Re: WG6100 Problems (Please Help).

Have you installed the over-deflection safety circuit? This is the zener
diodes on the inputs to the monitor and are designed to limit the beam
deflection to the maximum the transistors can handle. This info is about
1/8th of the way down, titled:

Atari Color X-Y Display Deflection PCB

This might save the monitor from further blow-ups caused by the logic board.

John :-#)#

At 11:01 PM 10/17/1999 -0400, you wrote:
>Hi Jon (And others),
>
>I'm going to replace the fried resistors and reverse the upgrade. I
>pulled the
>Q704 transistor and it's fine. The Chassis transistors are new and were
>working
>before the "Upgrade". I'll be checking them again before the re-power up.
>
>The problem that prompted this was that at the exact same point in the game
>(Tempest), the spot killer would come on and it would look like the
>monitor was
>having problems with deflection. It would have a center spot that would
>draw just
>portions of the picture before the spot killer would kick in. The strange
>part is
>that many levels would play just fine, but certain ones would fail as
>would the
>TEMPEST logo in attract mode.
>
>It was suggested to me this weekend that the problem may be with my game
>boards in
>that the "op-amps" may be weak. The monitor may have been perfect. Any
>comments
>and suggested fixes? I may have another monitor coming to visit that
>would answer
>that question, but I'd still like to know.
>
>Thanks to everyone,
>
>-Al-
>
>Jon Raiford wrote:
>
> > I took just a quick look at a deflection board I have sitting here (read:
> > I didn't look at the schems). Do a diode check on Q704 and on the chasis
> > transistors. Also check to see if the chasis transistor casings are
> > shorted to ground. If nobody else suggests anything, I'll look at the
> > schems later tonight and see if anything else looks suspicious. If I
> > get really ambitious, maybe I'll measure some voltages on a known good
> > board to give you some places to check (maybe this would be a good kind
> > of thing to document for others to do a quick check when diagnosing
> > non-cap kit related failures?)
> >
> > Jon
> >
> > At 12:31 AM 10/16/99 -0400, you wrote:
> > >Hi Everyone,
> > >
> > >I installed the upgrades suggested in:
> > >http://www.gamearchive.com/video/manufacturer/atari/vector/html/zanen20
> 6.html
> > >
> > >after installing a Cap Kit in the same monitor. I did the "Extras"
> > >because my Spot Killer kept coming on at the same point while playing
> > >the game (Tempest). It was like it thought it lost signal.
> > >
> > >After installing the upgrades, I turned on the monitor and a few puffs
> > >of smoke and R709, R713, F700, and F600 are all fried. At least these
> > >things went wrong. I'm at a loss here folks. Any ideas?
> > >
> > >Please offer any advice that you might have about what to do from here.
> > >
> > > Thanks,
> > >
> > >-Al-
> > >
> > >--
> > > =====================================================================
> > >-= Al Warner batlzone@cyberenet.net =-
> > >-= Learn how to install a Cap Kit in your video game's monitor and =-
> > >-= see a whole lot more on my web page at: =-
> > >-= http://www.cyberenet.net/~batlzone =-
> > > =====================================================================
> > >
> > >
>
>--
> =====================================================================
>-= Al Warner batlzone@cyberenet.net =-
>-= Learn how to install a Cap Kit in your video game's monitor and =-
>-= see a whole lot more on my web page at: =-
>-= http://www.cyberenet.net/~batlzone =-
> =====================================================================

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Received on Sun Oct 17 23:00:53 1999