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Troubleshooting
Error checklist
If problems occur that are not listed in the above table or if the problems cannot be solved with the proposed
solutions, please contact your local Sennheiser agent for assistance.
Problem Possible cause Possible solution
No operation indication Batteries are flat or
accupack is flat (receiver only)
Replace the batteries or
recharge the accupack
No mains connection (transmitter
only)
Check the connections of the mains
unit
No RF signal Transmitter and receiver are not on
the same channel
Set transmitter and receiver to the
same channel
Transmitter is out of range Check the squelch threshold setting
(see “Adjusting the squelch threshold
(receiver only)” on page 63) or
reduce the distance between
transmitter and receiving antenna
RF signal available, no audio
signal, “MUTE” display
appears on the display panel
Transmitter is set to mono operation
and the pilot tone evaluation of the
receiver is activated
Deactivate the pilot tone evaluation
on the receiver
Receiver’s squelch threshold is
adjusted too high
See “Adjusting the squelch threshold
(receiver only)” on page 63)
Audio signal has a high level
of background noise
Transmitter sensitivity is adjusted
too low
See “Adjusting the sensitivity
(transmitter only)” on page 64
Audio signal is distorted Transmitter sensitivity is adjusted
too high
See “Adjusting the sensitivity
(transmitter only)” on page 64
No access to a certain channel During scanning, an RF signal has
been detected on this channel and
the channel has been locked
See “Scanning the channel banks for
free channels (receiver only)” on
page 62