Re: Asteroids no video

    I have received word from the customer( I dont have the game with me)that when
he wiggles the wire connection to the HV unit he gets video back then after a
little bit every object gets really big and video goes out again. Possibly a bad
solder connection?

John Robertson wrote:

> Yes, in the B&W Vector games the tube filament power came from the main
> game transformer, not from the HV section as on Raster based games. So a
> glowing filament means you have power in the cabinet only. Do you hear the
> noise of squirrels in a tin can when you put your ear near the neck of the
> picture tube? If so then the board and deflection circuits should be OK,
> and we are left with the HV unit, again...
>
> John :-#)#
>
> At 09:44 AM 27-12-00, Dan Piraino wrote:
> > Would the end of the crt glow if it was an HV unit failure?
> >
> >John Robertson wrote:
> >
> > > 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 Wed Dec 27 00:24:58 2000