how do I change the capacitor in the hotpoint TC650 tumble dryer?

I don't know either - I guess you mean a motor start/run capacitor in a big can. This is what I would do...

First find the capacitor - with the AC power disconnected - Put a tape on each wire with a number on it - draw a picture with the numbered wires running to each connector - take a digital 'photo.

Carefully short each terminal of the capacitor to every other terminal with a screwdriver blade to remove any charge that may still be held.

Pull off the connectors - remove the old capacitor - fit the new one - put the wires back according to the drawing.

Peccavi
October 2010