This may be of use for somebody with a dead PC 8529 router sitting on the s= helf.
My PC 8529 speed control failed after about 25 hours of use. I called PC a= nd they were not very helpful. The part was no longer available; they woul= d not fix it; company policy prevented them from sending me a schematic for= the board. Basically, I could buy a new PC router or I could send it to th= em; they would convert it to a single speed router! The fact that it had ve= ry few hours on it didn't seem to phase him. =20
I found a helpful note from a few years ago that worked. The speed contro= l board has 2 surface mounted capacitors. In my case, the one on the upper= left corner of the board was bad. Found a replacement (22 microfarad 25 = volt) in an old defunct TV board and installed it on the router. WORKS!