Samsung ML-1755 Service Manual Download Page 36

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5-5

Samsung Electronics

Disassembly and Reassembly

Training Manual

6. Separate Heat Roller Ass'y after remove six

screws and
After removing 6 screws as shown in below,

take out the heat roller assembly in direction of
the arrow while pulling the both side of the unit-
brush

Caution: Be careful not to damage or contaminate the surface
of the roller when assembling/disassembling the heat roller.

7. Unplug Thermister Harness from the Fuser

cover.

8. Remove one screw and separate Thermister

from the inter connector Fuser Cover.

Thermister Harness

Thermister

Fuser Cover

Unit-Brush

Heat Roller

Summary of Contents for ML-1755

Page 1: ...al LASER 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 ...

Page 2: ...here is never any human access to laser radiation above a Class I level during normal operation user maintenance or prescribed service condition Warning Never operate or service the printer with the protective cover removed from Laser Scanner assembly The reflected beam although invisible can damage your eyes When using this product these basic safety precautions should always be followed to reduc...

Page 3: ...nd it and place other materials on it Also do not fix it with staples If the power code gets damage a fire or electric shock can be caused A damaged power code must be replaced immediately Do not repair the damaged part and reuse it A repaired part with plastic tape can be occurred a fire or electric shock Do not spread chemicals on the power code Do not spread insecticide on the power code A fire...

Page 4: ...near to heater A fire can be occurred 1 2 4 Precaution when assembly disassembly When replace parts do it very carefully Do memorize the location of each cable before replace parts for reconnecting it afterwards Do memorize Please perform the below before replace or disassembly the parts 1 Check the contents stored in the memory All the information will be erased after replace main board The infor...

Page 5: ...oam to prevent electrostatic charge buildup in the vicini ty of the assembly 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 stat ic can generate electrical charges sufficient to damage ESDs 5 Do not use Freon propelled chemicals When sprayed these can generate electrical charges ...

Page 6: ...printer supplied by Samsung Electronics 1 Driver Standard type type M3 long M3 short M2 long M2 short 4 Cotton Swab Standard For general home use for medical ser vice 6 Software Driver installation CD ROM 8 Cleaning Equipments a IPA Isopropyl Alcohol dry cloth or a soft stuff neutral detergent 7 Pinset Standard For general home use small type 5 DVM Digital Volt Meter Standard Indicates more than 3...

Page 7: ...re GDI graphics device interface GND ground HBP Host Based Printing HDD Hard Disk Drive HV high voltage HVPS High Voltage Power Supply I F interface I O Input and Output IC integrated circuit IDE Intelligent Drive electronics or Imbedded Drive Electronics IEEE institute of Electrical and Electronics Engineers Inc IPA Isopropy Alcohol IPM Images Per Minute LAN local area network lb pound s LBP Lase...

Page 8: ...out Media Size 75 X 125 3 X 5 mm to 216 X 356 8 5 X 14 mm Media Thickness 16 24 lb Dimension W X D X H 348 X 355 X 193mm 13 7 X 14 X 7 6 inch Weight Net 7 Kg 15 4 lb Gross 9 5 Kg Max Acoustic Noise 1 Stand by Less than 35 dB Printing Less than 50 dB Power save mode Available Toner save mode Available Machine Life 120 000 Sheets Periodic Replacing Parts 2 Pick Up Roller 60 000 Sheets Feed Roller 60...

Page 9: ...USB 2 0 12 Mbps 1 port Parallel IEEE 1284 Modes supported Compatible Nibble Byte ECP External Network Adaptor Optional Interface switching Automatic Interface time out 5min Max Font Windows Font 45 Scalable 1 Bitmap ITEM DESCRIPTION Input Voltage Nominal input voltage 200 240 VAC 100 127VAC Input voltage range 189 264 VAC 90 132VAC Nominal frequency 50 60 Hz Frequency tolerance 3Hz Power Consumpti...

Page 10: ...veloping Non magnetic Mono Conponent Contact Developing Charging Conductive Roller Charging Toner checking sensor Not Available Ozone 0 1PPM or less 8 hours Style Single cartridge PAPER DIMENSIONS WEIGHT A4 210 X 297 mm 60 to 90 g m2 bond 16 to 24 lb Letter 216 X 279 8 5 X 11 Legal Legal14 216 X 356 8 5 X14 JIS B5 182 X257mm 7 2 X 10 Folio Legal13 216 X 330mm 8 5 X 13 Minimum size Custom 76 X 127m...

Page 11: ...3 4 Specifications Samsung Electronics Training Manual ...

Page 12: ...mary of Product This chapter describes the functions and operating principal of the main component 4 1 Printer Components 4 1 1 Front View Output Support Top output tray Face down Control Panel Power switch Paper level indicator Tray Manual Feeder Manual Feeder guide Front Cover ...

Page 13: ...4 2 S U M M A RY OF PRO D U C T Samsung Electronics Training Manual 4 1 2 Rear View Rear output tray Face up Power receptacle Parallel port USB port 4 1 3 Inside View Toner cartridge Front Cover ...

