Most likely the U402 voltage regulator (part number 227-0339) is faulted. This can be checked by measuring TP5 on the PS Control board. If +20V's is present on TP5, then suspect a bad +28V power supply (part number 979-0411).
I have a missing +20V LED indicator on the front of my FM 100C Exciter, what is damaged? Print
Created by: Rick Voepel
Modified on: Tue, 8 Oct, 2019 at 10:55 AM
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