32
WMS420
Troubleshooting
Problem
Possible cause
Remedy
No sound
AC adapter is not connected to receiver
and/or power outlet.
Connect AC adapter to receiver and/or power
outlet.
Receiver is OFF.
Push ON/OFF switch to switch receiver ON.
Receiver is not connected to mixer or
amplifier.
Connect receiver output to mixer or amplifier
input.
VOLUME control on receiver is at zero.
Turn up VOLUME control.
Microphone or instrument is not connected to
pocket transmitter.
Connect microphone or instrument to audio
input on the pocket transmitter.
Transmitter has a different frequency range or
is tuned to a different frequency from the
receiver.
Use a transmitter with the same frequency
range as the receiver or tune both to the
same frequency.
Transmitter on/off switch is at "OFF" or
"MUTE".
Set transmitter on/off switch to "ON".
Transmitter batteries are not inserted
properly.
Insert batteries conforming to "+" and "-"
marks.
Transmitter batteries are flat.
Replace transmitter batteries.
Transmitter is too far away from receiver or
squelch level set too high.
Move closer to receiver or reduce squelch
level.
Obstructions between transmitter and
receiver.
Remove obstructions.
No line of sight between transmitter and
receiver.
Avoid spots where you cannot see receiver.
Receiver is too close to metal objects.
Remove interfering objects or move receiver
away from them.
Noise, crackling, unwanted signals
Antenna position.
Move receiver to a different location.
Interference from other wireless systems, TV,
radio, walkie-talkies, or defective electrical
appliances or installations.
Switch off interference sources or defective
appliances or use a WMS420 tuned to a
different frequency; have electrical installation
checked.
Distortion
GAIN control is set too high or too low.
Turn GAIN control up or down until distortion
goes away.
Interference from other wireless systems, TV,
radio, walkie-talkies, or defective electrical
appliances or installations.
Switch off interference sources or defective
appliances or use a WMS420 tuned to a
different frequency; have electrical installation
checked.
Antenna position.
Move receiver to a different location. If dead
spots persist, mark and avoid them.
6
Troubleshooting