Page 14: ... 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 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 fast If you press the Cancel button in Ready mode this LED...

Page 15: ...anual Feed for Source from your software application 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 prints 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 R...

Page 16: ... D U C T Training Manual 4 2 System Layout PTL PIC K R PR CR DR SR TR FR OPC L S U Fuser Toner Cartridge 1 1 2 2 3 6 3 4 Cassette Manual Feeder Transfer Roller PTL Per Tramsfer Lamp 5 7 6 7 5 Fuser LSU Laser Scan Unit Toner Cartridge 4 MP Sensor ...

Page 17: ...ssure Roller Thermistor and Thermostat It adheres the toner to the paper with a pressure and a heat to complete the printing job There are two methods the existing method which use the Heat Lamp and the Q PID which is developed by Samsung 110V Heat Lamp type Fuser 120V Q PID type Fuser 4 2 4 1 Temperature Intercepting Device Thermostat The thermostat is the temperature intercepting device which cu...

Page 18: ... customer can find easily 4 2 5 LSU Laser Scanner Unit The LSU unit is controlled by the video controller It scans the video data received from video controller with laser beam by using the rotation principal of the polygon mirror to create the latent image on the OPC drum It is the core part of LBP The OPC drum rotates as the same speed as the paper feeding speed It creates the HS YNC signal and ...

Page 19: ...ing roller and blade Doctor blade Developing Method Non magnetic 1 element contacting method Toner Non magnetic 1 element shatter type toner The life span of toner 3 000 sheets IDC Pattern A4 standard Toner remaining amount detecting sensor None OPC Cleaning Collect the toner by using electric static FILM OPC Management of disusable toner Collect the toner by using electric static Clenerless Type ...

Page 20: ...nctioned as the bus control I O handling drivers and PC inter face The main board sends the Current Image dlml Video data to the LSU and manages the conduct of Electrophotography for printing It is consisted of the circuits of the motor paper feed pass driving clutch driving pre transfer lamp driving current driving and fan driving The signals from the paper feed jam sensor and paper empty sensor ...

Page 21: ...am and downloads the system program through the PC interface Capacity 0 5M Byte Access Time 70 nsec 4 3 3 SDRAM It is used as a swath buffer system working memory area etc while printing Capacity The 2M byte is for the ML 1710 2M Printing system working memory area The 16Mbyte is for the ML 1750 8M ML 1750G 1760G Access Time 60 nsec 4 3 4 Sensor input circuit 1 Paper Empty Sensing The Paper empty ...

Page 22: ...ed Yellow LED will be turned on among the OP panel LEDs 5 Cover Open Sensing The Cover open sensor is located on the front cover After the front cover is opened 24V DC fan sole noid main motor polygon motor part of LSU HVPS which is supplied to the each unit is cut off The cover open sensing is operated by the D0 bit of CPU and the developer ID sensing is operated by D7 bit of CPU In this case the...

Page 23: ...4 12 S U M M A RY OF PRO D U C T Samsung Electronics Training Manual 4 4 Main PBA PCL Model ...

Page 24: ...6 7 Engine Controller 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 8 USB 2 0 Interface 9 Package 272 pins PBGA 10 Power 1 8V Core 3 3V IO power operation 11 Speed 166MHz core ARM946ES operation 60MHz bus operation 4 4 2 Memory 1 Fla...

Page 25: ... 256x8x 4 gCODEC GRAPHIC EXECUTION UNIT MISC CONTROLLER ARM946E S CORE 16KB ICACHE 16KB DCACHE CLOCK RESET GENERATOR SYSTEM BUS ARBITER MAC USB2 0 EXTERNAL DMA CONTROLLER 4CH PVC HPVC 512x8 4096x16 LSU I F PULSE WIDTH MODULATOR ENGINE CONTROLLER MOT OR CONTROLLER 128x16 x2 ADC 3CH ADDR DATA MUX SFR Bus System Bus INTERRUPT CTRL 5CH TIME CONTROL UNIT ENGINE Comm I F EPI SYSMAC SYSTEM PLL 120MHz ARB...

Page 26: ...od The THV PWM Active is transfer active signal It detects the resistance by recognizing the voltage value F B while permits the environmental recog nition voltage Outputting voltage Controlling method The transfer output voltage is outputted and controlled by changing the duty of THVPWM signal 10 Duty 650V 90 Duty 5KV 5 2 Charge Voltage MHV Inputting voltage 24 V DC 15 Outputting voltage 1 3KV 1 ...

Page 27: ...ower 120V exclusive America 220V exclusive Europe and 220V for china nations with instable power supply 1 AC Input Inputting rated voltage AC 220V 240V AC 120V AC 220V Inputting voltage fluctuating range AC 198V 264V AC 90V 135V AC 198V 264V Rated frequency 50 60 Hz Frequency fluctuating range 47 63 Hz Inputting voltage Under 4 0Arms 2 0Arms The state when lamp is off or rated voltage is inputted ...

