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2-22 Service Manual
24xx
Paper Present Sensor Service Check
FRU Action
1 Paper Present
Sensor
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.
2 Logic Board 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.