User manual SAMSUNG LASER PRINTER ML-1250 SERVICE MANUAL

[. . . ] LASER PRINTER ML-1200 Series ML-1210 / ML-1250 / ML-1220M SERVICE LASER PRINTER Manual CONTENTS 1. Connection Diagram This service manual is also provided on the web, the ITSELF system Samsung Electronics Co. , Ltd. http://itself. sec. samsung. co. kr © Samsung Electronics Co. , Ltd. : 2. 03 CODE : JC-0051A This manual is stated and provided for service description. All rights reserved. [. . . ] Check the surface of the roller-pickup for foreign matter. 4. If continuous clusters occur, check whether the assembly slot between shaft-pickup and housing-pickup become open or is broken away. If the paper feeds into the printer rand Jam 0 occurs, perform DCU to check feed-sensor of the sensor board. 4. Replace the Housing-Pickup and/or Shaft-Pickup. (Service Parts : Figure 8-135, 8-12, chapter 5) 4-12 Samsung Electronics Troubleshooting 4-3-3 JAM 1 1. Recording paper is jammed in front of or inside the fuser. Recording paper is stuck in the discharge roller and in the fuser just after passing through the Actuator-Feed. If the recording paper is jammed in front of or inside the fuser. (Perform DCU diagnostic code of) PICK UP CARTRIDGE FEED SEN FEED · Description Solution 1. (Service Parts : Figure 10, chapter 5) LSU EXIT 2 EXIT 1 EXIT SENSOR JAM 1 2. If the recording paper is stuck in the discharge roller and the fuser just after passing through the ActuatorFeed, Feed Actuator may be defective. 2. Reassemble the Actuator-Feed and Spring-Actuator if the returning is bad. 4-3-4 JAM 2 · Description 1. Recording paper is jammed in front of or inside the fuser. Recording paper is stuck in the discharge roller and in the fuser just after passing through the Actuator-Feed. If the paper is completely fed out of the printer, but Jam 2 occurs : Exit sensor is defective. · After the paper is completely discharged, actuator Exit should return to the original position to shut the photo-sensor. Sometimes it takes longer hour than it should and does not return. Check if the exit sensor actuator is defective. · Check if the actuator exit is unformed (Check if the lever part is unformed in shape). · Check whether burrs occur in the assembly part of the actuator exit or not and if the actuator is smoothly operated. · Check if foreign matters and wire get caught in the actuator exit's operation. If the paper is stuck in the fuser : disassemble the fuser and remove the jammed paper, and clean the surface of the pressure roller with dry gauze. LSU EXIT 2 CARTRIDGE FEED SEN EXIT 1 EXIT SENSOR PICK UP JAM 2 2. [. . . ] Schematic Diagrams LASER PRINTER 1 MAIN +5V +24V I N- L ET EXI T SENSOR POWER SW TCH I 1. Block Diagram 1. 1 GDI Block Diagram(ML-1210/ML-1220M) Samsung Electronics SMP S FLASH MEMORY ( 0 . 5MB) USB PC SDRAM ( 8MB) IEEE 12 84 CABLE 74LVX 161284 Li ne Transcei ver MOTOR POWER CORD Po we r On Re s e t Eng i ne SOLENOIDE FAN VOL TAGE DETECT OR CPU Jupiter3 S3C46M0X Mai n Clock FS781BZB Vi deo Clock Crystal 10MHz DEV_FUSE LSU P ANE L B' D MHVP WM BI ASPW M THVPWM Osci l l ator 44 MHz 4 L ED MHV OPC GND 3 KEY BUFFER HV PS B' D SUPPL Y DEV TH V BLOCK DIAGRAM Repair Manual 1-1 1-2 BLOCK DIAGRAM 1. 