Page 28: ...ser HEAT LAMP gets heat from AC power The AC power controls the switch with the Triac a semicon ductor switch The On Off control is operated when the gate of the Triac is turned on off by Photo triac insulting part In the other words the AC control part is passive circuit so it turns the heater on off with taking signal from engine control part When the HEATER ON signal is turned on at engine the ...

Page 29: ...ensor after certain time The feed sensor cannot be Off After the leading edge of the paper passes the feed sensor the paper cannot reach the exit sensor after certain time The exit sensor cannot be On The paper exists between the feed sensor and the exit sensor 4 6 1 3 Jam 2 After the tailing edge of the paper passes the feed sensor the paper cannot pass the exit sensor after certain time 4 6 2 Dr...

Page 30: ...r is on and after 0 92 second it has not reached the 160 C during 20 seconds 2 From the 2 consecutive pages it has been 20 C lower than the fusing temperature over 4 seconds Over heat error the error is not displayed immediately when 68 All LED are flashing it has been over 220 C over 3 seconds The temperature after the 3 seconds is checked If it is over 240 C it is error If the temperature has be...

Page 31: ...sfied the status bit of the LSU controller register becomes 1 to be judged that the LSU is ready If two conditions are not satisfied the error shown in below occurs Toner Toner Air Layer Holgen Lamp Paper Pressure Roller Heat Pipe Heating Wire Paper 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 The...

Page 32: ... 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 comp...

Page 33: ...tte out of the printer 2 Remove the Front Cover in the direction of arrow 3 Remove four screws 4 Unlatch the front ends of the Top Cover 5 Remove the Top Cover in the direction of arrow 6 Remove the Rear Cover from the Top Cover Cassette Top Cover Rear Cover Front Cover 5 2 Top Cover ...

Page 34: ...four screws 3 Remove two screws and take the Thermostat out of the Fuser 4 Remove two screws and take the Halogen Lamp out of the Heat Roller 5 Remove one screw and take the Idle Gear out 6 Remove four screws and divide the Fuser into two parts 7 Remove the Thermister from the Fuser Cover Idle Gear Fuser Cover Fuser Ass y Thermostat Halogen Lamp Heat Roller 5 3 Fuser 5 3 1 Fuser 110V Thermister ...

Page 35: ...e you remove the Fuser you should remove Top Cover see page 5 2 2 Unplug two connectors Block from the boards then remove four screws 3 Remove two screws and take the Thermostat out of the Fuser 4 Remove two screws 5 Remove one screw and take the Idle Gear out Fuser Ass y Idle Gear Thermostat ...

Page 36: ...ssembly in direction of the arrow while pulling the both side of the unit brush Caution Be careful not to damage or contaminate the surface of the roller when assembling disassembling the heat roller 7 Unplug Thermister Harness from the Fuser cover 8 Remove one screw and separate Thermister from the inter connector Fuser Cover Thermister Harness Thermister Fuser Cover Unit Brush Heat Roller ...

Page 37: ...earing and Exit Roller as shown below Exit Gear Bearing Exit Roller 1 2 5 4 Exit Roller 5 5 LSU 1 Before you remove the Fuser you should remove Top Cover see page 5 2 2 Remove two screws and unplug one connector from the Frame 3 Remove the LED PBA Ass y as shown below 4 Unplug two connector from the LSU 5 Unplug four screws and take the LSU out LSU LED PBA Cover ...

Page 38: ...ve 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 6 Fan 5 7 Driver Ass y 1 Before you remove the Fuser you should remove Top Cover see page 5 2 2 Remove the six screws from the Drive Ass y 3 Unplug one connector from the Driver Ass y Drive Ass y ...

Page 39: ...en screws securing from the Engine Shield Ass y and unplug the all connec tors Then take the Engine Shield Ass y Engine Shield Ass y 5 8 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 2 Unplug one connector and remove five screws from the Main PBA Then lift the Main PBA out as shown below Main PBA ...

Page 40: ...remove the Fuser you should remove Top Cover see page 5 2 Engine Shield Ass y see page 5 8 2 Unplug one connector and remove three screws then take the Inlet Ass y out 3 Remove one screw and unplug one connector from the Main PBA 4 Remove three screws and take The SMPS out Inlet Bracket SMPS ...

Page 41: ...d remove Top Cover see page 5 2 LSU see page 5 6 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 Bush and remove it Then lift the Transfer Roller out as shown below Transfer Earth PTL Holder PTL Lens Transfer Roller Bush ...

Page 42: ... page 5 7 2 Pull up the Feed Idle Bush and Feed Idle Shaft as shown below 3 Remove three screws from the Feed Bracket and take it out 4 Remove the Idle Gear and Feed Gear2 5 Remove the Feed Gear 1 Ass y as shown below 6 Remove the Feed Roller and Feed Roller 1 as shown below Bush Feed Idle Shaft Feed Bracket Feed Gear2 Idle Gear Feed Gear1 Ass y Feed Roller1 Feed Roller ...

