20
DMSTetrad
Troubleshooting
Problem
Possible cause
Remedy
No radio contact, the status LED (15) on the
transmitter is flashing green.
The connected transmitters switch off
automatically after two minutes without
radio contact with the receiver.
The receiver is switched off, there is a power
failure, the transmitter is out of range, or a
transmitter is not registered.
Set up the receiver. Make sure the transmitter is
in range of the transmitter.
No sound
No sound because dual channel usage is not
permitted. Status LED (15) of the transmitter
flashes green, because another transmitter is
active on the same channel on the receiver.
Channel identification is not possible if
transmitter is not connected.
Switch off the transmitter which is not outputting
an audio signal and assign this transmitter to a
free channel on the receiver.
AC adapter is not connected to receiver and/or
power outlet.
Connect AC adapter to receiver and/or power
outlet.
Receiver is OFF.
Switch on receiver using the On/Off button (1).
Receiver is not connected to mixer or amplifier. Connect receiver output to mixer or amplifier
input.
VOLUME potentiometer (2) on receiver is at zero. Turn up VOLUME potentiometer.
Microphone or instrument is not connected to
bodypack transmitter.
Connect microphone or instrument to audio
input (21) on bodypack transmitter.
Transmitter On/Off switch (17) is set to "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 the receiver.
Move closer to the receiver.
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 is in an unsuitable position.
Move receiver to a different location. The best
transmission and reception performance is
achieved when the antennas (7) are pointing
upwards in the "normal position" (see image on
the cover page).
Interference from other wireless systems, TV,
radio, mobile phone, walkie-talkies, or defective
electrical appliances or installations.
Increase the internal interference protection by
adjusting the INTERFERENCE PROTECTION
switch to the "MID" or "HIGH" setting.
Switch off interfering appliances within the 2.4
GHz ISM frequency range; switch off defective
appliances; have electrical installations checked.
Distortion
GAIN control (19 / 25) is set too high or too low. Turn GAIN control up or down until distortion
goes away.
Interference from other wireless systems, TV,
radio, mobile phone, walkie-talkies, or defective
electrical appliances or installations.
Increase the internal error correction by
adjusting the INTERFERENCE PROTECTION
switch to the "MID" or "HIGH" setting.
Switch off interfering appliances within the 2.4
GHz ISM frequency range; switch off defective
appliances; have electrical installations checked.
Antenna position.
Move receiver to a different location. If dead
spots persist, mark and avoid them.
7
Troubleshooting