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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 No mains connection 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” on page 21) or
reduce the distance between
transmitter and receiving antenna
RF signal available,
no audio signal,
“MUTE” display appears on the
display panel
Transmitter is muted (“MUTE”) Deactivate the muting function
(see operating manual of the
transmitter)
Receiver’s squelch threshold is
adjusted too high
See “Adjusting the squelch
threshold” on page 21
Transmitter doesn’t transmit a
pilot tone
Switch the pilot tone transmission
on the transmitter on or
switch the pilot tone evaluation on
the receiver off
Transmitter sensitivity is adjusted
too low
Adjust the transmitter sensitivity
correctly
Audio signal has a high level of
background noise
Receiver’s AF output level is
adjusted too low
See “Adjusting the audio output
level” on page 21
Transmitter sensitivity is adjusted
too high
Adjust the transmitter sensitivity
correctly
Audio signal is distorted Receiver’s AF output level is
adjusted too high
See “Adjusting the audio output
level” on page 21
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” on page 19
During scanning, a transmitter of
your system operating on this
channel has not been switched off
See “Multi-channel operation” on
page 20
During the soundcheck, only one
diversity display (I or II) appears on
the display panel
One of the antennas is not
connected correctly
Check the antenna connections