Adf & Scanner Print Quality; Image Quality Symptoms; Dark Image Quality (Using Adf Or Scanner) - Lexmark X792 Service Manual

7562
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 —
•
Vertical stripes—
•
Spots— "Spots (using flatbed scanner)" on page
•
Skew—"Skew (using ADF)" on page
•
Media damage—
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
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?
2-42
Service Manual
"Dark image quality (using ADF or Scanner)" on page
"Vertical lines (process direction using the ADF)" on page
2-45.
"Media damage (using ADF)" on page
Check
2-42.
2-43.
2-46.
Yes
Clean both sides
of the large and
small platen
glass.
Clean the three
mirrors in the
scanner unit
assembly.
Clean the white
strip and POR
the machine.
Clean the
scanner lens.
Replace the
CCD/card lens
assembly.
Go to
Replace the
scanner
controller card
assembly.
Go to "ADF
controller card
removal" on
page 4-153.
2-43.
No
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Problem solved.
Problem solved.