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C5100 Troubleshooting • 148
Faint printing
Fading in patches
Longitudinal black stripes
Possible cause Remedy
The toner cartridge is
incorrectly installed.
Reinstall the toner cartridge (see page 87).
Toner is low. Change toner cartridge (see page 87).
The paper is moist. Store paper within specified temperature and
humidity levels (see page 152).
Paper is unsuitable for
printer.
Use recommended paper (see page 11 ).
Possible cause Remedy
The paper is moist. Store paper within specified temperature and
humidity levels (see page 152).
Possible cause Remedy
Image drum is
damaged.
Replace image drum (see page 94).
Toner is low. Change toner cartridge (see page 87).
Periodic black
lateral lines or
spots.
• If the lines or spots occur at intervals of approximately
44 to 94 mm, the green surface of the image drum is
damaged or dirty. If damaged, replace the image drum
cartridge (see page 94). If dirty, wipe the image drum
gently with soft tissue. If this does not work, replace
the image drum (see page 94).
• If the lines or spots occur at intervals of approximately
113 mm, the fuser roller is damaged. Change the fuser
(see page 108).
The image drum
has been
exposed to light.
Remove the image drum from the printer and store it in a
dark place for several hours. If this does not work,
replace the image drum (see page 94).