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Post by blairjames on Sept 23, 2019 9:10:56 GMT -7
Hey guys! for years now i've been noticing that i had random volume jumps with my amp. and found out today with a little experimenting that something is wrong with the footswitch jack for eq bypass. i never plug my footswitch in but today i did and when i stepped on the it i found that it was the same volume and eq jump as what has been happening for the last couple of years. any ideas how to fix this?
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Post by doctorice on Sept 23, 2019 11:07:17 GMT -7
Maybe you should run the amp with the footswitch plugged in and set at "off" and see if the problem goes away or not. If you can't get the issue to re-occur, my guess is that the footswitch jack is damaged.
It could be something else, but at least this is a low-cost diagnostic. Give it a try and let us know what you find.
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Post by purpletele on Sept 23, 2019 15:17:52 GMT -7
blairjamesThe EQ Bypass is engaged by lifting the ground wire on the Mid Pot of the tone stack, that takes the tone stack out of the loop. That ground wire is most likely orange or Yellow and instead of being connected to ground near that Tone Stack the wire is snaked to the back to the By Pass Foot Switch. The foot switch Clicks the ground wire on and off. 1. There might be a problem with the Jack, this is most likely. 2. The ground wire has come off at either one of the connections. Not so likely. Here is a picture of my Therapy with the Yellow Ground wire on the Middle Pot snaked over to the Jack. I used the Blue line to depict the path. Those jacks can certainly fail or corrode. I would suggest pulling the chassis and posting a photo of the Tone control wiring and also a photo of the connection to the jack. I place $5 bucks on the jack
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Post by premiumplus (Dave) on Sept 23, 2019 18:59:35 GMT -7
Clean the points that form a switch on the jack when you unplug. You'll see it happen with the chassis out, just plug into the jack and there's a little leaf spring with a point on it. Make sure it's clean and makes good contact, you might have to form the leaf a little to make it tight. I'm almost sure that's your problem. Like Brian alluded, it's an easy fix.
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Post by pcns on Sept 26, 2019 9:14:25 GMT -7
you can take electronics cleaner and rub it on the plug and then run it in and out of the jack while it is still wet. wipe it clean and repeat a couple of times. I have some small brushes you try as well, message me an address and I can mail you one.
Further on this topic. Make sure all of the connections are tight too. Take a socket and make sure the nuts are tight. Dr Z has an AMA video showing this process.
my 2 cents, Todd
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