Philips Avalon CTS M2720A, Service Manual

Page: 80 / 110

7 Troubleshooting Testing Transducers
74
If the test results are not as outlined above, repeat the tests with another transducer. If this does not solve
the problem:
• Check that the base station is properly connected to the fetal monitor.
• There is likely to be a RF-related problem. Check for frequent mode annotations on the fetal monitor’s
recorder to confirm this. Refer to the information on RF troubleshooting in this chapter, and to the
chapter “Troubleshooting” in the
Instructions for Use .
If the problem persists, replace the transducer.
The transducers are sealed and are NOT repairable.
TOCO Transducer Electrical Check
1 Register the transducer to the base station following the brown color coding, so that it displays a bed
label and has an active RF link (see the
Instructions for Use for details).
Ensure that:
– the Toco numeric on the fetal monitor shows 20.
– when the recorder is switched on, the date, time, mode and paper speed are printed on the recorder
trace.
2 Press the transducer’s Toco sensor firmly and look for a deflection on the display and recorder. The
external Toco display maximum is 127 units.
3 Lay the transducer face up on a hard, flat surface for a few seconds, so that the belt button and the take-
out aid end of the transducer make contact with the surface (see Figure 7 on page 74).
4 Press the Toco Baseline Key to re-adjust the Toco display to 20.
5 T urn the transducer over so that the Toco sensor is resting on the flat surface. The transducer will
always adopt the same, slightly inclined position, with the take-out aid end of the transducer also
resting on the surface (see Figure 7).
You should see a marked increase in the value of the Toco numeric on the fetal monitor.
Figure 7 Checking a Toco Transducer
If the test results are not as outlined above, repeat the test with another Toco transducer. If this does not
solve the problem:
• Check that the base station is properly connected to the fetal monitor.
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