If a problem occurs ...
MM 400-X
| 21
If a problem occurs ...
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
Sennheiser partner for assistance.
To find a Sennheiser partner in your country, search at
www.sennheiser.com.
Problem
Possible cause
Solution
Page
No operation
indicator –
headset
cannot be
switched on
The battery pack
is flat.
Recharge the battery pack.
8
No audio
signal when
the audio cable
is connected
The jack plug of
the audio cable
is not properly
connected.
Check the connection to
your audio source.
13
No audio
signal during
Bluetooth
connection
The headset is
switched off.
Switch the headset on.
14
The headset is not
paired with an
audio source.
Check if the headset is
paired. If necessary, pair
the headset with the audio
source again.
12
The
Bluetooth
function on
the headset is
switched off.
Switch the
Bluetooth
func-
tion on the headset on.
15
The audio cable is
connected to the
headset.
The connection of the
audio cable automatically
switches off the
Bluetooth
connection. Remove the
audio cable and then switch
the
Bluetooth
function on
again.
13
The volume is
adjusted too low.
Increase the volume.
15
Headset
cannot be
paired
The pairing does
not work.
Check if the audio source
supports the A2DP profile.
If not, use one of the
optional dongles.
–
The audio source
is switched off.
Switch the audio source on.
11
Headset do not
react to any
button press
The operation of
the headset is
faulty.
Remove the battery pack
from the headset. Reinsert
the battery pack into the
headset. Switch the headset
on again.
–
Bluetooth
connection is
suddenly
interrupted
The
Bluetooth
button has been
pressed too long.
Switch the
Bluetooth
func-
tion on.
15
