Lexmark 5021-0XX manual

5021-0XX

Step	Questions / actions	Yes	No
5	If waste toner bottle is	Go to step 6.	Problem solved.
	removed, reinsert it.
	Ensure rear cover
	assembly cover is shut.
	Override top and front
	cover interlock switches.
	For location, see
	“Interlock switch
	locations” on page 5-8.
	Reconnect operator panel.
	Turn printer on. Does 904
	error reappear?
6	Turn printer off and remove	Replace engine	Replace cable.
	engine controller board	controller board.
	shield. See “Engine	See “Engine
	controller board removal”	controller
	on page 4-55for steps to	board removal”
	remove shield. Check cable	on page 4-55.
	that connects I2CN on
	engine controller board to
	DCN3 on I/O board for
	proper connection,
	damage, pin shorting and
	continuity. Is cable okay?

2-36Service Manual