Lexmark MX71x Service Manual page 330

Action
Step 4
a
Open the rear door and the left cover. Make sure the sensor (HPU rear
door interlock) is properly aligned and seated.
b
Reseat the sensor cable J4 on the HPU controller board. Reseat the
same cable on its sensor end.
Does the error remain?
Step 5
a
Reseat all cables on the HPU controller board.
b
Reseat the cables J27, J19, and J13 on the stapler controller board.
Does the error remain?
Step 6
Open the left cover, reseat all connectors on the stapler controller board
and then POR the machine.
Does the error remain?
Yes
Replace the sensor
(HPU rear door
interlock). See
(HPU rear door
interlock) removal" on
page
If the error persists,
then go to step 5.
Replace the finisher
option. See
hole punch finisher
option removal" on
page
If the error persists,
then go to step 6.
Replace the stapler
controller board. See
"Stapler controller
board removal" on
page
If the error persists,
then replace the
finisher option. See
"Staple, hole punch
finisher option
removal" on page
840.
Diagnostic information
330
No
The problem is solved.
"Sensor
878.
The problem is solved.
"Staple,
840.
The problem is solved.
851.
7463