Re: Strange issue with Cinematronics Clock Circuit

-----Original Message-----
From: Matthew Rossiter <matt@rossiters.com>
To: vectorlist@vectorlist.org
Date: Thu, 14 Jun 2007 15:15:15 -0700
Subject: VECTOR: Strange issue with Cinematronics Clock Circuit

>
>
>
> Normally this would seem like a pretty simple problem to fix, but
> I'm a little puzzled by this.
>
> http://games.rossiters.com/Cine-Clock-Circuit.jpg [1]
>
> I swapped out the two 74S113 flip-flops at H2 and G2 with new chips.
> The outputs at H2 pins 5 and 6 appear to be fine, but I can't figure
> out why pins 8 and 9 of H2 are stuck low.
>
> Does anyone have some ideas, based on the above diagram? Maybe 8
> and 9 are being pulled down by something, but I can't yet see what it
> might be.
>

pull g2 - it's inputs may be shorted to ground

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Received on Thu Jun 14 18:24:18 2007