Sony CMT-SBT300W Operating Instruction page 26

Notes on charging
•
You cannot charge the USB device when the
system is off. Some USB devices may not be
charged owing to their characteristics.
•
If the system enters Standby mode during
charging of a USB device, the charging stops in
progress. Before charging, turn off the
Automatic Standby function. For details, see
"Setting the Automatic Standby function"
(page 55).
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