Lexmark 5021-0XX Lower feed unit secondary paper assembly service check, Right cover removal on

5021-0XX

919—Lower feed unit (secondary paper assembly) 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. Retest
	board removal” on		printer. If error
	page 4-70for steps to		clears, problem
	remove I/O board shield. Is		solved,
	cable properly connected		otherwise go to
	to I/O board connector		step 2.
	DCN14?
2	Remove right cover. See	Go to step 3	Replace cable.
	“Right cover removal” on		Retest printer. If
	page 4-22. Check for		error clears,
	continuity and pin shorts of		problem solved,
	cable that connects I/O		otherwise go to
	board DCN14 and lower		step 3.
	feed unit connector. Is
	cable okay?
3	Replace lower feed unit.	Problem solved.	Go to step 4.
	Does error clear?
4	Replace I/O board. Does	Problem solved.	Go to step 5.
	error clear?
5	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 2-59