C4170-90959
Image Formation Troubleshooting
117
Hint If a defect is not depicted, record the probable cause along with the conditions in the printing
environment and save a copy of the defect for future reference.
Black Lines (vertical)
Possible Cause Action
Defective Toner
Cartridge.
Inspect the Toner Cartridge for a scratched
photosensitive drum or toner leaking through worn
seals. Replace the Cartridge as necessary.
Fuser is contaminated
or damaged.
Print a cleaning page. See “To Start Engine
Cleaning” (page 62). If the problem persists, replace
the Fuser.
Broken lens in
scanner.
Replace laser scanner.
Black Page
Possible Cause Action
Poor contact between
the primary bias
contact on the Engine
Controller Assembly
and the cartridge.
Inspect the contacts. If the parts are deformed or
damaged, replace them.
Defective Toner
Cartridge.
Replace the Toner Cartridge.
Engine Controller
Assembly is defective.
If the Engine
Controller turns on the
laser beam
continuously, the
entire surface of the
Photosensitive drum
is neutralized causing
a completely black
page.
Replace the Engine Controller Assembly and the
Intermediate PCB.
Blank Page
Possible Cause Action
Software
Configuration.
Make sure the application is not sending incorrect
page length requests, or extra page eject
commands. Print a self-test/configuration page to
verify configuration.
Multiple Feeds. The
printer may be feeding
two or more pages at
once because the
paper is difficult to
separate.
Remove the paper from the paper cassette and
break the ream (do not fan the pages).
See
“Media
Troubleshooting” (page 134).
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