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Samsung ML-2251N/XAA, Service Manual

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Samsung ML-2251N/XAA Service Manual Download Page 42

5-4

Disassembly and Reassembly

Samsung Electronics

Service Manual

1. Release two screws and remove the Option

Cover Ass’y.

2. Remove the Cover Face up in the direction of

arrow.

3. Release two screws, as shown below and

remove up the “Rear Cover” (release plastic
“HOOK” carefully)

Rear Cover

Rear Open

Cover Face up

Use Driver

5.4 Rear Cover

Note. To make Disassembly and Reassembly simpler.

• Disassembly - Switch in OFF Position

• Reassembly – Switch in ON position

Summary of Contents for ML-2251N/XAA

Page 1: ... PRINTER 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 Schematic Diagram Basic Model ML 2210 ML 2251N ...

Page 2: ...UTION INVISIBLE LASER RADIATION WHEN THIS COVER OPEN DO NOT OPEN THIS COVER VORSICHT UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GE FFNET NICHT DEM STRAHL AUSSETZEN ATTENTION RAYONNEMENT LASER INVISIBLE EN CAS D OUVERTURE EXPOSITION DANGEREUSE AU FAISCEAU ATTENZIONE RADIAZIONE LASER INVISIBILE IN CASO DI APERTURA EVITARE L ESPOSIZIONE AL FASCIO PRECAUCION RADIACION LASER IVISIBLE CUANDO SE ABRE EVIT...

Page 3: ...ng the power connector The power connector must be inserted com pletely otherwise a poor contact could cause overheating possibly leading to a fire When removing the power connector grip it firmly and pull 7 Take care of the power cable Do not allow it to become twisted bent sharply round corners or other wise damaged Do not place objects on top of the power cable If the power cable is damaged it ...

Page 4: ... replacing any parts 1 Check the contents of the machine memory and make a note of any user settings These will be erased if the mainboard or network card is replaced 2 Ensure that power is disconnected before servicing or replacing any electrical parts 3 Disconnect printer interface cables and power cables 4 Only use approved spare parts Ensure that part number product name any voltage current or...

Page 5: ...et harm 3 When you move the printer This printer weighs 12 7kg including toner cartridge and cassette Use safe lifting and handling techniques Use the lifting handles located on each side of the machine Back injury could be caused if you do not lift carefully 4 Ensure the printer is installed safely The printer weighs 12 7Kg ensure the printer is installed on a level surface capable of supporting ...

Page 6: ...nt electrostatic charge buildup in the vicinity of the assem bly 3 Use only a grounded tip soldering iron to solder or desolder ESDs 4 Use only an anti static solder removal device Some solder removal devices not classified as anti static can generate electrical charges sufficient to damage ESDs 5 Do not use Freon propelled chemicals When sprayed these can generate electrical charges sufficient to...

Page 7: ...y troubleshooting as described in this service manual DCU Diagnostic Control Unit Standard Test equipment to diagnose the Laser printer supplied by Samsung Electronics DVM Digital Volt Meter Standard Indicates more than 3 digits Driver Standard type type M3 long M3 short M2 long M2 short Tweezers Standard For general home use small type Cotton Swab Standard For general home use for medical service...

Page 8: ...c Random Access Memory DVM Digital Voltmeter ECP Enhanced Capability Port ECU Engine Control Unit EEPROM Electronically Erasable Programmable Read Only Memory EMI Electro Magnetic Interference EP Electro photographic EPP Enhanced Parallel Port F W Firmware FCF FCT First Cassette Feeder First Cassette Tray FISO Front In Side Out FPOT First Print out Time GDI Windows Graphic Device Interface GIF Gra...

Page 9: ...cument Format PDL Page Description Language Ping Packet internet or Inter Network Groper PPD Postscript Printer Discription PPM Page Per Minute PS Post Script PTL Pre Transfer Lamp PWM Pulse Width Moduration Q ty Quantity RAM Random Access Memory ROM Read Only Memory SCF SCT Second Cassette Feeder Second Cassette Tray SMPS Switching Mode Power Supply SPGP Samsung Printer Graphic Processor SPL Sams...

Page 10: ...oper environment A firm level surface Away from the direct airflow of air conditioners heaters or ventilators Free of extreme fluctuations of temperature sunlight or humidity Clean dry and free of dust 552 mm 21 7 in 100 mm 3 9 in 954 6 mm 37 5 in 482 6 mm 18 8 in 100 mm 3 9 in 100 mm 3 9 in 2 4 REFERENCE INFORMATION Samsung Electronics Traninung Manual ...

Page 11: ...s 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 1 A4 5 Pattern ...

Page 12: ...2 6 REFERENCE INFORMATION Samsung Electronics Traninung Manual 2 4 2 A4 2 Pattern ...

Page 13: ...2 7 Samsung Electronics REFERENCE INFORMATION Traninung Manual 2 4 3 A4 ISO 19752 Standard Pattern This test page is reproduced at 70 of the normal A4 size ...

Page 14: ...Types of desk top PC or Lap top that uses the wireless LAN About the certificated mark of Wi FiTM Wi FiTM is a registered trademark of the WECA Wireless Ethernet Compatibility Alliance Over 50 wireless LAN companies are member of this organisation Most of the main wireless networking companies are attending including such companies as Lucent Technologies Cisco Intel Symbol 3Com Enterasys Cabletron...

