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Samsung SCX-4100 7.4.10 Printed Vertical Lines become curved

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Samsung Electronics

Troubleshooting

Service Manual

7.4.10 Printed Vertical Lines become curved

• Description When printing, vertical lines are not straight.

Check and Cause Solution

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.

Contents

Main SERVICE DIGITAL LASER MFP SCX-4100 Manual 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 Page 2.2 Acronyms and Abbreviations Page 2.3 Select a location for the printer Page Page Page Page 3. Specifications 3.1 General Specifications 3.3 Scan Specification 3.2 Print Specification 3.4 Copy Specification 3.5 Paper Handiling Specification 3.6 Other Specification Page Page Page Page Page 4.2.1 Paper Feed Mechanism 4.2.2 Transfer Assy 4.2.3 Drive Assy 4.2.4 Fixing Part(Fuser) 4.2.4.1 Heat Lamp power cut-off (Thermostat) 4.2.5 Scanner Unit Scan Image Controller CIS Driver Circuit Scan Motor Driver Circuit 4.2.6 LSU (Laser Scanner Unit) 4.2.7 Toner Cartridge 4.3 Main PBA 4.3.1 ASIC (Chorus2) Main function block 4.3.2 Flash Memory 4.3.3 SDRAM 4.3.4 Sensor input circuit 3) Paper Feeding, Toner Cartridge Sensing 4) Paper Exit Sensing 5) Cover Open Sensing 6) DC FAN / SOLENOID Driver 7) Motor Driver 4.4 SMPS & HVPS 4.4.1 HVPS(High Voltage Power Supply) 1) Transfer High Voltage (THV+) 2) Charge Voltage (MHV) 3)Cleaning Voltage (THV-) 4) Developing Voltage (DEV) 4.4.2 SMPS (Switching Mode Power Supply) 1) AC Input 5) Power Switch : 4) Length of Power Cord : 2) Rated Power Output 4.4.3 Fuser AC Power Control 4.5 Engine F/W 4.5.1 Feeding 4.5.1.1 Jam 0 Jam in Feed area 4.5.1.2 Jam 1 Jam inside the print engine 4.5.1.3 Jam 2 Jam in the Exit area 4.5.4 Fusing Heat Lamp Method 4.5.5 LSU Page 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 and Rear Cover Units 5.3 Side Covers 5.4.1 Remove Scanner Assy 5.4 Scanner Assy < Caution > 5.4.2 Dismantle Scanner Assy Scan Upper < Caution > Page 5.5 Middle Cover 5.6 Fuser(Heat Lamp Type) Page 5.7 Exit Roller 5.8 LSU 5.9 Fan 5.10 Drive Assy 5.11 Engine Shield Assy 5.12 Main PBA 5.13 SMPS 5.14 Transfer Roller 5.15 Feed Roller Page 5.16 Pick Up Roller & Solenoid Page 6. Alignment and Adjustments 6.1 Engine Test Mode 6.1.1 To enter the Engine Test Mode To enter the Engine Test mode 6.1.2 Diagnostic 6.2 Paper Path SCAN PART 6.3 Clearing Paper Jams 6.3.1 In the Paper Tray 6.3.2 In the Paper Exit Area 6.3.3 In the Fuser Area or Around the Toner Cartridge 6.3.4 In the Manual Feeder 6.4 Printing the System Data List 6.5 Clearing the Memory 6.6 Clearing the Drum 6.7 Consumables and Replacement Parts 6.8 The LCD Status Display by Each Error 6.9 Periodic Defective Image PTL L S U Fuser Toner Cartridge OPC Drum Charge Roller Supply Roller Developing Roller Tramsfer Roller Heat Roller Pressure Roller 7. Troubleshooting 7.1 Printing Problems Causes and Solutions 7.1.1 Vertical Black Lines and Bands 7.1.2 Vertical White Line 7.1.3 Horizontal Black Bands 7.1.4 Black/White Spot 7.1.5 Light Image 7.1.6 Dark Image or a Black 7.1.7 Uneven Density 7.1.8 Background Page Page 7.1.14 Stains on Back of Page Digital Digital Pri 7.1.15 Blank Page Print out (1) 7.1.16 Blank Page Print out (2) 7.2.1 White Copy 7.2 Copy Problems 7.2.2 Black Copy 7.2.3 Abnormal noise 7.2.4 Defective Image Quality 7.3 Paper Feed problems Causes and Solutions 7.3.1 Wrong Print Position 7.3.2 JAM 0 7.3.4 JAM 2 7.3.3 JAM 1 7.3.5 Multi-Feeding 7.3.6 Paper rolled in the fuser 7.3.7 Paper rolled on the OPC Drum 7.4 Printer Faults Causes and Solutions 7.4.1 Fuser Error 7.4.2 LSU Error 7.4.3 Fuser gear melts due to overheating causing Paper Jam. 7.4.4 Paper Empty 7.4.5 Paper Empty without indication 7.4.6 Cover Open 7.4.7 No error message when the cover is open 7.4.8 Defective motor operation 7.4.9 No Power 7.4.10 Printed Vertical Lines become curved 7.5 Toner Cartridge Service 7.5.1 Precautions on Safe-keeping of Toner Cartridge 7.5..2 Service for the Life of Toner Cartridge 7.5.2.1 Redistributing Toner 7.5.3 Standard of guarantee for consumable parts. 7.5.4 Signs and Measures of Poor toner cartridge Page Page 7.6 Software Problems Causes and Solutions 7.6.1 The printer is not working (1) 7.6.2 The printer is not working (2) 7.6.3 Abnormal Printing 7.6.4 SPOOL Error Page Page 8-2 8.1 Main Assembly Main Assembly Parts List 8-4 8.2 Frame Assembly Frame Unit Assembly Parts List Frame Unit Assembly Parts List(Cont.) 8.3 Scanner Unit Assembly Scanner Unit Assembly Parts List 8-9 8.4 Fuser Unit Assembly Page Fuser Unit Assembly Parts List 8.5 Middle Cover Unit Assembly Middle Cover Unit Assembly Parts List 8.6 Drive Unit Assembly Drive Unit Assembly Parts List 8.7 Cassette Unit Assembly Cassette Unit Assembly Parts List Page 10-1 Samsung Electronics Connection Diagram Service Manual 10. Connection Diagram