Yamaha TRUE X SPEAKER 1A User Manual page 15

TROUBLESHOOTING > When a problem occurs
The unit cannot be charged/It takes a long time to charge
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A USB power adapter that is not compatible with the unit is being used.
Use a USB power adapter that can output DC 5 V (2 A or more).
"Charging the unit" (p.8)
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The USB power adapter's output is not stable.
Not all commercially available USB power adapters are guaranteed to be compatible with this product.
Try using a different USB power adapter.
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The USB power adapter and this unit are not properly connected.
Check that all connections are made properly.
"Charging the unit" (p.8)
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Ambient temperature is too high or too low.
Charge the unit within its temperature range for usage (5°C to 35°C).
"Charging the unit" (p.8)
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Charging is taking a long time.
It is possible that charging is stopped. Disconnect and reconnect the included USB cable and charge the
unit again.
"Charging the unit" (p.8)
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The protection circuitry of this unit has been activated.
Check the lamp display.
"List of lamp displays" (p.23)
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The unit is connected to a USB charging compatible port on a computer.
Charging from a USB port of a computer is not guaranteed to work. Use a USB power adapter that can
output DC 5 V (2 A or more).
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