Service manual

Problem Example Cause Solution
Marks repeatedly appear
at even intervals on the
page.
The product is not set to print on
the type of media on which you
want to print.
In the printer driver, make sure
that the appropriate media type is
selected. Print speed might be
slower if you are using heavy
paper.
Internal parts might have toner on
them.
The problem typically corrects
itself after a few more pages.
The paper path might need
cleaning.
Clean the paper path. See Clean
the paper path on page 29.
The print cartridge might be
damaged.
If a repetitive mark occurs at the
same spot on the page, install a
new HP print cartridge. See
Print
cartridge on page 25.
The printed page contains
misformed characters.
The media might not meet
HP specifications.
Use a different paper, such as
high-quality paper that is intended
for laser printers.
If characters are incorrectly
formed so that they produce a
wavy effect, the laser scanner
might need service.
Verify that the problem also
occurs on the configuration page.
If so, contact HP. See
www.hp.com/support/LJM1120
or the support flyer that came in
the product box.
The printed page is curled
or wavy.
The product is not set to print on
the type of media on which you
want to print.
In the printer driver, make sure
the appropriate media type is
selected.
If the problem persists, select a
media type that uses a lower fuser
temperature, such as
transparencies or light media.
The media might have been in the
input tray too long.
Turn over the stack of media in
the tray. Also, try rotating the
media 180° in the input tray.
The media might not meet
HP specifications.
Use a different paper, such as
high-quality paper that is intended
for laser printers.
Both high temperature and
humidity can cause paper curl.
Check the product environment.
Text or graphics are
skewed on the printed
page.
The media might be loaded
incorrectly or the input tray might
be too full.
Verify that the media is loaded
correctly and that the media
guides are not too tight or too
loose against the stack. See
Install input devices on page 19.
The media might not meet
HP specifications.
Use a different paper, such as
high-quality paper that is intended
for laser printers.
122 Chapter 6 Problem solve ENWW