I like to buy all my pots/switches etc from here: http://www.rapidonline.com/ You get your order pretty much next day too.
As for references, scouring the internet is a good place to start, but it can get way too technical and seem really daunting to a beginner (myself included). Best thing to do is go on Amazon and buy Reed Gazhala's book on circuit bending. It's really easy to follow and is a fairly good read too.
the best way to test a machine is to *sorry if this sounds obvious* put new batteries in and press 'on'. If that doesn't work then there's a good chance it's bust. If you're an optimist or just in denial you can pop the casing open and start probing the circuit for signs of life... I had this problem with a speak and spell and it turns out that the membrane/keypad was buggered. A bit of research and a lot of time and patience and iron-burns and it's up and running again and making the most random noise
Good luck with your projects and I hope this helps.
Nice one! sorry I should have posted this on the discussion board, but I got confused for some reason :O)
I'll check that link out dude, thanks! Yeah I do want to try to fix the Tandy because surely its just logic and learning that I need. I was also thinking of purchasing the book, but wondered initially whether it would be more suited for American readers, but obviously there is a wealth of info thati need from that material :
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