Lexmark 5021-0XX manual Power supply fan service check, Fan removal on, Interlock switch

			5021-0XX
912—Power supply fan service check
Step	Questions / actions	Yes	No
1	Turn printer off and remove	Go to step 2.	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
	DCN20?
2	Ensure rear cover	Replace power	Replace I/O
	assembly cover is shut.	supply fan	board. See “I/O
	Override top and front	assembly. See	board removal”
	cover interlock switches.	“Power supply	on page 4-70.
	For location, see	fan removal” on	Retest printer. If
	“Interlock switch	page 4-74.	error clears,
	locations” on page 5-8.	Retest printer. If	problem solved,
	Reconnect operator panel.	error clears,	else go to step 3.
	Turn printer on and check	problem solved,
	for 24VDC between DCN20	otherwise go to
	pin 1 and power ground	step 3.
	(you can touch negative
	lead of voltmeter to metal
	bracket that holds I/O
	board to obtain ground.) Is
	voltage present and
	correct?
3	Turn printer off and check	Replace engine	Replace cable.
	cable that connects engine	controller board.
	controller board connector	See “Engine
	I1CN to I/O board	controller
	connector DCN1 for	board removal”
	continuity and pin shorts. Is	on page 4-55.
	cable okay?

Diagnostic information 2-51