Sennheiser MB 660 - LED Errors and Voice Prompt Issues; NoiseGard and Audio Interruption Issues

MB 660 | 31
Troubleshooting
Troubleshooting
Problem Possible cause Possible solution Page
Headset cannot
be switched on
Battery is empty Charge the headset 14
Battery is completely exhausted/
worn out
Visit an authorized Sennheiser service center for
battery replacement
30
No audio signal Headset is not paired with the
smartphone/Bluetooth device
Check if the headset is paired. If necessary, pair the
headset with the smartphone again
14
Volume too low Increase the volume 19
Headset is in pairing mode Ensure that the headset and smartphone are paired
successfully
14
Headset cannot
connect
Bluetooth is deactivated on your
smartphone
Activate Bluetooth on your smartphone 28
Smartphone is switched off Switch your smartphone on
Pairing does not work Check if your smartphone supports the HFP or HSP
Bluetooth profile
Headset does not
respond to any
button press
Headset is not functioning properly Restart the headset by switching it off and on
again. If necessary, do a reset
33
The LED flashes
red while
connecting
The connection is not established Ensure that the distance between headset and
smartphone is less than 20 cm
Ensure that Bluetooth is activated on both the
headset and the smartphone
Smartphone
cannot detect the
headset
Bluetooth is deactivated on the
headset
Activate Bluetooth on the headset 28
Audio cable is plugged into the
audio input (the headset is in flight
mode)
Unplug the audio cable
Voice prompts
specified in
this instruction
manual cannot be
heard
Voice Prompt is deactivated in
CapTune
Activate Voice Prompt in CapTune
Headset does not
respond to Smart
Pause gestures
Smart Pause is deactivated by
factory default
Activate Smart Pause in CapTune
Smart Pause may not be compatible
with your music player
Try another music player or streaming app
Headset and
Bluetooth device
cannot connect
using Bluetooth/
NFC
Headset is switched off Ensure that the headset is switched on during
pairing
14
Device does not support NFC pairing Pair the headset and the device manually using
Bluetooth
16
Headset is in flight mode or the
audio cable is plugged into the
audio input
Activate Bluetooth on the headset and/or unplug
the audio cable from the audio input
28
Bluetooth is deactivated on the
headset
Activate Bluetooth on the headset 28
Headset does not
automatically go
to pairing mode
Bluetooth is deactivated on the
headset
Activate Bluetooth on the headset 28
Headset must have been paired
previously to some devices
Press the Sound Effect Mode button for 4 seconds 16