I am slowly working through troubleshooting. 5V bus reads 450 ohms. Powering 5V bus through external power supply shows 90 mA, which seems reasonable. I want to try to power the 3.3V bus with an external power supply. Is this reasonable?
My thinking is that the likely failure was C107 (unclear reason) and that took out Q108 and likely other parts on the 5V p/s board. There certainly is no obvious excess draw on the 5V bus. So that means that the 3.3 V bus is also likely good. But I want to make sure before I start swapping p/s boards with my good QMX.?
I'M not sure if extra p/s boards are available and I also am not sure if I can repair this p/s board.?
what think ye all?
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73, Dan? NM3A
