Brother DCP-7057 Service Manual page 127

■ Ghost
Step
High voltage power supply PCB
1
ASSY failure
2 Main PCB failure
■ Fogging
Step
High voltage power supply PCB
1
ASSY failure
2 Main PCB failure
CAUTION :
• This problem often occurs when the drum unit or toner cartridge is nearly at the end of
life.
User Check
• Check the machine's environment. High temperature and high
humidity or low temperature and low humidity conditions can cause
this problem.
• Choose Reduce Ghosting mode in the driver.
• Replace the toner cartridge with a new one.
Cause
User Check
• This problem may disappear after printing approximately 10 pages
of completely blank sheets.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
• Do not use acid paper.
Cause
2-90
Remedy
Replace the high voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
Remedy
Replace the high voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
Confidential