RE: Atari BW XY Power followup question!

Don't know for sure what the difference is. But I do know that I have run a
BZ boardset off of an Asteroids power supply.

David

> ----------
> From: Mitchell Rohde[SMTP:bovine@eecs.umich.edu]
> Reply To: vectorlist@spies.com
> Sent: Wednesday, April 15, 1998 12:15 PM
> To: vectorlist@spies.com
> Cc: TomW; Mitchell Rohde
> Subject: 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 13:13:25 1998