Samsung SCX-4100 specifications Uneven Density, Background

Page 69

Troubleshooting

7.1.7 Uneven Density

•Description Print density is uneven between left and right.

	Check and Cause	Solution

1.	The pressure force on the left and right	1. Replace both the left and right bush and
	springs of the transfer roller is not even,	spring assemblies.
	the springs are damaged, the transfer
	roller is improperly installed, or the trans-
	fer roller bushing or holders are damaged.
2.	The life of the Toner cartridge has	2. Replace the toner cartridge and try to print out
	expired.
3.	The toner level is not even on the toner	3. Gently shake the toner cartridge and try
	cartridge roller due to the damaged blade	printing again. If the problem persists
	or low toner.	replace the toner cartridge.

7.1.8 Background

• Description

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Light dark background appears in whole area of the printing.

	Check and Cause	Solution

1.	Printing large quantities of low coverage	1. The toner cartridge is basically designed to
	(2%) pages or the printer has not been	print 3,000 sheets with 5% image. If it
	used for a long time.	prints more than 3,600 sheets with 2%
		coverage, a background can occur.
2.	Is a recycled toner cartridge be	2. The A/S is not guaranteed if using a recy-
	used?	cled toner cartridge.
		Note try shaking the toner cartridge gently
		from side to side. If the problem persists
		replace the toner cartridge.
3.	Has the life span of the toner	3. Replace the toner cartridge when its life is
	cartridge ended?	expired.
4.	Is the movement(Up and Down) of	4. Clean the transfer roller bushes.
	the transfer roller smooth?
5. Is the HVPS normal?		5. Clean the high voltage charge terminals.
		If this does not resolve the problem replace
		the HVPS.

Service Manual

7-4

Samsung Electronics

Image 69

Contents Specifications PrecautionsTroubleshooting Block DiagramHttp//itself.sec.samsung.co.kr Safety Warning PrecautionsToxic material Electric Shock and Fire Safety PrecautionsAssembly / Disassembly Precautions Handling PrecautionsDisregarding this warning may cause bodily injury Be careful with the high temperature partESD Precautions Tool for Troubleshooting Acronyms and Abbreviations IPC Select a location for the printer 1 A4 5% Pattern Sample Pattern for the Test2 A4 2% Pattern 3 A4 IDC 5% Patten Memo General Specifications SpecificationsScan Specification Print SpecificationCopy Copy SpecificationPaper Handiling Specification Whql Other SpecificationMemo Front View Printer ComponentsRear View Control Panel System Layout Transfer Ass’y Paper Feed MechanismDrive Ass’y Fixing PartFuserScanner Unit Safety Relevant FactsScan Image Controller CIS Driver CircuitLSU Laser Scanner Unit Toner Cartridge Main PBA Flash Memory Asic Chorus2Sdram Sensor input circuitPaper Exit Sensing Paper Feeding, Toner Cartridge SensingCover Open Sensing DC FAN / Solenoid DriverSmps & Hvps HVPSHigh Voltage Power Supply Rated Power Output Smps Switching Mode Power SupplyConsumption Power Length of Power Cord 1830 ± 50mm Power Switch FittedFeature Fuser AC Power ControlEnvironment Condition Safty RequrementDrive Engine F/WTransfer FeedingFusing 5 LSUHeat Lamp Method Memo General Precautions on Disassembly Releasing Plastic LatchesWhenever servicing the machine, you must perform as follows Front and Rear Cover Units Side Covers Remove Scanner Ass’y Scanner Ass’yDismantle Scanner Ass’y Spring Pulley Idle ETC Belt Middle Cover FuserHeat Lamp Type Remove 4 screws and divide the Fuser into two parts LSU Exit RollerFan Engine Shield Ass’y Smps Transfer Roller Feed Roller Remove the Feed Roller and Feed Roller1, as shown below Pick Up Roller & Solenoid Memo To enter the Engine Test Mode Engine Test ModeDiagnostic To enter the Engine Test modePaper Path Paper Tray Clearing Paper JamsPaper Exit Area Manual Feeder Fuser Area or Around the Toner CartridgePrinting the System Data List Clearing the MemoryClearing the Drum LCD Status Display by Each Error Consumables and Replacement PartsRoller Defective image Typical defect Periodic Defective ImagePrinting Problems Causes and Solutions Vertical Black Lines and BandsVertical White Line Black/White Spot Horizontal Black BandsDark Image or a Black Light ImageBackground Uneven DensityGhost Digital Printer Ghost Stains on the FaceBlank Page Print out Stains on BackCopy Problems White CopyBlack Copy Defective Image Quality Abnormal noisePaper Feed problems Causes and Solutions Wrong Print Position2 JAM 4 JAM 3 JAMPaper rolled in the fuser Multi-FeedingPaper rolled on the OPC Drum Printer Faults Causes and Solutions Fuser ErrorLSU Error Paper Empty Fuser gear melts due to overheating causing Paper JamCover Open Paper Empty without indicationNo error message when the cover is open Defective motor operation No PowerPrinted Vertical Lines become curved Precautions on Safe-keeping of Toner Cartridge Toner Cartridge ServiceService for the Life of Toner Cartridge Standard of guarantee for consumable partsEnded Signs and Measures of Poor toner cartridgeFault Signs Cause & Check Solution Fault Signs Cause & Check Solution Ghost & Image Printer is not working Software Problems Causes and SolutionsNot working with the message insufficient printer Abnormal Printing How to delete the data in the spool manager Spool ErrorMemo Exploded Views and Parts List Main Assembly Main Assembly Parts List Frame Assembly Description SEC.Code ’ty Remark Frame Unit Assembly Parts ListFrame Unit Assembly Parts ListCont Scanner Unit Assembly Scanner Unit Assembly Parts List Fuser Unit Assembly Fuser Unit Assembly Parts List WASHER-PLAIN Middle Cover Unit Assembly ’ty Remark Middle Cover Unit Assembly Parts ListDrive Unit Assembly Parts List Drive Unit AssemblyCassette Unit Assembly Cassette Unit Assembly Parts List Block Diagram 10.10Connection Diagram

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