. Check that the paper size guides are set correctly (cassette and MPF tray). 1. Adjust paper guides. 2. Solenoid malfunction (the solenoid does not work properly). Perform DCU diagnostic Code 06 2. Replace the solenoids or PBA as appropriate. 3. Friction Pad is contaminated. 3. Clean the friction pad rubber with a soft cloth dampened with IPA (Isopropyl Alcohol) or water. 4.
Troubleshooting 7.2.7 Paper rolled on the OPC Drum • Description Paper is rolled up in the OPC. Check and Cause Solution 1. Paper is too thin. 1. Use paper that conforms to the printer specification. 2. The face of paper is curled. 2. Ensure paper is stored properly to prevent curl. Note. To remove paper rolled in the OPC. • Remove the toner cartridge from the set, taking care not to touch the green surface. Use the gearwheel at the side to rotate the OPC drum and pull the paper from the cassette.
Troubleshooting 7.3 Printer Faults – Causes and Solutions 7.3.1 All LEDs blinking (Fuser Error) • Description 1. All the lamps on the operator panel blink. 2. The fuser drive gear breaks or melts. 3. When printing the motor skips or makes a noise due to a defective fuser drive gear Check and Cause Solution Use EDC diagnostic code 10 to test the fuser. 1. Thermostat, fuser power cable or heat lamp is open circuit. 1. Replace heat lamp or cable harness if necessary.
Troubleshooting 7.3.3 Fuser gear melts due to overheating causing Paper Jam. • Description Constant Jam where paper is entering Fuser unit. Fuser rollers do not turn Check and Cause 1. Check the Heat Lamp, thermostat and thermistor. Use the DCU Diagnostic Test 10 Error codes: ‘60’, ’62’, ‘68’. Solution 1. Replace Fuser unit 2. Replace the Main PBA as appropriate. 7.3.4 Paper Empty • Description The Paper Empty lamp is lit even when paper is loaded in the cassette. Check and Cause Solution 1.
Troubleshooting 7.3.5 Paper Empty without indication • Description The paper empty lamp does not light when the paper cassette is empty. Check and Cause Solution 1. Deformed paper sensor actuator or faulty sensor. 1. Replace the defective actuator. 2. Main PBA is defective. Use EDC diagnostic test 08. 2. Replace the MAIN PBA as appropriate 3. Faulty cables, connector or faulty Lamp 3. Check and replace cable harness or OPC as appropriate. 7.3.
Troubleshooting 7.3.7 No ERROR lamp when the cover is open • Description The ERROR lamp does not light even when the print cover is open. Check and Cause Solution Use EDC diagnostic code 09, Check for error code ‘64’. 1. The 'Hook Lever' actuator may be stuck or faulty 1. Use EDC mode to check cover switch operation. Check and replace the actuator if necessary. 2. The OPE LED may be faulty. Check the connector and cables between the main PBA and the OPE panel 2.
Troubleshooting 7.3.8 Defective motor operation • Description Main motor is faulty and paper does not feed into the printer, resulting in Jam 0' Check and Cause Solution Perform EDC diagnostic code 00 to test the main motor. 1. The main motor harness or Motor PCB may be faulty. 1. Check the motor harnesses and connectors, replace if defective.. 2. The main PBA may be faulty 2. If the problem persists check and replace the main PBA or SMPS as appropriate. . 3. SMPS may be faulty 7.3.
Troubleshooting 7.3.10 Printed Vertical Lines become curved • Description When printing, vertical lines are not straight. Check and Cause Use EDC diagnostic code 05 to test the LSU motor. 1. Check stability of 24V supply to LSU. Solution 1. 24V stable - Replace LSU. 24V unstable replace SMPS, if the problem persists replace the main PBA.
Troubleshooting 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.
Troubleshooting 7.4.4 Signs and Measures at Poor toner cartridge Fault Light image and partially blank image (Cartridge life is ended.) Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Signs • The printed image is light or dirty and untidy. • Parts of the image are not printed. • Periodically a "tick tick" noise occurs. Cause & Check 1. If the image is light or dirty and untidy - Shake the toner cartridge and then recheck. OK: Lack of toner, so the life is nearly expired.
Troubleshooting Fault White Black spot Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Signs • Light or dark black dots on the image occur periodically. • White spots occur in the image periodically. Cause & Check Solution 1. If light or dark black dots occur at regular intervals this is because the toner cartridge rollers are contaminated with foreign substance or paper particles. (1)38mm interval : Charge roller (2)95mm interval : OPC cycle 1.
Troubleshooting Fault Ghost & Image Contamination Signs Cause & Check Solution • The printed image 1. The printed image is too light is too light or dark, or dark, or partially or partially contaminated black. contaminated black. (a) Check if foreign substance or toner are stuck to the • Totally terminals (point of contact) contaminated black. of the toner cartridge or set. (Black image (b) Check if the terminal printed out) assembly is normal. 1.
