Spots (Using Flatbed Scanner) - Lexmark MB790MFP Service Manual

Step
5 Perform a print test using the ADF unit assembly.
Does the error continue?

Spots (using flatbed scanner)

Leading edge Leading edge
Trailing edge Trailing edge
Step
1 Check the large platen glass on the scanner unit
assembly.
Is the large platen glass contaminated or damaged?
2 Check the three mirrors in the scanner unit assembly.
Are the three mirrors contaminated or show signs of
dust?
Check
Check
Yes No
Problem solved.
Replace the
scanner
controller card
assembly.
Go to "Scanner
controller card
assembly
removal
(MB780
)" on
page 4-132.
Yes No
Clean or replace Go to step 2.
the scanner
platen glass
cover.
Go to "Scanner
platen glass
cover
assembly
removal
(For the
MB780
)" on
page 4-140 or
"Scanner
platen glass
cover
assembly
removal (model
MB790)" on
page 4-139.
Clean the three Go to step 3.
mirrors in the
scanner unit
assembly.
Diagnostic information
7462
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