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Troubleshooting the Printing System
7-59
Table 7-18. Faded Print/Bubbles
Possible Cause Action
No drum ground path. With no ground path the drum cannot discharge. The
negative charge on the drum repels toner, and
leaves a white page with bubble print.
1. Check the drum ground spring and connect it as
shown on page 6-43.
2. Replace the Engine Controller Board.
Engine Controller
Board.
Replace the Engine Controller Board.
Table 7-19. Gray Background
Possible Cause Action
Paper does not meet
printer specifications
or is stored
improperly.
1. Print a few more pages to see if the problem
corrects itself.
2. Turn over the stack of paper in the tray. Also try
rotating the paper 180°.
3. Check the paper (or other print media) type and
quality. Replace the paper, and advise the customer
to use the recommended paper and store it properly.
Printer’s operating
environment does not
meet specifications.
Make sure the printer’s operating environment meets
specifications.
Wrong toner density
setting.
From the Print Quality Menu on the Control Panel,
adjust the toner density setting. Make sure
EconoMode is off.
Faulty Toner
Cartridge.
Replace the Toner Cartridge.
See also “Light Print, Dark Print, or Fade” on page
7-61.
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