IBM PC/XT (Model 5160): Part 7b (PSU refurbish completion)

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Australia The Clueless Engineer
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Published on ● Video Link: https://www.youtube.com/watch?v=dIgGXR5zk6A


Duration: 16:58
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The PSU refurbishment is finally completed. Thanks to everyone for your advice about treating the rust - I ended up getting some phosphoric acid to treat the rust and then re-spraying with a silver paint. The rust is internal to the PSU so not really visible, but I treated also the fan exhaust (that is visible). If I had some idea where I'd put my Dremel then I'd probably have used that as well.

Along with the PSU case refurbishment I replaced to two blown X2-class RIFA capacitors (0.1µF/104, 275VAC) and almost all the electrolytics - I left the two large 200V 470µF capacitors (as per @Chriva's advice).

The RIFA capacitors provide some filtering for any noise that might be coming in on the power circuit - I could've left them out but have replaced them with Suntan make equivalents.

This is the list of capacitors I ended up replacing - remember that this is a 220VAC PSU for Australia (240V):

0.1µF 275V X2-class (2x)
1µF 50V (2x)
2.2µF 50V
3.3µF 25V
10µF 25V (4x)
22µF 16V
47µF 16V
100µF 25V
330µF 16V (2x)
470µF 25V
1000µF 25V
2200µF 10V (2x)
4700µF 16V

The bottom case is also complete - I had it professionally sand blasted to remove the original black paint coating (and rust) and have re-sprayed it myself with three coats of primer and three of satin black topcoat.

The top case was professionally sand blasted/primed/powder coated.

I disassembled the IBM Model 5151 monochrome display and scrubbed the case clean.

In my humblest of opinions, I think the machine is going to look gorgeous - I'm looking forward to trying Pacgirl and Zork.

https://archive.org/details/PacGirl_1020

For now it will just be a 256KB machine with MDA but I am planning on upgrading the system board to 640KB (need 41256 chips), installing a CF card (via XT-IDE interface) and maybe also a 720KB 3.5" floppy drive which I think should be supported with the updated BIOS I've installed.

I would like to upgrade the display card to CGA at least ... the IBM Model 5151 monitor is monochrome green so I could live with monochrome CGA graphics.

More videos on troubleshooting IBM PCs & compatibles:
https://www.youtube.com/playlist?list=PL5pwokf56wMLjhEgssoRyZJO1VWeQ09ij



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