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Confidential
■ Poor fixing
■ Completely blank
User Check
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Step Cause Check
Result
Remedy
1
Fuser unit failure Is the problem solved
after replacing the fuser
unit?
Ye s
Replace the fuser unit.
2
Low-voltage
power supply
PCB failure
Is the problem solved
after replacing the PS
PCB unit?
Ye s
Replace the PS PCB unit.
3
HVPS PCB
failure
Is the problem solved
after replacing the
HVPS PCB ASSY?
Ye s
Replace the HVPS PCB
ASSY.
4
Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Ye s
Replace the main PCB
ASSY.
User Check
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Step Cause Check
Result
Remedy
1
Developing bias
voltage
conduction
failure
Are the electrodes on
the drum unit and
machine body dirty?
Ye s
Clean both electrodes.
2
Scanner harness
of the laser unit
connection
failure
Is the scanner harness
of the laser unit
connected securely?
No
Reconnect the scanner
harness of the laser unit.
3
Laser unit failure Is the problem solved
after replacing the laser
unit?
Ye s
Replace the laser unit.
4
HVPS PCB
failure
Is the problem solved
after replacing the
HVPS PCB ASSY?
Ye s
Replace the HVPS PCB
ASSY.
5
Main PCB failure Is the problem solved
after replacing the main
PCB ASSY?
Ye s
Replace the main PCB
ASSY.