Hi Steven
I have a SCM Record 1 with Num720B of which the power supply card for the monitor and controller blew. I have contacted NUM, but they wont supply me with any information regarding the card, so i am looking into supplying the controller with a new power supply and hooking the 9pin (with some conversion) up to a normal 15pin monitor. Will let you know if any progress is made. Have unfortunately no idea concerning your problem if your controller is problematic. There is second hand parts available at CNC-Shopping UK website.
If by any chance you have documentation on NUM720 controller power requirements it would be greatly appreciated. I know the voltage requirements are 15V+ and 15v-, but looking for how much amps it draws. Thanks