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CHAPTER 5 TROUBLESHOOTING
3. Streaks in Image
Streaks in the feeding direction may appear in the image due to dirt on the reading glass.
Dirt on the feeding rollers may also be transferred to the document.
When white streaks appear in the image, this is due to shading correction being performed
when the reading glass is dirty.
Cause/Faulty
Locations
Step Check Item Result Action
Reading glass 1 Is the reading glass clean? NO Clean it.
Replace the reading
guide (reading glass) if
it is damaged.
Roller 2 Is the surface clean? NO Clean or replace it.
Feed Unit 3 Is the feed path clean? NO Clean it.
CIS unit 4 Is the inside of the CIS unit
clean?
NO Clean or replace the
reading unit.
Light Adjustment 5 Have you executed Light
Adjustment?
NO Execute the adjustment.
Table 5-504
4. Image Slanted
If the document is fed at an angle, the image will become slanted.
Cause/Faulty
Locations
Step Check Item Result Action
1 Is the document placed
properly?
NO Place properly.
Placing documents
2 Are the document guides
adjusted to fit the document
width?
NO Correct the position.
Setup of “Skew
correction”
3 Was “Skew correction” set? NO Set it.
You can correct the
slant of an image using
image processing.
Feeding documents
4 Are documents fed straight? NO Perform the checks in
“IV. RESOLVING
MALFUNCTIONS,
4.The Document Does
Not Feed Properly”.
Table 5-505
5-44
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CANON ELECTRONICS INC. 2011 CANON DR-M140 FIRST EDITION