----- Original Message -----
From: Ethan Dicks <ethan_dicks_at_yahoo.com>
To: <classiccmp_at_classiccmp.org>
Sent: Tuesday, April 10, 2001 1:21 PM
Subject: Re: Kim / Commie keypads
>
> --- Richard Erlacher <edick_at_idcomm.com> wrote:
> > It's pretty hard to tell whether it's the keypad or the circuit that's
> > malfunctioning. How did you determine it's the keypad itself?
>
> Looking at the schematic, it appears to be a simple matrix. Short a
particular
> X and Y line for the questionable key. If it "strikes", it's the keypad.
> If it still flakes out, it could be a component or trace.
>
Right. It's a 3 x 7 array with 2 keys wired to a 556 for ST (step) and
RS (reset).
I've already tested the broken keys via the edge connector, and they're
working fine. Not that there was too much doubt, as the buttons
involved are either caved in or "feel like they're not connecting
with anything". So a 3x7 + 2 switch setup should do the trick,
but what would look good.
> -ethan
>
>
> =====
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>
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Received on Wed Apr 11 2001 - 02:17:02 BST