Samsung SCX-4200 5.12 LSU

Disassembly and Reassembly

Service Manual

5-15

Samsung Electronics

5.12 LSU

1. Before you remove the LSU, you should remove:

- Scanner Unit (Refer to 5.7)

- Middle Cover Unit (Refer to 5.9)

2. Remove the one screw securing the CAPLSU and

remove it.

3. Unplug the two connectors from the LSU.

4. Unplug the four screws and take the LSU out.

CAP LSU

LSU

Contents

Main Manual SERVICE SCX-4200 Series DIGITAL LASER MFP SCX-4200 Series ELECTRONICS Contents Continued 5. Disassembly and Reassembly 6. Troubleshooting Page 1. Precautions 1.1 Safety Warning 1.2 Caution for safety 1.2.1 Toxic material 1.2.2 Electric Shock and Fire Safety Precautions 1.2.3 Handling Precautions 1.2.4 Assembly / Disassembly Precautions 1.2.5 Disregarding this warning may cause bodily injury 1.3 ESD Precautions 1.4 Super Capacitor or Lithium Battery Precautions 2. Product Specification 2.1 Product Overview 2.2 Specifications 2.2.1 General Specifications 2.2.3 Scan Specification 2.2.2 Print Specification 2.2.4 Copy Specification 2.2.5 Paper Handiling Specification 2.2.6 Other Specification Accessory Items Page Page Page 3.1.4 System Layout 3.1.4.1 Paper Feed Mechanism 3.1.4.2 Transfer Assy 3.1.4.3 Drive Assy 3.1.4.4 Fixing Part(Fuser) 3.1.4.5 Scanner Unit 3.1.4.6 LSU (Laser Scanner Unit) 3.1.4.7 Toner Cartridge 3.2 H/W Structure and Descriptions 3.2.1 CPU Part IP_TOP 3.2.2 Scan Part 3.2.3 Ope Pannel 3.2.4 Printer Section 3.2.4.1 ASIC System Overview Chorus 2 Block Diagram General Purpose I/O 3-13 CPU Unit 3.2.5 Copier Part 3.2.6 SMPS & HVPS 3.2.6.1 HVPS (High Voltage Power Supply) 3.2.6.2 SMPS (Switching Mode Power Supply) Page 3.2.7 FUSER AC POWER CONTROL 3.3 S/W Structure and Descriptions 3.3.1 Architecture Sensors signals The following diagram shows the Engine Control System. Fig 1. The architecture of the engine firmware 3.3.2 S/W Overview 3.3.2.1 Power on Initial Module 3.3.2.2 Engine Print Processing Control Module 3.3.2.3 Print Interface Module 3.3.2.4Engine Unit Control Module 3.3.2.5Paper Size 3.3.2.6Paper Type 3.3.3 Functional Requirements of Fixing Unit (Fuser) Handling 3.3.3.1 Print Mode 3.3.3.2 Paper Type 3.3.3.3 Paper Size 3.3.3.4 Accumulated Printing Pages Page 3.3.4 Functional Requirements for LSU Control 3.3.4.1 LSU Ready Check 3.3.4.2 Sequence of LSU module 3.3.5 Functional Requirements of Environment Recognition 3.3.5.1 Transfer Roller 3.3.5.2 Air Temperature Sensor 3.3.5.3 Environment Recognition 3.3.6 Functional Requirements of HVPS Control 3.3.6.1 MHV 3.3.6.2 THV 3.3.7 Functional Requirements of Power Save Mode 3.3.8 Functional Requirements of Toner Cartridge 3.3.8.1 Installation Toner Cartridge 3.3.8.2 Toner Save 3.3.9 Functional Requirements of OPC Drum 3.3.9.1 Clean OPC Drum 3.3.13 Checking Paper jam 3.3.13.1 Paper Jam 0 3.3.13.2 Paper Jam1 3.3.13.3 Paper Jam2 3.3.14 Out Bin Tray Full 3.3.15 Temperature 3.3.15.1 Open Heat Error 3.3.15.2 Low Heat Error 3.3.15.3 Over Heat Error 3.3.16 LSU Error 4. Alignment and Adjustments 4.1 Engine Test Mode 4.1.1 To enter the Engine Test Mode To enter the Engine Test mode 4.1.2 Diagnostic 4.2 Paper Path 4.3 Clearing Paper Jams 4.3.1 In the Paper Tray 4.3.2 In the Paper Exit Area 4.3.3 In the Fuser Area or Around the Toner Cartridge 4.3.4 In the Manual Feeder 4.4 Printing the System