Perhaps someone here can give you better instructions on how to trouble shoot the board. You could also bypass the board and use a router speed control. This assumes you know someone who will do it free, if you pay for labor it will cost as much as a new circuit board. the SCR an electronics tech may be able to do a component level repair. If it's the pot that is easily replaceable, your local Radio Shack or electronics parts place should have one that can be soldered in. Check the potentiometer next, that can be done with a Multi-meter looking for changing resistance as the pot is turned, unplug it from the board and hold the MM leads to the pins. I would first do the sniff test and see if anything smells burnt or looks like it's burnt or overheated, if it fails the sniff test then just order the part. The easiest repair is variable potentiometer, the round thing on the end of the black wire with the white connector on the end where it attaches to the circuit board. The most likely culprit is the SCR, that black thing on the big heat sink, they tend to fail open and that is full speed. The quick answer, I expect you need this circuit board.
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