Soiled Image (Black Dots) Due To Toner Unable To Be Collected By A Scraper - Canon imagePRESS C850 Series Troubleshooting Manual

Soiled image (Black dots) due to toner unable to be collected by
a scraper
[Symptom]
When printing with the machines manufactured before the following serial numbers, soiled image (black dots) [a] may occur at
the edge of papers (front or rear side) in 37mm intervals.
The arrow [b] indicates the feed direction.
[Cause]
The double-sided tape that secures the scraper [1] which collects waste toner has a shape where the edge of the glued portion
is narrower than the center of the glued portion. Thus depending on the force to affix the scraper [1] or the displacement of the
affixing position, in a high temperature/high humidity environment, the position of the edge may be displaced [b] depending on
the force loaded in the direction of the arrow [a]. The above symptom occurs because toner cannot be collected in the area where
the sheet is displaced.
[Service work]
The developing assembly (black) is changed to the new type where the double-sided tape securing the sheet has stronger
adhesive.
- iR-ADV C9000/C7000/C9000S Series : FM4-6615-020 DEVELOPING ASSEMBLY, BK
- iR-ADV C9200/C7200 Series : FM0-2709-010 DEVELOPING ASSEMBLY, BK
- imagePRESS C800/C850 Series : FM1-C717-020 DEVELOPING ASSEMBLY, BK
[Service parts]
(iR-ADV C9000/C7000/C9000S Series)
No.
Old FM4-6615-010
1
New FM4-6615-020
(iR-ADV C9200/C7200 Series)
Part Number
DEVELOPING ASSEMBLY, BK
DEVELOPING ASSEMBLY, BK
Description
22
Q'ty. Fig. No.
1->0
0->1
102