Thanks for your help, guys! I think the key contact are not the problem, since I cleaned them before and worked perfectly... The power supply could be the reason... Who knows! I'll try to find someone to check it for me (I don't have a multimeter). The thing is that the P6 worked perfectly (but effects) before it stopped delivering any sound... I'll tell you all about any progress... Best regards, Pako.
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Re: Dead Polysix: No sound on my P6 (nothing, not even hiss)!!! Help!
2012-10-17 by pakofeber