> On 27 Jan 2018, at 17:04, Jules Richardson via cctalk <cctalk@classiccmp.org> > wrote: > > On 01/26/2018 07:15 PM, Jules Richardson via cctalk wrote: >> 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 :-)
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. > 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 w: binarydinosaurs.co.uk t: @binarydinosaurs f: facebook.com/binarydinosaurs
