| Attachment | Size |
|---|---|
 Aztec powersupply 1979 | 1.87 MB |
I am working on an AppleII + power Suply that is universal. And I don't have -12v. I replaced all the electrolytic Caps in the secondary section with no joy. Hs anybody worked on this problem in the past. I have a schematic, not sure if it is the right schematic butit is for Aztec and it is euro. It says IIe so it is a more modern design than mine as I don't have Riffa caps in there.
I have never rebuilt a power supply, but I did send my Apple IIe power supply off for a rebuild with modern components. I used ReActiveMicro to rebuild it, and it works great. Here's a link to their power supply page on their website. Perhaps they can help with parts, and you can even contact Henry at ReActiveMicro for some pointers. His email replies take a day ot two at a minimum.
https://www.reactivemicro.com/product-category/power_supply/
Hope that helps in some way!
Joe
+1 on the ReActive rebuild boards.
Disclaimer: there are potentially lethal voltages in a PSU so I do not recommend you working on it and if you do you do so at your own risk.
When it comes to electronics I am a tinkerer but those PSUs are ery basic in construction and I believe the principle of operations is the same between them.
If you get +12V and +5V, you can assume the primary side is working. Did you try checking for shorts on the secondary side?
I found this, can you find your PSU in it? ftp://ftp.apple.asimov.net/pub/apple_II/documentation/hardware/schematics/Astec_Power_Supplies_Aug82.pdf
It may just be the picture, but Z1 (presumably a zener diode) in the lower left of the picture looks a little crispy. Does that part look OK in person?