Action Yes No
Step 6
a Test the sensors.
Enter the Diagnostics menu, and then navigate to:
SENSOR TESTS > Staple and Hole Punch Finisher Sensor Tests >
Stapler center or Stapler home
b Toggle the sensor.
Does the sensor status change while toggling the sensor?
Go to step 8. Go to step 7.
Step 7
Replace the sensor. See
“SHPF staple unit position sensors removal” on
page 369.
Does the problem remain?
Go to step 8. The problem is solved.
Step 8
a Reseat the cable J11 on the SHPF controller board.
b If applicable, reseat the junction connectors on the cable.
c Make sure that the cable does not block the path of moving parts.
d Check the cable for damage, and replace if necessary.
Does the problem remain?
Go to step 9. The problem is solved.
Step 9
a Make sure that the staple unit assembly belts, gears, and rail are
properly installed.
b Check the assembly parts for wear or damage, and replace the parts
if necessary. See
“SHPF—Staple unit assembly” on page 593.
Does the problem remain?
Go to step 10. The problem is solved.
Step 10
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 11. The problem is solved.
Step 11
a Reseat all the cables on the SHPF controller board.
b Reset the printer.
Does the problem remain?
Go to step 12. The problem is solved.
4021, 7421
Diagnostic information
141
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