Beyerdynamic UHF Wireless System Opus 900 User Manual

• Power supply is interrupted, power 

supply unit is not connected to the mains 
and / or to receiver

• Connect the receiver to AC power

• Switch on the transmitter
• Adjust the correct frequency with the

ACT function

• Check the antenna cables

• Input amplifier of the connected mixer is

overloaded

• Use the gain control of the mixer or 

adjust the volume

Distorted sound

No reception

No function

• Transmitter is not switched on
• Transmitter works on a different 

channel

• Defect in the antenna cables with 

remote antennae

“CLIP” indication on
receiver

• Transmitter is overloaded

• Reduce the sensitivity of the 

transmitter or increase the distance 
between microphone and sound 
source.

No sound, RF-indication is
okay, AF- indication is
missing during 
modulation

• Wrong indication caused by strong 

interference signals

• No microphone connected to TS 900 

beltpack transmitter

• Choose another receiving channel

• Connect a suitable microphone

• Transmitter and receiver have different 

frequencies

• Insufficient battery voltage

• Poor battery contact, battery inserted 

incorrectly

• Check if transmitter and receiver 

have the same frequency

• Replace the batteries or recharge 

them, if you use rechargeable 
batteries

• Check the battery and insert it again

• Transmission distance between transmitter

and receiver is too big

• Reduce the distance between 

transmitter and receiver

No RF-indication at the
receiver

• Interference from other transmitters
• Two transmitters are on the same 

frequency

• Battery of the transmitter is too weak

• Switch off the other transmitters
• Change the frequency of one 

transmitter

• Replace the batteries

Noise/chirping

No function