Paper Present Sensor Service Check - Lexmark Forms Printer 2400 Service Manual

24xx

Paper Present Sensor Service Check

FRU
1 Paper Present
Sensor
2 Logic Board
2-22
Service Manual
Action
With no paper in the printer, the tractor in the
push position, and the paper select lever set to
continuous forms, press Load/Unload; the
gear train should turn forward to load paper.
Activate the paper present sensor with a
screwdriver and press Load/Unload again; the
gear train should turn backward to park paper.
Measure the voltage between CN5-2 (paper
present signal) and CN5-3 (GND) on the logic
board. There should be 0 V dc when there is
paper in the printer, and +5 V dc when there is
no paper in the printer.
• Be sure the paper present sensor and its
actuator are properly installed and not
damaged.
• If the problem remains, replace the paper
present sensor.
If the ASF is being used, it is normal for the
paper out LED not to blink when there is no
paper in the printer. Do the following:
• Enter the Setup Menu.
• Be sure the ASF setting is off unless the
ASF is installed.
• If the paper present sensor is good and the
ASF setting is on, replace the logic board
and reset the "Bidirectional Print
Adjustment" on page 4-4.