Transport Service Check - Lexmark Medley 4012-009 Service Manual

4012-0XX

Transport Service Check

FRU
1 Transport Motor
2 Printer Board
3 Transport Belt
Carrier Guide or Guide Rod
Idler Pulley Parts
Cable Clip
4 Encoder Strip
5 Printhead Cables
6 Maintenance Station
21
Action
Check the motor for binds, or loose motor
pulley.
Warning: Disconnecting the transport
motor while the machine is plugged in can
damage the printer board. Voltage is
present on the board even with the power
switch off. Unplug the machine before pro-
ceeding.
Disconnect the transport motor (J6) from
the printer board. Check for 8 to 18 ohms
between pins 1 and 2 on the motor cable.
If the reading is incorrect, replace the
motor.
Check for motor pins shorted to the motor
housing. If you find a pin shorted to the
housing, replace the motor. If the failure
remains, replace the printer board.
Unplug the machine and disconnect J6
from the printer board. Plug the machine
in and check for a pulse of 3 to 5 V dc
between J6-1 and ground and between
J6-2 and ground on the printer board as
the machine goes through POST.
Check for worn, loose or broken parts.
Clean the carrier guide rod. Do not lubri-
cate the rod or the carrier rod bearings.
Check for obstructions blocking carrier
movement.
Check for wear and dirt.
Be sure the printer board connectors J1
and J2 are fully seated. Check the cables
for damage.
A problem with the maintenance station
can cause carrier movement problems at
the right margin:
Go to the "Maintenance Station Service
Check" on page 9.