Re: Tempest Problems...

Take a look at the outputs of the voltage regulators
on the deflection board and see if they aren't
changing voltage with load (or just plain not at
the right voltage to start with).

Dave Downin wrote:

> Greetings,
>
> I've been having a problem getting my Tempest machine working properly. I
> have installed a new picture tube (from Richardson), a LV2000, and a "get well
> kit" on the monitor. It looked pretty good after I first fired it up...just
> needed to re-converge and set the purity on it. So I went to make the
> adjustments and blew some stuff up. I missed the ground wire to the HV cage
> (that should have been screwed to the chasis) and it apparently brushed up
> against something. I know because it took C901 & 902... I replaced them and
> have gone over the HV cage, and the deflection board checking all the
> transistors (the chasis mount ones too) and diodes. So, I think the monitor
> is not my problem now...although I haven't COMPLETELY ruled it out. Oh yeah,
> I also noticed that R106 had opened up on the deflection board so I replaced
> it as well.
>
> What I'm seeing is that all the text is now slanted and the bottom and top of
> the screen is somewhat bowed. I've got screenshots of all the test screens,
> as well as the playfield, and some scope readings I took on the game board
> outputs (on the test screen with the plain white border). The screenshots are
> at:
>
> http://www.smart.net/~downin/tempest/
>
> I retouched all the solder joints on both the interboard connectors and on all
> the caps in the AVG section. Unfortunantly I don't own a spare monitor or
> boardset for the machine, so I can't swap anything out. Any ideas or
> suggestions would be greatly appreciated!
>
> --
> Dave Downin (dave@arlo.net)
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Received on Tue Feb 2 14:08:40 1999