Page 15: ...Size Max Size Min Margin Top Bottom Left Right Up to 20ppm in A4 22ppm in Letter NO Up to 1200x1200dpi effective output 600dpi YES 128 Gray 358mmx452mmx278mm 14 1 x17 8 x10 9 10kg 22 lbs 12 7kg 28lbs Cassette Type S Path YES 50 Sheets YES Stacker NO S White W91641 Bright Gray G71335 YES Lever NO 1 Key No LED Cancel Toner Save 2 LED 1 Dual Color LED Ready Error Toner Save 42 sec 42 sec 10 sec from ...

Page 16: ... 3 Optional Second Cassette Feeder 250 sheets Cassette A4 A5 Letter Legal Executive Folio ISO B5 JIS B5 3 x5 Oficio Manual Slot No Multi Purpose Feeder A4 A5 A6 Letter Legal Folio Executive ISO B5 JIS B5 3 x5 Monarch No 10 DL C5 C6 ficio Second Cassette Feeder A4 A5 Letter Legal Executive Folio ISO B5 JIS B5 C6 Oficio 1 Cassette 16 24lb 60 to 90g 2 Multi Purpose Feeder 16 43lb 60 to 163g 3 Second ...

Page 17: ...aning Mode Service Mode SPGPm 166MHz YES ML 2250 SPL PCL6 Firmware EPSON IBM ProPrinter ML 2250 50G Domestic SPL PCL6 Firmware KS5843 KSSM KSC5895 PostScript 3 with 136 fonts YES IEEE1284 USB 2 0 Serial NO IrDA NO YES Export 16MB 144MB Domestic 32MB 160MB SDRAM YES 1EA N A Flash Memory 45 Scalable 1 Bitmap N A ML 2251N 10 100 Base TX ML 2252W 10 100 Base TX Wireless LAN YES 10 100 Base TX ML 2251N...

Page 18: ...Denmark China Taiwan Printer Driver Acrobat Reader Manual SM Electronic Registration SPL 1 Orientation Portrait Landscape Rotate 180 Degrees 2 Layout Options Type Pages per Side Page Order 3 Favorites 1 Copies 2 Paper Options Size Source Type 3 Favorites 1 Resolution 1200dpi Best 600dpi Normal 2 Toner Save Printer Setting On Off 3 Advanced Options 4 Favorites 1 Watermark 2 Overlay 3 Output Options...

Page 19: ...5 Letter Legal Executive Oficio Folio ISO B5 JIS B5 16 24lb 60 to 90g m2 YES 1EA SDRAM 16MB 32MB 64MB 128MB 70nsec YES Internal Network Adaptor ML 2251N 10 100 BaseTX Wireless LAN SPX IPX TCP IP Ethertalk SNMP HTTP 1 1 DLC LLC MS Windows 98 NT ME 2000 XP SUN Solaris HP UX SCO Novell Netware Macintosh PostScript 3 Emulation 4MB 8MB N A N A N A N A N A N A N A YES YES 3 6 Other Specifications Item M...

Page 20: ...3 6 Specifications Samsung Electronics Service Manual MEMO ...

Page 21: ...mary of Product This chapter describes the functions and operating principals of the main components 4 1 Printer Components 4 1 1 Front View Output Support Top output tray Face down Control Panel Power switch Paper level indicator Tray Multi Purpose Feeder Front Cover ...

Page 22: ...4 2 Summary of Product Samsung Electronics Service Manual 4 1 2 Rear View Rear output tray Face up Power receptacle Parallel port USB port ...

Page 23: ...ing In Manual Feed mode if there is no paper in the Manual Feeder the On Line Error LED blinks red Load paper into the Manual Feeder and the LED stops blinking If the printer is receiving data the On Line Error LED slowly blinks green If the printer is printing the received data the On Line Error LED blinks green quickly If you press the Cancel button in Ready mode this LED is on and the Toner Sav...

Page 24: ...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 Canceling print job Press this button during printing The On Line Error LED blinks while the print job is cleared from both the printer and the computer and then return to Ready mode This may take some time depending on the size of the print job In Manual Feed...

Page 25: ...Bi polar 2 phase motor It drives the OPC Paper Pick up and paper feed rollers using a gear train mechanism d Image development unit Using a Laser Scanning Unit LSU this section of the mechanism creates the image on the OPC drum part of the integrated toner cartridge e Image transfer unit The function of the this unit uses High Voltages supplied by the HVPS to move the image from the developer unit...

Page 26: ...tronics Service Manual 4 2 2 System Layout PIC K R L S U Toner Cartridge PR Fuser EXIT Sensor OPC CR DR SR TR FR 1 1 2 2 3 6 3 4 Cassette Manual Feeder Transfer Roller 5 6 5 Fuser LSU Laser Scan Unit Toner Cartridge 4 MP Sensor MP Sensor ...

Page 27: ...he amount of paper remaining 3 Pick up roller The pickup roller is used to pick up and feed paper into the printer It also is used to remove any static charge on the paper 4 MP tray The Multi purpose tray is used to hold non standard paper sizes and special media envelopes transparencies etc There is an MP paper empty sensor It uses a friction pad method to ensure paper separation and can hold a m...

Page 28: ...eres to the surface of the paper permanently 4 2 6 4 Safety features To prevent overheating 1st protection device Hardware cuts off when overheated 2nd protection device Software cuts off when overheated 3rd protection device Thermostat cuts off mains power to the lamp Safety device Fuser power is cut off when the front cover is opened LSU power is cut off when the front cover is opened The temper...

