Instruction manual

If a problem occurs ...
18 | SK 9000
If a problem occurs ...
Problem Possible cause Possible solution
Transmitter
cannot be oper-
ated, “LOCK”
appears on the
display panel
Lock mode is
activated
Deactivate the lock mode.
No operation
indication
Batteries are flat
or accupack is flat
Replace the batteries or
recharge the accupack
(see page 8
).
No RF signal at
the receiver
Transmitter and
receiver are not
on the same
frequency
Transmitter to the same
frequency as the receiver.
Transmission
range is exceeded
Reduce the distance
between transmitter and
receiving antennas.
Transmitter’s 
RF signal is
deactivated 
(“RF Mute”)
Activate the RF signal.
Audio signal has
a high level of
background
noise or is
distorted
Transmitter input
gain is adjusted
too low/too high
Adjust the input gain 
(see page 15).
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 partner for assistance.
To find a Sennheiser partner in your country, search at 
www.sennheiser.com under “Service & Support”.