Page 43: ...ick up Gear Ass y as shown below 3 Remove the Pick up Ass y as shown below Pick up Gear Ass y Pick up Ass y 1 2 Bush 5 13 Pick Up Roller 5 14 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 Pick Up Roller see page 5 11 2 Remove two screw then remove The Manual Solenoid and Pick Up Solenoid Pick up Solenoid Ma...

Page 44: ...NEW CRU 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 TE...

Page 45: ...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 turned off to minimize the power consumption Code State Description 60 62 68 Fuser Error The error in the fuser occurred There is a short circuit in the thermistor and the thermostat while printing Low Temperature Error occurs 60 O...

Page 46: ...on High voltage probe should be used 02 Transfer High Voltage On THV 1000 voltage output by MHV terminal Caution High voltage probe should be used 03 Transfer High Voltage Reference on THV 800 voltage output by MHV terminal Caution High voltage probe should be used 04 DEV supply High Voltage DEV Supply High Voltage Test The left one of the three LEDs in the self test panel is on when DEV high volt...

Page 47: ...emperature of the fuser is up to Printing Mode If you press the button once more the left LED is on and temperature of the fuser is up to overheat Mode 11 Hot Burn Test If the enter button pressed the printer is continuously printing without detection Turn the power off to stop operation 12 Cleaning Mode Print Mode Print the paper to clean the OPC Drum in the Cartridge 13 THV TRIGGER ALL HV All hi...

Page 48: ...urn the power on while pressing this button 89 shows in the DCU and the printer is warming up After warming up the printer is in READY Mode and 88 shows in the DCU In this mode without any detection the printer begins printing trial printing and data from the PC It is convenient to use this mode when the engine malfunction is detected in the control board ...

Page 49: ... Sensor Feed Sensor MP Sensor PTL PIC K R PR CR DR SR TR FR Empty Sensor OPC L S U Fuser Toner Cartridge EXIT Sensor Feed Sensor MP Sensor 1 After taking order the printer feeds the printing paper from the cassette or manual feeder 2 The fad paper passes the paper feeding sensor Jam 0 occurs if the sensor is not operated after certain time passes 3 The paper passed the paper feeding sensor moves t...

Page 50: ... the control panel lights red Find and remove the jammed paper If it is invisible look inside the printer 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 if there is resistance and the paper does not move immediately stop pulling Continue with the next step 2 O...

Page 51: ...r 4 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 missfeed paper by pulling it out by the visible edge from the tray Make sure that all of the paper is proper ly 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 J...

Page 52: ...ides 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 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 s...

Page 53: ...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 2 The Demo page or the configuration sheet shows the printer s current configuration Dem...

Page 54: ...th 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 takes some ti...

Page 55: ...er Roller 60 000 Pages Fuser 60 000 Pages Toner Cartridge 3 000 Pages 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 ...

Page 56: ...black image 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 3mm image ghost 6 Heat Roller 64 1mm 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 Roller Supply Roller Developi...

Page 57: ...6 14 ALIGNMENT A D J U S T M E N T S Samsung Electronics Training Manual ...

Page 58: ...gital Printer Digital Printer Digital Printer Digital Printer Check and Cause Solution 1 Foreign matter stuck onto the window of internal lenses of LSU mirror 2 Foreign matter or toner particles between the developer roller and blade In case the life of the developer has been expired white lines or light image occur in front of the image 3 It may occur when Burr and foreign sub stances are on the ...

Page 59: ...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 matte 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 or black spots occur elsewhere the...

Page 60: ...dge and try to print out 3 Wait 30 minutes after printer is powered on before you start printing 4 Clean up the contaminated area by the toner 5 Replace the HVPS if the problems are not solved by the above four directions 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 No ch...

Page 61: ...iption 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 Does character exist less than 2 per a page and hasn t it been used long time 2 Does recycle paper be used 3 Has the life span of the developer ended 4 Is the movement Up and Down of the transfer roller smooth 5 Is the HVPS no...

Page 62: ...0 C 1 Clean the terminals when contaminated by toner particles 2 Occur in the developer cartridge replace the developer and try to print out 3 Replace the engine board if not solved by the above directions 1 2 4 If not solved by the direction 3 check the transfer roller lifetime and replace it 5 Wait about 1 hour after power on before using printer 7 1 10 Ghost 2 Description Ghost occurs at 75 5 m...

Page 63: ...Printer DigitalPrinter DigitalPrinter DigitalPrinter DigitalPrinter DigitalPrinter 47mm Check and Cause Solution The temperature of the fuser is maintained high 1 Disassemble the fuser and remove the contaminated toner particles on the roller and clean the foreign matter between Thermistor and Heat roller Caution can be deformed 7 1 13 Satins on the Face of Page Description The background on the f...

Page 64: ...area not to be deformed 7 1 15 Blank Page Print 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 devel oper Remove contamination of the terminals of the developer and the unit 7 1 16 Blank Page Print out 2 Description 1 Blank page is printed 2 One or several blank pages...