Page 29: ...eveloping Method Non magnetic 1 element contacting method Toner Non magnetic 1 element shatter type toner The life span of toner 5 000 sheets ISO19752 standard Toner remaining amount detecting sensor No OPC Cleaning Film OPC using an electro static cleaning process Management of waste toner Collected using an electro static process and retained within the toner cartridge no waste toner to dispose ...

Page 30: ... main board from the power supply PBA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 8 LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS LD1117DT U1 LOW POWER DUAL BIPOLAR COMPARATORS LM393D U2 SPREAD SPECTRUM CLOCK GENERATOR CY25811 U4 CPU X TAL 12MHz OSC1 SDRAM K4S641632H U6 U15 LOW VOLTAGE HEX INVERTER WITH 5V TOLERANT SCHMITT TRIGGER INPUTS 74LCX14 U7 MOTOR DRIVER A3977SLP U9 GRAPHIC PROCES...

Page 31: ...ller Motor Control Unit Motor Speed Lookup Table Memory 128 x 16 x 2 Pulse Width Modulation Unit 4 Channels are supported ADC Interface Unit 3 ADC Channels are available ADC Core ADC8MUX8 maximum clock frequency 3 MHz USB 2 0 Interface Package 272 pins PBGA Power 1 8V Core 3 3V IO power operation Speed 166MHz core ARM946ES operation 60MHz bus operation 4 3 2 Memory The ML2250 has Flash ROM and DRA...

Page 32: ...ec after paper is fed a paper jam0 occurs Red ERROR LED is lit 4 3 5 4 Toner Remain Sensing The ML2250 does not have a toner sensor fitted 4 3 5 5 Paper Exit Sensing This detects that paper exits cleanly from the set using an exit sensor on the engine board and actuator on the frame The CPU detects the on off time of the exit sensor and normal operation or jam status is reported If a Jam 2 error o...

Page 33: ...e while controlling the fusing process the error stated in the table occurs For the domestic model the Q PID method has been applied Error Type 4 3 5 10 LSU The LSU consists of the LD Laser Diode and the polygon motor control When the printing signal occurs the LD is turned on and the polygon motor is enabled When the light sensor detects the beam Hsync occurs When the polygon motor speed becomes ...

Page 34: ...V 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 The HVPS part uses the 24V and outputs the high voltage for THV MHV BIAS and the outputted high voltage is supplied to the toner OPC cartridge and tran...

Page 35: ... Duty cycle of the THV PWM Signal 10 Duty 650V 90 Duty 5KV 5 2 Charge Voltage MHV Input Voltage 24 V DC 15 Output Voltage 1 3KV 1 8KV DC 50V Output Voltage Rise Time 50 ms Max Output Voltage Fall Time 50 ms Max Output Loading range 30 MΩ 1000 MΩ Output Control Signal MHV PWM CPU is HV output when PWM is Low 3 Cleaning Voltage THV The Transfer Voltage is not output because the THV PWM is controlled...

Page 36: ...AC 90V 135V AC 198V 264V EXP version Rated Frequency 50 60 Hz Frequency range 47 63 Hz Input Current Under 4 0A rms 2 0A rms When the fuser lamp is off and input output voltages are in range 2 Rated Output Power 3 Consumption Power NO Item CH1 CH2 CH3 System 3 3V 5V 24V 1 Stand By 1 0A 0 07A 0 4A AVG 55 Wh 2 PRINTING 1 0A 0 14A 2 0A AVG 280 Wh NO Item CH1 CH2 CH3 Remark 1 Channel name 3 3V 5V 24 0...

Page 37: ...paper enters the set but it does not reach the feed sensor in certain time due to slip etc After the picking up cycle if the feed sensor is not on re pick up After re picking up if the feed sensor is not on after certain time it is JAM 0 Even though the paper reaches to the feed sensor the feed sensor is not ON This is an indication that the leading edge of the paper has already passes the feed se...

Page 38: ...4 18 Summary of Product Samsung Electronics Service Manual MEMO ...

Page 39: ...machine note the cable routing that will be affected Whenever servicing the machine you must perform as follows 1 Check to verify that documents are not stored in memory 2 Be sure to remove the toner cartridge before you disassemble parts 3 Unplug the power cord 4 Use a flat and clean surface 5 Replace only with authorized components 6 Do not force plastic material components 7 Make sure all compo...

Page 40: ... down and remove it from the printer 3 Release the hinges by pulling inwards as shown in A below 4 Pull the front cover away from the machine Cassette A Front Cover Latch Latch H Latch Holder Latch Holder Front Cover 5 2 Front Cover Maintaining Print Quality To prevent damage to the toner cartridge do not expose it to light for more than a few minutes ...

Page 41: ...ssembly and Reassembly Service Manual 1 Open the Tray Ass y 2 Carefully bend the clear plastic hinge supports to release them from the guide hooks Push the Front cover side outwards to release the MP Tray hinge 5 3 MP Tray Ass y 1 ...

Page 42: ... Remove the Cover Face up in the direction of arrow 3 Release two screws as shown below and remove up the Rear Cover release plastic HOOK carefully Rear Cover Rear Open Cover Face up Use Driver 5 4 Rear Cover Note To make Disassembly and Reassembly simpler Disassembly Switch in OFF Position Reassembly Switch in ON position ...

Page 43: ...al 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 5 5 Top Cover Take Care When removing or refitting the top cover take care not to damage the Exit Roller ...

Page 44: ... Middle Cover 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 3 Remove the two screws and release the latches from the Frame Ass y in the direction of the arrow then remove the side cover LH Side Cover RH Top Latch Bottom Latch...

