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Konica Minolta Bizhub 20p Service Manual: Troubleshooting For Image Defect

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4.3

Troubleshooting for Image Defect

Image defect related problems are end user recoverable if following the User Check items. If
the same problem occurs, follow each procedure in the order of the number described in the
Step column in the tables below.
■ Light
Step
Dirt on exposure
1
drum electrode
Dirt on scanner
2
windows of the
laser unit
Toner sensor
failure
3
4
Between the
HVPS PCB/Main
5
PCB connection
failure
HVPS PCB
6
failure
Main PCB failure Is the problem solved
7
Laser unit failure
8
<User Check>
- Check the machine's environment. Low temperature and low
humidity conditions can cause this problem.
- If the whole page is light, toner save mode may be on.
- Replace the toner cartridge or drum unit with a new one.
Cause
Are the electrodes of the
drum unit and machine
body dirty?
Is the scanner windows
of the laser unit dirty?
After replacing the toner
cartridge with a new
one, does the same
problem occur even
after printing several
pages?
Does the machine start
printing even after
removing the toner
cartridge from the drum
unit?
Is the harness of the
HVPS PCB ASSY and
main PCB ASSY
connected correctly?
Is the problem solved
after replacing the
HVPS PCB ASSY?
after replacing the main
PCB ASSY?
Is the problem solved
after replacing the laser
unit?
Check
Result
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
3-33
Remedy
Clean both electrodes.
(Refer to
Fig. 3-2, Fig.
3-3.)
Wipe the dirt off with a soft,
clean, lint free cloth.
(Refer to
Fig.
3-6.)
Replace the toner
cartridge.
Clean the toner sensor.
(receiving light side /
emitting light side)
Check the harness
connection of the toner
LED PCB ASSY.
(luminescence side)
Replace the toner sensor
PCB ASSY or toner LED
PCB ASSY.
Reconnect the harness of
the HVPS PCB ASSY and
main PCB ASSY.
Replace the HVPS PCB
ASSY.
Replace the main PCB
ASSY.
Replace the laser unit.
Confidential

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Troubleshooting

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