Printer Faults Causes and Solutions, Fuser Error | Samsung SCX-4200

Troubleshooting

6.4 Printer Faults – Causes and Solutions

6.4.1 Fuser Error

	• Description	A message "Open Heat Error/Over heat/Heating Error' is displayed in the LCD panel.

		Check and Cause		Solution

1.	Thermostat, fuser power cable or heat lamp is		1.	Replace the whole fuser assembly if the
	open circuit.			thermostat is open circuit.
2.	Thermistor is open circuit.		2.	Replace the whole fuser assembly if the ther-
				mistor sensor is faulty.

3. Heat lamp ON/OFF test

3. Replace the fuser.

4. Drive gear melted

6.4.2 LSU Error

• Description A message “LSU Error” is displayed in the LCD panel.

	Check and Cause	Solution

1.	LSU cable or connector faulty.	Use TECH mode to test the LSU
		- Replace the LSU
2.	LSU motor is faulty.	- Replace a main board if the same error persists after
		replacing a LSU.
3.	Check the HSYNC signal.

6-14Service Manual

Samsung Electronics

Image 95

Samsung SCX-4200 manual Printer Faults Causes and Solutions, Fuser Error, LSU Error

Contents

Digital Laser MFP Key Features Version no Contents Troubleshooting Disassembly and Reassembly Schematic Diagram Block diagramExploded Views & Parts List Connection Diagram Safety Warning Precautions Toxic material Electric Shock and Fire Safety Precautions Assembly / Disassembly Precautions Handling Precautions Disregarding this warning may cause bodily injury Be careful with the high temperature partWhen you move the printer Ensure the printer is installed safely Super Capacitor or Lithium Battery Precautions ESD Precautions Product Overview Product Specification General Specifications Specifications Scan Specification Print Specification Copy Copy Specification Paper Handiling Specification Accessory Items Other Specification Front View System Outline Sensor Control Panel Scan Part System Layout Fixing PartFuser Paper Feed MechanismTransfer Ass’y Drive Ass’y Scan Image Controller Safety Relevant FactsScanner Unit Pressure roller LSU Laser Scanner Unit Toner Cartridge CPU Part H/W Structure and Descriptions Iptop Micom controller ConfigurationScan Part Ope Pannel Asic Printer Section CPU Unit Chorus 2 Block Diagram Smps & Hvps Copier Part Hvps High Voltage Power Supply Remark Smps Switching Mode Power Supply Printing CH1+5V CH2+24V CH3+24VS System Fuser AC Power Control Architecture S/W Structure and Descriptions Print Interface Module Power on Initial Module2 S/W Overview Engine Print Processing Control Module Paper Type Engine Unit Control ModulePaper Size Elapsed Printing Time Print ModeFunctional Requirements of Fixing Unit Fuser Handling Accumulated Printing Pages 3.8Environmental 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 6.2 THV Functional Requirements of Power Save ModeFunctional Requirements of Hvps Control 6.1 MHV Door Open Functional Requirements of Toner CartridgeFunctional Requirements of OPC Drum Functional Requirements of Fan Operation Paper Jam1 Checking Paper jamOut Bin Tray Full Paper Jam Over Heat Error TemperatureOpen Heat Error Low Heat Error LSU Error To enter the Engine Test mode Engine Test ModeTo enter the Engine Test Mode Diagnostic Paper Path Paper Tray Clearing Paper Jams Paper Exit Area Manual Feeder Fuser Area or Around the Toner Cartridge Clearing the Drum Printing the System Data ListClearing the Memory LCD Status Display by Each Error Consumables and Replacement Parts Roller Defective image Typical defect Periodic Defective Image Display Meaning Suggested solutions Error Message Direct 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 Drive Assy 13 Fan Main PBA Engine Shield Assy Smps Crum PCB Transfer Roller Feed Roller Remove the Feed Gear1 Assy, as shown below Pick Up Roller & Solenoid Disassembly and Reassembly Vertical White Line Printing Problems Causes and SolutionsCheck and Cause Solution Vertical Black Lines and Bands Description Digital Printer Horizontal Black BandsBlack/White Spot Dark Image or a Black Light Image Background Uneven Density Ghost Digital Printer Ghost Stains on the Face Blank Page Print out Stains on Back Black Copy Copy ProblemsWhite Copy Defective Image Quality Abnormal noise 2 JAM Paper Feed problems Causes and SolutionsWrong Print Position 4 JAM 3 JAM Paper rolled in the fuser Multi-Feeding Paper rolled on the OPC Drum LSU Error Printer Faults Causes and SolutionsFuser Error Paper Empty Fuser gear melts due to overheating causing Paper Jam Cover Open Paper Empty without indication No error message when the cover is open Defective motor operation No Power Printed Vertical Lines become curved Standard of guarantee for consumable parts Toner Cartridge ServicePrecautions on Safe-keeping of Toner Cartridge Service for the Life of Toner Cartridge Signs 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 How to delete the data in the spool manager Spool Error OPE 7Block Diagram 7.1 System Block Diagram 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 9Connection 9.1 SCX-4200 Connection Diagram 10.1 Main Board1/7 Schematic Diagrams 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 Tweezers Tool for TroubleshootingVacuum Cleaner Spring Hook Driver Acronyms and Abbreviations IPC Select a location for the printer 11.4 A4 ISO 19752 Standard Pattern