Lexmark 3000 Color Jetprinter Service Manual - Page 17

Service Checks Carrier Transport Service Check FRU Action 1 System Board 2 Carrier Transport Motor 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. 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. 4 Carrier Transport Belt Idler Pulley Parts Carrier Frame 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. Diagnostic Information 2-5