HP 2100A Restoration

Lyle Bickley lbickley at bickleywest.com
Tue Aug 2 00:25:28 CDT 2016

On Mon, 1 Aug 2016 22:11:17 -0700
Bob Rosenbloom <bobalan at sbcglobal.net> wrote:


> There's a bunch of small electrolytic capacitors on the Inhibit
> Driver Load Card, A106, that needed to be reformed before my memory
> would work reliably.

> They reformed themselves in one of my units. I had memory errors for
> an hour or so then they went away. On other units, I reformed the
> caps (took the board

> out and slowly brought it up on a bench supply), and had no memory 
> errors at first power up of the system.
> Bob

I had exactly the same problem with the capacitors on a spare Inhibit
Driver Load Card. Most would not reform so I just replaced them with
modern caps. The board (and memory) worked perfectly after that.

73      AF6WS
Bickley Consulting West Inc.

"Black holes are where God is dividing by zero"

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