27 Jan
2018
27 Jan
'18
10:51 a.m.
On 27 Jan 2018, at 17:04, Jules Richardson via cctalk
<cctalk at classiccmp.org> wrote:
On 01/26/2018 07:15 PM, Jules Richardson via cctalk wrote:
We?ve all been there including me earlier! When you have two PSUs in a machine but only
one is connected to the mains make sure you don?t connect a flying lead from the OTHER one
and spend 2 hours wondering why the bloody thing doesn?t work.
After that... well, I need to work out how to get
the entire supply
assembly to start up while it's open, so that I can work on it outside the
machine - then I can at least start looking for differences between the two
supplies (boy, are those things complex, but maybe I'll get lucky and it's
a bad solder joint or cap somewhere)
OK, now I feel like an idiot :-) Anyway, I tweaked my loads to draw a little more
current - and bingo! I'm now getting stable +5V and +12V outputs on both PSUs, a
working card cage fan, and the DC OK light comes on.
This is good, particularly since my own BA123 has been sat in 3 garages then a utility
room since 1998, you?re making me think it MIGHT just power up without any issues.
And THEN I can tackle the RL02 that?s sat on top of it? being able to read my own source
code from the 80s would be a special thing indeed.
?
Adrian/Witchy
Binary Dinosaurs - Celebrating Computing History from 1972 onwards
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