Lexmark 25**-100, Service Manual

Page: 48 / 188

2-28
Service Manual
25XX-100, -110
Paper Select sensor service check
If the form feed length is off by about 1 inch (25 mm), enter Setup
mode and verify that the form length setting is correct. Go to
“Setup
mode” on page 1-2 .
FRU Action
1 Paper Select
sensor Remove all paper from the printer, and do the
following:
• Place the tractor in the push position, and be
sure the Auto Sheet Feed (ASF) is set to off
in Setup mode.
• 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 gear train does not rotate for
more than 3 seconds:
• Inspect the sensor to be sure it opens and
closes by the paper separator.
• Replace the paper select sensor if the
resistance does not change from zero to
infinite as the Paper Select lever is moved
from cut sheet to continuous forms.
If the Paper Select sensor is good, but the gear
train does not run the right length of time:
• Set the head gap to position 1, and
disconnect the short flexible cable from CN8
on the logic board.
• Check the continuity between CN8-2 (paper
select sensor) and GND while activating the
Paper Select lever.
If the resistance is incorrect, replace the logic
board and reset the bidirectional print
adjustment. Go to
“Bidirectional print
adjustment” on page 4-4 .