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Konica Minolta Bizhub 20p Service Manual: Faulty Registration

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<Location of the leser beam window>

■ Faulty registration

Step
Cause
Registration rear
1
actuator catching
on some position
Drum unit failure
2
■ Dark
Step
Cause
Drum unit
1
electrode dirty
Drum unit failure
2
Developing bias
malfunciton
3
HVPS PCB
4
failure
Main PCB failure Is the problem solved
5
Fig. 3-6
<User Check>
- Check that the appropriate media type is selected in the
printer driver.
Check
Does the registration
rear actuator move
smoothly?
Is the rotation torque of
the drum unit heavy?
<User Check>
- Check the machine's environment. High temperature and high
humidity conditions can cause this problem.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Check
Is the electrode of the
drum unit dirty?
Is the problem solved
after replacing the drum
unit?
Is the problem solved
after reseting the
developer roller
counter?
Is the problem solved
after replacing the
HVPS PCB ASSY?
after replacing the main
PCB ASSY?
3-34
Result
Remedy
Re-assemble the
No
registration rear actuator.
Replace the drum unit.
Yes
Result
Remedy
Yes
Clean the electrode.
Replace the drum unit.
Yes
Reset the developer roller
counter.
Yes
Replace the HVPS PCB
Yes
ASSY.
Replace the main PCB
Yes
ASSY.
Confidential

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Troubleshooting

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