Re: Dodgy Sprint2 PCBs

-----Original Message-----
From: "Joel Ricci" <joel@ricci.se>
To: <rasterlist@vectorlist.org>
Date: Sun, 1 Oct 2006 23:12:29 +0200
Subject: RASTER: Dodgy Sprint2 PCBs

>
> Hi!
> I recently picked up two Sprint2 machines that need some work. Both PCBs
> have had a AC/DC Regulator bypass operation and one board has a burned TDA
> 1004 audio amplifier. So, now I've pulled them out of the cabs and hooked
> them up to a test monitor and supplying DC 5v directly onto the board
> (ignoring the 16 and 25VAC part) and both PCBs produce a nice picture
> consisting of random characters. They sometimes actually have cars jumping
> around among the random characters, especially if I pull out some ROMs.
>
> Someone told me that Sprint2 PCBs wont run out of the cabinet unless the
> Coin switch pins are grounded on the PCB so I tried that aswell, but to no
> avail.
>
> My questions are:
>
> * What would a working PCB show when just applying the 5V without the
> cabinet harness attached?
probably what you see,
most old atari stuff either had no onboard cpu-reset generator, or it was derived from one of the higher voltages.

check the cpu reset pin.
(and download a scematic/cab diagram)

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Received on Sun Oct 1 18:20:47 2006