@iragequit: Nice on your find.
As far as fixing it then it's really up to how much are you secure in your abilities to solder and test. If you are not sure then don't take the risk and go to a professional, or better yet, contact Electro Harmonix.
If you decide to take a crack at it then you should start from the simple stuff.
First of all you need to learn a few things:
- If you don't know how to then you must learn how to solder. There plenty of good videos online that teach you. Main thing to know is Less Is More.
- Always draw the component you are switching and how the wires are connected. Don't rely on memory.
- As @somejerk said. Get yourself a good soldering station. Also helps to have a good magnifying lamp.
- Get yourself a multimeter.
I know it seems like a pretty penny to invest in and taking to a pro might be the cheaper option but you'll have indispensable tools for future use.
First You need to check if there's power going into the board. Since you say it's an old Muff then it's probobly the one without the LED light. In that case you need to find the point on the board where the positive is. Most of the times it's a red wire coming from the power jack. If you see no power coming from to the board then all you have to do is replace the wire. Also it could be a defective power jack.
Next you move to the switch. Most of the times a broken pedal means a broken switch. In that case just replace it. A new dpdt switch are very cheap and you can find them virtually at any electronic store. I have done it many times. It's very simple and easy and it saved me a lot of times of going to the store to get it fix and paying way more.
If it's not the switch then you can move to the input and output jacks. There might be broken mono jack. In that case just switch them out. They are fairly easy to replace.
If none of these solve the problem then the problem might be the board. In that case take it to a pro. You don't want to start messing with caps and diodes and all that.
Good luck.
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