Greetings.
I'm wondering if anyone has had success recapping a 983 PSU for the Cube or one from a Slab? In a past post, "About these pesky capacitors...." [
https://www.nextcomputers.org/forums/index.php?topic=4008.msg23223#msg23223] - the consensus was that the PSU for a Slab is a pain to deal with.
If anyone has recapped either, let me know. I have some questions...well, a lot of questions. 😁
I've actually just embarked on recapping one of my two Cube power supplies.
I've started a page on Caps Wiki for my notes:
https://caps.wiki/wiki/Sony_CD-61C_(NeXT_Computer_Power_Supply) (
https://caps.wiki/wiki/Sony_CD-61C_(NeXT_Computer_Power_Supply))
I contributed the specs of the original caps; some other kind person is starting to fill in the replacement parts. I had planned to do that once I was actually sure my replacement choices worked and fit correctly...
Are there any questions I could help with?
I've recapped three Cube PSUs, but it was a long time ago and I remember little. There were some large primary side caps whose replacements I could not source either in capacitance or in form factor --- I had to round up capacitance to the nearest standard value and actually cut a bit into the PCB to make modern replacements fit. There were also some secondary-side Chemi-Con caps whose series designation indicated that they were custom/special order in one way or another; I replaced them with standard parts and wound up doing OK in that way.
I dimly recall needing a tiny metric spanner (wrench) to open up the PSU completely, although that may have been the monochrome monitor. I think it was the PSU though.
I opened up my slab's PSU once and, noting its surprisingly dense construction, decided that I should close it back up again and do something else with my time.
Quote from: stepleton on March 29, 2024, 11:25:04 PMThere were some large primary side caps whose replacements I could not source either in capacitance or in form factor
Yes, I think C122 & C123 are really hard to find because they have these 90° offset mega-pins that connect to the board, as much for structural stability as electrical continuity. I special-ordered two of these (
https://www.mouser.com/ProductDetail/Chemi-Con/EKVA451VSN781MA50S?qs=HoCaDK9Nz5fPd2XOLtKdFg==) and they *almost* fit, as long as you use a strong pair of needle-nose pliers to pull each of the legs away from the center. I think I would need to hot-glue the new ones in place since they are so large and don't sit flush to the board. Since these kinds of caps (450VDC 780uF) rarely go bad, my backup plan is to just to revert to the originals if these don't work out.