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Samsung ML-1651N, ML-1650 specifications Uneven Density, Background

Models: ML-1650 ML-1651N

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Troubleshooting

4-2-7 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 Spring
	springs of the transfer roller is not even,		Holder.
	the springs are damaged, the transfer
	roller is improperly installed, or the trans-
	fer roller bushing or holder is damaged.
2.	The life of the Developer has expired.	2.	Occur in the developer cartridge, replace
			the developer and try to print out.

3.The toner level is not even on the devel- oper roller due to the bad blade.

4-2-8 Background

•Description Light dark background appears in whole area of the printing.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

	Check and Cause		Solution

1.	Recycled recording paper has been	1.	B/S is not guaranteed when using recycled
	used.		paper.
2.	The life of the Developer has expired.	2.	Replace the Developer that has expired.
3.	The up-to-down movement of the trans-	3.	Clean the busing part of the transfer roller.
	fer roller is swift?
4. The HVPS is normal?		4. Replace the Developer if not solved by the
	(Perform DCU diagnostic code 01~04)		above direction 1~3.

Samsung Electronics

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Image 33

Samsung ML-1651N, ML-1650 specifications Uneven Density, Background

Contents

Laser Printer Version no This manual is stated and provided for service description Read each caution carefully Safety PrecautionsReleasing Plastic Latches Precautions on Disassembly and ReassemblyElectronic Scale Tools for TroubleshootingController ML-1650 ML-1651N EnginePaper TonerNetwork ML-1650 ML-1651N EnvironmentGeneral Precautions on Disassembly Releasing Plastic LatchesWhenever servicing the machine, you must perform as follows Transfer Roller Controller Board Pickup Assembly Main Cover MP Multi-Purpose Tray Exit AssemblyHvps board LSUSolenoid 10 FanDrive Assembly To remove the thermistor from the fuser assembly Fuser AssemblyTo remove the thermostat from the fuser assembly To remove the halogen lamp from the fuser assemblyGuide Feed & Erase Lamp MPF Assembly and Miscellaneous on MPF Assembly To replace the nockup plateTo replace the pickup roller To replace the Paper Empty PE sensor To replace the pickup holder and the Adjust End MPEngine Board and Miscellaneous To replace the exit board To remove the transfer guide To replace the actuator feedCause and solution of Bad image How to use DCUCause and solution of the bad discharge Cause and solution of the malfunctionHow to use DCU DCU SetupCode Self Diagnostic Mode Paper Path Layout Self Test ButtonDCU Panel ML-1650 Diagnostic Control Unit Quick ReferanceCheck and Cause Solution Cause and solution of Bad imageVertical Black Line and Band Vertical White LineBlack/White Spot Horizontal Black BandDark Image or a Black Light ImageBackground Uneven DensityGhost Satins on the Face Blank Page Print out Satins on BackCause and solution of the bad discharge Wrong Print Position2 JAM 4 JAM 3 JAMPaper rolled in the fuser Multi-Feeding7 OPC Cause and solution of the malfunction All LEDs blinking Fuser ErrorAll LEDs blinking Scan Error Not function of the gear of the fuser due to melting away Paper EmptyPaper Empty without indication Cover Open No lamp on when the cover is openDefective motor operation No PowerVertical Line Getting Curved Toner Cartridge Service Signs and Measures at Poor toner cartridge Fault Signs Cause & Check Solution Light imagePartially blank ImageRecycled product Fault Signs Cause & Check Solution White Black spotFault Signs Cause & Check Solution Ghost & Image Printer is not working Cause and solutions of bad environment of the softwareUtilities program Abnormal Printing How to delete the data in the spool manager Spool ErrorExploded Views and Parts List Service Parts List Exploded Views and Parts List10-3 10-4 Cover Exploded View All Exploded Views and Parts ListFrame Exploded View Exit Exploded View Rack-MPF Exploded View Fuser Exploded View Drive Exploded View Pick-Up Exploded View Cassette Exploded View Video ControllerBlock Diagram Block DiagramSensor Engine Block DiagramVPS Connection Diagram