Lexmark 5021-0XX manual Cover open service check

			5021-0XX
Cover open service check
Step	Questions / actions	Yes	No
1	Turn printer off and remove	Go to step 2.	Replace
	right cover. See “Right		appropriate
	cover removal” on		actuator:
	page 4-22. Check all		Front cover for
	interlock switch (top, rear
			front cover
	and front) actuators for
			interlock switch.
	proper operation. Are
			See “Front
	actuators good?
			cover assembly
			removal” on
			page 4-19.
			Top cover
			assembly for top
			cover interlock
			switch. See
			“Top cover
			assembly
			removal” on
			page 4-18.
			Rear cover
			actuator for rear
			cover interlock
			switch. Actuator
			is contained in
			parts packet.
2	Check each interlock	Go to step 3.	Replace switch
	switches (top, rear and		in question. See
	front) for proper operation		“Front door
	and damage. Listen for		interlock switch
	switching action. Using an		removal” on
	ohmmeter, check switches.		page 4-29for
	When switch is open (cover		front interlock
	open), resistance between		switch, see
	pin 1 and pin 3 is 0 and pin		“Power supply
	1 and 2 is infinite. Closing		fan removal” on
	switch will show 0		page 4-74for
	resistance between pins 1		rear and top
	and 2 and infinite		interlock
	resistance between pins 1		switches.
	and 3. Are switches good?

Diagnostic information 2-75