My son handed me a 10 year old external drive enclosure, "Dad this isn't working". A quick look makes me think that the original power supply has been lost. It came back to me with a USB Type A to barrel connector power cable plugged in. Which supplied enough power (when connected to an Apple 5V 1A DC wall wart) to light the front indicator LED but not spin the exhaust fan or power the drive system.
My question is regarding a good protocol to follow to determine the characteristics of a replacement power supply. Obviously I want to avoid releasing smoke if I can.
The unit is labelled as an OWC Mercury Elite-AL Pro, there does not seem to be any reference material for it any more, however it is similar to a current model
I noticed two power regulators on the PCB, one on the front and one on the back. They are labelled L353 G117 (front) which I think could be one of these. On the back is 1117-18 09234D1 which I think could be one of these.
My best guess is that the power supply needs DC 12V 1.5A. I was thinking I'd use a bench power supply to slowly crank up the voltage from 5V to 12V (with the current limited at 1A) and then slowly up the available current to 1.5A. Is this a reasonable plan?