Lexmark MS911 Service Manual page 76

Action
Step 3
Check the sensor (tray 1 paper feed).
Is it free of damage?
Step 4
Enter the Diagnostics menu, and then navigate to:
SENSOR TESTS > PRINTER SENSOR TESTS > Tray 1 paper feed
Does the sensor status change while toggling the sensor?
Step 5
a
Reseat the tray 1 paper feed sensor cable.
b
Check the sensor cable for damage, and replace if necessary.
Does the problem remain?
Step 6
Replace the sensor (tray 1 paper feed).
Does the problem remain?
Step 7
Enter the Diagnostics menu, and then navigate to:
INPUT TRAY TESTS > Feed Tests > Tray 1
Does the leading edge of the paper reach the sensor (tray 1 paper feed)?
Step 8
Check the tray 1 feed, pick, and separator rollers for damage, and replace
if necessary.
Note: If the page count is over 50K, then clean the rollers.
Does the problem remain?
Step 9
Enter the Diagnostics menu, and then navigate to:
MOTOR TESTS > PRINTER MOTOR TESTS > Paper feed
Does the motor run?
Step 10
a
Reseat the feed motor cable.
b
Check the feed motor cable for damage, and replace if necessary.
Does the problem remain?
Yes
Go to step 4.
Go to step 7.
Go to step 6.
Go to step 7.
Go to step 14.
Go to step 9.
Go to step 13.
Go to step 11.
Diagnostic information
76
4021
No
Go to step 6.
Go to step 5.
The problem is solved.
The problem is solved.
Go to step 8.
The problem is solved.
Go to step 10.
The problem is solved.