2-84 Service Manual
4500
Paper “trees,” wrinkles, stacks poorly or curls
Paper skews or jams at registration roll
FRU Action
Fuser backup roll This problem is most likely due to a
worn backup roll. A worn backup roll
causes the printer to run hotter than
required for the media being printed.
Excessive heat can cause paper
treeing problems, poor stacking, or
curl.
FRU Action
Registration roll assembly
Lower registration roll
Registration roll bushings
The registration roll contains a
spring–loaded paper “stop” that
deflects and aligns the paper as it is
fed.
• Verify that the “stop” pivots freely
and the springs fully return it after
the paper passes.
• Verify the rolls are in good
condition and clean.
• Replace unit(s) as necessary.
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