Actions Yes No
Step 13
a Remove the ADF rear cover.
b Reseat the CIS glass clean motor cable.
c Check the motor cable for damage, and replace if necessary.
Does the problem remain?
Go to step 14. The problem is solved.
Step 14
a Make sure that the CIS glass clean belt has correct belt tension.
b Check the CIS glass clean gear and belt for wear or damage, and replace
if necessary.
Does the problem remain?
Go to step 15. The problem is solved.
Step 15
a Check the ADF glass clean roller and CIS glass clean roller for wear or
damage, and replace if necessary. See
“ADF glass cleaning roller
removal” on page 403.
b Check the ADF glass clean gear and CIS glass clean gear for wear or
damage, and replace if necessary.
Does the problem remain?
Go to step 16. The problem is solved.
Step 16
Make sure that the blue screws and marked screws along the paper path
are tightened.
Does the problem remain?
Go to step 17. The problem is solved.
Step 17
a Make sure that the ADF scan cleaning assembly and ADF CIS scan
cleaning assembly are properly installed
b Make sure that the paper path is clear of debris or dust.
c Check the assemblies for damage, and replace if necessary.
Does the problem remain?
Go to step 18. The problem is solved.
Step 18
Check the ADF controller board for damaged pins, and replace if
necessary. See
“ADF controller board removal” on page 396.
Note: Make sure to perform ADF scanner adjustment after replacing
the ADF controller board.
Does the problem remain?
Go to step 19. The problem is solved.
Step 19
a Make sure that the ADF CIS cable is properly installed.
b Check the cable for damage, and replace if necessary.
Does the problem remain?
Contact the next level
of support.
The problem is solved.
7421
Diagnostic information
118
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