I recently acquired two Stanton STR8*100 turntables but one of them has begun to have problems. When I press Start it goes to flyaway speed instantly regardless of where the speed selection button is (33/45/78). I can reach the correct speed by slowing it down with my fingers but if I use the Pitch Slider, Pitch Bend, Pitch Select or any speed change it just goes back to flyaway speed. If I use the reverse button I get any of two reactions, it either stops totally or goes to flyaway speed.
Another thing, when I press the Stop button it does not stop immendiately like it should but acts as motor kill.
Odrec, the input to the speed control is open, there is a wire missing from the 3 wire connection between control and motor. Search the wire back from the control board, one is voltage supply, one is reference, one is signal. You have a meter, right?
Nuck, I have opened the turntable and have been unable to find what you pointed as the problem. If I seen you a pic of the open TT will you be able to point out where the problem resides?