25 Nov
2013
25 Nov
'13
4:08 p.m.
The wiring harness between the PSU and the backplane was known to overheat
and burn on highly loaded systems. Because the original harness had wires
of varying length, current was not evenly shared between wires. A
replacement harness had all the wires the same length.
On Sun, Nov 24, 2013 at 10:19 PM, Cory Smelosky <b4 at gewt.net> wrote:
On Mon, 25 Nov 2013, Mark J. Blair wrote:
look for
blocky translucent yellow EMI filtering caps made by Rifa. I don't
have personal experience with a BA23 yet, but I recently discovered the joy
of exploding Rifa metallized paper dielectric caps in a TRS-80 Model 12. I
seem to recall that the same type of cap was one of the things that blew
out in a VCF thread about restoring a PDP -11/44. I now consider those Rifa
caps to be replace-on-sight items, and I'll be replacing them with
metallized polypropylene caps instead of *^!@$#&# metallized paper ones.
Will do. It's certainly lot a metallic or plastic smell...I know those
smells quite well and it was nothing like those. ;)
--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects
On Nov 24, 2013, at 17:43 , Cory Smelosky <b4 at gewt.net> wrote:
> What're the components most likely to fail in a BA23 PSU? I have one
that
> keeps pouring smoke out of it...yet I can
never see a component that's
> burnt, punctured, or other stuff like that. I also never hear an arc
or
anything
exploding. The PSU also squeals when powered down.
What does the smoke smell like? If it smells like burning paper, then