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If a problem occurs ...
Error checklist
If a problem occurs that is not listed in the above table or if the problem 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
Transmission range is exceeded Check the squelch threshold setting
(see “Adjusting the squelch
threshold (receiver only)” on
page 29)
or reduce the distance between
transmitting antenna and receiver
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 29)
Audio signal has a high level
of background noise
Transmitter sensitivity is adjusted
too low
See “Adjusting the sensitivity
(transmitter only)” on page 30
Audio signal is distorted Transmitter sensitivity is adjusted
too high
See “Adjusting the sensitivity
(transmitter only)” on page 30
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 28
ew300_350_IEM_INT.book Seite 34 Freitag, 7. März 2008 8:55 08