Atari BW XY Power followup question!

 Following up on this, the BW transformer assembly is NOT the same for all
 BW XY Atari games. The Battlezone and Asteroids assembly, though they
look alike, are not. The asteroids uses all 5 fuses on the block, and
battlezone uses 4. More significantly, the taps (if I remember correctly)
are like 30-0-30 on one and 40-0-40 on the other.

 Last time I checked the tolerances in the G-05 monitor spec basically
indicated that the asteroids assembly pushes the +-X% limits of the G05.

 Of course, you guys have more experience than I in swapping things in and
out. Comments?

                                Mitch

On Wed, 15 Apr 1998, TomW wrote:

> Gang,
>
> Have a question for you:
>
> I am restoring a starwars that was missing the power transformer assembly
> from the bottom of the cab. The game has an ampliphone monitor and I have a
> wintron flyback in stock to repair it so I would rather keep the
> ampliphone....
>
> So now here's the question. The original transformer drove the ampliphone
> monitor at 50VCT, I have several transformers from asteroids etc, but they
> put out 65VCT for the monitor. Now as I look at the monitor schematics, the
> HV section has its own regulators to drop it down to (If I remember right)
> +24,-24VDC so, I should be ok their. But, the deflection circuit draws from
> the unregulated +25,-25 VDC sections of the rectified 50VCT seconday's,
> which would now be around 32VDC with the asteroids supply. This variance is
> way out of spec for the ampliphone, which I think was %5 on the + going
> side, and %10 on the neg., and I'm afraid I'd fry the deflection circuit in
> the ampliphone... Any recommended modification to the deflection board ???
>
> Also this would lead me to believe that putting a non-ampliphone monitor in
> a SW would result in the monitor being under-driven, which I guess is
> compensated by turning up the XY gain on the game board, but as your AC
> line fluctuates your monitor could waver. But since no-one has ever
> mentioned it, maybe the electrohomes have a better tolerance for this type
> of thing.
>
> Any suggestions......
>
> Thanks
> TomW
>
>
>
Received on Wed Apr 15 12:18:41 1998