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I have both switches on the SCU turned on, I hear the fans on the SCU, but not a high pitched noise. (I also have the slew switch on the back in the run position) I have to start the engraving SW, it...

Hello,

I'm glad your old systems still runs, I recently got a 1988 system 300 that is pretty complete, I have the manuals, the software, the PC with the ISA card etc. I have connected everything...

I have a prolight 1000 with stepper motors, there is a control box that contains a power supply and motor drive circuitry. I looked up the ICs that look like the stepper control ICs and they are ST...