Lexmark X746de Service Manual page 98

7526
Step Questions / actions
1. Connect a new MPF motor with cable to
4
the JDX1 connector on the system board
from outside of the machine.
2. Bring the printer up in Diagnostics Menu
(Turn off the printer, press and hold
buttons 3 and 6, then turn on the printer).
3. Navigate to MOTOR TESTS > Duplex >
Forward or Reverse.
Note: Perform this test for 5 to 10
seconds only.
4. Navigate to MOTOR TESTS > MPF Test>
Forward or Reverse.
Note: Perform this test for 5 to 10
seconds only.
5. Check if the motor would turn for each
test.
Does this clear the problem?
1. Disconnect the MPF motor cable on the
5
motor side.
2. Connect a new motor from outside of the
machine.
3. Bring the printer up in Diagnostics Menu
(Turn off the printer, press and hold
buttons 3 and 6, then turn on the printer).
4. Navigate to MOTOR TESTS > Duplex >
Forward or Reverse.
Note: Perform this test for 5 to 10
seconds only.
5. Navigate to MOTOR TESTS > MPF Test>
Forward or Reverse.
Note: Perform this test for 5 to 10
seconds only.
6. Check if the motor would turn for each
test.
Does the error still exist?
Connect a new MPF motor cable to the old
6
MPF motor and connect it to JDX1 connector
on the system board.
Does the error still exist?
1. Open the front door cover.
7
2. Check the duplex reference edge guide
assembly for any damage.
3. Check rollers and belts for damage and
misalignment.
4. Bring the printer up in Diagnostics Menu
(Turn off the printer, press and hold
buttons 3 and 6, then turn on the printer).
5. Remove the input tray.
6. Navigate to MOTOR TESTS > Duplex >
Forward.
7. Check if the duplex assembly runs.
8. Check if the MPF/duplex gear turns.
Is the duplex reference edge guide assembly
free of damage?
Service Manual
2-58
Yes
Go to step 5.
Go to step 6.
Go to step 7.
Replace the duplex
reference edge guide
assembly. See
"Duplex
reference edge guide
assembly removal" on
page 4-83.
No
Replace the system board.
See
"System board
removal" on page 4-165.
Replace the MPF duplex
motor assembly. See
"Multipurpose feeder
(MPF)/duplex motor
assembly removal" on
page 4-129.
Replace the MPF/duplex
motor cable. See
"Multipurpose feeder
(MPF)/duplex motor
cable removal" on
page 4-133.
Go to step 8.
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