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I was able to repair this unit, the repair folks at Heidenhain explained that the unit was no longer repairable, but gave me a few tips, It came down to the power supply for the regulated -12 volt...

Gentlemen,

I am trying to repair an old TNC 124 control unit. It powers up with a overheat error.

Somebody replaced the fan under the control PCB (perhaps maintenance) and did not fix the...