Yes the field regulator is on the door, it is 3EA push pull firing board, it sends the pulses to the 4EA SCR board on the top of the door. look on the print, it is the board to the left of the motor field scr board, separated by the dashed lines, it says push pull firing board on it. Keepin the tach clean and brushes good is always a good idea. i have some good info on these drive units if you are in need. pm me your email, and i will send you what i have.
