On Wed, 14 Nov 2018, 18:14 Gerhard Hoffmann <[email protected] wrote: > > > If more than one replacement unit does not work, then it is not > > improbable that the switcher needs a minimum load to start. >
There is a minimum load specified on the 5 V rail, and someone wrote above that the GPS receiver does not meet that requirement. I tested my supply in the GPS receiver, but it may be worth having another go while definitely meeting the load requirements. > > Also, a shorted capacitor can show excellent ESR. > Luckily I have a Peak ESR70 ESR/Capacitance meter. > I once had a cycling power supply in a W&G TSA-2 spectrum analyzer. > > It delivered power for some seconds, and that was enough to trace > > a voltage to a faulty feedthrough capacitor. A DVM with enough digits > > helps a lot. Towards the short, the voltage sinks mV by mV. > One of the problems with this PSU is a lot of components are glued together. It is almost impossible to see if some tracks belong to a capacitor or not. The board layout leaves a lot to be desired. There are components mounted about 45 degrees to the board to fit them in. > > > regards, Gerhard.. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
