Lexmark Forms Printer 2400 Service Manual page 42

24xx
FRU / Symptom
4 Operator Panel
5 Paper Feed Motor
6 Paper Select
Sensor
7 Pull Tractor
Sensor
8 Logic Board
2-24
Service Manual
Action
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
Check" on page
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.
Remove all paper from the printer and place
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.
If the pull tractor sensor fails to close,
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
Service Check" on page
If no other problem is found, replace the logic
board and reset the
Adjustment" on page
"Operator Panel Service
2-21.
"Pull Tractor Sensor
2-31.
"Bidirectional Print
4-4.