Lexmark 4059-XXX manual Input Sensor Service Check

4059-XXX

	FRU	Action
4	Engine Board	Check the +42 V dc test point on the
		engine board. Go to “Engine Board”
		on page 5-4in the locations section to
		find the +42 V dc test point. Be careful
		not to short between the test point and
		any other pin. The voltage measures
		approximately +42 V dc. If correct,
		replace the engine board.
5	LVPS Interconnect Board	Check the voltage at CN3-18 on the
		LVPS. It measures approximately
		+42 V dc. If incorrect, replace the
		LVPS. If correct, replace the
		interconnect board.

Input Sensor Service Check

Service Tip: Run the base sensor test. Check the input sensor for proper operation. The display changes from open to closed as the sensor flag is manually moved in and out of the sensor.

Service Tip: Run a Diagnostic Print Test in the continuous mode with the controller board removed. A defective input sensor or circuit causes the first copy to exit only partially through the fuser assembly.

	FRU	Action
1	Input Sensor Flag	Check the input sensor flag for
		damage and proper operation. If a
		problem is found, repair as
		necessary.
2	Engine Board	Check for approximately +5 V dc at
		J10-10 on the engine board. If
		incorrect, replace the engine board.
3	Input Sensor Cable	Check the continuity of the input
		sensor cable. If incorrect, replace the
		cable. If correct, replace the input
		sensor assembly.

2-574059 Service Manual