Page 65: ...de pad 3 Check the surface of the roller pickup for foreign mat ter 4 If the paper feeds into the printer rand Jam 0 occurs perform DCU to check feed sensor of the engine board 1 Replace the solenoid 2 Replace the side pad Assembly L or R if necessary 3 Clean with soft cloth dampened with IPA Isopropyl Alcohol or water 4 Replace the SMPS HVPS and or Sensor 7 2 2 JAM 0 Description 1 Paper is not ex...

Page 66: ...d in the Fuser Roller This occurs when a Guide claw is broken away or transformed It occurs when the Spring of a Guide claw is broken away or transformed It occurs when the Heat Roller or Pressure Roller is seriously contaminated with the toner 3 Paper is accordion in the fuser 1 Check if the exit sensor actuator is defective Check if the actuator exit is unformed Check if the lever part is unform...

Page 67: ...Use the smooth paper 7 2 6 Paper rolled in the Fuser Description If contaminated at intervals of 57mm on the back of a paper Check and Cause Solution 1 Contamination of the pressure roller or heat roller Background Hot off set 2 Check the claw of the fuser whether it is unfit ted 1 After disassembling the fuser clean contami nation between the heat roller and the ther mostor and remove the contami...

Page 68: ...er is rolled up in the OPC Check and Cause Solution 1 Paper is too much thin 2 The face of paper is curled 1 Recommend to use normal paper 2 How to remove the rolled 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 ...

Page 69: ...properly 4 Check if the overheat circuit works properly 5 The fuser gear is defective due to melting away 1 If the thermostat is open replace the fuser and check following items 2 If the thermistor sensor device is located deep in the sponge replace the fuser 3 Check if the circuit of overheat mode works properly 4 Run DCU mode Perform DCU diagnostic code 10 5 Replace Fuser 7 3 2 All LEDs blinking...

Page 70: ...panel is on even when paper is loaded in the cassette Check and Cause Solution 1 Bending or deformation of the actuator of the paper sen sor 2 The function of the engine board is defective Perform DCU mode Perform DCU diagnostic code 8 1 Replace the defective actuator 2 Replace the engine board 7 3 5 Paper Empty without indication Description The paper lamp on the operator panel does not come on w...

Page 71: ...es of the Cover Open Error 1 Replace the hook lever if defective 2 Check the insertion of the Cover Open S W Connect 3 Replace the Main Control board or Cover Open S W 7 3 7 No lamp on when the cover is open Description The ERROR lamp does not come on even when the printer cover is open Check and Cause Solution 1 Check the connector CN8 and circuit of the cover switch department in the Main Contro...

Page 72: ... 00 and Check the motor operation 1 Check the motor harness replace it if defective 2 Replace the SMPS if necessary 7 3 9 No Power Description When system power is turned on all lamps on the operator panel do not come on Check and Cause Solution 1 Check if the power input and SMPS output are normal 2 Check the inferiority of LED Panel on the front cover if the LED of Panel does not appear after no...

Page 73: ...tical Line Getting Curved Description When printing vertical line gets curved Check and Cause Solution 1 If the supply of 24v is unstable in the Main Control board linking with LSU check drive by DCU Mode LSU Check 05 LSU Motor on 1 Replace LSU 2 Replace the Main Control board ...

Page 74: ...r When 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 f...

Page 75: ...er is fallen on the paper periodically 1 Check the cycle of the falling of the toner 2 Check the appearance of both ends of the developer OPC drum 2 The center of the printed mat ter is contaminated with toner 1 Check whether foreign sub stances or toner are stuck to the terminal contact point of the developer 2 Check whether the state of the terminal assembly is normal 1 All of 1 2 3 above If it ...

Page 76: ...er foreign sub stance or toner are stuck to the terminal contact point of the developer 2 Check whether the state of the terminal assembly is nor mal 1 In case of 1 above Run OPC Cleaning Mode Print 4 5 times repeatedly to remove Especially check foreign sub stance on the OPC surface then remove them with a clean gauze moistened with IPA Isopropyl Alcohol not to damage OPC if necessary Never use u...

Page 77: ...DCU to check the Error Status 2 Replace the printer cable If the problems not solved even after the cable replaced check the amount of the remaining tone refer to Toner Cartridge Service 7 4 3 Check if the connection between PC and printer port is proper If you use windows check if the printer dri ver in the controller is set up If the printer driver is properly set up check in which program the p...

Page 78: ...roblem rather than the RAM problem In this case provide more space for the hard disk Secure more space using the disk utilities program 2 The connection of the cable and printer port is not proper Check if the connection is properly done and if the parallel port in CMOS is rightly set up 3 As a printer port Select ECP or SPP among SPP Normal ECP and EPP modes increase print ing speed SPP normal mo...

Page 79: ...e parallel port in the CMOS SETUP 2 Printer Driver Error 3 Error message from insufficient memory The printing job sometimes stops or due to insufficient virtual memory but it actually comes from the insuffi cient space of the hard disk 1 Select SPP Normal or ECP LPT Port the among ECP EPP or SPP in the CMOS Setup 2 Check the printer in My Computer to see if the printer driver is compatible to the...

