Samsung ML-4550 Service Manual

Also see for ML ML-4551N: Specifications Solution guide Quick install guide User guide Declaration of conformity

Contents

6.2.3 Horizontal Black Band• Description 1. Dark or blurry horizontal stripes occur in the printing periodically.(They may not occur periodically.)Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital PrinterCheck and Cause Solution1. Bad contacts of the voltage terminals toprint cartridge.2. The rollers of print cartridge may bestained.Charge roller = 38mmDevelop roller = 45mmTransfer roller = 55mmOPC Drum = 95mm1. Clean each voltage terminal of the Charge,Supply, Develop and Transfer roller.(remove the toner particles and paper par-ticles)2. Clean the right Gear that has relativelysmall gap of the teeth in the OPC.3. If the malfunction persists, replace theprint cartridge.6.2.4 Black/White Spot• Description 1. Dark or blurry black spots occur periodically in the printing.2. White spots occur periodically in the printing.Digital PrinterDigital PrinterDigital PrinterDigital PrinterDigital PrinterCheck and Cause Solution1. If dark or blurry black spots occur periodi-cally, the rollers in the print cartridge maybe contaminated with foreign matte orpaper particles.( Charge roller : 38 mm intervalOPC drum : 95 mm interval)2. If faded areas or voids occur in a blackimage at intervals of 95 mm, or blackspots occur elsewhere, the OPC drumsurface is damaged.3. If a black image is partially broken, thetransfer voltage is abnormal or the trans-fer roller's life has expired.1. Run OPC cleaning Mode Print and run theSelf-test 2 or 3 times.2. In case of 95 mm interval unremovable in1, cleanly remove foreign substances stuckon the OPC location equivalent to blackspots and white spots with a dry duster.3. The transfer roller guarantees 150,000sheets printing in normal environment. Ifthe roller's life is expired, replace it.4. In case of 38 mm interval unremovable in1, take measures as to replace the printcartridge and try to print out.5. Clean the inside of the set against thepaper particles and foreign matter in ordernot to cause the trouble.TroubleshootingSamsung ElectronicsService Manual 6-3