IIgs power supply

[aiiadict@hotmail.com (Rich J.)]

I started with 4 IIgs computers about 6 years ago, 
all working.  1 motherboard went bad, 1 battery
went dead.  Down to 2 motherboards.

The power supplies have all gone bad.  I am not
loading the IIgs's up with cards, just 3 to four
cards.

I want to fix the power supplies.  

One clicks and buzzes when you turn it on.  The
computer won't turn on and shows no signs of 
getting power.  It is a high frequency sound,
not electric arcing.

The other one does the same noise as above
when turned on.  The Apple IIgs turns on
for about 1/2 second (power light comes on)
If you turn off/back on, it will not do it
again.  Wait five minutes and it will turn
on for 1/2 second again.

I'll take a guess at the problem:  A capacitor
has gone bad.  

Can someone let me know where some test points 
are?

Where's the rectifier?  Are there good schematics
or block diagrams of this power supply?

With a little information I can troubleshoot it
myself.  I looked through the FAQs and found
that caps are the most common problem.

There are no obvious signs of heat damage or
cracked/broken/damaged components.

Power Supply Says Apple Inc. on the end and 
Dyna Comp on the bottom.

Rich