Lexmark 4076-0XX User Manual page 27

4076-0XX
FRU OR PROCEDURE
2 Paper Feed Motor
3 Gears
ACTION
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
• A bind in the paper feed mechanism
Check for 100 ohms (±20 ohms)
between the following pins on the
motor:
Pin 1 to Pin 4
Pin 2 to Pin 4
Pin 3 to Pin 5
Pin 3 to Pin 6
If the readings are incorrect, replace
the motor. Check for motor pins
shorted to the motor housing. If you
find a shorted pin, replace the motor.
If the failure remains, replace the sys-
tem board.
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
Check for binds in the gear train and
paper feed mechanism. To do this,
rotate the largest gear by hand. If you
notice a bind isolate it by removing
the small idler gear on the outside of
the right side plate. Replace any worn
or binding gears, rollers, or bearings.
Diagnostic Information
15