Noise From Rotation Sensor 1 - Konica Minolta bizhub C650 Technical Bulletin

C451 / C550 / C650
C452 / C552 / C652 / C552DS / C652DS
SYMPTOM
Squeaking or binding noise from the cam gear in the fusing unit.
CAUSE
This is caused by a backlash of the drive gears and the brake pad gears.
COUNTERMEASURE
The drive was changed from a gear system to a belt system.
Note: Insufficient application of Drysurf can result in a different noise.
FIELD ACTION
If the fusing unit has a gear drive, replace it with a belt drive unit.
Model
C451, C550, C650
C452, C552, C652,
C552DS, C652DS
Be sure that Drysurf has been applied thoroughly to belt-drive units,
including those modified from gear drive. Apply it with a brush or by soaking.
It the belt is not covered fully with Drysurf, the high-pitch noise can return.
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Noise from Rotation Sensor 1

Description
Fusing unit (gear drive) A00JR72122
Fusing unit (belt drive)
Fusing unit (gear drive) A0P0R73311
Fusing unit (belt drive)
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Part No.
Modify to belt drive according to
previous technical bulletin #7677.
A00JR72133
Modify to belt drive according to
previous technical bulletin #7676.
A0P0R73322
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Notes
December 19, 2011