2 PCL Block Diagram(ML-1250) Repair Manual MAIN +5V +24V IN-LET POWER SWITCH Oscillator 48 MHz USB SMPS PC (2MB) IEEE 12 84 CABLE EXIT SENSOR USB Driver USBN9602-28M FLASH MEMORY POWER CORD SDRAM ( 4 MB) MOTOR Power On Reset Eng i ne SOLENOI D FAN DEV_FUSE VOLTAGE DETECTOR CPU Main Clock Option Up to 68MB S3C46C0X01 74ACT273 Devided by 74HC406ON Crystal 6. 7149 MHz Oscillator 20 MHz Video Clock 74HCT273 LSU P ANE L B' D Oscillator 44 MHz 4 L ED MHV OPC GND 3 KEY MHVP WM BI ASPW M THVPWM HV PS B' D SUPPL Y DEV TH V Samsung Electronics 2 DCU SENSOR BOARD CONNECTION DIAGRAM 2. Connection Diagram 2. 1 GDI Connection Diagram(ML-1210/ML-1220M) IEEE1284 COMPATI ABLE CABLE 36 PI N J1 CN9 1 2 3 4 5 6 7 8 9 10 11 +24V_T +24V GND *PMOTOR +3. 3V EXT_C LK * HSYNC +5V +5V GND * LD_ON VDO +5V GND 1 2 3 4 5 1 2 3 4 5 6 POLYGON MOTOR LSU LD DIODE HOST COMPUTER USB CABLE 4PI N CONNECTOR f or USB CN3 CN13 1 2 3 4 5 6 7 8 9 +5V +5V GND LE D_ERROR LE APE D_P R LE ATA D_D LE D_TONE R *K EY_TON ER *K EY_CAN L CE *K EY_DEM O 1 2 3 4 5 6 7 8 9 LED DISPLAY PANEL 1 2 3 4 +5V DCU_DATA DCU_CLK +5V GND 1 2 3 4 CN1 GDI 1 2 3 4 +5V *PEMPTY * FEED +5V GND CN6 2 1 +5V PTL 1 2 PTL LEDARRAY 1 2 3 4 CN7 Main Board COVER SWITCH 1 2 3 +24V Not Use d +24VS 1 2 3 CN11 CN5 THERMI STOR 2 1 THERM _A THERM _B 1 2 CN12 HV PS 1 2 3 4 5 6 7 8 9 +24V_T +24V GND THV PWM *THV _EA THVRE AD * M H VP WM BI ASPW M +5V +5V GND 1 2 3 4 5 6 7 8 9 CN8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 +5V GND +5V +5V GND +5V +5V GND +5V +24V GND +24V +24V GND +24V +24V GND +24V EXIT +24VS FU SER ON +24VS * EGMO _B T1 CLUTCH EGMOT _PHB FA N DE V_FUSE * EGMOT _A1 * NEW_DEVE EGMOT_PHA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 SMPS CN5 FUSER CN502 SOL ENOID CN1 ENGINE S TEPPING TOR MO CN2 CN3 DEV_FUSE FAN CN4 ENG NE + SM I PS Unification B' d Repair Manual Samsung Electronics 2-1 CONNECTION DIAGRAM 2-2 PCL Connection Diagram(ML-1250) IEEE1284 COMPATI ABLE CABLE 36 PI N J1 CN12 1 2 3 4 5 6 7 8 9 10 11 +24V_SLEEP +24V GND PMOTOR * LREADY* EXT_C LK HSYNC * +5V +5V GND LD_ON* VDO +5V GND 1 2 3 4 5 1 2 3 4 5 6 POLYGON MOTOR LSU LD DIODE HOST COMPUTER USB CABLE 4PI N CONNECTOR f or U SB CN7 CN5 1 2 3 4 5 6 7 8 9 +5V +5V GND LED_ERROR LED_PAPER LED_DATA LED_TONER KEY_TONER* KEY_CANCEL* KEY_DEMO* 1 2 3 4 5 6 7 8 9 LED DISPLAY PANEL DCU 1 2 3 4 +5V DCU_DATA DCU_CLK +5V GND 1 2 3 4 CN9 PCL Main Board CN6 CN4 1 2 +5V PTL 1 2 PTL LEDARRAY SENSOR BOARD 1 2 3 4 +5V PEMPTY * FEED_SENSOR* +5V GND 1 2 3 4 COVER SW ITCH 1 2 3 +24V Not Use d +24VS 1 2 3 CN8 CN3 THERMI STOR 2 1 THERM_A THERM_B 1 2 CN11 HV PS 1 2 3 4 5 6 7 8 9 +24V_SLEEP +24V GND THV PWM THV * _EN THVRE AD M H VP WM* BI ASPW M +5V +5V GND 1 2 3 4 5 6 7 8 9 CN2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 +5V GND +5V +5V GND +5V +5V GND +5V +24V GND +24V +24V GND +24V +24V GND +24V EXIT +24VS FUSER ON +24VS MOTOR B* CLUTCH MOTOR_PB FAN DEV_FUSE MOTOR_A* NEW_DVE* MOTOR_PA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 SMPS CN5 FUSER CN502 SOL ENOID CN1 ENGINE S TEPPING TOR MO CN2 CN3 DEV_FUSE FAN CN4 ENG NE + SM I PS Unification B' d 2-2 Repair Manual Samsung Electronics 3 SCHEMATIC DIAGRAMS 3. [. . . ]