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4. Image Quality Troubleshooting
• If an image quality problem occurs, replace the toner cartridge and drum cartridge with
new ones, and then determine whether the cause of the problem is due to one of the car-
tridges or another part of the main unit.
Symptom Cause Remedy
Blank print
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Faulty PC drum
Replace the drum cartridge.
Improper laser exposure
Replace the print head unit.
Replace the master board
(PWB-A).
Replace the controller control
board.
Poor developing bias
Replace the master board
(PWB-A).
Replace the controller control
board.
Black print
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Improper laser exposure
Replace the print head.
Replace the controller control
board.
Improper charging
Replace the master board
(PWB-A).
Replace the controller
control board
White spots
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Damp paper
Change the paper.
Poor image transfer
Replace the Second image
transfer roller.
Replace the master board
(PWB-A).
Replace the transport image
transfer belt unit.
Replace the controller control
board.