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NP6251
Model :
Location
: PHOTOSENSITIVE DRUM ASSEMBLY
Subject
: MEASURES TO TAKE WHEN BLURRED IMAGES OCCUR
: Notification is made here of the measures to take when blurred images caused by the photosensitive
Reason
drum occur.
: <Phenomenon>
Details
Blurred images caused by the photosensitive drum may occur over time (smeared images: screen dot
reproduction faults, text sharpness faults).
<Cause>
Resistance is lowered due to moisture in the air for the film (on the drum surface) made by chemical
bonding of discharged materials to the organic matters in the toner ingredients. The lowered resistance
causes the charge on the drum surface to shift sideways with the consequence of smearing and
blurring of images.
: If any of the following symptoms caused by the photosensitive drum occur in the field, use the drum-
Servicing
cleaning powder (CK-0429) and follow the cleaning procedure described below. Also, when replacing
the cleaning blade (standard for periodical replacement is 500,000 copies), check the image; in case of
the similar symptoms, perform the drum cleaning by following the same procedure.
<Symptoms>
• Vertical band unevenness on half tones and screen dot images with a corresponding unevenness on
the photosensitive drum.
• Blurred images conceivably attributed to the photosensitive drum (because no other abnormality
can be found).
Service Bulletin
Issued by Canon Europa N.V.
6251-009
No.:
(FF-T01-H2-000016-01)
DATE:
24.07.98
COPIER
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