Sennheiser HD 4.50 BTNC Owner's Manual

HD 4.50BTNC

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Troubleshooting

Problem

Possible cause

Possible solution

Page

Headphones
cannot be
switched on

Battery is empty

Charge the headphones

Battery is completely
exhausted/worn out

Visit an authorized
Sennheiser service center
for battery replacement

No audio signal Headphones are not

paired with your device

Check if the headphones
are paired. If necessary,
pair the headphones with
the device again

Volume too low

Increase the volume

Headphones are
switched off

Switch the headphones on

Headphones
cannot connect

Pairing does not work

Check if your smartphone
supports the HFP or HSP
Bluetooth profile

Smartphone is
switched off

Switch your smartphone
on

Bluetooth is
deactivated on your
smartphone

Activate

Bluetooth on your

smartphone

Headphones
do not respond
to any button
press

Headphones are not
functioning properly

Restart the headphones by
switching them off and on
again.

No audio signal Headphones are not

paired with your device

Check if the headphones
are paired. If necessary,
pair the headphones with
the device again

Volume too low

Increase the volume

Headphones are
switched off

Switch the headphones on

Headphones
do not
automatically
go to pairing
mode

Headphones must have
been paired previously
to some devices

Switch the headphones
off and press the power
button for 4 seconds

If you encounter a problem that is not listed in the table, or if the solutions
provided do not work, please contact an authorized Sennheiser service partner
for assistance.

To find a Sennheiser service partner in your country, visit www.sennheiser.com.