- Hewlett-Packard Printers Service Manual

Troubleshooting the Printing System 7-65
Table 7-18. Dropouts
Possible Cause Action
Paper might be too
smooth.
Check the paper (or other print media) type and
quality.
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.
Wrong Fuser setting
for paper type.
From the Paper Handling Menu on the Control
Panel, change the Fuser Mode setting or choose
another paper type from the printer driver.
See also “Blank Spots” on page 7-60.
Table 7-19. 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 6-44.
2. Replace the Engine Controller Board.
Engine Controller
Board.
Replace the Engine Controller Board.