The jukebox will outputs a power level of 15 when playing music discs. The comparator is not affected.
Linked issues
is duplicated by 5
MCPE-37323
Jukeboxes emit a redstone signal when they contain a music disc (no comparator!)
Resolved
MCPE-63653
There's a problem with the record player
Resolved
MCPE-97552
Jukeboxes give off a redstone signal Without a comparitor when playing music
Resolved
MCPE-116774
Hoppers not working when next to jukebox
Resolved
MCPE-150350
Jukebox with disk activates TNT
Resolved
Thank you for your report!
However, this issue has been closed as Working as Intended.
This small exclusive feature is hinted at in the how to play section of the game also:
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