Making a bit more progress.

Eyebolt didn't work out, it fouls the casting and cant be screwed in. Resorted to using a crowbar on the legs of the stand and got it moved enough to get the backplate off.
Managed to get some photos of the main components. I'm guessing this is the main motion controller board.

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Power distribution (????)

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Stepper drivers

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The stepper drivers appear to be labelled XLT50-S which should help me identify the wiring diagram to use.

My plan is to replace the motion controller with this http://www.ebay.co.uk/itm/EU-Stock-4...MAAOSwjDZYde-j

According to some documentation I have found online (http://www.parker.com/parkerimages/e...ive_manual.pdf ) the driver design is at least 14 years old, on the basis of this i'm going to investigate the options for replacing the drivers with something more up to date, any recommendations?