Page 45: ...bly and Reassembly Service Manual 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 Exit Gear Bearing ...

Page 46: ...r Side Cover LH RH Top Cover 2 Release 1 screw and remove the SMPS shield Engine Shield Ass y 3 Remove the twelve screws securing from the Engine Shield Ass y and unplug the all connectors Then take the Engine Shield Ass y 4 Remove the two screws and remove the Exit Board Engine Shield Ass y Exit Board 5 9 Engine Shield Ass y Exit Board SMPS Shield ...

Page 47: ...ove Front Cover Rear Cover Side Cover LH RH Top Cover 2 Unplug one connector and remove three screws then take the Inlet Bracket out 3 Remove the two screws and remove the Network Board 4 Unplug one connector from the Main PBA 5 Remove the six screws and take the Main Board Inlet Bracket Memory Board Connector Main PBA ...

Page 48: ...ng Electronics Service Manual 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 Coin Screws Memory Board SMPS ...

Page 49: ... screws securing the Fuser Ass y and remove it 3 Remove the two screws securing the Thermostat Then lift the Thermostat out 4 Remove the two screws securing the Halogen Lamp Then take out the Halogen Lamp from the Heat Roller as shown below 5 Remove four screws securing the Fuser Cover and two screws securing the Guide Input to dismantle the fuser unit Thermostat Halogen Lamp 5 11 Fuser Ass y Fuse...

Page 50: ...low 7 Remove the one screws securing the Thermister and remove it as shown below Thermistor Thermistor Harness 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 5 12 Fan Fan ...

Page 51: ...embly Service Manual 1 Before you remove the LSU you should remove Front Cover Rear Cover Side Cover RH Top Cover 2 Remove the four screws securing the LSU and remove it 3 Unplug the two connectors From the LSU as shown below Connector 5 13 LSU LSU ...

Page 52: ...ont Cover Rear Cover Side Cover LH Top Cover 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 3 Unplug one connector From the Driver Ass y Drive Ass y 5 14 Drive Ass y Drive Ass y ...

Page 53: ...r 2 Remove three screws and take the Transfer Earth out 3 Unplug the PTL Holder connector then remove the PTL Holder and PTL Lens as shown below 4 Unlatch the Transfer Roller as shown below and remove it 5 Unlatch the two transfer roller vushes and remove them as shown below Transfer Roller Transfer Roller Bush Bush Spring Spring 5 15 Transfer Ass y Transfer Earth PTL Holder PTL Lens ...

Page 54: ... 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 4 Remove the two screws from the Guide Paper Spring 5 Remove the three screw from the Feed Bracket and take it out 6 Remove the Feed Gear2 as shown below Feed Gear2 Feed Gear2 5 16 MP Ass y and Feed R...

Page 55: ...5 17 Samsung Electronics Disassembly and Reassembly Service Manual 7 Remove the Feed Gear1 as shown below 8 Remove the Feed Roller and Feed Roller1 as shown below Feed Gear1 Feed Roller1 Feed Roller ...

Page 56: ...Gear Ass y as shown below 3 Remove the Pick Up 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 5 Remove the rubber pickup from the Pink Up Roller as shown below Pick Up Solenoid Manual Solenoid 5 17 Pick Up Ass y Solenoid Pick Up Gear Ass y 1 2 Pick Up A...

Page 57: ...as possible 3 Slide the white collar as far to the side as possible 4 Slide the Pickup Roller as far as possible to the side until it is free from the white collar on the other end 5 Rotate the Pickup Roller around the drive shaft until it can be removed b In order to replace the MP Pickup Roller 1 Release the white catch and slide the locking piece as far to the side as possible 2 Slide the white...

Page 58: ...5 20 Disassembly and Reassembly Samsung Electronics Service Manual MEMO ...

Page 59: ...U FEED SENSOR READY HEAT ON OFF STATUS SELF TEST DIAGNOSTIC DIAGNOSTIC CODE 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 61 00 01 02 03 04 20 30 40 50 69 60 62 68 64 70 71 72 73 95 MAIN MOTOR OPERATING SYSTEM MAIN HIGH VOLTAGE ON TRNSFER HIGH VOLTAGE ON THV REFERANCE VOLTAGE DEV SUPPLY HIGH VOLTAGE ON PTL ON LSU OPERATING SYSTEM PICKUP CLUTCH ON PEEMPTY PWITH NEW CRU TEST FEED EXIT SENSOR TEST COV...

Page 60: ... Letter 02 A4 03 EXEC 04 B5 20 Print Start The engine controller received the print order from the video controller 20 1st 21 MP 22 SCF 30 Feed Sensor On The paper is passing out of the Feed Sensor 40 Feed Sensor off The paper has passed out of the Feed Sensor 50 Paper Out The paper has passed out of Exit Sensor 69 Sleep Mode The fuser power is turned off to minimize the power consumption Code Sta...

Page 61: ...est To start the test press the Enter button To stop the test press the Shift and Enter buttons together Code Description 00 Main Motor Operating System The main motor is tested 01 Main High Voltage On MHV 1550 voltage output to MHV terminal Caution High voltage probe should be used 02 Transfer High Voltage On THV 1200 voltage output by THV terminal Caution High voltage probe should be used 03 Tra...

Page 62: ...tion Turn the power off to stop this test 12 Cleaning Mode Print Mode Causes the Cleaning cycle to be repeated continuously Turn the power off to stop this test 13 THV TRIGGER ALL HV All high voltage are output to each HV terminal TheLSU and the fan are started In this Mode the electronic resistance of the transfer roller is detected and the THV is checked 14 PTL Test Tests the PTL lamp The ON and...

