Re: Asteroids no video

There has been a LOT of discussion on this matter here over the past few
months. You might want to check the vectorlist archive for more info. The
diode is getting a bit hard to find, but the HV unit is in the metal cage
on the left rear of the monitor chassis. You will need schematics and a
voltmeter to test the voltages coming out of it to see if it is working at
all. If it is putting out the voltages that are required, then you need to
find a replacement HV diode...check the archive for more info-extensively
talked about...

I believe a link to the archive can be found at http://www/spies.com/arcade

John :-#)#

At 07:38 AM 27-12-00, Dan Piraino wrote:
>I havnt had too much experience fixing HV failures, actually I havnt had
>any. I
>have only worked on circuit boards for the game. HV is located on the left or
>right side of the monitor chassis? I am thinking left. Can this HV diode be
>found anywhere else besides in a 70's B&W TV set.? Thats not something
>easy for
>me to find. Is it something that is not made anymore.?
>
> Dan Piraino
>
>John Robertson wrote:
>
> > That sounds like a HV failure. Often the HV diode. Condensation forming on
> > the HV lead might have drawn to much current through it. I would have to
> > wonder if this is the customers fault. After all you should NEVER plug in a
> > electrical device after it has been outside in the cold until it has warmed
> > up to ambient room temperature. Did the customer plug it in as soon as it
> > was brought in? There is the problem. The solution is to find out if the HV
> > cage is producing secondary voltages (400VDC and 90VDC come to mind) and if
> > so, then you need a new HV diode. If you find a B&W TV from the 70's it
> > should have this diode in it ready to be stolen and used in the game...
> >
> > John :-#)#
> >
> > At 04:09 AM 27-12-00, Dan Piraino wrote:
> > > I sold a game to a customer and after keeping it outside in his
> > >cold garage for three weeks he brings it in his house to play with it.
> > >It works fine for 20 games then the objects on the screen get really big
> > >and then the video goes out. There is game play and sound but no video.
> > >I believe something shorted in the board ,but what.
> > >Thanks,
> > > Dan Piraino
> > >
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Received on Tue Dec 26 16:15:14 2000