24
Receiver won’t turn on (power light
doesn’t turn on)
• Verify that the power supply is plugged into
both the receiver and a working wall outlet.
’Dead spots’ or microphone crackling/
noise
• Verify that you are not blocking either the
emitters on the microphone or the sensors
mounted around the room.
• If reception is interrupted or noisy when facing
a certain direction, install an additional sensor
in that area of the room (see
pages 9-13
).
• If using more than one microphone, verify
that they are not on the same channel.
• Recharge or replace the microphone batteries.
No signal reception (channel indicator
light on receiver is red)
• Check that the microphone is on.
• Check that the microphone is not muted
(940TM only).
• Verify that you are not blocking either the
emitters on the microphone or the sensors
mounted around the room.
• If reception is interrupted when facing a
certain direction, install an additional sensor
in that area of the room (see
pages 9-13
).
• If using more than one microphone, verify
that they are not on the same channel.
• Recharge or replace the microphone batteries.
Feedback (squealing)
• Lower the gain for the mic channel on the
amplifer (not the receiver).
• Make sure that speakers are mounted as close
as possible to the ceiling and to the listening
area; avoid mounting speakers in the teacher’s
primary lecture area.
• Position the microphone closer to mouth.
Weak or no output from speaker(s)
• Increase the Mic Channel Gain on the
amplifier (not the receiver).
• Position the microphone closer to mouth.
• Verify that the speakers have been properly
installed.
High or low pitched whine or hum
coming through speakers
• There may be a ground loop with the
system. Install a ground loop isolator on the
audio output.
• There may be "noisy" electrical wiring.
Install an AC line filter.
Distorted/gurgling/buzzing
• Microphones are on same channel. If you are
using two microphones, set one to
channel A and the other to channel B.
10
Troubleshooting
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