Yamaha YH-L700A Noise-Canceling Wireless Over-Ear Headphones - Manual (Page 35)

No sound can be heard
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This product are not connected to a Bluetooth device.
Pair this product.
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“Connecting to a Bluetooth device” (p.18)
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The volume is too low.
Raise the volume.
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“Adjusting the volume” (p.22)
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The music stopped playing back.
Start playback.
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“Listening to music” (p.23)
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The cable may not be correctly connected (when using the 3.5 mm stereo mini-plug cable).
The 3.5 mm stereo mini-plug cable jack of this product may not be correctly connected to your external
device.
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“Connecting using the cable” (p.20)
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The volume of the external device is low when using a 3.5 mm stereo mini-plug cable.
Raise the volume on your external device.
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Troubleshooting > No sound can be heard