Konica Minolta BIZHUB 25E Field Engineering Manual page 233

4.5.8 Black lines
Scanner section
Section Step Check item
Scanner section 1
2
3
Printer section
Section Step Check item
LED print head 1
Paper path 2
Drum cartridge 3
4
5
Fuser unit 6
Circuit boards 7
8
Are the CIS (lens and lamp) and
document glass dirty?
Do the connection from CIS to main
control board remain intact?
Is the trouble settled with above
steps?
Is the lens dirty?
Is paper path dirty with toner?
Is the multi-stylus electrode dirty?
Are the grid bias, charge bias and
drum ground contact terminal dirty or
deformed?
Is the OPC drum dirty or damaged?
Are the fusing rollers or separation
scraper dirty or damaged?
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.)
Is the trouble settled with above
steps?
Result Remedy
Yes Clean
No Reconnect / Replace harness.
No 1. Adjust the background level.
2. Replace CIS.
3. Replace main control board.
Result Remedy
Yes Clean
YES Clean
Yes Clean
Yes Clean / Repair
Yes Replace OPC drum
Yes Clean / Replace
No Reconnect / Replace harness
No 1. Replace drum cartridge.
2. Replace fuser unit.
3. Replace LED print head.
4. Replace main control board.
5. Replace high-voltage power
board.
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