Re: Power supply repair

[Michael J. Mahon <mjmahon@aol.com>]

Wayne Stewart <waynejstewart@gmail.com> wrote:
> In this case the fuse was still good. I had to drill out the two
> rivets to open the case so no one had tried any repairs before. The
> voltages are reasonable. According to my multimeter both 12 volt are
> at 11.78 and the 5s at 5.13 1nd 5.11. That's under a light load.
> Maybe I should hook it up to something and put it under heavier load
> for a day or two.

That all sounds good. Running it under load is a very good idea. 

> On Jul 2, 2:00 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:
>> If one line diode shorts, the other(s) short almost immediately, and
>> the line supply filter electrolytics will also be taken out.
>> 
>> If a line supply electrolytic fails shorted, the diodes will be gone
>> within seconds.
>> 
>> So it's hard to know exactly which scenario caused the failures, but
>> typically several components in the line supply will be zapped at the
>> same time.  Usually, this also takes out the fuse.

-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon