Xerox 4050 NPS, 4090 NPS, 4890 NPS, 4850 NPS manual 48-23

				PRINTER CONTROLLER MESSAGES
Message			Explanation/action
F127	Clean belt readings are		The belt may need to be replaced.
	out of range 120-250.	1.		Press the Continue button.
		2.		If problem persists, notify your service representative.
F135	IOT fails to rephase in 30		The registration mechanism (rephaser and belt) will not
	belt revolutions.		allow rephasing to occur.
		1.		Press the Continue button.
		2.		If problem persists, notify your service representative.
F136	Check output -- image		A paper registration shift (actual versus optimum belt-hole
	may be off paper.		to registration-finger distance) has exceeded an NVM-
			defined millimeter limit.
		1.		Check delivered output for the image off the paper.
		2.		Press the Continue button.
F137	Excess belt holes		Too many belt holes have been detected within one belt
	detected.		revolution.
		1.		Press the Continue button.
		2.		If problem persists, notify your service representative.
F140	Dynamic Stray Check		An unexpected sheet is stopped at the stacker.
	fault, unscheduled sheet	1.		Clear the paper in the stacker.
	is detected and stopped
	at the stacker entry	2.		Discard the purged output.
	sensor.	3.		Press the Continue button.
F142	Output Tray Elevator		The tray failed to move down after three attempts.
	Fault. Stitcher/Stacker	1.		Empty the output tray.
	config.
		2.		Check for obstruction.
		3.		Press the Continue button.
		4.		If problem persists, notify your service representative.
F143	Finisher front cover		The front safety cover of the HCSS finisher is missing.
	interlock open. Stitcher/	1.		Discard the purged output.
	Stacker config.
		2.		Close the finisher from the cover.
		3.		Press the Continue button.
F153	Duplex tray (too many		A multifeed caused too many sheets to remain in the
	sheets).		duplex tray, preventing the set separator finger from
			actuating the tray empty switch once the correct number of
			sheets had been fed.
		1.		Discard unusable sheets.
		2.		Press the Continue button.
		3.		If problem persists, notify your service representative.

XEROX DOCUPRINT 4050/4090/4850/4890/92C NPS MESSAGES GUIDE 48-23