Crum PCB | Samsung SCX-4200 instruction

Disassembly and Reassembly

5.18 CRUM PCB

1.Before you remove the CRUM PCB, you should remove:

-LSU (Refer to 5.12)

-Engine Shield Ass'y (Refer to 5.15)

2.Remove the four screws securing the CRUM PCB and remove it, as shown below.

CRUM PCB

Samsung Electronics

Service Manual 5-19

Image 76

Samsung SCX-4200 manual Crum PCB

Contents

Key Features Digital Laser MFP Version no Contents Disassembly and Reassembly Troubleshooting Block diagram Exploded Views & Parts ListConnection Diagram Schematic Diagram Precautions Safety Warning Electric Shock and Fire Safety Precautions Toxic material Handling Precautions Assembly / Disassembly Precautions Be careful with the high temperature part When you move the printerEnsure the printer is installed safely Disregarding this warning may cause bodily injury ESD Precautions Super Capacitor or Lithium Battery Precautions Product Specification Product Overview Specifications General Specifications Print Specification Scan Specification Copy Specification Copy Paper Handiling Specification Other Specification Accessory Items System Outline Front View Sensor Control Panel System Layout Scan Part Paper Feed Mechanism Transfer Ass’yDrive Ass’y Fixing PartFuser Safety Relevant Facts Scanner UnitPressure roller Scan Image Controller LSU Laser Scanner Unit Toner Cartridge H/W Structure and Descriptions CPU Part Iptop Configuration Scan PartOpe Pannel Micom controller Printer Section Asic Chorus 2 Block Diagram CPU Unit Copier Part Smps & Hvps Hvps High Voltage Power Supply Smps Switching Mode Power Supply Remark CH1+5V CH2+24V CH3+24VS System Printing Fuser AC Power Control S/W Structure and Descriptions Architecture Power on Initial Module 2 S/W OverviewEngine Print Processing Control Module Print Interface Module Paper Size Engine Unit Control ModulePaper Type Print Mode Functional Requirements of Fixing Unit Fuser HandlingAccumulated Printing Pages Elapsed Printing Time Temperature in the Warm-Up mode 3.6Temperature in the Stand-By mode3.8Environmental Index LSU Ready Check Functional Requirements for LSU ControlSequence of LSU module Functional Requirements of Environment Recognition Air Temperature Sensor Environment RecognitionTransfer Roller Functional Requirements of Power Save Mode Functional Requirements of Hvps Control6.1 MHV 6.2 THV Functional Requirements of Toner Cartridge Functional Requirements of OPC DrumFunctional Requirements of Fan Operation Door Open Checking Paper jam Out Bin Tray FullPaper Jam Paper Jam1 Temperature Open Heat ErrorLow Heat Error Over Heat Error LSU Error Engine Test Mode To enter the Engine Test ModeDiagnostic To enter the Engine Test mode Paper Path Clearing Paper Jams Paper Tray Paper Exit Area Fuser Area or Around the Toner Cartridge Manual Feeder Clearing the Memory Printing the System Data ListClearing the Drum Consumables and Replacement Parts LCD Status Display by Each Error Periodic Defective Image Roller Defective image Typical defect Error Message Display Meaning Suggested solutions Direct KEY ڌډڞڪګڴٻڟڤڭڠڞگٻڦڠڴ Releasing Plastic Latches General Precautions on DisassemblyWhenever servicing the machine, you must perform as follows Front Cover Rear Cove DC Fan Right Side Cover Left Side Cover Scanner Unit Remove the two screws securing the Scan Upper Unit Scan Motor Assy OPE Unit Middle Cover Unit Fuser Unwrap the Thermistor Harness, as shown below Exit Roller 12 LSU 13 Fan Drive Assy Engine Shield Assy Main PBA Smps Crum PCB Transfer Roller Feed Roller Remove the Feed Gear1 Assy, as shown below Pick Up Roller & Solenoid Disassembly and Reassembly Printing Problems Causes and Solutions Check and Cause SolutionVertical Black Lines and Bands Vertical White Line Black/White Spot Horizontal Black BandsDescription Digital Printer Light Image Dark Image or a Black Uneven Density Background Ghost Stains on the Face Digital Printer Ghost Stains on Back Blank Page Print out White Copy Copy ProblemsBlack Copy Abnormal noise Defective Image Quality Wrong Print Position Paper Feed problems Causes and Solutions2 JAM 3 JAM 4 JAM Multi-Feeding Paper rolled in the fuser Paper rolled on the OPC Drum Fuser Error Printer Faults Causes and SolutionsLSU Error Fuser gear melts due to overheating causing Paper Jam Paper Empty Paper Empty without indication Cover Open No error message when the cover is open No Power Defective motor operation Printed Vertical Lines become curved Toner Cartridge Service Precautions on Safe-keeping of Toner CartridgeService for the Life of Toner Cartridge Standard of guarantee for consumable parts Signs and Measures of Poor toner cartridge Fault Signs Cause & Check Solution Fault Signs Cause & Check Solution Ghost & Image Printer is not working Software Problems Causes and SolutionsAbnormal Printing Spool Error How to delete the data in the spool manager 7Block Diagram 7.1 System Block Diagram OPE Exploded Views and Parts List SCX-4200/XAX Main Exploded View Housing Base Exploded View 24 22 Fuser Unit Exploded View Drive Assembly Exploded View Scan Assembly Exploded View OPE Assembly Exploded View Cassette Assembly Exploded View Service Parts ListModel SCX-4200/XAX HOUSING-M-TERMINAL R2SCX-4920N,ABSNH-1 ROLLER-M-EXIT F/UPML-1710,PCGE EXL-911 SCREW-TAPTITEPWH,+,B,M3,L10,NI PLT,SWRC LABELP-NOMBOXCOMMON,XAX,ART,100G,0 CBF HARNESS-PTLML-1710,CBF,UL 1061,2P,2 LCD-DISPLAYXEVVHX1620BHRC9,SCX-5312F Diagram 9Connection 9.1 SCX-4200 Connection Schematic Diagrams 10.1 Main Board1/7 Main Board2/7 Main Board3/7 Main Board4/7 Main Board5/7 Main Board6/7 Main Board7/7 OPE Circuit Diagram SMPS-110V1/4 SMPS-110V2/4 SMPS-110V3/4 SMPS-110V4/4 SMPS-220V1/4 SMPS-220V2/4 SMPS-220V3/4 SMPS-220V4/4 Tool for Troubleshooting Vacuum Cleaner Spring HookDriver Tweezers Acronyms and Abbreviations IPC Select a location for the printer 11.4 A4 ISO 19752 Standard Pattern