68kMLA Classic Interface

This is a version of the 68kMLA forums for viewing on your favorite old mac. Visitors on modern platforms may prefer the main site.

Click here to select a new forum.

missing capacitors in IISI PSU by Plessey

Posted by: ironborn65 on 2020-12-06 05:18:37 Hi everyone, I'm trying to resurrect the Plessey PSU of my Mac IISI, it seems to be rare, Bruce has only the Sony one, and I do not find many information out there. It's rather tight and more complex then the Sony one. I need to admit that I lost two capacitors in my process, no one to blame but me 🙁 . You can find them at the bottom of the pic named C22 and C18 Can some one help me please? I don't find references or schematics I send a message to a guy here who mentioned repairing one two years ago. PF

Posted by: David Goodson on 2020-12-06 11:16:51 I have a Magnetek which I’ve been trying to open. It uses rivets instead of screws.    Does yours have rivets and how did you open it? If I can open mine, I could see if the board is similar and maybe which caps you’re missing.

Posted by: davidg5678 on 2020-12-06 12:07:03 how did you open it? Unfortunately, I think the only thing to do is to drill out all of the rivets. That was the only way I was able to open my magnetek PSU.

Posted by: David Goodson on 2020-12-06 12:07:33 Note this thread where they say it’s a Magnetek and the photo shows the board with Plessey on it.

Posted by: ironborn65 on 2020-12-07 10:13:30 Hi David, that's the one, Plessey is written on the board. No rivets for me, they are used only for the grounds wires. I found the capacitors! The N4007 diode is conducting both ways as it happened to  I'm trying with it now PF

Posted by: David Goodson on 2021-01-14 11:18:24 I have mine open now finally if you still need capacitor info.

1