If A Problem Occurs; Troubleshooting - Sennheiser MM 400 Instruction Manual

If a problem occurs ...

22
If a problem occurs ...
Problem Possible cause
No operation The battery pack is flat.
indicator –
headset cannot
be switched on
No audio signal The jack plug of the
when the audio audio cable is not
cable is properly connected.
connected
No audio signal The headset is switched
during Bluetooth off.
connection
The headset is not
paired with an audio
source.
The Bluetooth function
on the headset is
switched off.
The audio cable is
connected to the
headset.
The volume is adjusted
too low.
Headset cannot The pairing does not
be paired work.
The audio source is
switched off.
Headset does The operation of the
not react to any headset is faulty.
button press
Bluetooth The Bluetooth button
connection is has been pressed too
suddenly long.
interrupted
Solution
Recharge the battery pack
(see page 8).
Check the connection to your
audio source (see page 15).
Switch the headset on
(see page 11).
Check if the headset is paired.
If necessary, pair the headset
with the audio source again
(see page 13).
Switch the Bluetooth function
on the headset on (see page 16).
The connection of the audio cable
automatically switches off the
Bluetooth connection. Remove the
audio cable and then switch the
Bluetooth function on again
(see page 16).
Increase the volume
(see page 16).
Check if the audio source supports
the A2DP profile.
If not, use one of the optional
dongles.
Switch the audio source on
(see page 12).
Remove the battery pack
from the headset. Reinsert the
battery pack into the headset.
Switch the headset on again.
Switch the Bluetooth function on
(see page 16).