Samsung ML-7000 Series Service Manual

Also see for ML 7000: Product guide Quick setup guide User guide

5. Troubleshooting5-1 Print QualityError status Check Solution1. Check HVPS output voltage 1. Refer to HVPS output specDark Image 2. Check terminal contact for - Replace the engine boardHVPS. - Refer to “4 - 11”2. Fix the terminal to contact well.1. Check the toner quantity. 1. Replace image cartridge.Light Image 2. Check HVPS output voltage 2. Refor to HVPS output spec.3. Check the terminal contact for -Replace the engine board.HVPS. 3. Fix the terminal to contact well.1. Compare new image cartridge 1. Replace image cartridgeHorizontal Density with present oneBand. 2. Contamination of Transfer 2. Replace transfer rollerRoller1. Contamination of Fuser Unit 1. Clean Fuser Unit or changeIf not improved, replace it.2. Contamination of Heat roller 2. Clean Heat RollerPrint Contamination - Refer to “4-5”3. Contamination of OPC Drum 3. Clean OPC Drum.If not improved, replace imagecartridge.1. Contamination of Fuser Unit 1. Clean Fuser Unit.If not improved, replace it.Toner on Backside - Refer to “4-5”of printer page 2. Contamination of transfer Roller 2. Replace Transfer Roller3. Contamination fo paper path 3. Remove the contamination onpaper path.1. Check HVPS output voltage 1. Refer to HVPS output spec2. OPC Drum contamination or - Replace the engine boardimage cartridge life 2. Replace the image cartridge3. Check the contamination of 3. Clean the lens with a softBack Ground PTL lens dry cloth4. Check the terminal contact for 4. Fix the terminal to contact well.HVPS.5. Check the contamination fo transfer 5. Relpace Transfer Rollerroller.Vertical Black Streak 1. OPC Drum scar 1. Clean OPC Drumand band 2. OPC Drum damage 2. Replace image cartridgeVertical White Streak 1. Contamination of LSU window 1. Clean LSU window2. If not improved,replace image cartridge1. OPC Drum scar or particle 1. Clean OPC Drum & roller2. Heat roller scar or particle 2. Cleaning heat roller3. Develope roller scar or particle 3. Clean the develope roller.Partial Black Image If not improved,(periodic) replace image cartridge.4. Charge roller scar or particle 4. Clean the charge roller.If not improved,replace image cartridge.Partial White Image 1. OPC Drum scar or particle 1. Clean OPC Drum(not periodic) 2. Check the cartridge life 2. Replace image cartridgeTroubleshootingSamsung Electronics 5-1