User's Manual

EN
Chapter 4 Problem Solving
95
Vertical Repetitive Defects
If marks repeatedly appear on the printed side of the page at even
intervals:
l The toner cartridge may be damaged. The circumference of the
toner cartridge drum is 94 mm (3.7 in.). If a repetitive mark occurs
every 94 mm (3.7 in.) on the page, install a new HP toner
cartridge.
l Internal parts may have toner on them. If the defects occur on the
back of the page, the problem will likely correct itself after a few
more pages.
l The fusing assembly may be damaged. Contact an HP-approved
service technician.
Misformed Characters
l If characters are improperly formed, producing hollow images, the
paper stock may be too slick. Try a different paper. See “Media
Specifications” on page 139.
l If characters are improperly formed, producing a wavy effect, the
laser scanner may need service. Verify that it also occurs on a
demo page by pressing G
O
when the printer is ready. If you need
service, contact an HP-authorized dealer or service
representative. See “Hewlett-Packard Limited Warranty
Statement” on page 121.
Page Skew
l Check the paper type and quality. See “Media Specifications” on
page 139.
l Make sure the paper or other media is loaded correctly and that
the guides are not too tight or too loose against the paper stack.
Curl or Wave
l Check the paper type and quality. Both high temperature and
humidity will cause paper curl. See “Media Specifications” on
page 139.
l Turn over the stack of paper in the tray. Also try rotating the paper
180° in the input tray.
l Open the rear door and try printing to the rear output bin.