On the power supply/control board, measure TP4 for -20VDC. IF TP4 is not -20VDC, then U6 LM337 Negative Voltage Regulator (part number 227-0337) on Power Supply/Control board is most likey damaged.
There is a -20V and flashing LOCK indicator on my FX 50 Exciter, what could be the problem? Print
Modified on: Tue, 8 Oct, 2019 at 11:13 AM
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