[time-nuts] Anyone familiar with SR-620 repair?
wb6fly at verizon.net
Fri Mar 23 21:29:06 UTC 2012
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
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