Troubleshooting 7.5 Software Problems – Causes and Solutions 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. Print a Demo Page: When the Ready lamp is lit press and hold the Cancel button until the lamps flash. Release the button. 1. If the test print works that means there are no problems in the printer itself.
Troubleshooting 7.5.2 The printer is not working (2) • Description After receiving the print command there is no response at all or print speed is low due to wrong setup of the environment rather than malfunction of the printer itself. Check and Cause Solution 1. Ensure you have sufficient free hard disk space for the temporary work files created during printing. 1. Not working with the message 'insufficient printer memory' means there is a hard disk space problem rather than a printer RAM problem.
Troubleshooting 7.5.3 Abnormal Printing • Description Printing does not work – even after replacing the cable Printer does not work at all or strange fonts are printed, Check and Cause Solution 1. Set up the parallel port using CMOS SETUP. 1. Ensure that ECP (best) or SPP is selected in the CMOS (BIOS) setup. 2. Printer Driver Error. 2. Ensure that the correct driver is loaded. Use the driver supplied on the CD or downloaded from the Samsung web site.
Troubleshooting 7.5.4 SPOOL Error • Description SPOOL (simultaneous peripheral operations online) is the process Windows uses to manage print jobs. Jobs are processed and then stored on the hard disk until the printer is ready to accept them Check and Cause Solution 1. Insufficient space on the hard disk in the directory assigned for the basic spool. 1. Delete any unnecessary files to provide more space for spool storage. 2. If previous printing errors were not solved. 2.
8. Exploded Views and Parts List (Basic Model) 8-1. Main Assembly 8-2. Frame Assembly 8-3. MP Assembly 8-4. Fuser Unit Assembly 8-5. RX Driver Unit Assembly 8-6. Cassette Unit Assembly 8-7.
6-9 6-8 6-5 6 6-10 6-6 6-7 6-4 6-10 6-1 6-2 6-11 6-3 Toner Cartridge 3 7-1 7 0 SCF(Optopm Cassette Unit) 20 7-2 9 17 7-3 2-2 22 19 2-5 2-4 2-3 14-1 21 2-6 15 18 10 14-2 12 13 11 14(ML-2251N only) 16 2-1 2 8 5-2 14-3 14-6 14-4 14-1 14-2 14-5 14(ML-2252W only) 4 5 5-1 5-3 8.
46-2 46-1 47-2 50 47-1 46 47-3 26 47-4 47 53 47-5 25 29 56 55 45-1 45-2 43 57 45-3 24 45 44 32 34 27-2 27-1 59 17 39 25 41 40 27-3 42 28 30 27 59 60 33 21-1 Transfer Roller 21-3 21-2 66 37 38 49 21 20 51 23 31 36 62 5 5 22 61 7 18 5 19 19-1 72 49 19-2 15 65 63-1 63-2 65-4 65-2 14 13 63 65-1 65-3 6 11 58 61 10 35 73 16 3 8 70 9 12 73 48 4 2 8.
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Samsung Electronics SCF (Option) CARTRIDGE INFO. Solenoid PTL (Option) USB2.0 IEEE1284 Voltage Detector A3977 Motor Driver HEATER-AC F.G + Power On Reset MPF-SENSOR FLASH MEMORY ( 2MB ) SDR AM (16MB) SPGPm Controller Block - Freq . Spread MP- SENSOR MHV THV Cover- Open Switch +24V THVPWM SUPPLY BIASPWM DEV PANEL FAN LSU To Controller OPCGND MHVPWM GND +24V +5V +3.
Connection Diagram 10 10. Connection Diagram ROMDIMM 100PIN CN14 ROMDIMM CN7 60 PIN CN5 1 2 3 4 5 6 7 8 9 10 11 100PIN CN13 IEEE1284 COMPATIABLE CABLE HOST COMPUTER USB CABLE SCF (OPTION) CN15 36 PIN Main Board 4PIN CONN-EC TOR for USB2.0 CN16 8PIN J1 CARTRIDGE INFO. 4PIN 1 2 3 4 MOTOR DCU 1 2 3 4 THER1 THER2 A A/ B B/ 3.3V DCU DATA DCU CLK GND 1 2 3 4 5 1 2 3 4 5 6 POLYGON MOTOR LSU LD 1 2 3.
