5) Defective laser/scanner unit
Action:
Replace the laser/scanner unit.
6) Defective engine controller PCB
Action:
Replace the engine controller PCB.
II-2.
Dark
<Possible causes>
1) The image density is not adjusted correctly.
Action:
Adjust the image density by operating the external device.
2) Poor contact in the drum grounding contact on the engine controller PCB and cartridge con-
tact.
Action:
Clean the contacts if dirty. If the problem still remains after cleaning, or parts are
deformed or damaged, replace them.
3) Poor contact in the primary high voltage contact on the engine controller PCB and cartridge
contact.
Action:
Clean the contacts if dirty. If the problem still remains after cleaning, or parts are
deformed or damaged, replace them.
4) Defective laser/scanner unit
Action:
Replace the laser/scanner unit.
5) Defective engine controller PCB
Action:
Replace the engine controller PCB.
II-3.
Completely blank
<Possible causes>
1) Damaged laser shutter open/close projection of the cartridge cover
Action:
Replace the cartridge cover.
2) Poor contact in the developing bias contact on the engine controller PCB and cartridge con-
tact.
Action:
Clean the contacts if dirty. If the problem still remains after cleaning, or parts are
deformed or damaged, replace them.
3) Defective engine controller PCB
Action:
Replace the engine controller PCB.
II-4.
All black
<Possible causes>
1) Poor contact in the primary high voltage contact on the engine controller PCB and cartridge
contact.
Action:
Clean the contacts if dirty. If the problem still remains after cleaning, or parts are
deformed or damaged, replace them.
CHAPTER 4
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