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