Canon imageCLASS X LBP1238, Service Manual

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Check item Checking method Assumed cause
Transfer failure Check the evenness of density. Failure of transfer system
Failure of Transfer Roller
White line Check that no white line appears on the image. Failure of developing system
Uneven Pitch Check that no line appears in the horizontal scanning direction
of the image. Failure of Photosensitive Drum
Failure of developing system
Failure of laser exposure system
Drive-related failure
Uneven Density Check the evenness of density. Failure of Photosensitive Drum
Failure of developing system
Failure of Transfer Roller
● White Pattern (TYPE = 3)
Check item Checking method Assumed cause
Black line Check that no black line appears on the image. Failure of developing system
Failure of cleaning (drum)
Failure of Transfer Roller
Fogging Check that no fogging appears on the image. Failure of Photosensitive Drum
Failure of laser exposure system
Failure of developing system
7. Troubleshooting
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