JVC KD-LX30 Instructions Manual page 37

To play back only intros (Intro Scan)
1 Press MODE while playing a CD.
"MODE" appears on the lower part of the display, and the number buttons
can work as different function buttons.
2 Press INT (Intro), while "MODE" is still on the display.
Each time you press the button, CD intro scan mode changes as follows:
Mode
INTRO 1
Track number flashes
Disc number flashes (when
INTRO 2
it is shown on the display)
INTRO 1
Indication
INTRO 2
Canceled
Plays the beginnings (15 seconds)
Of all tracks on all inserted discs.
Of the first track on each inserted disc.
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