Canon imageRUNNER ADVANCE 525 I, Service Manual

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Check item Check method Assumed cause
Transfer fail-
ure Check the evenness of halftone density. Check whether
uneven image or foggy image appears. Transfer system failure is considered.
Uneven pitch Check whether lines appear on the image in the horizontal
scanning direction. Drum failure, developing system failure, laser exposure
system failure or drive-related failure is considered.
Uneven densi-
ty(rear/front) Check the density difference between the front and rear
sides. Drum failure or developing system failure isconsidered.
■ Horizontal line (TYPE=8/9/10)
Check item Check method Assumed cause
Black line Check whether black lines appear on the image. Laser light path failure, developing system failure, cleaning
(drum) failure or transfer roller failure is considered.
White line Check whether white lines appear on the image. Developing system failure is considered.
Uneven pitch Check whether lines appear on the image in the horizontal
scanning direction. Drum failure, developing system failure, laser exposure
system failure or drive-related failure is considered.
Uneven densi-
ty(rear/front) Check the density difference between the front and rear
sides. Drum failure or developing system failure isconsidered.
6. Troubleshooting
247