Lexmark 4090-001 manual Perform the ’Paper Path Service Check’ on

4090-001

	FRU	Action
2	Paper Feed 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 paper feed mechanism
		With the paper feed motor cable disconnected
		from the system board, check for 5 to 10 ohms
		between pin 1 and 4 on the motor cable.
		If the reading is incorrect, replace the motor.
		Check for motor pins shorted to the motor housing.
		If you find a shorted pin, replace the motor. If the
		failure remains, replace the system board.
		Although the paper feeds in a forward direction
		only, the paper feed motor turns in two directions.
		If the paper feed motor turns in one direction only,
		replace the system board.
		Binds in the paper feed motor or gear train can
		cause intermittent false paper jam errors. Remove
		the paper feed motor and check the shaft for binds.
		Also check for loose or worn motor gear.
3	Gears	Check for binds in the gear train and paper feed
		mechanism by rotating the large feed roll by hand.
		If you notice a bind, isolate it by removing one of
		the small idler gears on the inside of the left side
		frame. Replace any worn or binding gears or
		rollers.
4	Feed Arm	At the beginning of the paper feed operation, the
	Assembly	paper feed motor reverses momentarily to allow
		the feed arm pawl to drop off the home position
		notch in the left side frame. If the pawl fails to drop
		off the notch, check the feed arm assembly for
		binds, and worn or broken parts.
5	Paper Path	Perform the ’Paper Path Service Check’ on page
		2-10, starting at Step 1.

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