No sound
Are you using the original PA-4 power adapter that goes with this unit? Using the wrong one would cause it to not work properly. Weak batteries would do the same. A generic power adapter would also, if working would cause static noises in the sound. The PA-4 is an odd unit, it is 10volt DC at 1 amp output. IF the one you are using is less than 1 amp, meaning if it says 400mA or something with an "m" in front of the A, UNLESS it is at least 1000, then it isn't strong enough to work correctly, EVEN if it powers up. If you have the wrong one, you can find it here:
https://www.google.com/search?q=Yamaha+PA-4+power+adapter&hl=en&source=univ&tbm=shop&tbo=u&sa=X&ei=kPFbUeb1LoPk9ATzwIDwBw&ved=0CD8Qsxg&biw=1440&bih=756
I hope this helps you.
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