Sony SRS-BTS50 User Manual
Page 106
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If the POWER/HOLD switch is set to HOLD, slide it to the center.
When you cannot operate the system even if the system is turned on, press the
RESET button on the left side of the system with a thin object like a small pin.
Then turn on the system following the correct procedure. If the system does not
restart, consult your nearest Sony dealer.
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