Lexmark 5016-001 manual If correct, check the voltage on switch terminal

5016-001

	FRU	Action
2	Interlock Switch	Switch S2 has two functions. Two terminals control
	S2	+24 V dc to the engine board and four terminals
		control the AC line voltage to the fuser lamps.
		Terminal A3 (red wires) and terminal B3 (blue
		wires) control the +24 V dc supply to the engine
		board. When this circuit opens, a Close Door
		message displays.
		CAUTION: Be careful when checking the voltages
		on switch S2, as the AC line voltage may be
		present on terminals A1 (brown), B1 (yellow), A2
		(brown) or B2 (yellow).
		Check the voltage at terminal B3 (blue wires). It
		should read approximately +24 V dc.
		•	If incorrect, go to the “Printhead Service
			Check” on page 2-77.
		•	If correct, check the voltage on switch terminal
			A3 (red wires).
			• If incorrect, check the switch for continuity
			and proper operation.
			• If correct, check the cable from the wires.
			• If incorrect, check the switch for continuity
			and proper operation.
			• If correct, check the cable from the switch
			to the engine board.
			• If incorrect, replace the cable.
			• If correct, replace the engine board.

2-46Service Manual