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Samsung ML-1740/XSH Service Laser Printer Ml-1740/Xsh Manual Download Page 29

4-12

S U M M A RY  OF  PRO D U C T

Samsung Electronics

Service Manual

4.4 SMPS & HVPS

The SMPS supplies the DC power to the system.
It takes 110V/220V and outputs the +3.3V, +5V and +24V to supply the power to the main board and ADF
board.
The HVPS part creates the high voltage of THV/MHV/Supply/Dev and supplies it to the developer part for
making the best condition to display the image. The HVPS part takes the 24V and outputs the high voltage
for THV/MHV/BIAS, and the outputted high voltage is supplied to the toner, OPC cartridge, and transfer
roller.

MAIN PBA CON.

CN3

(FAN CON.)

CN1

(H/L CON.)

F101

250V L2A

EXIT SENSOR

CN4

(PANEL CON.)

MHV OPC

DEV

SUPPLY

THV

COVER OPEN SWITCH

MANUAL SENSOR

FEED SENSOR

PAPER-EMPTY SENSOR

F1

 110V : 125V/8A

220V : 250V T 5A H

F2

 110V : 125V/3A

220V : 250V 2A H

Summary of Contents for ML-1740/XSH

Page 1: ...TER 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 Basic Model ML 1740 ...

Page 2: ...ctronics Co Ltd December 2003 Printed in Korea VERSION NO 1 00 CODE JC 0117B This service manual is also provided on the web the ITSELF system f Samsung Electronics Co Ltd http itself sec samsung co kr ELECTRONICS ...

Page 3: ...2003 12 ...

Page 4: ...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 5: ...d 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 plas tic 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 6: ... 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 information needed to keep has to be written down 2 Before ...

Page 7: ...oam to prevent electrostatic charge buildup in the vicinity 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 static can generate electrical charges sufficient to damage ESDs 5 Do not use Freon propelled chemicals When sprayed these can generate electrical charges su...

Page 8: ...rol Unit Standard Test equipment to diagnose the Laser 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 Tweezers Standard For general home use small typ...

Page 9: ...ice 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 Laser Beam Printer LCD ...

Page 10: ...le Pattern for the Test The sample pattern shown in below is the standard pattern used in a factory The contents of the life span and the printing speed are measured with the pattern shown in below The picture in the manual is 70 size of the actual A4 size 2 3 1 A4 5 Pattern ...

Page 11: ...2 4 REFERENCE INFORMATION Samsung Electronics Service Manual 2 3 2 A4 2 Pattern ...

Page 12: ...2 5 Samsung Electronics REFERENCE INFORMATION Service Manual 2 3 3 A4 IDC Pattern ...

Page 13: ...2 6 REFERENCE INFORMATION Samsung Electronics Service Manual ...

Page 14: ...ower on boot 30 seconds or less First Print Out Time 12 seconds Ready to 1st page out Media Size 76 X 127 3 X 5 mm to 216 X 356 8 5 X 14 mm Media Thickness 16 24 lb Dimension W X D X H 361 2 X 372 3 X 197 7 mm Weight Net 7 Kg 15 4 lb Gross 9 5 Kg Max Acoustic Noise Stand by Less than 35 dB Printing Less than 50 dB Power save mode Available Toner save mode Available Duty Cycle Monthly 15 000 pages ...

Page 15: ...face USB 1 1 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 ITEM DESCRIPTION Input Voltage Nominal input voltage 127 VAC Input voltage range 90 132 VAC Nominal frequency 50 60 Hz Frequency tolerance 3Hz Power Consumption Printing 280W Avg or less Power Save 10...

Page 16: ...ng 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 127mm 3 X ...

Page 17: ...3 4 Specifications Samsung Electronics Service Manual ...

Page 18: ...ary 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 19: ...4 2 S U M M A RY OF PRO D U C T Samsung Electronics Service 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 20: ... 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 21: ...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 22: ... D U C T Service 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 23: ...ler 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 220V Heat Lamp type or Q PID type Fuser 4 2 4 1 Temperature Intercepting Device Thermostat The thermostat is the temperature intercepting device...

Page 24: ... 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 25: ...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 26: ...eo 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 are directly inputted to the main board ASIC SDRAM FLASH MEMORY MOTOR DRIVER IC BUFFER VIDEO CLK 14 7456MHz USB CO...

