Lexmark 5021-0XX manual Board removal See Toner, On page 4-70. If Present sensor

5021-0XX

Step	Questions / actions	Yes	No
6	Push toner cartridge fully	Replace I/O	Replace toner
	in. Check voltage level on	board. See “I/O	present sensor.
	DCN2 pin 1. Is 0 VDC	board removal”	See “Toner
	present?	on page 4-70. If	present sensor
		problem	removal” on
		persists, replace	page 4-63.
		engine controller
		board. See
		“Engine
		controller
		board removal”
		on page 4-55.
7	Turn printer off. Check	Replace toner	Replace cable.
	cable for continuity that	present sensor.
	connects DCN2 pins 1, 2,	See “Toner
	and 3 to toner present	present sensor
	sensor. Also check for	removal” on
	shorted pins. Is cable	page 4-63.
	okay?
8	Touch positive lead to	Replace I/O	Go to step 9.
	DCN13 pin 9 to ensure 5	board. See “I/O
	VDC is being supplied to I/	board removal”
	O board. Also check pin 11	on page 4-70.
	for 5 VDC. Is 5 VDC
	present?
9	Check cable continuity	Replace LVPS.	Replace cable.
	between LVPS ACN1 and I/	See “Low
	O board DCN13. Also	voltage power
	check for shorted pins. Is	supply (LVPS)
	cable okay?	with cage
		removal” on
		page 4-60.

2-82Service Manual