Yamaha YH-E700B Wireless Noise-Cancelling Over-Ear Bluetooth Headphones (Black) - Manual (Page 35)

Cannot connect
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The product is not pairing correctly.
If the information for this product still remains in the list of connected devices on your Bluetooth device,
delete that information and try pairing again.
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“Pairing with a Different Device” (p.19)
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The information for a Bluetooth device that was registered on this product was deleted.
If you pair a device beyond the maximum number of pairable Bluetooth devices, the information for
device you first paired (the oldest pairing) is deleted. Pair this product once more.
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“Pairing with a Different Device” (p.19)
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This product may already be connected to another Bluetooth device.
On your Bluetooth device, remove the connection with this product and then connect this product
again.
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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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The Bluetooth device may already be connected to a different device.
Try disconnecting from the Bluetooth device, and then connect with this product.
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“Connecting to a Device Already Paired” (p.21)
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Bluetooth may be deactivated on the Bluetooth device.
Turn Bluetooth on, and then connect with this product.
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“Connecting to a Device Already Paired” (p.21)
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A device that emits electromagnetic waves (such as a microwave oven, Wi-Fi access point and so
on) might be nearby.
Do not use this product near other devices that emit electromagnetic waves.
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A 3.5 mm stereo mini-plug may have been connected (when connected via Bluetooth).
Remove the 3.5 mm stereo mini-plug cable, and then connect your Bluetooth device.
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The cable may not be correctly connected (when connected via cable).
Connect the 3.5 mm stereo mini-plug cable jack of this product correctly to your external device.
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You may be using an unsupported Bluetooth device.
This product cannot be paired with devices that require a passkey when pairing, as this feature is
unsupported.
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Troubleshooting > Cannot connect