Page 27: ...ms 4 3 2 Flash Memory It stores the system program 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 Access Time 60 nsec 4 3 4 Sensor input circuit 1 Paper Empty Sensing The Paper empty sensor Photo Interrupter on the engine board informs the state of paper...

Page 28: ...informed to the CPU The paper JAM2 is informed Red 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 solenoid 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 sensin...

Page 29: ...ly Dev and supplies it to the developer part for making the best condition to display the image The HVPS part takes the 24V and outputs the high voltage for THV MHV BIAS and the outputted high voltage is supplied to the toner OPC cartridge and transfer roller MAIN PBA CON CN3 FAN CON CN1 H L CON F101 250V L2A EXIT SENSOR CN4 PANEL CON MHV OPC DEV SUPPLY THV COVER OPEN SWITCH MANUAL SENSOR FEED SEN...

Page 30: ...oller to an OPC drum to recover toners Output Voltage There is no feedback control so change range of output is big up to load Error Toner contamination occurs at a backside of a printed paper 4 Developing Voltage DEV Function It is a voltage to develop a toner with using a difference of electronic potential on an exposed part by LSU Laser Scanning Unit Generally the electronic potential of expose...

Page 31: ...g 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 outputted 2 Rated Power Output 3 Consumption Power 4 Length of Power Cord 1830 50mm 5 Power Switch Use 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...

Page 32: ...m 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 insult ing 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 LED of PC1 Photo Triac tak...

Page 33: ...nsor 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 5 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 5 2 Dri...

Page 34: ...ting 2 consecutive pages it has been lower than 145 C over 4 seconds 3 consecutive page it has been 25 C lower than the fixed fusing temperature over 4 seconds Over heat error It have been higher than 220 C over 3 seconds 68 All LED are blinking Error Description DCU LED Displat Open heat error When preheating it has been lower than 68 C 60 All LED are blinking over 15 seconds Lower heat error Aft...

Page 35: ...ied the sta tus 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 36: ...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 37: ...assette 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 Top Cover Rear Cover Front Cover 5 2 Top Cover ...

Page 38: ...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 Heat Lamp Type Thermist...

Page 39: ...aring 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 40: ...e 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 41: ...n 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 42: ...emove 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 43: ... 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 44: ...the Guide Paper and take it out 3 Pull up the Feed Idle Bush and Feed Idle Shaft as shown below 4 Remove three screws from the Feed Bracket and take it out 5 Remove the Idle Gear and Feed Gear2 6 Remove the Feed Gear 1 Ass y as shown below 7 Remove the Feed Roller and Feed Roller 1 as shown below Guide paper Bush Feed Idle Shaft Feed Bracket Feed Gear2 Idle Gear Feed Gear1 Ass y Feed Roller1 Feed ...

Page 45: ...ine Shield Ass y see page 5 8 2 Remove three screws from the Feed Bracket and take it out 3 Remove the Pick up Gear Ass y as shown below 4 Remove the Pick up Ass y as shown below 5 Remove two screw then remove The Manual Solenoid and Pick Up Solenoid Pick up Gear Ass y Pick up Ass y 1 2 Bush 5 13 Pick Up Roller Solenoid Pick up Solenoid Manual Solenoid Feed Bracket ...

Page 46: ...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 47: ...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 Open Fus...

Page 48: ... 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 voltage Sup...

Page 49: ...ure 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 high volt...

Page 50: ...en the engine malfunction is detected in the control board No Function Enter Up Down Stop Remark 00 Motor Motor Run Motor Stop 01 MHV Mhv On Mhv Off 1550V 02 THV Thv Negative On Thv Negative Off 03 THV Thv On Thv Off 1300V 04 DEV 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 ...

Page 51: ...ensor 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 to the paper ex...

Page 52: ...ble look inside the printer Do not use a pinset or a sharp metal tool when removing a jam The covering of a metal part can be removed which can cause an electric leakage 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 resis tance and the paper does ...

Page 53: ...install 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 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 54: ...e 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 55: ...nce of the abnormality The patterns help to regularly maintain the product 6 4 1 Printing a Demo Page Print a demo page or a configuration sheet to make sure that the printer is operating correctly 1 Hold down the Cancel button for about 2 seconds to print a demo page Hold down the Cancel button for about 6 seconds to print a configuration sheet Demo Page ML 1710 Demo Page ML 1750 ...

