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.
Quadra 840av PSU Cap List
Posted by: Iesca on 2025-11-11 12:26:20
I am recapping two 840av PSUs for a client and managed to miss one of the caps when I was making my list. Fortunately I seem to have been able to figure out what it was and I have extras in stock, but if someone who has previously recapped one of these would be willing to post their list so I can verify everything, I would be very grateful. It seems no one has previously posted such a list for the 840AV's PSU, at least not that I can find.

(And I am aware that people often replace these with an ATX PSU, this is for a client.)
Posted by: croissantking on 2025-11-11 12:39:05
Is it a Delta SMP-220DB? My cap list is posted here.
Posted by: Iesca on 2025-11-11 12:39:45
Ah, fabulous, thank you! I seemed to have missed that in my search.
Posted by: Iesca on 2025-11-11 13:39:48
Okay, so, going through my pile of removed caps for both PSUs and dividing in 2, I ended up with a single cap valued at 220µF 16V, which would seem to correspond to C253, which is the cap position in question. The one I have physically measures approximately 12mm H x 8mm W.

Your list has a 22µF, 16V cap in that position, with a measurement of 15Hx18W, which seems odd. (I do have a 22µF 50V for C511, which measures 11x5, matching yours, but no 22µF 16V.)

I also only seem to have one of the 220s. Is it possible it was just missing from one of the PSUs? That could possibly explain why I seemed to miss it, if I happened to do that one first! Though of course it could also have been my ADHD, haha.
Posted by: croissantking on 2025-11-11 13:42:58
Okay, so, going through my pile of removed caps for both PSUs and dividing in 2, I ended up with a single cap valued at 220µF 16V, which would seem to correspond to C253, which is the cap position in question. The one I have physically measures approximately 12mm H x 8mm W.

Your list has a 22µF, 16V cap in that position, with a measurement of 15Hx18W, which seems odd. (I do have a 22µF 50V for C511, which measures 11x5, matching yours, but no 22µF 16V.)

I also only seem to have one of the 220s. Is it possible it was just missing from one of the PSUs? That could possibly explain why I seemed to miss it, if I happened to do that one first! Though of course it could also have been my ADHD, haha.

This was an error which I corrected further down in post #8.

This is also why we need editable posts.
Posted by: Iesca on 2025-11-11 13:44:55
Ahh, perfect. Yes, I agree!
1