8 Feb
2016
8 Feb
'16
8:20 a.m.
2016-02-08 16:25 GMT+01:00 tony duell <ard at p850ug1.demon.co.uk>:
The H765 PSU in the BA11-K and the H777 supply in the BA11-L are fairly
similar. Both have a big mains transformer. Both have the switchers on the
low voltage side, so they are fairly easy to work with both of them. The
big advantage with the H765 is the modular design.
I have one of these on my restoration list. I know the PSU does not
work, and that
others
have tried to fix it before me, who probably know
PSUs much better than
I do. It has core
memory so I really would like to get his one
fixed. I have never seen a
PSU for it come
available in the UK or Europe, so it looks like
it won't be an easy
job. :-(
Which mounting box is it? (The 11/04 could certainly come in 5.25" and
10.5" versions, there
may have been several versions of each). The common 10.5" one, BA11-K
IIRC, is a fairly
easy supply to work on, it's a big mains transformer and the DEC switching
regulator bricks.
The common 5.25" one, with the H777 PSU, is a bit more nasty, the H777 is
a normal-ish
SMPSU. I have worked on both.
-tony