Page 63: ...0V 160ßC ev Off 05 LSU LSU Run On Off Ready LSU Stop 06 PickUp Pickup On Pickup Off 07 PEmpty Paper Empty 08 Sensor Exit Feed 09 Cover Cover Open 10 Fuser Fuser On Fuser Off 11 HotBur n HotBurn On 12 Clean Print Clean Printing 13 Thv Refer ence low adequate high 14 PTL PTL On PTL Off 15 FAN Fan On Fan Off 16 Regi Clutch Regi Sensor MP Pickup MP Pickup On MP Pickup Off Regi Clutch Regi Clutch Off 1...

Page 64: ...sor OPC CR DR SR TR FR 1 After receiving the print command the printer feeds paper from the main or optional second cassette or man ual feeder as required 2 The paper being fed passes the paper feed sensor Jam 0 occurs if the sensor is not operated within a certain time 3 Having passed the paper feed sensor the paper moves to the paper exit sensor via printing process Jam 1 occurs if the sensor is...

Page 65: ...r potentially damage wiring insulation leading to an electric shock Note If when removing jammed paper the paper tears ensure that ALL fragments of paper are removed from the printer otherwise a jam will re occur 6 3 1 In the Paper Exit Area JAM2 1 If the paper jams as it exits to the output tray and a long portion of the paper is visible pull the paper straight out When you pull the jammed paper ...

Page 66: ...Reinstall the toner cartridge and then close the cover Printing can be resumed 1 Slide out the tray to expose the jammed paper 2 Remove any jammed paper by pulling it out by the visi ble 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 2 In the Paper Feed Area JAM0 6 ...

Page 67: ...re 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 Do not use creased damp or highly curled paper Do not mix paper types in the input tray Use only recommended print media Ensure that the recommended print side is...

Page 68: ...oduct 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 For ML2250 only the et configuration is printed 1 page For ML2251N and ML2252W both the set and network configuration...

Page 69: ...e toner cartridge by 40 One touch Cancel Button 250 sheet paper cassette tray Windows 95 98 Me NT 4 0 2000 XP DigitAIIcompatibility Various Linux OS including Red Hat Caldera Debian Mandrake Slackware SuSE and Turbo Linux USB 2 0 Compatible with USB 1 1 IEEE1284 parallel interface PCL6 IBM ProPrinter and EPSON emulations Optional PostScript3 emulation ML 2250 2251N 2252W Built in 10 100 Base TX ne...

Page 70: ... 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 3 Your printer automatically picks up a sheet of paper from the tray and prints out a cleaning sheet with dust or toner particles on it Note The cartridge cleaning process tak...

Page 71: ...LED Status Display by Each Error ERROR LED Status DCU CODE Open Fuser Error The Error LED red and the Toner Save LED are simultaneously 60 flashing at 1 second intervals Over Heat Error The Error LED orange and the Toner Save LED are 68 simultaneously flashing at 1 second intervals Low Heat Error The Error LED red and the Toner Save LED are simultaneously 62 flashing at 4 second intervals LSU not ...

Page 72: ...white spot on black image or black spot 2 Charge Roller 37 7mm black spot 3 Supply Roller 44 9mm light or dark horizontal image band 4 Developing Roller 35 3mm horizontal image band 5 Transfer Roller 47 1mm image ghost 6 Heat Roller 78mm Black spot and image ghost 7 Pressure Roller 75 5mm black spot on the backside PTL L S U Fuser Toner Cartridge 1 2 3 7 6 5 4 MP Sensor 1 2 3 4 OPC Drum Charge Rol...

Page 73: ...hite Line Description White vertical voids in the image Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Check and Cause Solution 1 1 Contamination of the window or internal lenses of LSU mirror 2 Foreign object inside the toner cartridge or low toner 3 Foreign object contamination or burr on the edge of the toner cartridge window 4 If the fuser is defective voids oc...

Page 74: ...odically in the printing Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Check and Cause Solution 1 If dark or blurry black spots occur periodi cally the rollers in the Developer may be contaminated with foreign matter or paper particles Charge roller 37 7 mm interval OPC drum 75 5 mm interval 2 If faded areas or voids occur in a black image at intervals of 75 5 mm ...

Page 75: ...t 30 minutes after printer is powered on before you start printing 4 Clean the cartridge and set contacts Generally clean dirt from inside the set 5 Replace the HVPS if the problems are not solved by the above four instructions 7 1 6 Dark Image or a Black Description The printed image is dark Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Check and Cause Solution 1...

Page 76: ...ound Description Light dark background appears in whole area of the printing Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Check and Cause Solution 1 Printing large quantities of low coverage 2 pages or the printer has not been used for a long time 2 Is recycled paper being used 3 Has the life span of the toner cartridge ended 4 Is the movement Up and Down of the ...

Page 77: ...lade in the toner cartridge 1 and 2 Clean all HV contacts If problem persists replace the HVPS If problem still persists replace the Main PBA 3 Replace the toner cartridge and try to print out 4 Check the transfer roller lifetime and replace it 5 Wait about 30 minutes after power on before using printer 6 Replace the toner cartridge and try to print out again 7 1 10 Ghost 2 Description Ghost occur...

Page 78: ...rinter DigitalPrinter 32mm Check and Cause Solution 1 The life of the developer may be expired 2 Abnormal output from the HVPS 1 Problem in the toner cartridge replace the toner cartridge and try to print out again 2 Check the HVPS supply voltage Clean all HV terminals on the cartridge and on the set Replace the HVPS if the problem persists 7 1 13 Stains on the Face of Page Description The backgro...