Page 56: ...uch Toner Save Button expand DigitAIIValue the life of the toner cartridge by 40 One touch Cancel Button Great Price Great Performance 250 sheets paper cassette Windows 95 98NT 4 0 2000 Me XP DigitAIIcompatibility Macintosh OS 8 6 or later Linux OS including Red Hat Caldera Debian Mandrake Slackware SuSE and Turbo Linux IEEE1284 and USB 1 1 interfaces www samsungprinter com AII other trademarks ar...

Page 57: ...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 take...

Page 58: ...e factors The cycle period given below is for reference only 6 6 The 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 every one second Over Heat Error The Error LED orange and the Toner Save LED are 68 simultaneously flashing every one second Low Heat Error The Error LED red and the Toner Save LED ar...

Page 59: ...r black spot 2 Charge Roller 37 7mm black spot 3 Supply Roller 37 0mm light or dark horizontal image band 4 Developing Roller 35 3mm horizontal image band 5 Transfer Roller 45 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 Develop...

Page 60: ...6 15 Samsung Electronics LIGNMENT DJUSTMENTS Service Manual ...

Page 61: ...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 62: ...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 63: ...ge 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 cha...

Page 64: ...ption 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 nor...

Page 65: ...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 66: ...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 Stains on the Face of Page Description The background on the f...

Page 67: ...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 68: ...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 69: ... 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 unforme...

Page 70: ...se 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 contamin...

Page 71: ...r 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 72: ...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 73: ...anel 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 wh...

Page 74: ...s 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 Control...

Page 75: ...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 nor...

Page 76: ...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 77: ...er 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 ...

Page 78: ...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 79: ...r 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 us...

Page 80: ...CU 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 pr...

Page 81: ...oblem 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 mod...

Page 82: ... 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 83: ...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 84: ... VIEW PARTS LIST Service Manual 8 Exploded Views and Parts List ML 1740 XSH 8 1 Main Assembly page 8 2 8 2 Frame Unit Assembly page 8 4 8 3 Drive Unit Assembly page 8 7 8 4 Cassette Unit Assembly page 8 8 8 5 Fuser Unit Assembly page 8 10 ...

Page 85: ...LODED VIEW PARTS LIST Samsung Electronics Service Manual 8 1 Main Assembly 0 9 6 7 8 2 2 2 3 2 4 2 5 2 6 2 6 15 2 1 2 7 2 8 1 2 10 4 11 1 11 11 2 11 3 11 4 11 5 11 3 12 17 13 14 5 20 19 3 18 16 1 16 3 16 2 16 ...

Page 86: ...UMMINGBIRD LSU JC59 00018A 1 O 7 PBA MAIN PANEL JC92 01439A 1 O 8 COVER PCB HREFRESH JC63 00417A 1 O 9 CBF HARNESS LSU JC39 00242A 1 O 10 ELA UNIT RX DRIVE JC96 02733A 1 O 11 MEA UNIT COVER FRONT USA JC97 01903A 1 O ML 1740 11 1 COVER FRONT HREFRESH JC63 00415A 1 O ML 1740 11 2 ADJUST MANUAL L HREFRESH JC70 00476A 1 O 11 3 ADJUST RACK M MANUAL JC70 00304A 2 O 11 4 GEAR RACK_PINION JC66 00387A 1 O ...

Page 87: ...y 0 1 2 4 3 5 6 7 61 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 60 39 43 32 34 33 62 49 49 3 49 2 49 1 ...

Page 88: ...L CON JC70 00312A 3 O 15 IPR P TERMINAL CR JC70 00313A 1 O 16 HOUSING TERMINAL JC61 00592A 1 O 17 PMO LOCKER CST JC72 00983A 2 O 18 PMO ACTUATOR CVR OPEN JC72 00974A 1 O 19 PMO PLATE GUIDE DEVE_R JC72 00985A 1 O 20 SPRING ETC GUIDE DEVE JC61 70932A 2 X 21 IPR P GROUND_GUIDE PAPER JC70 00458A 1 O 22 PMO PLATE GUIDE DEVE_L JC72 00984A 1 O 23 PMO ACTUATOR FEED JC72 00976A 1 O 24 PMO ACTUATOR EMPTY JC...

