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Post subject: Supersonic 22 works with footswitch, not without.
Posted: Sun Apr 22, 2018 5:38 pm
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My Supersonic 22 started having an issue where it performs perfectly with the foot switch plugged in, but with it unplugged the only thing that works is the clean channel volume and tone controls. I get no reverb regardless of setting, I can't change channels with the front panel button, and I can't switch between Normal/Fat mode with its front panel button. Like I said, everything is perfect when the foot switch is plugged in, so the drive channel, reverb, and Normal/Fat mode all are functional, they just aren't active without the footswitch.

Any ideas on where to start, or should I go ahead and find a repair shop?


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Post subject: Re: Supersonic 22 works with footswitch, not without.
Posted: Tue May 01, 2018 6:41 am
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Joined: Fri Feb 05, 2010 4:31 am
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I understand if amp work with foot switch, IMO you may have issue with front panel switches, contact are dirty or.. ?
I never work on this amp, just look the schematic.

I don't know if you can spray good contact cleaner from the front panel or if you have to go inside the amp.
Photo of these switches may help.


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Post subject: Re: Supersonic 22 works with footswitch, not without.
Posted: Tue May 01, 2018 12:10 pm
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Seems unlikely that all the front panel switches would get dirty enough to fail at the same time...

I would assume that the footswitch jack is a switching jack. With a cable plugged in, it switches off the panel switches and substitutes the footswitch switches. If the jack's switching contact is dirty, the amp would "think" the footswitch is connected even when it isn't.

It couldn't hurt to spray contact cleaner into the jack, then insert&remove the plug repeatedly to clean the switching contact.


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Post subject: Re: Supersonic 22 works with footswitch, not without.
Posted: Tue May 01, 2018 3:02 pm
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strayedstrater wrote:

It couldn't hurt to spray contact cleaner into the jack, then insert&remove the plug repeatedly to clean the switching contact.


+1

JeffyMan,

Use only good contact cleaner like Deoxit. Cheap one may not do the job.


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