Data List 4.5 Clearing the Memory 4.6 Clearing the Drum 4.7 Consumables and Replacement Parts 4.8 The LCD Status Display by Each Error 4.9 Periodic Defective Image 4.10 Error Message 2nd level 3rd level 4th level Default Value Descriptions Upper Level -- Upper Level Left/Ri g ht && Enter --16 Character Left/Ri g DIRECT KEY 1st level Data Setup Samsung Electronics Service Manual 4-10 5. Disassembly and Reassembly 5.1 General Precautions on Disassembly Whenever servicing the machine, you must perform as follows: Releasing Plastic Latches 5.2 Front Cover 5.3 Rear Cove 5.4 DC Fan 5.5 Right Side Cover 5.6 Left Side Cover 5.7 Scanner Unit Page Page 5.8 OPE Unit 5.9 Middle Cover Unit 5.10 Fuser Page 5.11 Exit Roller 5.12 LSU 5.14 Drive Ass'y 5.13 Fan 5.15 Engine Shield Ass'y 5.16 Main PBA 5.17 SMPS 5.18 CRUM PCB 5.19 Transfer Roller 5.20 Feed Roller Page 5.21 Pick Up Roller & Solenoid Page 6. Troubleshooting 6.1 Printing Problems Causes and Solutions 6.1.1 Vertical Black Lines and Bands 6.1.2 Vertical White Line 6.1.3 Horizontal Black Bands 6.1.4 Black/White Spot 6.1.5 Light Image 6.1.6 Dark Image or a Black 6.1.7 Uneven Density 6.1.8 Background Page Page 6.1.14 Stains on Back of Page Digital Digital Pri 6.1.15 Blank Page Print out (1) 6.1.16 Blank Page Print out (2) 6.2.1 White Copy 6.2 Copy Problems 6.2.2 Black Copy 6.2.3 Abnormal noise 6.2.4 Defective Image Quality 6.3 Paper Feed problems Causes and Solutions 6.3.1 Wrong Print Position 6.3.2 JAM 0 6.3.4 JAM 2 6.3.3 JAM 1 6.3.5 Multi-Feeding 6.3.6 Paper rolled in the fuser 6.3.7 Paper rolled on the OPC Drum 6.4 Printer Faults Causes and Solutions 6.4.1 Fuser Error 6.4.2 LSU Error 6.4.3 Fuser gear melts due to overheating causing Paper Jam. 6.4.4 Paper Empty 6.4.5 Paper Empty without indication 6.4.6 Cover Open 6.4.7 No error message when the cover is open 6.4.8 Defective motor operation 6.4.9 No Power Page 6.5 Toner Cartridge Service 6.5.1 Precautions on Safe-keeping of Toner Cartridge 6.5..2 Service for the Life of Toner Cartridge 6.5.2.1 Redistributing Toner 6.5.3 Standard of guarantee for consumable parts. 6.5.4 Signs and Measures of Poor toner cartridge Page Page 6.6.2 Abnormal Printing 6.6 Software Problems Causes and Solutions 6.6.1 The printer is not working (1) 6.6.3 SPOOL Error Block Diagram 7-1 7. Block Diagram 7.1 System Block Diagram OPE HVPS SMPS 8. Exploded Views and Parts List (SCX-4200/XAX) Contents 8-2 8.1 Main Exploded View 8-3 8.2. Housing Base Exploded View 8-4 8.3. Frame Assembly Exploded View Transfer Roller 8-5 8.4. Fuser Unit Exploded View 8.5. Drive Assembly Exploded View 8-7 8.6. Scan Assembly Exploded View 8.7. OPE Assembly Exploded View 8.8. Cassette Assembly Exploded View Service Parts List(Model: SCX-4200/XAX) Page Page Page Page Page Page Connection Diagram 9-1 9. Connection Diagram 9.1 SCX-4200 Connection Diagram FAN 2 CDRH S/ W SMPS/H VPS 10. Schematic Diagrams 10.1 Main Board(1/7) Page Schematic Diagram Service Manual 10-3 Samsung Electronics This Document can not be used without Samsungs authorization. Main Board(3/7) Page This Document can not be used without Samsungs authorization. Main Board(5/7) Page Page 10.2 OPE Circuit Diagram Page SMPS-110V(2/4) Page Page Page SMPS-220V(2/4) Page Page Page 11.2 Acronyms and Abbreviations Page 11.3 Select a location for the printer