Lexmark 3000 Color Jetprinter, Service Manual

Page: 17 / 66

Diagnostic Information 2-5
Service Checks
Carrier Transport Service Check
FRU Action
1 System Board Unplug the printer and disconnect CN2 from the
system board. Plug in the printer and check for a
pulse of (approximately) 10 V dc between
CN2-1 and 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.
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
disconnected from the system board, check for
zero to ten (0 - 10) ohms between the following
pins on the motor:
CN2-1 and CN2-2
CN2-3 and CN2-4
If the readings are incorrect, replace the motor.
3 Carrier Guide Rod Clean the carrier rod.
Note: Lubricate the rod and the carrier rod bearing
surfaces with grease P/N 1329301.
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.