Having a few good ones to refer to can be helpful. A Schematic would be good if you have to repair the electronics. Once you've cleaned the board, spray it down with a quality circuit cleaner, outside so you don't fumigate yourself. And re-solder any suspicious joints, or all of them if they all look cloudy. Old corroded solder points can actually cause resistance, which gets hot and also changes the value of the circuits. Any suspicious looking components, you can un-solder one leg and lift it to check its value with a meter. If it does not have a value written on it, that's when a schematic comes in handy. Any swollen caps must be replaced. Once you've got the circuit looking proper, be sure your motor is in order. Make sure all bearings are free and clean, a drop of fine machine oil if need be. Should be an interesting project!
If you can get all parts off of the plinth, then you can see about cleaning that up. If it's pitted as it appears to be, rub it down with steel wool, in the direction of the grain. And you can get some anodizing die and wipe it on evenly. (If it is aluminum and not plastic) Possibly even cleaning the raised areas with an emery stick. Or better yet, send it out for powder coating? Or paint it with an air brush? Opportunities to customize here. Looks like a fun project!
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