Parks 915-BL, Operating & Service Manual

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18
Parks Medical Electronics, Inc.
Aloha, Oregon U.S.A.
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
(continued)
3.0
Hard to hear
blood sounds (poor
signal: noise ratio)
(continued)
3.1
Too much noise
3.1.4
Check for noisy probe:
Clean and dry the crystal end of the probe. 1.
Connect the dry probe to the Doppler unit, turn 2.
the Doppler unit on, and turn the volume up.
Wiggle the probe plugs. 3.
If you hear a crackling sound, the connection
is noisy.
Clean and tighten the probe plugs: 4.
Wipe the pin in the center of the plug and •
the fl ange around it with contact cleaner or
isopropyl alcohol.
Squeeze the
fl ange with your fi ngers (or •
gently with pliers). Make the fl ange form
a smaller circle so that it grips the jacks on
the Doppler panel more tightly.
Check for noise again. 5.
If there is still noise, bend the cable here: 6.
Send the cable back to the factory for new
plugs if the noise originates here.
Flex the cable near the crystals. If the cable
7.
is noisy near the transducer, it cannot be
repaired. Replace probe.
Press gently on each 8. crystal with your fi ngernail.
If a crackling or popping sound occurs, the
probe cannot be repaired. Replace probe.
3.1.5 Check for electromagnetic interference:
Noise that is probably caused by an
electromagnetic
fi eld:
a tone or whistle that does not change pitch •
a buzz or a hum •
a noise like a radio station •
a ticking sound that seems periodic •
Con fi rmation criteria:
The noise worsens when the probe is held or •
applied to the patient.
The noise disappears when the Doppler unit is •
used at another site
Possibly if the noise lessens when the probe is •
disconnected