Philips Avalon FM20, Service Manual

Page: 93 / 260

7 Testing and Maintenance
93
Toco Transducer Electrical Check
To test a Toco transducer:
1
Switch on the monitor and the recorder.
2
Connect the transducer to the fetal monitor.
3
Lay the transducer face up on a hard, flat surface for a few seconds.
4 Press the Toco Baseline Key to re-adjust the Toco display to 20±1.
5
Turn the transducer over so that the Toco sensor is resting on the flat surface. You should see a
marked increase in the value of the Toco reading in the Toco display.
6
Press the Toco Baseline Key to re-adjust the Toco display to 20±1.
7
Turn the transducer over again. You should see a marked decrease in the value of the Toco reading
in the Toco display
Testing the Patient Module (M2738A)/Toco+ Transducer (M2735A): DECG Mode
1
Switch on the monitor and the recorder.
2 Connect the patient module or Toco
+
transducer to the fetal monitor.
3
Attach the DECG adapter cable M1362B to the socket on the patient module or Toco
+
transducer.
Ensure that the DFHR channel display on the fetal monitor shows the
DFHRx Leads Off
INOP with
the DECG adapter cable attached.
1
Take a Fetal Scalp Electrode, and connect it to the DECG adapter cable.
2
Either:
Hold the reference electrode between the thumb and index finger of one hand, and touch the
spiral electrode with the index finger of the other hand, as illustrated below. This makes a short
between the spiral electrode and the reference electrode (it is best to wet your fingers first). Use a
sterile Fetal Scalp Electrode.