Connection Diagram SMPS Signal PIN Table Output Connector(to Main Board) Feed Sensor N o 1 N o 2 Paper Empty +5.0V 3 4 +5.0V +5.0V GND 5 6 +5.0V GND +24V GND 7 8 N.C +24VS GND 9 10 +24VS GND +24VS 11 12 +24VS +24V 13 14 MANUAL THV READ 15 16 LED READY THV PWM 17 18 LED ERROR BLAS PWM 19 20 THV EA LED TONER SAVE 21 22 MHV PWM FAN 23 24 KEY DEMO EXIT 25 26 FUSER ON Pin Name Panel Pin Assign Pin Name 1 25 2 26 HRW, 2.
S C H E M ATIC DIAG R A M S 11 11. Schematic Diagrams 11.1 Main Circuit Diagram (1/9) Service Manual Samsung Electronics This Document can not be used without Samsung’s authorization.
S C H E M ATIC DIAG R A M S Main Circuit Diagram (2/9) 11-2 Service Manual This Document can not be used without Samsung’s authorization.
S C H E M ATIC DIAG R A M S Main Circuit Diagram (3/9) Service Manual Samsung Electronics This Document can not be used without Samsung’s authorization.
S C H E M ATIC DIAG R A M S Main Circuit Diagram (4/9) 11-4 Service Manual This Document can not be used without Samsung’s authorization.
S C H E M ATIC DIAG R A M S Main Circuit Diagram (5/9) Service Manual Samsung Electronics This Document can not be used without Samsung’s authorization.
S C H E M ATIC DIAG R A M S Main Circuit Diagram (6/9) 11-6 Service Manual This Document can not be used without Samsung’s authorization.
S C H E M ATIC DIAG R A M S Main Circuit Diagram (7/9) Service Manual Samsung Electronics This Document can not be used without Samsung’s authorization.
S C H E M ATIC DIAG R A M S Main Circuit Diagram (8/9) 11-8 Service Manual This Document can not be used without Samsung’s authorization.
S C H E M ATIC DIAG R A M S Main Circuit Diagram (9/9) Service Manual Samsung Electronics This Document can not be used without Samsung’s authorization.
S C H E M ATIC DIAG R A M S 11.2 HVPS Circuit Diagram (1/2) 5V 24V 5V C215 104 R 209 100K T201 R202 100 TH V PW M CN2-#17 TH V 11 4 Q201 A708-Y D201 1N4148 10 R210 5.
S C H E M ATIC DIAG R A M S HVPS Circuit Diagram (2/2) 24V 5V C404 472 +5V ZD 401 2. 7V R 403 1. 5M 5V MHV 5 4 MH V-sen>> 14 6 3 + R401 47K IC 104/ C 7407 R 402 22K C401 473 >> MHV 5 6 1 7 C 409 R 411 R 414 3KV471 BLR 1/ 2W 20M F BLR 1/ 2W 15M J >>MHV -sen R405 10K C 403 331 R413 R D S1/2W 100KJ 2 C407 103 R404 10K U 94/ A 7 C 405 104 Q401 A708-Y 1 2 - D 404 R 410 4KV M GR 1/ 4W 560KJ 4 R408 470 11 M H V PW M CN 2-#22 T401 R 406 5. 6K D 401 1N4148 R415 5.
S C H E M ATIC DIAG R A M S 11.3 SMPS Circuit Diagram (1/3) C11 C12 AR1 SSG-102-A1 472MAA*2 SW1 F2 125V3A C3 TNR1 10D221 AC IN C2 D103 200V3A*2 R1 C4 474 R2 SW2 CON2-11,12,13 R8 C7 200V 330uF 1/4W330K*2 C1 474 BD1 D3SBA60 1/4W270K*2 LF1 0610V 102MAD*2 F1 125V8A SS-5GLD C11 630V 103K +24VS 2.
S C H E M ATIC DIAG R A M S SMPS Circuit Diagram (2/3) C11 C12 AR1 SSG-102-A1 472MAA*2 SW1 F1 250V5A LF1 0610V F2 250V2A BD1 D3SBA60 D103 200V3A*2 SW2 R1 C4 474 R2 C7 400V 100uF 1/4W330K*2 C2 1/4W270K*2 C3 TNR1 10D561 AC IN 102MAD*2 CON2-11,12,13 C1 474 SS-5GLD R8 C11 630V 103K +24VS 2.
S C H E M ATIC DIAG R A M S SMPS Circuit Diagram (3/3) C11 C12 AR1 SSG-102-A1 472MAA*2 SW1 F1 250V5A LF1 0610V F2 250V2A BD1 D3SBA60 D103 200V3A*2 SW2 C2 C4 474 R2 SS-5GLD R8 C7 450V 100uF 1/4W330K*2 C3 1/4W270K*2 C1 474 TNR1 10D561 AC IN 102MAD*2 CON2-11,12,13 R1 C11 630V 103K +24VS 2.
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. May. 2005 Printed in Korea. VERSION NO. : 1.
