Lexmark WinWriter 100, Service Manual

Page: 22 / 77

4076-0WJ
11
FRU OR PROCEDURE ACTION
1 System Board With J5 disconnected and power on,
check for +24 V dc between J5-3 and
ground, and between J5-4 and
ground on the system board. If the
voltage is not present, check for
motor pins shorted to the motor hous-
ing. If you find a shorted pin, replace
the motor. If you still have a failure
after replacing the 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
• 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