Yamaha YH-L700A Noise-Canceling Wireless Over-Ear Headphones - Manual (Page 38)

Cannot connect to a Bluetooth device
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This product and your Bluetooth device may be too far apart.
Move this product closer to the Bluetooth device.
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A device that emits electromagnetic waves (such as a microwave oven, access point and so on)
might be nearby.
Do not use this product near other devices that emit electromagnetic waves.
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The connection information for the registered Bluetooth device may not be working properly.
Delete the connection information of this product from the Bluetooth device, and then pair this product
with the device.
(
“Registering a Bluetooth device (pairing)” (p.16)
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The registration information for the Bluetooth device that was registered on this product may
have been deleted.
Pair this product once more.
(
“Registering a Bluetooth device (pairing)” (p.16)
(
This product may already be connected to another Bluetooth device.
Disconnect that Bluetooth device, and then connect this product with the new device.
(
The 3.5 mm stereo mini-plug cable may be connected.
Remove the 3.5 mm stereo mini-plug cable, and then connect your Bluetooth device.
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Troubleshooting > Cannot connect to a Bluetooth device