Canon DR-1210C Service Manual page 98

CHAPTER 5 TROUBLESHOOTING
6. Spots and Streaks on Image
If the reading glass surface is dirty when the flatbed scanning is used, the state of the spot on
the glass (shape and color) appears on the scanned image. In case of the feeder scanning,
spots on the feed system including the feed roller etc. appear on the document or those on
the reading glass for the feeder make streaks in the feed direction on the scanned image.
On the other hand, white streaks appearing on the scanned images for both flatbed and
feeder scanning are caused by dirty shading sheet in most cases. In particular, if white
streaks appear outstanding in a slightly light area on a color image, it can be said that it is
caused by dirty shading sheet.
Cause/Faulty
location
Roller unit and separa-
tion pad (for feeder
scanning)
Feed unit (for feeder
scanning)
Reading glass
5-18
Step Check item
1 Are the surfaces clean?
2 Is the feed path clean?
3 Are the reading glasses
clean?
(for both flatbed and feeder
scanning)
Table 5-406
COPYRIGHT © 2006 CANON ELECTRONICS INC.
Result Action
NO Clean or replace the
roller unit and/or the
separation pad.
NO Clean.
NO Clean.
Replace the main body
if scratches are found or
the back surface is dirty.
YES The reading unit or the
shading sheet is faulty.
Replace the main body.
CANON DR-1210C FIRST EDITION FEB. 2006