Page 80: ...1 Delete the unnecessary files to provide more space to start printing job 2 If there are some files with the extension name of jnl Delete them and Reboot the Windows to restart printing job 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 reinstal...

Page 81: ...LODED VIEW PARTS LIST Training Manual 8 Exploded Views and Parts List 5 1 Main Assembly page 5 2 5 2 Frame Unit Assembly page 5 4 5 3 Drive Unit Assembly page 5 7 5 4 Fuser Unit Assembly page 5 8 5 5 Cassette Unit Assembly page 5 10 ...

Page 82: ...ARTS LIST Samsung Electronics Training Manual 8 1 Main Assembly 0 9 6 7 8 2 2 2 3 2 4 2 5 2 6 2 6 16 16 1 16 2 5 2 1 2 7 2 10 1 2 10 17 11 1 11 11 2 11 3 11 4 11 5 11 3 12 4 13 14 1 14 2 14 3 14 14 4 Toner Cartridge 3 15 ...

Page 83: ... 1400 JC39 00242A 1 10 ELA HOU RX DRIVE 1400 JC96 02733A 1 11 MEA ETC COVER FRONT JC97 01746A 1 11 1 COVER FRONT JC63 00103A 1 11 2 ADJUST MANUAL L JC70 00302A 1 11 3 ADJUST RACK MANUAL JC70 00304A 1 11 4 GEAR RACK_PINION JC66 00387A 1 11 5 ADJUST MANUAL R JC70 00303A 1 11 6 SCREW TIPTITE 6003 000264 3 12 MEA ETC CASSETTE 1400 JC97 01750A 1 13 PBA CONTROLLER SPL TBD 1 14 MEA ETC SHIELD ENGINE JC96...

Page 84: ...sembly 0 1 2 4 3 5 6 7 12 6 9 53 9 51 13 14 15 16 17 57 18 19 20 20 21 22 23 24 25 26 37 31 27 28 29 29 30 58 58 1 58 2 58 3 58 4 58 5 58 6 58 6 58 4 40 41 56 42 44 53 45 46 47 48 59 59 1 59 2 59 3 59 4 50 52 52 54 55 11 10 8 35 36 Transfer Roller 38 39 43 32 34 33 49 49 3 49 2 49 1 ...

Page 85: ...D_ROLLER IDLE JC70 00315A 1 22 PMO PLATE GUIDE DEVE_L JC72 00984A 1 23 PMO ACTUATOR FEED JC72 00976A 1 24 PMO ACTUATOR EMPTY JC72 00975A 1 25 PMO ACTUATOR MANUAL JC72 00977A 1 26 IPR GROUND EARTH TR JC70 00309A 1 27 SPRING TR_R 6107 001162 1 28 ROLLER FEED ROLLER1 JC66 00526A 1 29 PMO BUSHING TX JC72 00382A 5 30 ROLLER FEED JC61 00347A 1 31 SPRING ACT MANUAL 6107 001165 1 32 IPR EARTH TRANSFER JC7...

Page 86: ...0 00311A 1 52 SHAPT FEED JC66 00398A 1 53 RING CS 6044 000001 3 54 GEAR FEED 2 JC66 00394A 1 55 GEAR IDLE 23 JC66 00396A 1 56 GUIDE PAPER JC61 00718A 1 57 RMO RUBBER_FOOT JC73 00027A 2 58 1 58 1 BUSH PICK_UP_L JC61 00586A 1 58 2 SHAFT PICK_UP JC66 00399A 1 58 3 STOPPER PICK_UP JC61 00593A 2 58 4 PMO IDLE PICK_UP JC72 00982A 2 58 5 SPONGE ROILLER PICK UP JC72 01231A 1 58 6 BUSH PICK_UP_R JC61 00587...

Page 87: ...C96 02733A 1 1 BRACKET GEAR 1400 JC61 00598A 1 2 GEAR FUSER DRV JC66 00388A 1 3 GEAR RDCN Z132 19 JC66 00391A 1 4 GEAR PICK_UP DRV JC66 00389A 2 5 RING E 6044 000231 2 6 BRACKET MOTOR 1400 JC61 00599A 1 7 GEAR RDCN Z7128 JC66 00390A 1 8 GEAR RDCN Z7322 JC66 00392A 1 9 MOTOR STEP 7 5 JC31 00028A 1 Drive Unit Assembly Parts List SA Service Available O Service available X Service not available ...

Page 88: ...8 8 EXPLODED VIEW PARTS LIST Samsung Electronics Training Manual 8 4 Fuser Unit Assembly 0 1 2 3 4 5 32 32 6 33 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 31 22 23 24 25 26 27 30 28 29 ...

Page 89: ...A 1 15 CBF HARNESS FUSER 1 JC39 00239A 1 16 GEAR FUSER_HTN JC66 00564A 1 17 BUSH HR_L JC61 00589A 1 18 NPR ROLLER_HEAT JC66 00601A 1 19 BUSH HR_R JC61 00590A 1 20 LAMP HALOGEN 110V 4713 001155 1 110V 21 ROLLER EXIT F_UP JC66 00380A 1 22 MEC ROLLER_PR 1400 JC66 00600A 1 23 BEARING PRESSURE JC66 10901A 2 24 SPRING PR 1400 6107 001168 2 25 PMO BUSHING TX JC72 00382A 3 26 HOLDER ACTUATOR JC61 00581A 1...

