Sound can only be heard from one earphone
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The signal may not be coming in clearly, making the connection unstable.
Move away from wireless devices such as Wi-Fi access points, or appliances that product
electromagnetic waves such as microwave ovens.
After placing both earphones into the charging case, take them out again.
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You may be using a smartphone app that generates sound from only one channel.
Check whether you can hear sound coming from both left and right channels by playing back sound from
a different app.
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One of the earphones might be turned off.
Turn the power on.
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The connection information for the registered Bluetooth device may not be working properly.
Delete the connection information for that Bluetooth device, and then pair the earphones with the
device.
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“Registering a Bluetooth device (pairing)” (p.19)
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Troubleshooting > Sound can only be heard from one earphone