Samsung MSYS 5150 Service Manual

Also see for MSYS 5200: User guide

Samsung Electronics 7-7Maintenance & TroubleshootingError Status Check SolutionStains on back ofpaperPoor FusingPartial blank image(not periodic)Partial blank image(periodic)Different image density(left and right)Horizonral band1. Clean the transfer roller with vaccumcleaner2. Clean the area of paper path with clothor air cleaner.3. Remove fuser and replace it1. Should use recommended paper2. Check engine controller board.If you have not thermometer, measurethe thermistor voltage to CPU, If2.98V±5% in printing CPU works well.Then, disassemble fuser and check thethermistor contact and thermistor.3. Re-check after putting the machine in thewarm place for certain period.1. Replace Toner cartridge2. Checkand adjust1~2. Replace toner cartridge3. Replace transfer roller1~2. Change toner cartridge3. Check left and right spring of transferroller and the spring pressing thedeveloper inside the machine1. Clean each contact and check goodcontact2. Clean charge roller3. Replace fuser unit4. Check engine controller1. Contamination of transfer roller2. Stains of paper path3. Pressure roller’s contamination1. Use recommended paper?2. Check fusing temperature3. The machine was under the lowtemperature for a long time?1. Toner is low?2. The toner cartridge is out ofposition?1. Develope roller scar or particle2. Scar or particle (94 mm)3. Transfer roller scar or particle(47 mm)1. Charge roller’s pressure forceunbalance2. Dev. roller and OPC or Dev. rollerand blade’s pressure forceunbalance3. Transfer roller’s pressure forceunbalance of each side1. Unstable high voltage contact2. Charge roller’s contamination3. Contamination of heat roller4. Malfunction of LSU