RE: 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

--James Bright
www.QuarterArcade.com
Restored Arcade Games for your Home

> -----Original Message-----
> From: owner-vectorlist@vectorlist.org [mailto:owner-
> vectorlist@vectorlist.org] On Behalf Of Mark Shostak
> Sent: Sunday, June 06, 2004 6:12 PM
> To: vectorlist@vectorlist.org
> Subject: Re: VECTOR: TECH: Tempest +5v line
>
> Not sure I understand this either.
>
> Why would you want to do this?
>
> -Mark
>
> On Sun, Jun 06, 2004 at 05:34:55PM -0400, James Bright wrote:
> >
> > He's probably referring to this sort of mod:
> >
> > http://tech.quarterarcade.com/tech/KB.aspx?g=1775&kb=2
> >
> > JB
> >
> > --James Bright
> > www.QuarterArcade.com
> > Restored Arcade Games for your Home
> >
> > > -----Original Message-----
> > > From: owner-vectorlist@vectorlist.org [mailto:owner-
> > > vectorlist@vectorlist.org] On Behalf Of Roger Smith
> > > Sent: Sunday, June 06, 2004 4:58 PM
> > > To: vectorlist@vectorlist.org
> > > Subject: Re: VECTOR: TECH: Tempest +5v line
> > >
> > > Peter Jones wrote:
> > > "you should replace the edge connectors and "lock" the AR2 to
disable
> > it's
> > > feedback circuit before doing anything else."
> > >
> > > I don't understand what is meant by"lock the AR2 to disable it's
> > feedback
> > > circuit". Thanks.
> > >
> > > Roger
> > >
> > >
> > > >From: "peter jones" <highwayman2000@mail.ru>
> > > >Reply-To: vectorlist@vectorlist.org
> > > >To: vectorlist@vectorlist.org
> > > >Subject: Re: VECTOR: TECH: Tempest +5v line
> > > >Date: Sun, 06 Jun 2004 20:28:56 +0400
> > > >
> > > >
> > > >-----Original Message-----
> > > >From: "Roger Smith" <whooshdoo@hotmail.com>
> > > >To: vectorlist@vectorlist.org
> > > >Date: Mon, 31 May 2004 15:02:52 -0500
> > > >Subject: VECTOR: TECH: Tempest +5v line
> > > >
> > > > >
> > > > > On my non-working Tempest UR there is 5.77v at J7 on the A/R
II
> > board
> > > >and
> > > > > 5.62v at the edge connector of the main board. Is this ok?
> > > > >
> > > > > Rog
> > > > >
> > > >
> > > >you should replace the edge connectors and "lock" the AR2 to
disable
> > it's
> > > >feedback circuit before doing anything else.
> > > >
> > > >otherwise you could end up with burned pcb's and a lot of dead
chips
> > > >eventually.
> > > >you are allready getting voltdrop from the edge connector and
it's
> > going
> > > to
> > > >get worse.
> > > >
> > >
>
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