Lexmark 5021-0XX manual Cable that connects to

5021-0XX

Step	Questions / actions	Yes	No
3	Turn printer on. Check for 5	Go to step 5.	Go to step 4.
	VDC between front cover
	interlock switch pin 1 (top
	pin) and ground. Is 5 VDC
	present?
4	Turn printer off and check	Replace LVPS.	Replace cable.
	cable for continuity	See “Low
	between LVPS ACN2 pin 1	voltage power
	and cable that connects to	supply (LVPS)
	front cover interlock switch	with cage
	pin 1. Is cable okay?	removal” on
		page 4-60.
5	Turn printer off and remove	Go to step 6.	Properly connect
	I/O board shield. See “I/O		cable.
	board removal” on
	page 4-70for steps to
	remove I/O board shield. Is
	cable properly connected
	to I/O board connector
	DCN18?
6	Turn printer on and	Go to step 7.	Go to step 8.
	override front cover
	interlock switch. Check for
	5 VDC between I/O board
	DCN18 pin 3 and ground.
	Is 5 VDC present?
7	Override top cover interlock	Replace I/O	Go to step 8.
	switch in addition to front	board. See “I/O
	cover interlock switch.	board removal”
	Check for 5 VDC between	on page 4-70. If
	I/O board DCN18 pin 1 and	problem
	ground. Is 5 VDC present?	persists, replace
		engine controller
		board. See
		“Engine
		controller
		board removal”
		on page 4-55.

2-76Service Manual