Page 90: ...8 10 EXPLODED VIEW PARTS LIST Samsung Electronics Training Manual 8 5 Cassette Unit Assembly 0 1 2 3 4 5 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ...

Page 91: ...0580A 1 7 SPRING FRICTION PAD JC61 70911A 1 8 ROLLER IDLE FEED JC66 00529A 2 9 SPRING FEED 6107 001047 2 10 PMO PLATE_LOCKER JC72 00972A 1 11 SPRING LOCKER JG61 70531A 1 12 ADJUST CASSETTE_L JC70 00300A 1 13 ADJUST CASSETTE_R JC70 00301A 1 14 GEAR PINION JG66 40003A 1 15 INDICATOR LEVER INDICATOR JC64 00040A 1 16 RPR FRICTION PAD JC73 00140A 1 17 IPR PLATE PAD JC70 00314A 1 18 RPR PAD CASSETTE JC7...

Page 92: ...B2 0 Net2270 Crystal 14 74 MHz Freq Spread Video Clock VOLTAGE DETECTOR MOTOR DRIVER Power On Reset Controller Block SMPS Block HEATER AC 24V 5V 3 3V GND Crystal 12MHz Freq Spread EEPROM FEED SENSOR P EMPTY SENSOR MP SENSOR Main Clock EXIT SENSOR THVPWM BLASPWM MHVPWM 24V Cover open Switch PANEL B D PTL LSU FAN 2 LED 1KEY Font ROM 16MB FLASH MEMORY 2MB SDRAM 8MB SPGPm ARM946ES HVPS Block MHV OPC G...

Page 93: ... 24V 5V 3 3V FAN POWER CORD Crystal 12MHz Main Clock Power On Reset SMPS Main 26p CPU Jupiter 4 24V Main Motor C CLUTCH USB HEATER AC SMPS PART s COVER OPEN SW CN8 CN8 CN11 CN6 CN1 CN3 CON4 CON1 CN2 CN9 HVPS PART S VOLTAGE DETECTOR PTL LSU PANEL B D 2 LED 1KEY MHV OPC GND SUPPLY DEV THV FUSER ASS Y M CLUTCH MOTOR DR PART S FLASH MEMORY 0 5MB 128Kx32bits ARM7 90MHz Video Clock LD SSCG ...

Page 94: ...DY EXT_CLK HSYNC 3 3V LD_ON VDO GND LSU POLYGON MOTOR LD DIODE LED_ERROR LED_DATA KEY_DEMO 1 2 3 3V PTL 1 2 CN9 CN6 CN5 SMPS HVPS 3 3V GND 3 3V 3 3V GND 3 3V 3 3V GND 3 3V 24V GND 24V 24VS 24V GND 24V 24V GND 24V Exit Sensor 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 FUSER ON 24VS BIAS PWM Manual Sensor CN5 GND 1 2 24V M_Clutch 1 2 CN7 1 2 24V C_Clutch Cassette Clutch PTL...

Page 95: ... 3 3V 24V GND 24V 24VS 24V GND 24V 24V GND 24V E xit Sensor FUSER ON HVPS 24VS BIA S PWM SPL MAIN BOARD FR 4 2Layer 4PIN CONN ECTOR for USB USB CABLE 3 3V DCU_DATA 1 2 3 4 1 2 3 4 DCU_CLK GND Manual Sensor CN5 GND 24V M_Clutch 1 2 24V C_Clutch 1 2 FAN PANEL THV PWM THV Eanble THV Read MHV P WM FAN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 1 2 3 4 5 6 7 8 9 10 11 12 13 14...

Page 96: ...1 1 11 1 Samsung Electronics SCHEMATIC DIAGRAMS Repair Manual 11 Schematic Diagrams 11 1 PCL Main Circuit Diagram 1 7 ...

Page 97: ...11 2 SCHEMATIC DIAGRAMS Samsung Electronics Repair Manual PCL Main Circuit Diagram 2 7 ...

Page 98: ...11 3 Samsung Electronics SCHEMATIC DIAGRAMS Repair Manual PCL Main Circuit Diagram 3 7 ...

Page 99: ...11 4 SCHEMATIC DIAGRAMS Samsung Electronics Repair Manual PCL Main Circuit Diagram 4 7 ...

Page 100: ...11 5 Samsung Electronics SCHEMATIC DIAGRAMS Repair Manual PCL Main Circuit Diagram 5 7 ...

Page 101: ...11 6 SCHEMATIC DIAGRAMS Samsung Electronics Repair Manual PCL Main Circuit Diagram 6 7 ...

Page 102: ...11 7 Samsung Electronics SCHEMATIC DIAGRAMS Repair Manual PCL Main Circuit Diagram 7 7 ...

