Action Yes No
Step 17
a Check the transport drive belt for proper tension, and adjust if
necessary.
b Check the transport drive assembly for wear or damage, and replace
if necessary.
Does the problem remain?
Go to step 18. The problem is solved.
Step 18
Replace the motor (tray 2 transport).
Does the problem remain?
Go to step 19. The problem is solved.
Step 19
Check the tray 2 transport roller for damage, and replace if necessary.
Does the problem remain?
Go to step 20. The problem is solved.
Step 20
a Make sure that the tray transport guide is properly installed.
b Make sure that the guide is clear of obstructions.
c Check the guide for damage, and replace if necessary.
Does the problem remain?
Go to step 21. The problem is solved.
Step 21
a Make sure that the paper feed unit is properly installed.
b Make sure that the unit is clear of obstructions.
c Check the unit for damage, and replace if necessary.
Does the problem remain?
Go to step 22. The problem is solved.
Step 22
Make sure that the blue screws and marked screws in the paper path area
are tightened.
Does the problem remain?
Go to step 23. The problem is solved.
Step 23
Check the expansion controller board pins for damage, and replace if
necessary. See
“Expansion controller board removal” on page 351.
Does the problem remain?
Go to step 24. The problem is solved.
Step 24
Check the engine controller board pins for damage, and replace if
necessary. See
“Engine controller board removal” on page 353.
Does the problem remain?
Contact the next level
of support.
The problem is solved.
7421
Diagnostic information
89
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