I have problems with an ASTEC AA13780 SMPSU from 1988 in an old Mac II, basically the output voltage is a tad low causing the computer to fail, the first clue was the buzzing sound in the audio loudspeakers suggesting the caps are on their way out. So the plan is to replace the caps, easy thing to do, but I wonder if it is possible to adjust the output voltage a tad. There seems not to be a preset (variable resistor) so I assume the circuit uses a zener or some other reference.
I guess the answer is no, but anyone have a circuit diagram? Or know how the PSU gets a reference.
thanks
I guess the answer is no, but anyone have a circuit diagram? Or know how the PSU gets a reference.
thanks
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