[sdiy] SSM Question

[Trevor Page]

Hi,

A buzz box? I presume you mean a continuity tester.

It depends upon how low a resistive load your tester expects to see across
it's terminals to give a positive reading. What you're seeing probably just
means that, with some ICs present, there is now a path of sufficiently low
resistance (which might still be relatively high) for your tester to 'buzz'.

In any case, it's probably not good practice to probe around circuits with a
continuity tester in this manner. It might be capable of sourcing enough
current to cause further damage to semiconductor devices on the board.
(Someone correct me if I am wrong!)


Trev



----- Original Message -----
From: "Tim Curtis" <sexsymbol at execpc.com>
To: "Synth DIY List" <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, November 13, 2001 11:03 PM
Subject: [sdiy] SSM Question


> Hi Everyone -
>
> I'm in the process of trying to resurrect a Rev. 2 Prophet 5, and I have
> a couple of questions regarding the SSM chips.
>
> If I put a buzz box on the voice board power terminals I get a buzz if
> some of the SSMs are on board.  Does this mean that they're likely
> shorted out, or is it a property of the chips?
>
> Also, can anyone recommend some simple (I'm a moron) circuits that I can
> use to test out some of these SSM 2020s, 2030s, and 2040s?  I've got
> some extras here but I don't know if they're good or not.
>
> Thanks,
>
>
> Tim
>
>
>
>