Action Yes No
Step 4
a Make sure that the sensor (SHPF top door) is properly installed.
b Make sure that the sensor is free of debris or dust.
c Reseat the cable on the sensor. Check the cable for damage, and
replace if necessary.
d Check the sensor for damage.
Is the sensor free of damage?
Go to step 6. Go to step 5.
Step 5
Replace the sensor. See
“Sensor (SHPF top door) removal” on page
386.
Does the problem remain?
Go to step 6. The problem is solved.
Step 6
a Reseat the cable J4 and J5 on the SHPF controller board.
b If applicable, reseat the junction connectors on the cables.
c Make sure that the cables are not in the path of moving parts.
d Check the cables for damage, and replace if necessary.
Does the problem remain?
Go to step 7. The problem is solved.
Step 7
Replace the sensor. See
“Sensor (SHPF top door) removal” on page
386.
Does the problem remain?
Go to step 8. The problem is solved.
Step 8
a Reseat the interface cable on the SHPF controller board and printer
controller board.
b Reseat the junction connector on the cable.
c Check the cable for damage, and replace if necessary.
Does the problem remain?
Go to step 9. The problem is solved.
Step 9
Replace the controller board. See
“SHPF controller board removal” on
page 364.
Does the problem remain?
Contact the next level
of support.
The problem is solved.
4021, 7421
Diagnostic information
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