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4091-001
Service Checks
Carrier Transport Service Check
FRU
1
System Board
2
Carrier Transport
Motor
3
Carrier Guide Rod
4
Carrier Transport
Belt
Idler Pulley Parts
Carrier Frame
6
Home Position
Sensor
Action
Unplug the printer and disconnect CN6 from the
system board. Plug in the printer and check for a
pulse of (approximately) 10 V dc between
CN6-1and ground, on the system board. If the
voltage is not present, 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 system board.
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
disconnected from the system board, check for
zero to ten (0 - 10) ohms between the following
pins on the motor:
CN6-1 and CN6-2
CN6-3 and CN6-4
If the readings are incorrect, replace the motor.
Clean the carrier rod.
Note: Lubricate the rod and the carrier rod bearing
surfaces with grease P/N 1329301.
Check for worn, loose or broken parts. Check for
obstructions blocking carrier movement.
Carrier to carrier frame engagement should be
lubricated with grease P/N 1329301.
Unplug the printer and disconnect CN5 from the
system board. Plug in the printer and check for
5 V dc between CN5-3 and ground, at the system
board. If the voltage is present, replace the home
position sensor. If the voltage is not present,
replace the system board.
Diagnostic Information 2-3
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