Lexmark 5021-0XX manual Transfer roller clutch service check, Clutch, On page 4-70. If

			5021-0XX
991—Transfer roller clutch service check
Step	Questions / actions	Yes	No
1	Turn printer off and remove	Go to step 2.	Replace faulty
	printer right cover. See		transfer roller
	“Right cover removal” on		clutch. See
	page 4-22. Disconnect		“Clutch
	transfer roller clutch from		removal” on
	cable. Measure resistance		page 4-40.
	between two outer pins on
	transfer roller clutch. Does
	resistance measure
	between 119 and 145
	ohms?
2	Remove I/O board shield.	Replace I/O	Go to step 3.
	See “I/O board removal”	board. See “I/O
	on page 4-70for steps to	board removal”
	remove I/O board shield.	on page 4-70. If
	Disconnect cable from	problem
	DCN10 on I/O board.	persists, go to
	Check cable continuity from	step 3.
	DCN10 pins 7 and 8
	(cable) to connector that
	attaches to transfer roller
	clutch. Ensure that pins are
	not shorted. Is cable okay?
3	Remove engine controller	Replace engine	Replace cable.
	board shield. See “Engine	controller board.
	controller board removal”	See “Engine
	on page 4-55for steps to	controller
	remove shield. Check cable	board removal”
	that connects I2CN on	on page 4-55.
	engine controller board to
	DCN3 on I/O board for
	proper connection,
	damage, pin shorting and
	continuity. Is cable okay?

Diagnostic information 2-67