mg4586 schrieb:

I did something careless (stupid) and plugged the wrong AC adapter into
my YB 400. The polarity wasn't right, and now it's dead. The digital
display and tuner still seem to work, but there's no sound. I've made
this mistake before with other devices, with no harm done. So does
anyone know, does the YB 400 not have this protection? Or clues to what
it was I fried?

The most likely component is the audio amp (LA4550), these are quite
sensitive to reverse voltage. The rest is behind some voltage regulator
at least. Check the LA5005 output to make sure it's OK.

Stephan
--
Home: http://stephan.win31.de/
Queueing Theory à la Murphy: The folks in front of you take an
eternity, you're through in a second...