Konica Minolta BIZHUB 25E Field Engineering Manual page 227

4.5.2 Blank image
Scanner section
Section Step Check items
Scanner section 1
2
3
Printer section
Section Step Check items
Drum cartridge 1
2
3
Circuit boards 4
Transfer section 5
6
Is the scanner drive transmission
mechanism in good condition?
Do the connection from CIS to main
control board remain intact?
Is the trouble settled with above
steps?
Is the drum cartridge driven properly?
Are the developing bias, supply bias
and blade bias contact terminal dirty
or deformed?
Are the grid bias, charge bias and
drum ground contact terminal dirty or
deformed?
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 transfer bias contact terminal
dirty or deformed?
Is the trouble settled with above
steps?
Result Remedy
No Check and replace as neces-
sary.
No Reconnect / Replace harness.
No 1. Replace CIS.
2. Replace main control board.
Result Remedy
No Correct / Replace drive cou-
pling mechanism of drum
cartridge and machine.
Replace the drum cartridge.
Yes Clean / Repair
Yes Clean / Repair
No Reconnect / Replace harness
Yes Clean / Replace
No 1. Replace drum cartridge.
2. Replace LED print head.
3. Replace main control board.
4. Replace high-voltage power
board.
5. Replace transfer roller unit.
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