Lexmark 1020 manual Service Checks, Carrier Transport Service Check

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	A noisy or chattering motor or a motor that fails to
	Motor	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	Check for worn, loose or broken parts. Check for
	Belt	obstructions blocking carrier movement.
	Idler Pulley Parts	Carrier to carrier frame engagement should be
	Carrier Frame
		lubricated with grease P/N 1329301.

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