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Permalink Reply by John Sawyer on March 20, 2020 at 1:18pm

Looks like the factory soldered the shield to the ground, and also to eliminate people messing with it...  Was it already broken off?  

I doubt that's your problem, though...  just a ground lug.  grounding a metal shield reduces environmental noise...

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Permalink Reply by Southern Ray on March 20, 2020 at 2:32pm

Thanks for that info John. I got the circuit board out of the frame and found more damage. The areas around the contacts are all damaged, or appear to be. I did some research and saw a couple of guys jumper over damage like this. I thought about that for a minute and got to looking over some close-up pictures I took of the circuit board and lo' and behold was more damage by the "drive" button. I am now trying to decide whether to try to fix thing, or try to use the pots, resistors, caps, etc. from it to build other smaller amps. Thoughts? I really don't like to give up on things, but should I, in this case? 

Thanks!

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Permalink Reply by Southern Ray on March 20, 2020 at 2:42pm

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Permalink Reply by John Sawyer on March 20, 2020 at 2:54pm

I would scrape back the solder mask (green paint) by the ground pad on the left, and then run a jumper wire to the signal leads back to the solder pad just out of the pic...

10 minutes of work could save you hundreds on your car insurance... er... amp...

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Permalink Reply by John Sawyer on March 20, 2020 at 3:01pm

it looks like somebody replaced the jack, but used a high wattage gun and burned the pads off the circuit board... totally fixable.

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Permalink Reply by Southern Ray on March 20, 2020 at 3:44pm

Thanks for the help on that. Kinda what I thought, but my skills on this stuff is minimal. The top picture wasn't clear so I added a couple below. They show another burn. I guess it is repairable as well? Should I check other components with a multi-meter?

Thank you!

Attachments:

• 014.JPG, 94 KB
• 015.JPG, 100 KB

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Permalink Reply by John Sawyer on March 20, 2020 at 5:47pm

Those don't look like burns... they look like goo on the surface??

You can check continuity between the solder joint and the existing trace... you won't hurt anything by scraping back the green mask...

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Permalink Reply by Southern Ray on March 21, 2020 at 4:05pm

Turns out that was goo, as you suspected. One more question, if you please. Should I resolder the board to the cover, use a jumper to it so it's flexible...?

Thanks for all your help!

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Permalink Reply by Southern Ray on March 20, 2020 at 7:20pm

Thank you John!

I'll try messing with it tomorrow. I've been concentrating on getting a blog out about how I wind pickups, but I lost two hours work in two "hiccups" with the website's blog software.

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Permalink Reply by John Sawyer on March 21, 2020 at 6:25pm

Either way you ground the shield should not matter....

where do I find your pickup winding blog?

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Permalink Reply by Southern Ray on March 21, 2020 at 8:28pm

 It doesn't yet exist. It kept disappearing into the ether when I went to post. Spent roughly an hour or so entering the text and pictures and then - poof! - twice. Gotta figure something out. Told Myron I would when he asked.

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Permalink Reply by Southern Ray on March 22, 2020 at 7:27pm

Got started on the pickup blog today. You can see it in the blogs section. I'll be working on it as I can this week. Hope to be done in a day or three.

Thanks for all the help on the amp! I am on hold on that until I get out to the electronics store on my next supply run, whenever that will be. I need a new soldering tip before I can do anything more.

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