Lexmark X792 7562-4xx, Service Manualv

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Diagnostic information
2-53
7562
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ADF & scanner print quality
Note: Get a printout as a base, and then follow the symptom table to identify the possible failing FRU.
Image quality symptoms:
•
Dark print — “Dark image quality (using ADF or Scanner)” on page 2-53 .
•
Vertical stripes— “Vertical lines (process direction using the ADF)” on page 2-54 .
•
Spots— “Spots (using flatbed scanner)” on page 2-54 .
•
Skew— “Skew (using ADF)” on page 2-56 .
•
Media damage— “Media damage (using ADF)” on page 2-57 .
Note: When horizontal lines and/or spots occur periodically, it is possibly caused by a particular roll. In this
case, measure the interval on the print test, and check the relation to the roll in the printer. The interval does not
necessarily match circumference of the roll.
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
CCD/card lens
assembly.
Go to
Problem solved.
6 Perform a print test using the ADF & scanner unit
assemblies.
Does the error continue?
Replace the
scanner
controller card
assembly.
Go to “ADF
controller card
removal” on
page 4-174
.
Problem solved.