Oki 2400 manual If it does not, go to Operator Panel Service

24xx

	FRU / Symptom	Action
4	Operator Panel	If paper does not move at all, verify the
		Load/Unload button is working as follows:
		With the tractor in the push position, power off,
		power on and then press Load/Unload. The
		carrier should move to the center of the platen.
		If it does not, go to “Operator Panel Service
		Check” on page 2-21.
5	Paper Feed Motor	Disconnect the paper feed motor cable CN1
		from the logic board. No pin should have
		continuity to ground. The resistance should be
		between 8 to 9 ohms, between CN10 - 1 and
		CN10 - 5, CN10 - 2 and CN10 - 5, CN10 - 3
		and CN10 - 5, CN10 - 4 and CN10 - 5.
6	Paper Select	Remove all paper from the printer and place
	Sensor	the tractor in the push position.
		Press FormFeed and time how long the gear
		train rotates.
		•	With the paper select lever in the cut sheet
			position (sensor open) the gear train should
			rotate for less than 2 seconds.
		•	With the lever in the continuous forms
			position (sensor closed), the gear train
			should rotate for more than 3 seconds.
		If the printer does not do either of the above:
		• Inspect the sensor to be sure it opens and
			closes by the paper separator.
		• Replace the sensor if the resistance does
			not change from zero to infinite as the paper
			select lever is moved.
7	Pull Tractor	If the pull tractor sensor fails to close,
	Sensor	Load/Unload and Auto Tear Off do not work
		when using push tractors.
		If the sensor fails to open, Load/Unload tries
		to park paper when using pull tractors, but the
		paper feeds all the way out of the tractors and
		cannot reload. See “Pull Tractor Sensor
		Service Check” on page 2-31.
8	Logic Board	If no other problem is found, replace the logic
		board and reset the “Bidirectional Print
		Adjustment” on page 4-4.

2-24Service Manual