HP 2100A Restoration

[Glen Slick]

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.