Hi Martin,
I’m sure Burroughs used (and maybe designed) these modules since the
Panaplex was their creation.
I have a schematic for a similar Victor calc model 18-1721 and mine is 18-1441.
They are mostly identical
except the 1721 has scientific functions and somewhat different logic but the
display circuitry seems to
follow what I have in mine. The thought of a module swap had occurred to me and
I will probably do it if
I can’t get a replacement. The thing is, it would only verify if the part is
indeed bad - not how to get a
replacement if it is. Group member Ira also suggested using discrete parts.
There is a hint of what is
inside the segment driver portion of the module shown on the schematic but not
all 9 parts are ID'd.
I’m going to wait a little while for a possible replacement and, failing that,
I will probably try the part swap
to at least verify my suspicions. Thanks to you and Ira for all the good
suggestions.
All the best,
Rich
> On Sep 26, 2021, at 4:07 PM, Dekatron42 <martin.forsb...@gmail.com> wrote:
>
> Burroughs used similar modules (as did probably other companies too) in some
> of their designs. I think it should not be to hard to reverse engineer the
> design and make your own similar modules if necessary.
>
> Have you tried to swap two modules to see if the fault follows the module?
>
> Do you have the schematic for the caluclator?
>
> /Martin
>
> On Sunday, 26 September 2021 at 21:16:56 UTC+2 nice...@optonline.net wrote:
> Hello all,
>
> Does anyone have any knowledge of these packaged electronic circuits
> (PEC’s) that
>
> are used in VICTOR calculators with PANAPLEX displays? The VICTOR part number
> is
>
> shown in big numbers and the smaller number's significance is unknown. I have
> a unit
>
> that is missing the top-left segment (f segment) in all digit positions.
> Tracing backwards
>
> and comparing to working circuits, I believe the problem is originating at
> one of these PEC’s.
>
> There are 8 of these used to drive each segment plus the DP. Each also has 2
> digit
>
> drivers for the 16 digit display. This means each module serves three
> functions!
>
> Does anyone know of a source or have any that they would be willing to sell?
>
> I only need one but would consider multiples. I also would consider a
> boneyard calc that
>
> uses these. Thanks in advance for any help that you can offer.
>
>
> Rich
>
>
>
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