HP 2100A Restoration

Glen Slick glen.slick at gmail.com
Tue Aug 2 11:42:14 CDT 2016

On Mon, Aug 1, 2016 at 10:25 PM, Lyle Bickley <lbickley at bickleywest.com> wrote:
> On Mon, 1 Aug 2016 22:11:17 -0700
> Bob Rosenbloom <bobalan at sbcglobal.net> wrote:
> --snip--
>> 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.
> Lyle

That is good information to know. I have a 2100A that I haven't
touched in a while. It had memory issues that I never got around to
trying to debug. Next time I work on it I'll look at the IDL card.

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