Lexmark 1000 - Manual (Page 20)

2-8 Service Manual
4096-00X
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 on and verify the paper feed motor
activates. Be sure the end-of-form sensor lever is
in the down position. Turn the printer off and
disconnect N7 from the system board. Check for
motor pins shorted to the motor housing. If you
find a shorted pin, replace the paper feed motor. If
you still have a failure after replacing the paper
feed motor, replace the system board.
2 Paper Feed Motor A noisy or chattering motor or a motor that fails to
turn, can be caused by an open or short in the
motor, an open or short in the motor driver on the
system board, or a bind in the paper feed
mechanism. With the paper feed motor cable N7
disconnected from the system board, check for 80
ohms (±7 ohms) between the following pins on the
motor: Pin 1 to Pin 2, Pin 1 to Pin 4
160 ohms (±7 ohms) between pins 2 and 4. If the
readings are incorrect, replace the paper feed
motor and drive train assembly.
Although the paper feeds in a forward direction
only, the paper feed motor turns in two directions.
If the paper feed motor turns in one direction only,
replace the system board.
Binds in the paper feed motor or gear train can
cause intermittent false paper jam errors. Remove
the paper feed motor and check the shaft for binds.
Also check for loose or worn motor gear.