BA123 Power Supplies

From: Jerome Fine <jhfine_at_idirect.com>
Date: Sat Oct 3 23:22:56 1998

>Zane H. Healy wrote:

> If it isn't one problem it's another. Last night I left the PDP-11/23+
> (still haven't gotten it to work with a /73 CPU board) running for about 4
> hours to see how it handled being left on. The only thing running was
> "show mem" on the console since I was working on some other stuff.

Jerome Fine replies:

I agree that this is a valid way to test a "new" system.

> Much to my terror/irritation, about 10pm I noticed a buzzing or sparking
> sound. I quickly moved it away from the sofa, and started investigating.
> It sounds as if something in the area where you've got the breaker and the
> powercord plugs in is 'arcing and sparking'. I've got to take off in a
> little while, but I plan on looking into this later this afternoon or
> tonite.

I also lost the power supply on 2 BA123s in the past, but it seems
that it was the capacitors which rectify the DC output.

> Unfortunatly I don't have any docs on the BA123 (just the BA23), so will be
> having a fun time figuring out how to get it apart.

The whole power supply comes out if you unlock 4 bolts holding the
power supply in place and also disconnect the cables at the front.
Opening the box is only a little more difficult. I did so without any
specs.

My problem is that I have neither the equipment nor the inclination
to fix a power supply from either dead one from the BA123. I offered
both of them before, likely for local pickup only since they are
very heavy and I also don't have any boxes to package them.

Is there anyone who wants a spare (but not unfixable) power
supply for a BA123. I will even through in one backplane box
as well, but the wheels have been removed.

Sincerely yours,

Jerome Fine
RT-11/TSX-PLUS User/Addict
Year 2000 Solutions for Currently Running RT-11 Applications
(Sources not always required)
Received on Sat Oct 03 1998 - 23:22:56 BST