Lexmark 4090-001 - Manual (Page 19)

Diagnostic Information 2-8
4090-001
Paper Feed Service Check
If your printer does not have paper jam problems, continue with the
service check. If your printer does have a paper jam problem,
examine it for the following before you begin the service check:
•
Check the entire paper path for obstructions.
•
Be sure there is not too much paper in the sheet feeder.
•
Be sure the correct type of paper is being used.
•
Check for static in the paper.
FRU Action
1 System Board With J5 disconnected and power on, check for
+30 V dc between J5-1 and ground, and between
J5-2 and ground on the system board. If the
voltage is not present, check for motor pins
shorted to the motor housing. If you find a shorted
pin, replace the motor. If you still have a failure
after replacing the motor, replace the system
board.