Lexmark MX71x Service Manual page 303

Action
Step 3
Check the lower interface cable. If damaged, then replace the lower
interface cable. See "Mailbox lower interface cable removal" on
page 812.
Reseat the connector J1 on the controller board, then POR the machine.
Does the error remain?
Step 4
Open the left cover. Reseat the main motor cable J6 on the controller
board, and then POR the machine.
Does the error remain?
Step 5
Note: The sensor (mailbox rear door interlock) should be disabled by
blocking the sensor.
Open the mailbox rear door. Do a feed test. Enter Diagnostics menu and
navigate to:
Output bin tests > Feed to all bins
Check if the mailbox transport rollers rotate when the test is performed.
Does the main motor make the transport rollers rotate?
Step 6
Open the mailbox left cover. Check the main drive gear for damage and
obstructions.
Note: To access the main drive gear, see
removal" on page 800.
Is the main drive gear free of damage?
Step 7
Reseat all connectors on the controller board, then POR the machine.
Does the error remain?
"Mailbox main drive gear
Diagnostic information
303
Yes No
Go to step 4. The problem is solved.
Go to step 5. The problem is solved.
Go to step 6. Replace the mailbox
main motor. See
"Mailbox main motor
removal" on page
804.
Go to step 7. Replace the mailbox
main drive gear. See
"Mailbox main drive
gear removal" on
page
Replace the controller The problem is solved.
board. Go to "Mailbox
controller board
removal" on page
809.
If the error persists,
then replace the
mailbox option. See
"Mailbox option
removal" on page
791.
7463
800.