4-24
4.5.5 Dark image density
Scanner section
Section
Step Check item
Result Remedy
Scanner section 1
Are the ADF glass and document
glass dirty?
Yes
Clean
2
Are the CIS (lens and lamp) and
document glass dirty?
Yes
Clean
3
Is the CIS installed properly?
No
Install it properly
4
Do the connection from CIS to main
control board remain intact?
No
Reconnect / Replace harness.
5
Is the trouble settled with above
steps?
No
1. Adjust the background level.
2. Replace CIS.
3. Replace main control board.
Printer section
Section
Step Check item
Result Remedy
Drum cartridge 1
Are the developing bias, supply bias
and blade bias contact terminal dirty
or deformed?
Yes
Clean / Repair
2
Are the grid bias, charge bias and
drum ground contact terminal dirty or
deformed?
Yes
Clean / Repair
Circuit boards
3
Are the connections from LED print
head and from high-voltage board to
main control board in good condition?
(Check plugs firmly plugged and
snapped harness.)
No
Reconnect / Replace harness
4
Is the trouble settled with above
steps?
No
1. Replace drum cartridge.
2. Replace LED print head.
3. Replace main control board.
4. Replace high-voltage power
board.
Summary of Contents for bizhub 25e
Page 1: ...bizhub 25e FIELD ENGINEERING MANUAL version 1 May 2013 DD1 91200 60 ...
Page 2: ......
Page 6: ...iv ...
Page 48: ...1 42 ...
Page 76: ...2 28 ...
Page 154: ...3 78 Second page of the report ...
Page 155: ...3 79 Third page of the report ...
Page 156: ...3 80 Fourth page of the report ...
Page 200: ...3 124 ...
Page 201: ...3 125 ...
Page 325: ...5 75 4 Install the ASSY SCRAPER 5 to the Drum unit 6 5 6 ...
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