SD3 Series Ultrasonic Pocket Doppler User Manual Troubleshooting
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Appendix 5
Troubleshooting
Phenomenon
Possible Cause
Solution
The speaker does not sound.
The speaker is muted.
Turn up the volume.
Bad connection between the
probe and main unit.
Make sure that the probe is well
connected to the main unit.
Main board defective.
Replace the main board.
Speaker defective.
Replace the speaker.
Probe defective.
Replace the probe.
The speaker sounds weak.
The volume is too low.
Turn up the volume.
No coupling gel is applied.
Apply coupling gel on the probe
acoustic surface.
The battery is in low energy.
Replace the battery or charge the
rechargeable battery.
Low sensitivity.
The probe is not placed at
the optimum position.
Locate the probe at a position
for optimal FHR examining.
No coupling gel is applied.
Apply coupling gel on the probe
acoustic surface.
The screen displays nothing
and the speaker does not
sound after the main unit is
switched on.
Main board defective.
Replace the main board.
The battery is in low energy.
Replace the battery or charge the
rechargeable battery.
The speaker sounds but the
screen displays nothing or
displays wrong characters
after the main unit is
switched on.
Main board defective.
Replace the main board.
Loud noise.
The device is subject to
strong electromagnetic
emissions.
Make sure that the environment
in which the device is operated
is not subject to any source of
strong electromagnetic
emissions.
Speaker defective.
Replace the speaker.
Probe defective.
Replace the probe.
Main board defective.
Replace the main board.
The probe has not been
taken out from the probe
holder when the main unit is
switched on.
Take out the probe from the
probe holder before switching
on the main unit.
The battery is in low energy.
Replace the battery or charge the
rechargeable battery.
Too much coupling gel on
the probe acoustic surface.
Wipe the residual coupling gel
off the probe after each use.
The screen displays nothing
Power adapter defective.
Replace the power adapter.
