Question about Yamaha Electric Guitar

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On power up there is a loud humming even with volume at 0

I have a Yamaha G100-212Guitar Amplifier. It didnt work when I first got it. I replaced both of the power output transisters.Powered up and played the guitar for about 5 minutes. Then I turned it off and I turned it on again there is this loud humming noise.
I have the schematics. Any suggestions whats causing the noise?

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  • Shahid Electronics
    Shahid Electronics May 11, 2010

    Check same transistors again and driver transistor in amplifier section.



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On power up my kurzweil micro piano has no audio out and loud hum

Posted on May 21, 2010

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I would also be inclined to check all the larger electrolytic capacitors in the power circuits as well for AC bleed.

Posted on Feb 24, 2009

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