Sony WALKMAN NWZ-A15 Help Manual page 328

Help Guide
Troubleshooting
Digital Media Player
NWZ-A15/A17
Your Walkman does not work properly.
Your Walkman may not work properly if the USB device (e.g. computer) to which it is connected is turned on or off
without disconnecting the Walkman.
Reset your Walkman by pressing the RESET button with a pen or a paper clip, etc.
Related Topic
Resetting your Walkman
4-540-313-13(1)
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