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ADF & Scanner Image Quality
Dark image quality (using ADF or Scanner)
Leading edge
Leading edge
Trailing edge
Trailing edge
Before starting, check the media route for foreign objects, such as staples, clips, and scraps, in the media path.
Step
1
Check the large and small platen glass on the scanner
unit assembly.
Is the large and small platen glass contaminated?
2
Check the three mirrors in the scanner unit assembly.
Are the three mirrors contaminated or show signs of
dust?
3
Check the white strip on the bottom of the large platen
glass.
Is the white strip contaminated?
4
Check the scanner lens.
Is the scanner lens contaminated?
5
Perform a print test using the ADF & scanner unit
assemblies.
Does the error continue?
6
Perform a print test using the ADF & scanner unit
assemblies.
Does the error continue?
Check
Yes
No
Clean both sides
Go to step 2.
of the large and
small platen
glass.
Clean the three
Go to step 3.
mirrors in the
scanner unit
assembly.
Clean the white
Go to step 4.
strip and POR
the machine.
Clean the
Go to step 5.
scanner lens.
Replace the
Problem solved.
CCD/card lens
assembly.
Go to
Problem solved.
Replace the
scanner
controller card
assembly.
Go to
"Scanner
controller card
assembly
removal
(models MB780)"
on
page
4-132.
Diagnostic information
7462
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