4-56 250 Series Maternal/Fetal Monitor Revision D
2020551-001
Maintenance: Recorder Photosensor Calibration
Adjusting the Paper-Loading Sensor
1. Load paper in the recorder. Ensure that there are no black squares showing to
indicate a paper-low condition. You must load at least nine sheets of paper.
2. Using a digital voltmeter, connect the positive lead to J9 (pin 6) on the Recorder
Board; connect the negative lead to J9 (pin 2).
3. Adjust R41 for a reading of +190 mVdc ± 5 mVdc on the digital voltmeter.
4. Although a factory-only fixture is required for this step, you may wish to try it
by estimating the required distance. Load paper backwards with the white
surface 0.380 in away from the paper tray. This creates a paper-loading error
condition. Verify that the voltage at J9 (pin 6) on the Recorder Board is at least
2.70 Vdc.
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