Rockola CD8B Nostalgia question

I got a new (slightly used) Rockola bubbler for Christmas. I notice on
the left of the coin acceptor slot there is a plastic insert that says
"'25c' and 'QUARTERS ONLY'". This plastic does not light up, either on
FREE PLAY or when requiring coinage. Is it supposed to light up at
some point, maybe only for certain prices? If it's supposed to always
be lit, how do I enable it?

Thanks for any help.

Vic in Central FL
for pictures of the Rockola -
http://hometown.aol.com/vicbehan/juke.html