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Old 11th July 2008, 12:09 AM   #1
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Default Mastech Triple DC power supply

I have a Mastech HY3003m-3 triple dc power supply. There are two 0-30 volt outputs and a fixed 5 volt out. I have lost control of the 0-30 volt output labeled "Master". It just sits at 9 volts out and won't respond to any button presses.

There are two microcontrollers on the back side of the front control panel. Can't tell exactly what they are because the numbers are scratched off. I think it may be that just the micrcontroller is toast. I tried swapping the microcontrollers and the master side worked just fine

Does anyone have any ideas? I can't find a schematic. And the company is no help either.

Thanks.
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