One technique that works for me is to remove the bolts holding the regulator tabs against the heat sink, and ensure that the tabs are not touching same. Then, starting with the unit at ambient temperature, apply power for ten seconds or so, and then use an IR temperature sensor to determine which regulator is getting hot. Lacking an IR tool, a fingertip will suffice. This technique will quickly identify which part of the circuitry is drawing excessive power. Needless to say, the power-on time must be short to avoid damaging the regulators while operating without a heat sink.
73, Eric Lemmon WB6FLY _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.