7-6 120 Series Maternal/Fetal Monitor Revision B
2015590-001
Calibration: Recorder Photosensor Calibration
Adjusting the Paper-Out Photosensor
1. Load paper in the recorder. Ensure that there are no black squares showing to
indicate a paper-low condition.
2. Press the
Record button to turn on the recorder. Allow the paper to advance for
a few seconds in order to tension the paper.
3. Turn off the recorder.
4. Using a digital voltmeter, connect the positive lead to J9 (pin 3) on the Recorder
Board; connect the negative lead to J9 (pin 2).
5. Adjust R29 for a reading of +150 mVdc ± 2 mVdc on the digital voltmeter.
NOTE: If you open and then close the recorder door, the reading may vary 5–10
mV, due to the loss of tension in the paper. This is acceptable and you do
not need to re-adjust.
6. Open the door and verify that the reading on the digital voltmeter is greater than
+4.75 Vdc.
7. Turn off the recorder.
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.
To Next Page
Loading...
Need help?
General
