17
915-BL Dual Frequency Doppler
Maintenance and Service
Troubleshooting Guide
This table lists common problems and suggestions for troubleshooting them. If a problem persists after
these actions have been taken, contact Parks Medical Electronics, Inc.
Problem
Situation
Suggested Actions
1.0
Doppler unit
doesn’t turn on
1.1
The power control
knob is on but the battery
indicator lamp does not light
up
Disconnect the
•
battery charger
Replace
•
fuse (See Maintenance)
Replace
•
battery if > 3 years old
(See Maintenance)
1.2
The power control
knob is on and the battery
indicator lamp lights up
Listen with headphones
If there is sound with the headphones but not the
speakers, go to 3.2.1
2.0
Battery is not
charging
2.1
Battery CHARGER
lamp does not light up when
Doppler is turned off and
charger is connected
Replace the battery charger
See Speci
fi
cations and Replacement Parts
2.2
Battery CHARGER lamp
lights up when connected to
charger with Doppler off.
Battery INDICATOR lamp
blinks with Doppler on
and charger disconnected
after charging for at least 8
hours.
See Routine Maintenance
Replace the battery
See Speci
fi
cations and Replacement Parts
3.0
Hard to hear
blood sounds (poor
signal : noise ratio)
3.1
Too much noise
3.1.1
Prevent feedback (screeching sound):
Keep the
•
probe against the skin once gel is
applied.
Keep the
•
probe out of line with the sound
waves from the speaker.
Keep probe
•
cable from looping around and
touching itself.
3.1.2
Check for a noisy circuit:
Disconnect the probe and turn the Doppler unit
1.
on.
Turn the volume all the way up.
2.
You should hear smooth white noise or hissing
3.
like the noise of wind or surf.
It may be loud, but it must be smooth.
If you hear crackling or sputtering, the circuit is
4.
noisy. Call technical support.
3.1.3
Check for a microphonic circuit:
Tap or drum on panel and case with your
1.
fi
ngers. You should hear a dull thud.
If you hear a ringing noise, the circuit may be
2.
microphonic. This makes it prone to scream
whenever there is gel on the probe. Call
technical support.
Summary of Contents for 915-BL
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