Page 79: ...out 1 Description Blank page is printed Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Check and Cause Solution Bad ground contacts in OPC and or toner cartridge 1 Check if the Ground OPC or the OPC Ground Zener diode are defective or open circuit set inside left side 2 Remove contamination of the terminals on the toner cartridge and the unit 7 1 16 Blank Page Prin...

Page 80: ...istration sensor 6 If the paper feeds into the printer and Jam 0 occurs use DCU to check feed sensor 1 Replace the solenoid 2 Repair replace as required 3 Clean with soft cloth dampened with IPA Isopropyl Alcohol or water Replace if required 4 Clean with soft cloth dampened with IPA Isopropyl Alcohol or water Replace if required 5 Ensure all rollers are clean and free to operate correctly 6 Check ...

Page 81: ...nsor It may stick open or return only slowly due to contamination be paper debris or foreign objects 2 If the paper is rolled in the Fuser Roller accordion Jam This occurs when a Guide claw is broken away damaged or deformed It occurs when the Spring of a Guide claw is broken or damaged It occurs when the Heat Roller or Pressure Roller is seriously contaminated with toner 1 Check if the exit senso...

Page 82: ...e friction pad rubber with a soft cloth dampened with IPA Isopropyl Alcohol or water 4 Use paper with a smother surface finish 7 2 6 Paper rolled in the Fuser Description Paper rolled around fuser rollers or Accordion jam Check and Cause Solution 1 Contamination of the pressure roller or heat roller 2 Damaged or deformed ribs claws or springs 1 After disassembling the fuser clean contamination fro...

Page 83: ...1 Use paper that conforms to the printer specification 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 Clean fingerprints on the OPC gently with soft tissue taking care not to scratch th...

Page 84: ... heat lamp or cable harness if necessary Replace the whole fuser assembly if the thermostat is open circuit 2 Carefully inspect the thermistor mounting If the mounting or the roller in this area is melted replace the whole fuser assembly If the thermistor is faulty but there is no sign of heat damage replace the thermistor sensor 3 Replace the fuser 7 3 2 All LEDs blinking Scan Error Description A...

Page 85: ...and thermistor Use the DCU Diagnostic Test 10 Error codes 60 62 68 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 Deformed paper sensor actuator or faulty sensor 2 Main PBA is defective Use DCU Diagnostic Test 08 3 Faulty cables or connectors 1 Replace the defe...

Page 86: ...e the defective actuator 2 Replace the MAIN PBA as appropriate 3 Check and replace cable harness or OPC as appropriate 7 3 6 Cover Open Description The ERROR lamp is lit even when the print cover is closed Check and Cause Solution 1 The Hook Lever actuator may be stuck or faulty 2 The hook Lever tab on the front cover may be damaged or broken 3 The sensor Switch on the main PBA may be defective 1 ...

Page 87: ...iagnostic code 09 Check for error code 64 1 The Hook Lever actuator may be stuck or faulty 2 The OPE LED may be faulty Check the connector and cables between the main PBA and the OPE panel 3 The sensor switch on the main PBA may be faulty 1 Use EDC mode to check cover switch operation Check and replace the actuator if necessary 2 Replace the cable or OPE Panel as necessary 3 Replace the main PBA i...

Page 88: ...rs replace if defective 2 If the problem persists check and replace the main PBA or SMPS as appropriate 7 3 9 No Power Description When system power is turned the lamps on the OPE panel do not come on Check and Cause Solution 1 Check if the power input and SMPS output are normal 2 Lamps do not come on but normal start up sounds are heard 3 After replacing SMPS lamps do not come on and no start up ...

Page 89: ...nes become curved Description When printing vertical lines are not straight Check and Cause Solution Use EDC diagnostic code 05 to test the LSU motor 1 Check stability of 24V supply to LSU 1 24V stable Replace LSU 24V unstable replace SMPS if the problem persists replace the main PBA ...

Page 90: ...hen toner is low faded or light areas may appear on a printed page You may be able to temporarily improve the print quality by redistributing the toner The following procedures may allow you to finish the current print job before replacing the toner cartridge 1 Grasp the front cover and pull it toward you to open 2 Remove the toner cartridge from the printer 3 Gently shake the toner cartridge from...

Page 91: ... intervals a Check the distance between contamination marks b Check the appearance of both ends of the toner cartridge OPC drum 2 Random page contamination a Check that the terminals contact points of the toner cartridge and the set are clean b Check that the terminals contact points of the toner cartridge and the set are not damaged 1 All of 1 2 3 If image quality improves by shaking replace with...

Page 92: ...oner cartridge and the set are clean b Check that the terminals contact point of the toner cartridge and the set are not damaged 1 For item 1 Run OPC Cleaning Mode Print 4 5 times repeatedly to remove excess toner Especially check for foreign substances on the OPC surface Clean with a clean gauze moistened with IPA Isopropyl Alcohol take care not to damage the OPC surface Never use other forms of ...

Page 93: ...ct of the toner cartridge or set b Check if the terminal assembly is normal Especially check the charge roller terminal 3 The printed image is dark and ghost occurs a Check if foreign substances are stuck to the terminal point of contact of the toner cartridge or set b Check if the terminal assembly is normal Especially check the developer roller terminal 1 All of Items 1 2 3 a Clean the contacts ...

