Service manual

Image Defect Troubleshooting (Defect of the Print)
M085/M086 6-46 SM
6.5.3 TROUBLESHOOTING IMAGE DEFECT
Image defect related problems are end user recoverable if following the “User Check” items. If
the same problem occurs, follow each procedure in the order of the number described in the
"Possible cause and Remedy".
1 Light
User Check
1. Check the machine's environment. Low temperature and low humidity conditions can
cause this problem.
2. If the whole page is light, toner save mode may be on.
3. Replace the toner cartridge or drum unit with a new one.
Possible cause and Remedy
1. Dirt on exposure drum electrode
 Are the electrodes of the drum unit and machine body dirty?
Yes: Clean both electrodes. (
p.6-21 "Electrodes location on the drum unit" and
p.6-21 "Electrodes location on the machine")
2. Dirt on scanner windows of the laser unit
 Is the scanner windows of the laser unit dirty?
Yes: Wipe the dirt off with a soft, clean, lint free cloth. (Refer to figure below.)
3. Toner sensor failure
 After replacing the toner cartridge with a new one, does the same problem occur even
after printing several pages?
Yes: Replace the toner cartridge.
4. Toner sensor failure
 Does the machine start printing even after removing the toner cartridge from the drum
unit?
Yes: Clean the toner sensor. (receiving light side)
Check the harness connection of the toner LED PCB ASSY. (luminescence side)
Replace the toner sensor PCB ASSY or toner LED PCB ASSY.