Troubleshooting

7 Troubleshooting

Problem

Possible cause

Remedy

No radio contact, the status LED (13) on the

The receiver is switched off, there is a power

Set up the receiver. Make sure the transmitter

transmitter is flashing green.

failure, the transmitter is out of range, or a

is in range of the transmitter.

The connected transmitters switch off

new transmitter is not registered.

 

automatically after two minutes without radio

 

 

contact with the receiver.

 

 

 

No sound because dual channel usage is not

Switch off the transmitter which is not

 

permitted. Status LED (13) of the transmitter

outputting an audio signal and assign this

 

flashes green, because another transmitter is

transmitter to a free channel on the receiver.

 

active on the same channel on the receiver.

 

 

Channel identification is not possible if

 

 

transmitter is not connected.

 

 

AC adapter is not connected to receiver

Connect AC adapter to receiver and/or power

 

and/or power outlet.

outlet.

 

 

 

 

Receiver is OFF.

Switch on receiver using on/off button (1).

 

Receiver is not connected to mixer or

Connect receiver output to mixer or amplifier

 

amplifier.

input.

 

VOLUME potentiometer (2) on receiver is at

Turn up VOLUME potentiometer

 

zero.

 

No sound

Microphone or instrument is not connected to

Connect microphone or instrument to audio

bodypack transmitter.

input (19) on bodypack.

 

 

Transmitter on/off switch (15) is set to "OFF"

Set transmitter on/off switch to "ON".

 

or "MUTE".

 

 

Transmitter batteries are not inserted

Insert batteries conforming to "+" and "-"

 

properly.

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

Remove obstructions.

 

receiver.

 

 

No line of sight between transmitter and

Avoid spots where you cannot see receiver.

 

receiver.

 

 

Receiver is too close to metal objects.

Remove interfering objects or move receiver

 

 

away from them.

 

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

 

 

diagram on the title page).

Noise, crackling, unwanted signals

Interference from other wireless systems, TV,

Increase the internal error correction by

radio, mobile phone, walkie-talkies, or

adjusting the AUTO CORRECTION switch to

 

 

defective electrical appliances or installations.

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.

 

GAIN control (17 / 23) is set too high or too

Turn GAIN control up or down until distortion

 

low.

goes away.

 

Interference from other wireless systems, TV,

Increase the internal error correction by

 

radio, mobile phone, walkie-talkies, or

adjusting the AUTO CORRECTION switch to

 

defective electrical appliances or installations.

the "Mid" or "High" setting.

Distortion

 

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.

40

DMS 70 Quattro/Dual

Page 40
Image 40
Harman DMS70 manual Troubleshooting