Page 94: ...tween PC and printer port are correcct If you use windows check that the printer driver in the controller is set up correctly set up the correct port is selected and Use On line is selected in the driver If the printer driver is properly set up try printing a test page from the driver proper ties Check in which program printing is not working Try opening Memo Pad and printing If the printer is not...

Page 95: ...ns there is a hard disk space problem rather than a printer RAM problem In this case pro vide more space on the hard disk Secure more space using the disk utilities program 2 The connection of the cable and printer port is not correct Check that the cable is properly connected and if you are using the parallel port check that the port settings in CMOS is correct 3 For the printer port Select ECP S...

Page 96: ...irtual memory this is caused by insufficient space on the hard disk 1 Ensure that ECP best or SPP is selected in the CMOS BIOS setup 2 Ensure that the correct driver is loaded Use the driver supplied on the CD or downloaded from the Samsung web site DO NOT use the Microsoft driver supplied with the Windows operating system If the printer is a GDI or SPL type printer ensure that ALL OTHER GDI or SP...

Page 97: ... previous failed print jobs on the hard disk with the name in the form jnl Delete these files and Reboot Windows to restart the printer 3 Shut down all other programs except the current one if possible 4 Delete the printer driver completely and reinstall it 5 After rebooting the computer check for viruses restore the damaged files and reinstall the application program which is not working properly...

Page 98: ...oded 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 SCF Option Cassette Unit Assembly ...

Page 99: ...4 6 7 6 8 6 9 6 10 6 5 2 SCF Optopm Cassette Unit 7 17 22 16 9 20 14 ML 2251N only 15 11 10 8 5 18 19 6 10 6 6 6 1 6 2 6 11 6 3 7 3 5 1 5 2 5 3 7 2 7 1 4 13 12 2 1 2 2 2 6 2 3 2 4 2 5 14 ML 2252W only 14 4 14 3 14 5 14 6 14 1 14 2 14 1 14 2 21 ...

Page 100: ...47 39 46 17 26 42 47 1 46 1 46 2 47 2 47 3 47 4 47 5 45 1 45 2 45 3 40 41 51 5 62 5 5 2 48 4 3 65 25 33 19 1 19 2 50 7 6 37 36 38 49 49 28 29 30 34 31 32 Transfer Roller 56 23 61 63 73 61 65 1 65 4 65 2 65 3 63 2 63 1 20 66 22 19 21 21 2 21 1 21 3 27 1 27 2 27 3 59 27 60 53 55 57 59 ...

Page 101: ...8 3 MP Assembly 0 11 18 24 31 10 2 12 15 29 16 17 13 19 27 19 5 2 4 5 5 1 5 3 6 7 14 26 14 23 28 23 1 30 20 9 3 21 25 25 ...

Page 102: ...8 4 Fuser Unit Assembly 0 1 31 3 2 4 5 29 29 37 35 6 17 36 12 14 34 38 37 13 15 32 30 11 16 33 19 18 23 24 25 28 26 27 20 21 36 38 10 7 22 8 9 ...

Page 103: ...8 5 RX Driver Unit Assembly 0 1 2 3 4 4 5 6 8 7 9 5 ...

Page 104: ...8 6 Cassette Unit Assembly 0 1 2 3 4 6 7 6 4 6 3 6 2 6 1 5 5 10 11 9 15 12 13 14 8 16 ...

Page 105: ...r On Reset F G LSU SPGPm PANEL Solenoid PTL MAI N MOTOR THERMSTOR HEATER AC MHV OPCGND SUPPLY DEV THV SMPS Block FUSER ASSY EXIT SENSOR FEED SENSOR P EMPTY SENSOR SENSOR MP MPF SENSOR FAN IN LET GND 24V 5V Freq Spread Cover Open Switch HVPS Block Controller Block To Controller USB2 0 3 3V IEEE1284 EEPROM Voltage Detector A3977 Motor Driver CARTRIDGE INFO SCF Option Option ...

Page 106: ...CARTRIDGE CARTRIDGE INFO INFO THERMISTOR THERMISTOR MOTOR MOTOR DCU DCU 8PIN 3 3V 1 2 3 4 1 2 3 4 GND GND 4PIN 60 PI N NETWORK OPTION 10 CN14 CN13 CN15 CN16 J1 CN18 CN4 CN6 CN2 CN7 CN5 CN11 CN10 CN8 REGI CLUTH 1 2 24 VS REGI_Clutch 1 2 3 CN9 MPF SENSOR 1 2 MP_SENSOR GND VCC 1 2 3 3 CN17 CN1 0PIN 10 0PIN ROMDIMM ROMDIMM IEEE1284 COMPATIABLE CABLE SMPS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19...

Page 107: ... DEMO FUSER ON Panel Pin Assign No 1 2 3 4 5 10 2 Connection Diagram Samsung Electronics Service Manual Pin Name 5 0V GND LED READY LED ERROR LED TONER SAVE KEY DEMO MP_CONNECTOR PIN No 1 2 3 Pin Name Signal P_REGI GND VCC FAN_CONNECTOR PIN No 1 2 3 Pin Name Signal FAN NC GND MP_CONNECTOR PIN No 1 2 3 Pin Name Signal P_REGI GND VCC EXIT_CONNECTOR PIN No 1 2 3 Pin Name Signal Exit GND VCC EXIT_CONN...

Page 108: ...11 1 Samsung Electronics S C H E M ATIC DIAG R A M S Service Manual This Document can not be used without Samsung s authorization 11 11 Schematic Diagrams 11 1 Main Circuit Diagram 1 9 ...

