C4170-90959
Image Formation Troubleshooting
125
Horizontal Black Lines
Possible Cause Action
Toner Cartridge not
seated properly.
Remove the Cartridge and reinsert it.
Repetitive defect. If
the lines are repeated
at a consistent interval
down the page, this is
a repetitive defect.
Refer to “Repetitive Defect Ruler” (page 132) to
isolate and fix the problem.
Fuser entrance guide
is dirty.
Clean the guide.
Fuser Film Unit is
scarred.
Replace the Fuser FIlm Unit after determining and
removing the cause of the scarring.
Toner Cartridge is
scarred.
Replace the Cartridge.
Horizontal Dots
Possible Cause Action
Deformed or
deteriorated Transfer
Roller.
Replace the Transfer Roller.
Dirty static eliminator
teeth.
Clean the static eliminator.
Poor contact between
the Static Eliminator
and the Engine
Controller Assembly.
Inspect the contacts. If parts are damaged or
deformed, replace them.
Poor contact between
the transfer roller
contact on the Engine
Controller Assembly
and the transfer
charging roller shaft
contact.
Inspect the contacts. If parts are damaged or
deformed, replace them.
Defective Engine
Controller Assembly.
Replace the Engine Controller Assembly and the
Intermediate PCB.
Horizontal White Lines
Possible Cause Action
Toner Cartridge is
nearly empty. This can
cause uneven toner
distribution.
Remove the Toner Cartridge and shake it gently. The
cartridge will soon require replacement.
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