Yamaha TRUE X SPEAKER 1A User Manual page 16

TROUBLESHOOTING > When a problem occurs
The unit cannot be turned on
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The power button is not being pressed and held.
To turn on the unit, press and hold the power button for at least three seconds.
"Turning the unit on and off (standby)" (p.9)
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The remaining battery level is low.
Charge the unit.
"Charging the unit" (p.8)
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Ambient temperature is too high or too low.
Use the unit within the operating temperature range.
"SPECIFICATIONS" (p.25)
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