Lexmark MX71x Service Manual page 187

Action
Step 4
Remove the left cover. Reseat the cable J11 on the controller board, then
reseat the same cable on the sensor (paddle motor HP) end. POR the
machine.
Does the error remain?
Step 5
Reseat the cable J5 on the controller board, then reseat the same cable
on the motor end. POR the machine.
Does the error remain?
Step 6
Check the paddle motor. If damaged, then replace the paddle motor. See
"Paddle drive motor removal" on page
Does the error remain?
Step 7
Check the paddle assembly gear box:
• Check the gears for damage
• Check the sensor flag for damage
Is the paddle assembly gear box functional and free of damage?
Step 8
Open the left cover, reseat all connectors on the controller board and then
POR the machine.
Does the error remain?
753.
Diagnostic information
187
Yes No
Replace the sensor The problem is solved.
(paddle motor HP). See
"Sensor (paddle motor
HP) removal" on
page 736.
If the error persists,
then go to step 5.
Go to step 6. The problem is solved.
Go to step 7. The problem is solved.
Go to step 8. Replace the staple
finisher option. See
"Staple finisher/offset
stacker option
removal" on page
723.
Replace the controller The problem is solved.
board. See "Stapler/
offset stacker
controller board
removal" on page
756.
If the error persists,
then replace the staple
finisher. See "Staple
finisher/offset stacker
option removal" on
page 723.
7463