Ground Loop(?) leads to blow speaker
I tested using meter set to the V with the 3 dashes below the solid line. That's correct, and that is what I assumed you were doing. I suppose it is possible for a large DC output to occur intermittently, but it seems unlikely. Especially if the problem has occurred when no signal was being provided to the DAC (i.e., when a CD was not being played). Regards, -- Al |
Hi Al! I'm looking at testing the power supply now. Per the Wadia documentation here: http://www.wadia.com/ContentsFiles/Wadia%20121%20Brochure%20web.pdf • Multiple stages of regulation were designed into the main circuit board to ensure quiet, stable DC power is available for all sensitive circuits. • A dedicated voltage regulator for the master oscillators is used to provide clean pure DC power for maximum clock stability. I wouldn't know where to start testing those pieces and do not want to dig around inside of the unit. On the repair bill they stated that the internal power supply was replaced as well as an IC. My aim again with all of this is to get some measurement of the issue prior to sending it back to them. |
Not sure what to suggest at this point, other than measuring the DAC’s output on the 200 volt AC scale as was suggested (while no music is playing). It would be nice if it were possible to also measure the output voltage(s) of the DAC’s external switching power supply, but that would seem to be impracticable due to the nature of the connector and the lack of definition as to how it is wired. I suppose it's possible that it has been intermittently misbehaving, and caused the failure of the internal supply. Good luck. Regards, -- Al |
