2-6

4078-00X
Service Checks

Carrier Transport Service Check

FRU Action
1 System Board Checkthe motor for binds, or loose motor pulley.
Turnthe printer off and disconnect CN4 from the
system board. Turnthe printer on and check for a
pulse of (approximately) 10 V dc between CN4-1
and ground and CN4-4 and ground, on the system
board, as the machine goes through P-O-S-T.If
the voltage is not present, check formotor 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.
2 Carrier Transport
Motor A noisy or chattering motor or a motor that fails to
turncanbecausedby:
• An open or short in the motor.
• An open or short in the motor dr iveron 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:
CN4-1 and CN4-2
CN4-3 and CN4-4
If the readings are incorrect, replace the motor.
3 Carrier Guide Rod Cleanthe carrier rod.
Note: Do not lubricate the rod or the carrier rod
bearing surface.
4 Carrier Transport
Belt
Idler Pulley Parts
Carrier Frame
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.