Lexmark OptraTM Exit Sensor Service Check, Fan Service Check, 4026-0XX, Diagnostic Information

4026-0XX

Exit Sensor Service Check

	FRU	Action
1	Engine Board	Disconnect the exit sensor cable from the
		engine board. Check for +4.5 V dc to +5.5 V dc
		at CN8-1. If incorrect, replace the engine board.
2	Exit Sensor	Be sure the exit sensor is snapped in place and
		the cable is firmly connected.
3	Exit Sensor	Check the flag for damage and free movement
	Flag	and replace as necessary. Be sure the exit sen-
		sor spring is properly installed and not discon-
		nected, damaged, or missing.
		Reconnect the exit sensor cable and check the
		voltage at CN8-3 on the engine board as you
		press the exit sensor flag. The voltage should
		change as the flag is moved in and out of the
		sensor. If incorrect, replace the exit sensor.
4	Exit Sensor	Check the continuity of the cable. If incorrect,
	Cable	replace the exit sensor cable.
Fan Service Check
	FRU	Action
1	Engine Board	Turn the printer power off. Disconnect CN11
		on the engine board. Turn the printer on and
		measure the voltage between CN11-1 and
		CN11-2. The voltage should read approxi-
		mately +24 V dc. If incorrect, replace the
		engine board.
		If correct, turn the printer off and connect
		CN11. Monitor the voltage between ground
		and CN11-1 (FAN*) immediately as you power
		on the printer. The voltage should go from +24
		V dc with the fan motor off to approximately 0
		V dc when the motor turns on. If incorrect,
		replace the fan motor and cable assembly.
2	Fan Motor/	Be sure the fan is properly installed if the fan
	Cable	is noisy. If correct, replace the fan motor
		assembly.

Diagnostic Information 2-17