Page 109: ...11 2 S C H E M ATIC DIAG R A M S Samsung Electronics Service Manual This Document can not be used without Samsung s authorization Main Circuit Diagram 2 9 ...

Page 110: ...11 3 Samsung Electronics S C H E M ATIC DIAG R A M S Service Manual This Document can not be used without Samsung s authorization Main Circuit Diagram 3 9 ...

Page 111: ...11 4 S C H E M ATIC DIAG R A M S Samsung Electronics Service Manual This Document can not be used without Samsung s authorization Main Circuit Diagram 4 9 ...

Page 112: ...11 5 Samsung Electronics S C H E M ATIC DIAG R A M S Service Manual This Document can not be used without Samsung s authorization Main Circuit Diagram 5 9 ...

Page 113: ...11 6 S C H E M ATIC DIAG R A M S Samsung Electronics Service Manual This Document can not be used without Samsung s authorization Main Circuit Diagram 6 9 ...

Page 114: ...11 7 Samsung Electronics S C H E M ATIC DIAG R A M S Service Manual This Document can not be used without Samsung s authorization Main Circuit Diagram 7 9 ...

Page 115: ...11 8 S C H E M ATIC DIAG R A M S Samsung Electronics Service Manual This Document can not be used without Samsung s authorization Main Circuit Diagram 8 9 ...

Page 116: ...11 9 Samsung Electronics S C H E M ATIC DIAG R A M S Service Manual This Document can not be used without Samsung s authorization Main Circuit Diagram 9 9 ...

Page 117: ...V221 C210 6KV221 D205 6KV D206 6KV ZD201 2 7VB R209 100K R208 10K C205 MY 2A471 R207 330KJ 5V D201 1N4148 C203 681 R205 22K R204 47K C201 M Y2A473 5V R202 100 R201 430 11 10 Q201 A708 Y R206 130KF R203 2KJ C215 104 Q202 945C Y C208 MY 2A681 24V C206 MY 2A104 D202 D1NL20U D203 D1NL20U R211 1 4W 4 7J Q203 C2383 C202 102 R306 100KF 5V 9 8 R301 5 6K R308 1KF INDEX 50K C306 M Y2A473J 10 9 8 U94 C C307 ...

Page 118: ...45C Y ZD502 2 7VB R508 470 ZD501 2 7V R505 10K R504 10K R503 330KJ C504 472 Q501 A708 Y D503 D1NL20U C507 MY 2A103 C505 104 R513 RDS1 2W 51KJ R514 RDS1 2W 51KJ ZD503 200V I T501 R509 1 4W 10 D501 1N4148 R501 47K R502 22K 5V 24V 3 4 R516 5 6K 5V C503 681 C501 473 D502 1N4148 C502 102 Q205 B1151 Y R224 100J R222 3 9KJ R221 1KJ Q204 C1008 R223 1W 1KJ IN OUT GN D U103 KA7805 C213 25V47uF C510 3KV101 R...

Page 119: ...114 1 4W150 R112 1 4W150 R106 1 4W150 R116 1 4W150 R111 NU B101 R102 NU C105 RG10V470uF GND A R11 6 8 D103 D104 200V3A 2 D101 40V3AX2 D102 C11 630V R13 1W100K C10 SG16V47uF GND A C7 200V C1 474 LF1 0610V AR1 SSG 102 A1 F2 125V3A L1 100uH C2 BD1 D3SBA60 R2 R1 1 4W270K 2 C4 474 C3 102MAD 2 D5 UF4007 AR2 SSG 102 A1 TNR1 10D221 TH1 5D 15 CON2 5 6 CON2 3 4 CON1 CON2 26 CON2 11 12 13 CON2 26 CON2 25 CON...

Page 120: ... IC TOP246Y C102 RG35V R114 1 4W150 R112 1 4W150 R106 1 4W150 R116 1 4W150 R111 NU B101 R102 NU C105 RG10V470uF GND A GND A R11 6 8 D103 D104 200V3A 2 D101 40V3AX2 D102 C11 630V R13 1W100K C10 SG16V47uF C1 474 LF1 0610V F2 250V2A C2 C3 102MAD 2 AR1 SSG 102 A1 AR1 SSG 102 A1 C4 474 R2 R1 1 4W270K 2 D5 UF4007 R8 1 4W330K 2 R9 TH1 10D 13 CON2 5 6 CON2 3 4 CON1 CON2 26 CON2 11 12 13 CON2 26 CON2 25 CO...

Page 121: ... IC TOP246Y C102 RG35V R114 1 4W150 R112 1 4W150 R106 1 4W150 R116 1 4W150 R111 NU B101 R102 NU C105 RG10V470uF GND A GND A R11 6 8 D103 D104 200V3A 2 D101 40V3AX2 D102 C11 630V R13 1W100K C10 SG16V47uF C1 474 LF1 0610V F2 250V2A C2 C3 102MAD 2 AR1 SSG 102 A1 AR1 SSG 102 A1 C4 474 R2 R1 1 4W270K 2 D5 UF4007 R8 1 4W330K 2 R9 TH1 10D 13 CON2 5 6 CON2 3 4 CON1 CON2 26 CON2 11 12 13 CON2 26 CON2 25 CO...

Page 122: ...Electronics Co Ltd May 2005 Printed in Korea VERSION NO 1 01 CODE JC 0123D This service manual is also provided on the web the ITSELF system f Samsung Electronics Co Ltd http itself sec samsung co kr ELECTRONICS ...

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