Yamaha YH-L700A Noise-Canceling Wireless Over-Ear Headphones - Manual (Page 34)

Troubleshooting
Read this first
If this product does not operate normally while you are using it, first check the following.
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Turn the power off and then on again.
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Make sure that this product have been sufficiently charged.
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“Charging this product” (p.12)
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Update the firmware of this product to the latest version.
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“Updating the firmware” (p.33)
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Also, check the following.
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“No sound can be heard” (p.35)
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“Power will not turn on” (p.36)
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“The product cannot be charged” (p.37)
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“Cannot connect to a Bluetooth device” (p.38)
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“The product does not operate or play back” (p.39)
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“The sound is distorted, noisy or choppy” (p.40)
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“Problem Still Not Resolved (Customer Support)” (p.41)
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Troubleshooting > Read this first