2-60
Confidential
 Downward fogging of solid color
 Horizontal lines
<User Check>
• Replace the toner cartridge with a new one.
Step Cause Remedy
1
High-voltage power supply 
PCB failure
Replace the high-voltage power supply PCB 
ASSY.
2 Main PCB failure Replace the main PCB ASSY.
<User Check>
• This problem may disappear after printing multiple 
sheets of paper.
• Refer to <How to clean the drum unit> to remove the 
dirt from the exposure drum using a cotton applicator.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Step Cause Remedy
1
Dirty charge electrodes Clean the electrodes of the drum unit and 
those of the machine. (Refer to Fig. 2-7 (P2-
31) and Fig. 2-6 (P2-31).)
2 Dirt on the exposure drum Perform drum cleaning.
3
Scratch or dirt on the fuser 
unit
Replace the fuser unit.
4
High-voltage power supply 
PCB failure
Replace the high-voltage power supply PCB 
ASSY.