Lexmark 5021-0XX manual Toner low/empty service check, Sensor sender, 4-35and, 4-64for

5021-0XX

Toner low/empty 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
	DCN15?
2	Reconnect operator panel.	Go to step 3.	Check cable for
	Turn printer on. Touch		continuity
	negative lead of voltmeter		between I/O
	to metal bracket that holds		board DCN15
	I/O board to obtain ground.
			and toner sensor
	Touch positive lead to
			system (both
	DCN15 pin 1, 2, 3, or 4 for
			sender and
	specific color as dictated by
			receiver). Also
	list below:
			check for
	DCN15
			shorted pins.
	pin1— black(K)
			See “Toner
	pin2— yellow(Y)
			sensor (sender)
	pin3— magenta(M)
			removal” on
	pin4— cyan(C)
			page 4-35and
	Slightly remove toner
			“Toner sensor
	cartridge in question.
			(receiver)
	Voltmeter should read
			removal” on
	approximately 4.8 VDC.
			page 4-64for
	Continue to slowly slide
			steps to expose
	toner cartridge out of
	printer while noting		cable. If cable is
	voltmeter reading. Voltage		okay, replace
	should slowly decrease		toner sensor
	until it reads approximately		system.
	0 VDC. Is toner sensor
	system working properly?
3	Replace I/O board.	Problem solved.	Replace engine
	See “I/O board removal”		controller board.
	on page 4-70. Does error		See “Engine
	clear?		controller
			board removal”
			on page 4-55.

2-92Service Manual