JVC KD-S580 Manuel D'instructions page 13

Prohibiting CD ejection
You can prohibit the CD ejection and can lock a
CD in the loading slot.
Press and hold CD and 0 for more than 2
seconds.
CD
"EJECT" flashes on the display for about 5
seconds, and the CD is locked and cannot be
ejected.
To cancel the prohibition and "unlock" the CD,
press and hold CD and 0 again for more than
2 seconds. "EJECT" appears on the display, and
the CD ejects from the loading slot.
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