Lexmark Medley 4012-005, Service Manual

Page: 22 / 90

4012-0XX
13
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 printer board
• A bind in the paper feed mechanism
Warning: Disconnecting the paper feed
motor while the machine is plugged in can
damage the printer board. Voltage is
present on the board even with the power
switch off.
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 printer 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
printer 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 gears.
3 Gears 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 and
rotate the gears again. Replace any worn
or binding gears, rollers, or bearings.
FRU Action