User Guide

Table 7-39 Dark print
Possible cause Recommended action(s)
The toner-density setting is incorrect. Open the print-quality menu at the
control panel and adjust the toner-
density setting. See
Print-quality
submenu.
The print cartridge drum is close to the
end of its expected life.
Replace the print cartridge.
The media does not meet
specifications or is not stored correctly.
1 Turn over the stack of media in the
tray. Also try rotating the media
180°.
2 Check the media for type and
quality. Replace the media, and
advise the customer to use the HP-
recommended media and to store
it correctly. See
Media
specifications.
The high-voltage contact to the power
supply is poor.
Clean the contacts if they are dirty. If
the problem persists after cleaning, or
if the contacts are damaged or
deformed, replace the contacts.
The laser/scanner assembly is
defective.
Replace the laser/scanner assembly.
See
Laser/scanner assembly.
The high-voltage circuit is defective. Replace the power-supply assembly.
See
Power supply.
Repetitive-defects troubleshooting
Defects on printer rollers can cause image defects to appear at regular intervals on the page,
corresponding to the circumference of the roller that is causing the defect. Measure the distance
between defects that recur on a page. Use the following table or the repetitive-defect ruler to
determine which roller is causing the defect. To resolve the problem, try cleaning the roller first. If the
roller remains dirty after cleaning or if it is damaged, replace the part that is indicated in
Table 7-40
Repetitive defects.
CAUTION Do not use solvents or oils to clean rollers. Instead, rub the roller with lint-free
paper. If dirt is difficult to remove, rub the roller with lint-free paper that has been dampened
with water.
Table 7-40 Repetitive defects
Roller Distance between defects Replacement part
Primary charging roller 37.7 mm (1.5 inches) Print cartridge
Developer roller* 62.8 mm (2.5 inches) Print cartridge
Fuser 75.0 mm (2.95 inches)
94.0 mm (3.75 inches)
Fuser
400 7 Troubleshooting