Lexmark 248X-200 series, Service Manual

Page: 42 / 172

2-24
Service Manual
24XX-200
4 Operator panel If paper does not move at all, verify that the
Load/Unload button is working as follows:
With the tractor in the push position, turn the
power off and then back 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
sensor 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.
7 Pull Tractor
sensor If the pull tractor sensor fails to close,
Load/Unload and Auto Tear Off do not work
when using push tractors.
The sensor fails to open. The Load/Unload
button tries to park paper when using the pull
tractors, but, instead, the paper feeds all of the
way out of the tractors and cannot be reloaded.
See
“Pull Tractor sensor service check” on
page 2-32 .
FRU/symptom Action