My wife has a Claravox Centennial that she purchased about two years ago. Up until yesterday, it had performed well. Yesterday it made a thump sound in the middle of playing and now there is no sound output in any mode. For a test, I connected the iPad app and updated firmware, which went successfully, but there is still no sound, not even from the headphone output. I am an old analog circuit EE, so I connected an o'scope to the Main, Pitch, Tuner, and Volume outputs on the back just to see if there was any recognizable signal. All of these look flat-lined on the o'scope.
I took the covers off to look for damage. I carefully powered it up with the covers removed and discovered that the 10V regulator (U52) was screaming hot and its output was only 1V, rather than 10V. By lifting the output pin of U52, I determined that the regulator is fine, but being severely overloaded by a short elsewhere on the board.
Has anyone seen this type of failure? Something on the board is really hogging current, but I can't find another hot part besides U52.
Thanks in advance for any assistance anyone can provide. Does anyone have a schematic for the Claravox?
