Lexmark CS720 Service Manual page 139

Action
Step 3
Check if the paper size matches the size set on the tray guides.
Does the paper size match the size set on the tray?
Step 4
Replace the paper or change the paper size setting in the tray.
Does the problem remain?
Step 5
Check the primary paper path for paper jams and obstructions.
Is the paper path free of jams and obstructions?
Step 6
Remove the paper jams and obstructions.
Does the problem remain?
Step 7
a
Enter the Diagnostics menu, and then navigate to:
Additional input tray diagnostics > Sensor tests
b
Find the sensor (Trailing edge (tray [x])).
Does the sensor status change while toggling the sensor?
Step 8
Reseat the sensor cable, and then check the sensor for
misalignment and damage.
Is the sensor properly installed and free of damage?
Step 9
Reinstall or replace the sensor. See
trailing edge) removal" on page
Does the problem remain?
Step 10
a
Enter the Diagnostics menu, and then navigate to:
Printer diagnostics & adjustments > Motor tests
b
Find the motor (Duplex/MPF), and then touch Start.
Does the motor run?
Step 11
Reseat the motor cable, and then check the motor for misalignment
and damage.
Is the motor properly installed and free of damage?
"Sensor (550-sheet tray
380.
Diagnostic information
139
Yes No
Go to step 5. Go to step 4.
Go to step 5. The problem is
solved.
Go to step 7. Go to step 6.
Go to step 7. The problem is
solved.
Go to step 10. Go to step 8.
Go to step 10. Go to step 9.
Go to step 10. The problem is
solved.
Go to step 13. Go to step 11.
Go to step 13. Go to step 12.
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