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:	post by the_taste_of_cigarettes at 2010-12-05 19:40:29

I've built a few pedals, repaired a few, studied a bit with my father-in-law that's an electronics engineer, and read a ton on electronics.

I've diagnosed and repaired two of my amps.

Not starting a business or anything, I do this stuff for myself but if it's an adapter jack that's very easy to diagnose in minutes if not seconds with a multimeter and it's also easy to resolder it or put in a new jack.

Mostly what I'll do is open the case, run the multimeter around the board, look for any obvious problems, and if I can't find any, close it up. If something is showing a weird reading I can usually figure out why and most often with discrete components the deal is to just replace that one part. Can't really save them unless it's dirt in a pot or something.

I'd check traces to see if there's a break for some reason, check resistors to make sure they are reading correctly (they can blow, surprisingly), and see if all the areas that connect are, well, connecting.

It's not much work, you get charged by most places for that but it's literally sticking probes in a few spots and looking at what the meter says.

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