The Copy Is Wobbly - Canon iR8500 Service Manual

3.3.18 The copy is wobbly

Scanner drive cable
1) While the scanner is moving, is the cable on the cable pulley wound
YES: Perform the following:
Scanner rail
2) Move the No. 1 mirror base by hand. Does it move smoothly?
NO:
Photosensitive drum
3) Does the problem occur at intervals of about 340 mm?
YES: Perform the following:
Drum drive gear
4) Does the problem occur at intervals of about 4 mm?
YES: Check the drum drive gear.
Developing gear
5) Does the problem occur at intervals of about 2 mm?
YES: Check the developing assembly.
Drum drive system
6) Does the problem occur at intervals of about 10 mm?
YES: Check the cleaner assembly.
COPYRIGHT© 2001 CANON INC.
in multiple runs? Or, is the cable too slack or too taut?
1. String the cable correctly.
2. If the cable is twisted or frayed, replace it.
Clean the surface of the scanner rail with solvent; then, apply a
small amount of silicone oil (S-20).
1. Check the drum gear.
2. Check the drum ends (in contact with the developing members)
for a scratch or protrusion.
Check the drum drive system.
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CHAPTER 6 TROUBLESHOOTING
CANON iR8500/7200 REV.1 AUG. 2001
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