Action Yes No
Step 3
a Remove the duplex/MPF tray. See “Duplex/MPF tray removal”
on page 434.
b Enter the Diagnostics menu, and then navigate to:
Printer diagnostics and adjustments > Sensor tests
c Find the sensor (Duplex path).
Does the sensor status change while toggling the sensor?
Go to step 7. Go to step 4.
Step 4
a Remove the right cover. See “Right cover removal” on
page 420.
b Check the sensor cable J27 on the controller board for proper
connection.
Is the cable properly connected?
Go to step 6. Go to step 5.
Step 5
Reseat the cable.
Does the problem remain?
Go to step 6. The problem is
solved.
Step 6
Replace the sensor. See
“Sensor (duplex path) with cover
removal” on page 466.
Does the problem remain?
Go to step 7. The problem is
solved.
Step 7
Check the upper redrive for damage.
Is the upper redrive free of damage?
Go to step 9. Go to step 8.
Step 8
Replace the upper redrive. See
“Upper redrive removal” on
page 453.
Does the problem remain?
Go to step 9. The problem is
solved.
Step 9
a Remove the rear door. See “Rear door removal” on page
449.
b Enter the Diagnostics menu, and then navigate to:
Printer diagnostics and adjustments > Motor tests
c Select the motor (Duplex), and then touch Start.
Does the motor run?
Go to step 12. Go to step 10.
4064
Diagnostics and troubleshooting
109
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