got wife to upload photos
63 volts dc comes into board and goes into the 24-80volt gecko conection an is working and has a large capacitor across this supply
a 24 volt supply comes into board and that goes to the regulator and other components to reduce voltage to 5.05vdc
and this goes up sheilded wire to the gecko and conects to the comm as i understand it should be +5 v dc

pic bellow
on this machine one gecko is used and one rs 4 phase driver
on the conector that looks white i have traced from bob through resistors up yellow and white wires back to gecko drive
they are direct with no extra wires or componets in these lines
the green and blue go staight to rs 4 phase driver board

pic bellow
this is the board that has had extra resistors fitted
i have conected this up to a spare gecko and stepper and got it to move nicely with mack3

hope this has helped
cheers bert

p.s. previous owner had put a stepper behind spindle drive motor and fitted an electro magnetic clutch and fitted a dremel on another axis above chuck
and used it to divide s well as turn bits
cleaver man butt poor instalation and he took what he had done to machines and why to his grave