Page 103: ...11 8 SCHEMATIC DIAGRAMS Samsung Electronics Repair Manual 11 2 SPL Main Circuit Diagram 1 5 ...

Page 104: ...11 9 Samsung Electronics SCHEMATIC DIAGRAMS Repair Manual SPL Main Circuit Diagram 2 5 ...

Page 105: ...11 10 SCHEMATIC DIAGRAMS Samsung Electronics Repair Manual SPL Main Circuit Diagram 3 5 ...

Page 106: ...11 11 Samsung Electronics SCHEMATIC DIAGRAMS Repair Manual SPL Main Circuit Diagram 4 5 ...

Page 107: ...11 12 SCHEMATIC DIAGRAMS Samsung Electronics Repair Manual SPL Main Circuit Diagram 5 5 ...

Page 108: ...N4148 R206 180K F CON2 17 7 R207 330K F THV THV 50K R307 150K THV sen R213 MGR1 2W 100MF 4 THV READ CON2 18 6 C302 103 IT 01 1 D301 D1NL20U R303 470 Q202 C945C Y C201 473 5V INDEX 50K C307 473 C202 102 D305 1N4148 24VS 5V C212 2KV 221 D201 1N4148 C306 473 TNR203 5N431K ZD201 2 7V THV sen R208 10K R201 430 TNR202 5N431K R211 1 4W 4 7 R210 5 6K R302 470K 5 C205 473 U102 A KA324 3 2 1 U102 B KA324 5 ...

Page 109: ...8M OUT 5V ZD503 200V C501 473 R508 470 C503 681 R502 22K Q403 C2316 U102 D KA324 12 13 14 IN R504 10K CON2 20 R503 330KF C508 103 R409 1 4W 4 7 Q501 A708 Y ZD403 130V 2 D404 4KV R401 47K U102 C KA324 10 9 8 4 24VS 5V C510 3KV 101 R402 22K R412 30KF C406 103 MHV sen CON2 19 5 D502 1N4148 R405 10K D504 4KV Q401 A708 Y C409 3KV 471 R406 5 6K C404 472 Q503 C2316 2 5V DEV 20K MHV 20K R511 MGR1 2W 10MF ...

Page 110: ...4007 R111 1 8K F 1 CON1 1 2 R113 NU Source 10 24VS F2 250V 2A Drain C103 35V 47uF PT1 C106 1KV 102 11 R8 680 CON2 10 11 12 STR G6353 R101 22 C10 630V 333 LF2 2003 CON2 7 8 9 OCP FB C2 222MAD PWM CONTROL DGND R110 220 R2 1 4W75K D101 102 200V 3A 2 U2 TH1 SCK 054 3 3V1 0A R9 1W0 6 R12 1W 180 FUSIBLE R3 1 4W75K DSS 401M R105 1 2W 3 3K C4 104 C3 222MAD BD1 SW2 LF1 1007 CON2 1 2 3 C108 50V 1uF C12 332M...

Page 111: ...115 150 R117 150 CON2 24 FAN 1 2 R118 47K 2 OP102 ITR 8406S CON4 3 C111 104 CON2 15 MANUAL 35301 0350 35303 0550 5 CON2 23 KEY DEMO R120 5 6K 4 CON2 26 EXIT R119 2 2K 3 3 24VS 2 2 1 4 CON2 21 LED ERROR OP101 ITR 8406S 1 3 3 3V D105 1N4003 1 R116 47K CON3 3 3V CON2 22 LED DATA Q101 KSC1008 Y 4 ...

Page 112: ...RROR DCU 68 On Line Error and Toner Save alternately light red and green for 4 seconds Check the fuser assembly Controller SMPS and AC wire LOW HEAT ERROR DCU 62 LSU ERROR On Line Error and Toner Save alternately light green and green for 1 second Check the LSU Controller and Harness LSU NOT READY ERROR PMOTOR ERROR DCU 95 Main motor stops right after paper is feeded Then On Line Error and Toner S...

Page 113: ...On Line Error Lights red Check the Feed Sensor and Controller JAM1 DCU 72 On Line Error Lights red Check the Exit Sensor Fuser Ass y and Controller JAM2 DCU 73 Item Phenomenon Measurement DCU COVER OPEN On Line Error Lights red Check the cover open switch DCU 64 PAPER EMPTY On Line Error Lights red Check if there are papers in cassette DCU 70 ...

Page 114: ...Dev On Supply DEV Dev Off 0 630V 0 430V 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 HotBurn HotBurn On 12 Clean Print Clean Printing 13 Thv Reference low adequate high 14 PTL PTL On PTL Off 15 FAN Fan On Fan Off 16 Manual PickUp Manual Pickup On Manual Pickup Off 17 Manual Sensor Ma...

Page 115: ...2003 01 ...

Page 116: ...ectronics Co Ltd January 2003 Printed in Korea VERSION NO 1 00 CODE JC 0084A 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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Summary of Contents for ML-1755

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Samsung ML-1755, Service Manual, Page: 36 / 116

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Summary of Contents for ML-1755

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