Paper Empty Sensor Service Check - Lexmark 2380 - Forms Printer B/W Dot-matrix Service Manual

Paper Empty Sensor Service Check

Note: 23XX-001 machines have a single paper sensor that serves
as a paper empty sensor and also determines the top of form
setting.
23XX-002 and 23XX-003 machines have two sensors:
•
The left sensor is paper empty.
•
The right sensor is Top of Form.
FRU
1 Paper Empty
Sensor
2 Main Logic Board
2-26
Action
With no paper in the printer, the tractor in the
push position, and the paper select lever set to
continuous forms, press Alt+Park/Load; the
gear train should turn forward (to try to load
paper).
Activate the paper empty sensor with a
screwdriver and press Alt+Park/Load again;
the gear train should turn backward (to try to
park paper).
Measure the voltage between CN7-2 (paper
empty signal) and CN7-3 (GND) on the main
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.
Make sure the sensor and its actuator are
properly installed and undamaged. Correct the
problem or replace the 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.
• Make sure the ASF setting is off unless
the ASF is installed.
• If the sensor and the ASF setting are OK,
replace the main logic board.
• Reset the "Bidirectional Print Adjustment"
on page 4-5.