Page 89: ...72 00979A 1 O 49 3 SPRING CS 6107 001168 1 X Spring Pick up gear 50 BRACKET P FEED JC61 00602A 1 O 51 IPR P GROUND_TR JC70 00311A 1 O 52 SHAFT FEED JC66 00398A 2 O 53 RING CS 6107 001169 3 X 54 GEAR FEED 2 JC66 00394A 1 O 55 GEAR IDLE 23 JC66 00396A 1 O 56 GUIDE P PAPER JC61 00718A 1 O 57 FOOT FRONT JC61 00836A 2 X 58 AS PICK UP JC81 01693A 1 O 58 1 BUSH M PICK_UP L JC61 00586A 1 X 58 2 SHAFT P PI...

Page 90: ...1 00598A 1 X 2 GEAR RDCN 53 26 JC66 00388A 1 X 3 GEAR RDCN 113 33 JC66 00391A 1 X 4 GEAR RDCN 57 18 JC66 00389A 2 X 5 WASHER PLAIN 6031 000023 2 X 6 BRACKET P MOTOR 1400 JC61 00599A 1 X 7 GEAR RDCN 103 41 JC66 00390A 1 O 8 GEAR RDCN 90 31 JC66 00392A 1 O 9 MOTOR STEP HUMMINGBIRD JC31 00028A 1 O 10 PMO IMPELLER_DRV JC72 00825A 1 X Drive Unit Assembly Parts List SA Service Available O Service availa...

Page 91: ...8 8 EXPLODED VIEW PARTS LIST Samsung Electronics Service Manual 8 4 Cassette Unit Assembly 0 1 2 3 4 5 5 6 7 8 9 10 11 15 16 18 12 13 14 17 ...

Page 92: ...1 00580A 1 X 7 SPRING ETC EXIT ROLL FD JC61 70911A 1 X 8 ROLLER M IDLE FEED JC66 00529A 2 X 9 SPRING ES 6107 001047 2 X 10 PMO PLATE_LOCKER JC72 00972A 1 X 11 SPRING ETC LOCKER PLATE JG61 70531A 1 X 12 ADJUST M CASSETTE_L JC70 00300A 1 O 13 ADJUST M CASSETTE_R JC70 00301A 1 O 14 GEAR PINION JG66 40003A 1 X 15 INDICATOR LEVER HREFRESH JC64 00134A 1 O 16 RPR FRICTION PAD JC73 00140A 1 O 17 IPR PLATE...

Page 93: ...8 10 EXPLODED VIEW PARTS LIST Samsung Electronics Service Manual 8 5 Fuser Unit Assembly 0 1 2 35 3 4 5 32 32 6 33 7 8 9 10 12 13 14 15 16 17 18 19 20 21 31 25 26 27 30 28 34 29 22 23 24 11 ...

Page 94: ... X 15 CBF HARNESS FUSER 220V JC39 00238A 1 O 16 GEAR FUSER Z37 JC66 00564A 1 O 17 BUSH M HR L JC61 00589A 1 X 18 ROLLER HEAT JC66 00601A 1 O 19 BUSH M HR R JC61 00590A 1 O 20 LAMP HALOGEN 4713 001183 1 O 220V 21 ROLLER M EXIT F UP JC66 00380A 1 X 22 ROLLER PRESSURE JC66 00600A 1 O 23 BEARING PRESSURE R JC66 10901A 2 X 24 SPRING CS 6107 001169 2 X 25 PMO BUSHING TX JC72 00382A 3 X 26 HOLDER ACTUATO...

Page 95: ...8 12 EXPLODED VIEW PARTS LIST Samsung Electronics Service Manual ...

Page 96: ...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 10MHz Freq Spread EEPROM FEED SENSOR P EMPTY SENSOR MP SENSOR Main Clock EXIT SENSOR THVPWM BLASPWM MHVPWM 24V Cover open Switch PANEL B D LSU FAN 2 LED 1KEY FLASH MEMORY 0 5MB SDRAM 8MB ASIC JUPITER3 HVPS Block MHV OPC GND SUPPLY DEV THV FUSER ASS Y ...

Page 97: ...N3 CN6 CN8 CN9 CN3 CN10 36 PIN 4PIN CONN ECTOR for USB MAIN BOARD FR 4 2L LSU_CLK nLREADY nPMOTOR GND 24VS nHSYNC 5V GND LD_ON VDO LSU_READ 3 3V PTL 24VS M_Clutch P_EMPTY FEED 3 3V 3 3V GND GND 5V GND GND GND 24VS 24VS MANUAL 24VS LED_READY THV_READY LED_ERROR THV_PWM THV_EN BIAS_PWM MHV_PWM LED_TSAVE KEY_IN FAN FUSER_ON EXIT 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...

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