Samsung SCX-4200 manual No error message when the cover is open

Page 98

Troubleshooting

6.4.7 No error message when the cover is open

• Description	The Cover Open message does not appears on the LCD even when the print cover is open.

	Check and Cause		Solution

1. The ‘Open Cover’ microswitch may be stuck or faulty		1.	Use TECH mode(“cover sensor test”) to check
			cover switch operation. Check and replace switch if
			necessary.
2. Check the connector and cables between Switch and
main PBA.		2.	Replace the Main Control board or Cover Open
			S/W as necessary.

Samsung Electronics

Service Manual 6-17

Image 98

Contents Key Features Digital Laser MFPVersion no Contents Disassembly and Reassembly TroubleshootingConnection Diagram Block diagramExploded Views & Parts List Schematic DiagramPrecautions Safety WarningElectric Shock and Fire Safety Precautions Toxic materialHandling Precautions Assembly / Disassembly PrecautionsEnsure the printer is installed safely Be careful with the high temperature partWhen you move the printer Disregarding this warning may cause bodily injuryESD Precautions Super Capacitor or Lithium Battery PrecautionsProduct Specification Product OverviewSpecifications General SpecificationsPrint Specification Scan SpecificationCopy Specification CopyPaper Handiling Specification Other Specification Accessory ItemsSystem Outline Front ViewSensor Control Panel System Layout Scan PartDrive Ass’y Paper Feed MechanismTransfer Ass’y Fixing PartFuserPressure roller Safety Relevant FactsScanner Unit Scan Image ControllerLSU Laser Scanner Unit Toner Cartridge H/W Structure and Descriptions CPU PartIptop Ope Pannel ConfigurationScan Part Micom controllerPrinter Section AsicChorus 2 Block Diagram CPU UnitCopier Part Smps & HvpsHvps High Voltage Power Supply Smps Switching Mode Power Supply RemarkCH1+5V CH2+24V CH3+24VS System PrintingFuser AC Power Control S/W Structure and Descriptions ArchitectureEngine Print Processing Control Module Power on Initial Module2 S/W Overview Print Interface ModulePaper Type Engine Unit Control ModulePaper Size Accumulated Printing Pages Print ModeFunctional Requirements of Fixing Unit Fuser Handling Elapsed Printing Time3.8Environmental Index 3.6Temperature in the Stand-By modeTemperature in the Warm-Up mode Sequence of LSU module Functional Requirements for LSU ControlLSU Ready Check Transfer Roller Air Temperature Sensor Environment RecognitionFunctional Requirements of Environment Recognition 6.1 MHV Functional Requirements of Power Save ModeFunctional Requirements of Hvps Control 6.2 THVFunctional Requirements of Fan Operation Functional Requirements of Toner CartridgeFunctional Requirements of OPC Drum Door OpenPaper Jam Checking Paper jamOut Bin Tray Full Paper Jam1Low Heat Error TemperatureOpen Heat Error Over Heat ErrorLSU Error Diagnostic Engine Test ModeTo enter the Engine Test Mode To enter the Engine Test modePaper Path Clearing Paper Jams Paper TrayPaper Exit Area Fuser Area or Around the Toner Cartridge Manual FeederClearing the Drum Printing the System Data ListClearing the Memory Consumables and Replacement Parts LCD Status Display by Each ErrorPeriodic Defective Image Roller Defective image Typical defectError Message Display Meaning Suggested solutionsDirect KEY ڌډڞڪګڴٻڟڤڭڠڞگٻڦڠڴ Whenever servicing the machine, you must perform as follows General Precautions on DisassemblyReleasing Plastic Latches 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 AssyEngine Shield Assy Main PBASmps Crum PCB Transfer Roller Feed Roller Remove the Feed Gear1 Assy, as shown below Pick Up Roller & Solenoid Disassembly and Reassembly Vertical Black Lines and Bands Printing Problems Causes and SolutionsCheck and Cause Solution Vertical White LineDescription Digital Printer Horizontal Black BandsBlack/White Spot Light Image Dark Image or a BlackUneven Density BackgroundGhost Stains on the Face Digital Printer GhostStains on Back Blank Page Print outBlack Copy Copy ProblemsWhite Copy Abnormal noise Defective Image Quality2 JAM Paper Feed problems Causes and SolutionsWrong Print Position 3 JAM 4 JAMMulti-Feeding Paper rolled in the fuserPaper rolled on the OPC Drum LSU Error Printer Faults Causes and SolutionsFuser Error Fuser gear melts due to overheating causing Paper Jam Paper EmptyPaper Empty without indication Cover OpenNo error message when the cover is open No Power Defective motor operationPrinted Vertical Lines become curved Service for the Life of Toner Cartridge Toner Cartridge ServicePrecautions on Safe-keeping of Toner Cartridge Standard of guarantee for consumable partsSigns and Measures of Poor toner cartridge Fault Signs Cause & Check Solution Fault Signs Cause & Check Solution Ghost & Image Abnormal Printing Software Problems Causes and SolutionsPrinter is not working Spool Error How to delete the data in the spool manager7Block Diagram 7.1 System Block Diagram OPEExploded 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 ConnectionSchematic Diagrams 10.1 Main Board1/7Main 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 Driver Tool for TroubleshootingVacuum Cleaner Spring Hook TweezersAcronyms and Abbreviations IPC Select a location for the printer 11.4 A4 ISO 19752 Standard Pattern

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