Sony WALKMAN NW-WS623 Help Manual page 19

If the terminals of the Walkman are wet, dry the terminals.
If the terminals of the Walkman are dirty, clean the terminals with a soft dry cloth.
You cannot operate the Walkman in the following situations.
While the Walkman is connected to a computer.
While the battery is charging .
The contents of the Help Guide may be subject to change without notice due to updates to the product's specifications.
Related Topic
Extending the battery life
Notes on charging the battery
Notes on charging the battery after swimming
Specifications
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