Lexmark 1020 - Manual (Page 16)

2-6
4078-00X
Service Checks
Carrier Transport Service Check
FRU Action
1 System Board Check the motor for binds, or loose motor pulley.
Turn the printer off and disconnect CN4 from the
system board. Turn the 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 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.
2 Carrier Transport
Motor 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:
CN4-1 and CN4-2
CN4-3 and CN4-4
If the readings are incorrect, replace the motor.
3 Carrier Guide Rod Clean the 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.