I had a working MacSE Astec power supply which I recapped. Before I put it back together I tested the voltage on the orange wire and got a steady 5.02v. I buttoned it up and put in a known good machine and nothing, not even the fan spins. Pulled it back out and now the 5V line has nothing. Opened it up again and I can get voltage readings on the primary side but nothing on the secondary. Any hints or tips or suggestions on what to check would be very much appreciated. Thanks.
Help troubleshooting a Mac SE Astec power supply
- Thread starter spacerog
- Start date
either something's shorted or the transformer blew open, do you hear any clicking or high pitched noises? If your ears aren't sensitive to high pitched noises, there are apps you can get for iPhone and Android that are spectrum analyzers
you can test it with a multimeter in resistance mode or an LCR meter in inductance. if it shows as open circuit on either the primary or secondary, the transformer's done for. Has the power supply been recapped?
there is a new board that uses switch mode supplies to generate the voltages needed