Re: Apple ///: burned Power Supply

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

N.N. Thayer wrote:
> On Jan 24, 1:00 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:
>
> > Jerome Vernet wrote:
> >
> > > James Littlejohn a �crit :
> >
> > > > Simply replace the capacitor.  The same thing happened to my Apple
> > > > III.
> > > > http://8bitsystem.com/Apple%20III/
> >
> > > Looks like the same thing ! Can you give me any reference of the
> > > replacement capacitor you used ?
> >
> > I'd recommend at least a 400v capacitor--and if you can get one
> > rated for AC, all the better.
> >
> > I can't find an Apple /// power supply schematic, but it looks
> > like this capacitor is across the AC line to suppress transients.
> >
> > If it's hard to find, a 0.1uF capacitor would work well enough.
> >
> > -michael
> >
> > NadaPong: Network game demo for Apple II computers!
> > Home page:  http://members.aol.com/MJMahon/
> >
> > "The wastebasket is our most important design
> > tool--and it's seriously underused."
>
>
> Apple /// power supply schematic is here:
>
> http://www.1000bit.net/SUPPORT/SCHEMA/a3/050-0057-a.jpg
>
> (They have what looks like the complete set.)

Thanks for the reference!

In the schematic, they only show two 0.1uF capacitors bridging the
AC line, plus two disk ceramics--revisions, revisions...

Wow, Apple must have had FCC trouble--I've never seen a computer
power supply so heavily RFI filtered on the AC side!

-michael

NadaPong: Network game demo for Apple II computers!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
tool--and it's seriously underused."