If I am correct in a quick interpretation in the service manual the power switching comes from MOSFETs located on the processor board which distribute the power to the remainder of the instrument.? This is stated on page 88 of the manual.? This might be a good place to check if you can recognize the transistors which perform that function? If any of them do not prove to be defective and they they do not switch then it may take some back tracing to the controlling? source.? It sounds like that source is probably of a fairly simple design.
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Greg
