128 Chapter 6 Troubleshooting C4170-90959
Fuser is dirty or
defective. If the defect
repeats 75 mm (2.95
inches) on the front of
the page, the defect is
associated with the
Fusing Film unit. If the
defect repeats at 63
mm (2.48 inches) on
the back of the page,
the defect is
associated with the
Pressure Roller. See
also “Repetitive
Defect Ruler”
(page 132).
Print a cleaning page. See “To Start Engine
Cleaning” (page 62). If the problem persists, replace
the Fuser.
Gears are worn,
causing slippage or
jumping.
Inspect the gears driving the Toner Cartridge and the
Fuser. Replace the Main Drive Assembly if
necessary.
Skew
Possible Cause Action
Paper does not meet
printer specifications
or is stored
improperly.
1) Print a few more pages to see if the problem
corrects itself.
2) Turn over the stack of paper in the tray. Also try
rotating the paper 180 degrees.
3) Check the paper (or other print media) type and
quality. Replace the paper, and advise the customer
to use the recommended paper and store it properly.
See “Media Troubleshooting” (page 134).
Paper is not loaded
correctly or trays are
not adjusted properly.
Make sure paper is loaded correctly and that the
front and back paper tray guides fit properly against
the paper stack.
Registration Assembly
is defective.
Inspect the Registration Assembly and replace if
necessary.
Repetitive Defects (continued)
Possible Cause Action
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