23
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
Installer Guide
)
• 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
Installer Guide
)
• 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 Microphone A or B Volume control(s)
on 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 Microphone A or B Volume
control(s) on the receiver, or audio device
• 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
15
Troubleshooting
