HP 2100 TN - Manual (Page 107)

EN Chapter 4 Problem Solving 95
Vertical Repetitive Defects
If marks repeatedly appear on the printed side of the page at even
intervals:
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.
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.
The fusing assembly may be damaged. Contact an HP-approved
service technician.
Misformed Characters
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.
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
Check the paper type and quality. See “Media Specifications” on
page 139.
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
Check the paper type and quality. Both high temperature and
humidity will cause paper curl. See “Media Specifications” on
page 139.
Turn over the stack of paper in the tray. Also try rotating the paper
180° in the input tray.
Open the rear door and try printing to the rear output bin.