You hear sound from the built-in speaker even when headphones (not supplied) are connected.
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When the headphones connection is loose, you may hear sound from the built-in speaker as well. Disconnect the headphones and connect them once again.
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[Audio Output] for the FM radio function is set to [Speaker] with the OPTION menu (ICD-UX570F only).
Set [Audio Output] to [Headphones].
The contents of the Help Guide may be subject to change without notice due to updates to the product's specifications.