Diagnostic Information 2-7
4400-001
Service Checks
Carrier Transport Service Check
FRU Action
1 System Board
Carrier Transport
Motor
Check the carrier transport motor connector CN5.
If connected, check for approximately 28 volts on
pins 1 and 2 or at the wire connections located on
the rear of the carrier transport 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 (CN5)
disconnected from the system board, check for 0
to 16 ohms between the following pins on the
motor:
CN5-1 and CN5-2
If the readings are incorrect, replace the print
engine. Go to the “Carrier Transport Motor
Removal” on page 4-25.
3 Carrier Guide Rod Clean the carrier rod.
Note: Lubricate the rod and the carrier rod bearing
surfaces with grease P/N 99A0394.
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