Lexmark 5021-0XX OPC belt marker sensor service check, Removal on page 4-70for, Marker sensor

5021-0XX

994—OPC belt marker sensor service check

Step	Questions / actions	Yes	No
1	Remove photodeveloper	Clean marker	Go to step 2.
	cartridge and observe	area with cotton
	markers on side. Are belt	cloth. If problem
	markers covered with	persists go to
	foreign particles?	step 2.
2	Reinstall photodeveloper	Go to step 3.	Properly connect
	cartridge. Turn printer off		cables. If
	and remove I/O board		problem
	shield. See “I/O board		persists, go to
			step 3.
	removal” on page 4-70for
	steps to remove I/O board
	shield. Are cables DCN5
	and DCN13 properly
	connected to I/O board?
3	Ensure rear cover	I/O board is	Go to step 4.
	assembly and front cover	providing 5 VDC
	assembly are closed.	to marker
	Override top interlock	sensor. Replace
		OPC marker
	switch and turn printer on.
		sensor. See
	Wait until printer displays
		“Marker sensor
	error and remove DCN5
		assembly
	from I/O board. Check for 5
		removal” on
	VDC between DCN5 pin 1
		page 4-69. If
	(on I/O board) and ground	problem
	(you can touch negative	persists, replace
	lead of voltmeter to metal	engine controller
	bracket that holds I/O	board. See
	board to obtain ground.) Is	“Engine
		controller
	voltage present and
		board removal”
	correct?
		on page 4-55.

2-70Service Manual