2-176 Service Manual
7462
ADF & Scanner Image Quality
Dark image quality (using ADF or Scanner)
Before starting, check the media route for foreign objects, such as staples, clips, and scraps, in the media path.
Step Check Yes No
1 Check the large and small platen glass on the scanner
unit assembly.
Is the large and small platen glass contaminated?
Clean both sides
of the large and
small platen
glass.
Go to step 2.
2
Check the three mirrors in the scanner unit assembly.
Are the three mirrors contaminated or show signs of
dust?
Clean the three
mirrors in the
scanner unit
assembly.
Go to step 3.
3
Check the white strip on the bottom of the large platen
glass.
Is the white strip contaminated?
Clean the white
strip and POR
the machine.
Go to step 4.
4
Check the scanner lens.
Is the scanner lens contaminated?
Clean the
scanner lens.
Go to step 5.
5
Perform a print test using the ADF & scanner unit
assemblies.
Does the error continue?
Replace the
scanner
controller card
assembly.
Go to “Scanner
controller card
assembly
removal
(models X651,
X652, X654 and
X656)” on
page 4-129.
Problem
resolved.
Leading edge
Trailing edge
Leading edge
Trailing edge
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