Konica Minolta bizhub 20 Service Manual page 136

■ Ghost
Step Cause
HVPS PCB
1 failure
Main PCB failure Is the problem solved
2
■ Fogging
Step Cause
Toner sensor
failure (Machine
body)
1
HVPS PCB
2 failure
Main PCB failure Is the problem solved
3
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, conditions such as high or low
humidity may cause this situation to occur.
- Check that the appropriate media type or size is selected in the
printer driver.
- Replace the drum unit with a new one.
Check
Is the problem solved
after replacing the
HVPS PCB ASSY?
after replacing the main
PCB ASSY?
<User Check>
- Replace the toner cartridge with a new one.
- Replace the drum unit with a new one.
- Do not use acid paper.
- Check if there is dust or paper powder in the machine.
Check
Is the toner sensor
performed normally by
following the procedure
in
"4.10 Sensor
Operational Check
(Function code 32)" in
Chapter 6.
Is the problem solved
after replacing the
HVPS PCB ASSY?
after replacing the main
PCB ASSY?
3-61
Result Remedy
Replace the HVPS PCB
Yes ASSY.
Replace the main PCB
Yes ASSY.
Result Remedy
Replace the toner sensor
PCB unit ASSY and the
toner LED PCB ASSY.
No
Replace the HVPS PCB
Yes ASSY.
Replace the main PCB
Yes ASSY.
Confidential