Lexmark 1020 - Manual (Page 19)

Diagnostic Information 2-9
4078-00X
Paper Feed Service Check
If your machine does not have paper jam problems, continue with
the service check. If your machine 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 Turn the printer off and disconnect CN6 from the
system board. Turn the printer on and check for a
pulse of 24 V dc between CN6-1 and ground and
CN6-2 and ground on the system board, as the
machine goes through P-O-S-T. 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.