Thx for reply rnr107, and beleive me i will but at a later stage i think.
I suspect everything to be in order except for an apparently dead Y axis IS5063 sensor(no light).
By manipulating the different sensors, it was no problem running all axis manually. Changing the IS5063 sensor should solve the problem i hope, and if not they are good sensors for a Mach3 system as well.
My plan was to make use of it while planning rebuilding it to Mach3. My main concern is to find a proper milling motor that could handle a bit more load, and a Controller that could handle the ATC installed.

I got an HBM BF25 mill that i have converted to Mach3, and i can use this one to make parts when converting the 300 VMC mill if needed.
Any suggestions as to types of Mach3 Breakout Boards to use for handling the original ATC ?
Any experience with the original stepper motors ?