2-6 Service Manual
4402-001
Service Checks
Carrier Transport Service Check
FRU Action
1 System Board
Carrier Transport
Motor
Check the transport carrier motor connector J4. If
connected, check for approximately 28 volts on
pins 1 and 2 or at the wire connections located on
the rear of the transport carrier motor. If voltage is
incorrect, replace the system board. If voltage is
correct, check the motor for shorts.
2 Carrier Transport
Motor
Check the motor for binds, or loose motor pulley.
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 carrier transport
mechanism.
With the carrier transport motor cable (J4)
disconnected from the system board, check for 0
to 10 ohms between the following pins on the
motor:
J4-1 and J4-2
If the readings are incorrect, replace the print
engine. Go to the “Print Engine Removal” on
page 4-11.
3 Carrier Guide Rod Clean the carrier rod.
Note: Lubricate the rod and the carrier rod bearing
surfaces with grease P/N 99A0394.
