Hi,
I acquired, and am refurbushing a 1980 Apple II Europlus. It's been in storage since 1990. I fired it up, and there was smoke, fizzle and bad smells. No surprises there. I popped the rivets, and the .47uF 250V Suppression cap had split.
Following an excellent article (http://forums.overclockers.com.au/showthread.php?p=14154884) I have ordered a set of 11 replacement capacitors made by Hitano. I have been unable to get C5,C6, C24,C25 which are shown as 47uF 250V. So, a couple of questions to any kind soul who might be willing to help.
1. Is it generally necessary to replace the lot? (I've ordered an ESR meter, should I be able to tell good ones from dodgy ones with that?)
2. In order to remove the PCB form the PSU case, I removed the incoming mains Live and Neutral wires from the PCB - they were attached using some kind of push-on connectors, and left behind a bullet connector sticking up from the PCB. Does anyone know what type of connectors these are? I damaged the female part (the part on the end of the Live and Neutral wires), and I will need to replace them.
This was my first computer, in 1979, where I became addicted, and started a life long career in the software / hardware game. I'm really looking forward to getting this thing back on the road, and getting UCSD Pascal up and running again. Some of the younger guys I work with from time to time think that the Java Virtual Machine was a new and unique concept - hah!
Cheers,Con
I can tell you that those who want to be completely thorough will insist on replacing all capacitors no matter what. As for finding that particular cap (4.7uF 250V) you can always try to find one that has a higher voltage rating and temperature rating.
Hi greycon,
I don't know the name of the connector but you cant always remove the male part and solder a wire directly to the board.
When I work an my PSUs, I don't even remove these wires.
Thanks Anthony. On mine, the wires were connected to the mains input socket and the switch - which were attached to the metal case - so it just seemed easier to leave them there and detach the wires from the board. My bad!
I was thinking of tinning the ends of the mains wires, and using a "Chocolate Block" connector to connect them to those posts.