Action Yes No
Step 8
a Make sure that the duplex transport assembly is properly installed.
b Make sure that the assembly is clear of obstructions.
Does the problem remain?
Go to step 9. The problem is solved.
Step 9
Check the duplex transport assembly, including its rollers and guides for
damage, and replace if necessary. See
“Duplex transport assembly
removal” on page 285.
Does the problem remain?
Go to step 10. The problem is solved.
Step 10
Enter the Diagnostics menu, and then navigate to:
MOTOR TESTS > PRINTER MOTOR TESTS > Duplex transport tray
Does the motor run?
Go to step 13. Go to step 11.
Step 11
a Reseat the duplex transport motor cable.
b Check the cable for damage, and replace if necessary.
Does the problem remain?
Go to step 12. The problem is solved.
Step 12
Replace the motor (duplex transport). See
“Motor (duplex transport)
removal” on page 293.
Does the problem remain?
Go to step 13. The problem is solved.
Step 13
a Make sure that the registration unit is properly installed.
b Check the unit, including the duplex pass through 2 and duplex exit
rollers for wear or damage, and replace if necessary. See
“Registration
unit assembly removal” on page 314.
Does the problem remain?
Go to step 14. The problem is solved.
Step 14
Enter the Diagnostics menu, and then navigate to:
MOTOR TESTS > PRINTER MOTOR TESTS > Transport tray
Does the motor run?
Go to step 18. Go to step 15.
Step 15
a Reseat the transport motor cable.
b Check the cable for damage, and replace if necessary.
Does the problem remain?
Go to step 16. The problem is solved.
7421
Diagnostic information
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