Apple ][e PSU Part Failure Info Search

Hello Folks,

Not sure if this is the right forum but let's give it a try.
I'm looking for Apple IIe PSU information.
These PSUs have several weaknesses after 30+ years.

One being the metalized Safety capacitors (tend to explode into stinky mess) I am searching for additional information on common component failures. There are unique failures between the Anstec brand PSU and Non Anstec brands.

Currently I can not find this information but remember reading about it years ago.

If you have information on the subject please share.

 

Search archive.org if you find google results that no longer work.

http://www.vcfed.org/forum/showthread.php?13620-Power-Supply-dead

 

It's a PSU so standard PSU troubleshooting. Read the Level II service manual, too. There are more than two different PSUs, by the way.

Of course electrolytic capacitors fail after 30+ years! Just replace them.

 

Many of these old caps are still holding strong. I don't have time to fully recap the 50+ computers in my collection unfortunately.
I try to avoid blind recaps with my computers.

What are the other PSU designs? I only have records of two versions during the Apple IIe days.
The "non anstec" all follow the same design from my experience.

Plus a few of those old Apple power supplies have design flaws (like some of the Mac analog boards)
There are many improvements that can ensure reliability .
The above link was helpful though. Wasn't sure if these Apple iie PSUs required fixes other than matching/replacement original parts.

 

Why would you recap a working machine? If you have a non-worker or a fault, suspect capacitors. It's usually easier to just replace them in that case.

The other designs were documented in one of the manuals - I forget which. Probably level II again. The changes may well have been minor - but changes nonetheless if Apple bothered to mention them.

 

I'll dig in the Service Manual again. As for total recaps we are in agreement. I only replace the caps needed/suspect.
Earlier I thought you suggested to replace all caps. I was explaining why I did not recap usually.
Anyway. Thanks again.