dc 24 head motors are all the same changing over as far as i know, early 24's had the cut out switch on the side. (or was it later heads had the cut out switch)
There is a chance it isn't the motor at fault, the yoke cable red/white (from the axis side) can break. I have also had the 1 ohm resistor on the dc24 head power pcb blow and go open circuit.
pop a volt meter set on ac ~ 500 and measure for voltage 230v on the main body head connections, oh and ensure the head switch next to power switch is correct.