Re[2]: TECH: Tempest +5v line

-----Original Message-----
From: "James Bright" <james@quarterarcade.com>
To: <vectorlist@vectorlist.org>
Date: Sun, 6 Jun 2004 19:48:04 -0400
Subject: RE: VECTOR: TECH: Tempest +5v line

>
>
> It is what is it. "Atari's Audio Regulator II board uses +SENSE and
> -SENSE to help regulate voltage on the power supply. Unfortunately, bad
> connections can sometimes cause invalid return values and affect voltage
> reading."
>
> Bad connections at the edge connections, or connectors that get dirty
> over time, cause increased resistance. The ARII board tries to
> compensate (using the + and - SENSE lines) and supplies more voltage.
> This can lead to burn out of R29 (I've actually witnessed this happen in
> a game that was working moments before). I am sure I've seen a more
> detailed explanation before, but I just wrote down what I needed for my
> notes. Simply removing this feedback helps prevent the burnt edge
> connector. At worst, you might (eventually) have a lower +5V line. But
> what you're really doing is avoiding burning up R29 and the melting the
> edge connector.
>
> JB
>

unless your very unlucky,

the 5v and ground signals use multiple contacts, the feedback doesnt.
if you get bad connections on the feedback the voltage will rise way above 5v.

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Received on Sun Jun 6 21:48:16 2004