Philips Avalon CTS M2720A Service Manual page 79

Testing Transducers
The ultrasound transducer contains seven piezoelectric crystals. Basic functioning of each can be verified
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by holding a flat bottomed pencil or similar above each crystal and moving it up and down as shown.
A sound should be heard for each crystal tested. The pencil should be held two to three centimeters from
the transducer surface when the test is carried out.
A sound should also be heard when the transducer is moved back and forth over a solid surface, or the
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hand as shown below.
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Figure 4 Testing an Ultrasound Transducer Using a Pencil
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Figure 5 Position of Crystals in an Ultrasound Transducer
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Figure 6 Checking an Ultrasound Transducer
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7 Troubleshooting
Crystals
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