Tech:Asteroids

[Simon]

Archived from groups: rec.games.video.arcade.collecting (More info?)

I have an Asteroids that plays but all the graphics are really small about
1/10th normal size. I have tried it in another game and it is the same so
its not the monitor. Any ideas?

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

Well, it sounds like your x and y deflection outputs aren't producing
enough voltage... thus the electron beam is only painting a small
portion of the screen. I am not sure if this requires adjustment or
repair.. somehow that signal needs to get boosted. I don't know much
about vector repair, but I'm sure an expert will be along shortly!

Good luck,

Jude

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

Sounds like you may have a bad voltage regulator on your motherboard. These
power the output op-amps for the X and Y deflection circuitry. If one of
the voltage regs is bad, it will definitely affect any signals going through
the op-amps that depend on them.

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

>The whole screen is being drawn on its just everything is >very small.


You did try adjusting your x-y size pots, right? corner of the main
board below the edge connector. Did that do anything?

I would then check all the regulator chips for proper output voltage
(above the pot area).

Is this a new problem with a formally working board, or one you are
trying to fix?
Kirb

 

[Simon]

Archived from groups: rec.games.video.arcade.collecting (More info?)

The whole screen is being drawn on its just everything is very small.
"Matt J. McCullar" <mccullar@flash.net> wrote in message
news:Oxj4e.19041$DW.7102@newssvr17.news.prodigy.com...
> Sounds like you may have a bad voltage regulator on your motherboard.
These
> power the output op-amps for the X and Y deflection circuitry. If one of
> the voltage regs is bad, it will definitely affect any signals going
through
> the op-amps that depend on them.
>
>

 

[Simon]

Archived from groups: rec.games.video.arcade.collecting (More info?)

its one im trying to fix, yeah tried adjusting them but makes no difference.
"kirb" <kirbseepe@yahoo.com> wrote in message
news:1112728158.149254.28770@l41g2000cwc.googlegroups.com...
> >The whole screen is being drawn on its just everything is >very small.
>
>
> You did try adjusting your x-y size pots, right? corner of the main
> board below the edge connector. Did that do anything?
>
> I would then check all the regulator chips for proper output voltage
> (above the pot area).
>
> Is this a new problem with a formally working board, or one you are
> trying to fix?
> Kirb
>

 

[Andre]

Archived from groups: rec.games.video.arcade.collecting (More info?)

The way I read the problem it doesn't sound like a XY output circuitry
problem. Sounds more like a vector timing issue.

Andre
www.arcadesolution.com


"simon" <simonjhanlon@btopenworld.com> wrote in message
news:d2v15u$pd5$1@news7.svr.pol.co.uk...
> its one im trying to fix, yeah tried adjusting them but makes no
> difference.
> "kirb" <kirbseepe@yahoo.com> wrote in message
> news:1112728158.149254.28770@l41g2000cwc.googlegroups.com...
>> >The whole screen is being drawn on its just everything is >very small.
>>
>>
>> You did try adjusting your x-y size pots, right? corner of the main
>> board below the edge connector. Did that do anything?
>>
>> I would then check all the regulator chips for proper output voltage
>> (above the pot area).
>>
>> Is this a new problem with a formally working board, or one you are
>> trying to fix?
>> Kirb
>>
>
>

 

[Simon]

Archived from groups: rec.games.video.arcade.collecting (More info?)

Yeah I think so also, do you know what section of the pcb deals with this?
"Andre" <rhombus2@hotmail.com> wrote in message
news:AIE4e.2919$hg.782@news01.roc.ny...
> The way I read the problem it doesn't sound like a XY output circuitry
> problem. Sounds more like a vector timing issue.
>
> Andre
> www.arcadesolution.com
>
>
> "simon" <simonjhanlon@btopenworld.com> wrote in message
> news:d2v15u$pd5$1@news7.svr.pol.co.uk...
> > its one im trying to fix, yeah tried adjusting them but makes no
> > difference.
> > "kirb" <kirbseepe@yahoo.com> wrote in message
> > news:1112728158.149254.28770@l41g2000cwc.googlegroups.com...
> >> >The whole screen is being drawn on its just everything is >very small.
> >>
> >>
> >> You did try adjusting your x-y size pots, right? corner of the main
> >> board below the edge connector. Did that do anything?
> >>
> >> I would then check all the regulator chips for proper output voltage
> >> (above the pot area).
> >>
> >> Is this a new problem with a formally working board, or one you are
> >> trying to fix?
> >> Kirb
> >>
> >
> >
>
>

 

[Andre]

Archived from groups: rec.games.video.arcade.collecting (More info?)

Your best bet is to get a schematic of the board. But here is a link to the
section and some of my personal notes during test mode:

http://www.arcadesolution.com/technical/ast_vt.html



"simon" <simonjhanlon@btopenworld.com> wrote in message
news:d30lgl$rj4$1@newsg3.svr.pol.co.uk...
> Yeah I think so also, do you know what section of the pcb deals with this?
> "Andre" <rhombus2@hotmail.com> wrote in message
> news:AIE4e.2919$hg.782@news01.roc.ny...
>> The way I read the problem it doesn't sound like a XY output circuitry
>> problem. Sounds more like a vector timing issue.
>>
>> Andre
>> www.arcadesolution.com
>>
>>
>> "simon" <simonjhanlon@btopenworld.com> wrote in message
>> news:d2v15u$pd5$1@news7.svr.pol.co.uk...
>> > its one im trying to fix, yeah tried adjusting them but makes no
>> > difference.
>> > "kirb" <kirbseepe@yahoo.com> wrote in message
>> > news:1112728158.149254.28770@l41g2000cwc.googlegroups.com...
>> >> >The whole screen is being drawn on its just everything is >very
>> >> >small.
>> >>
>> >>
>> >> You did try adjusting your x-y size pots, right? corner of the main
>> >> board below the edge connector. Did that do anything?
>> >>
>> >> I would then check all the regulator chips for proper output voltage
>> >> (above the pot area).
>> >>
>> >> Is this a new problem with a formally working board, or one you are
>> >> trying to fix?
>> >> Kirb
>> >>
>> >
>> >
>>
>>
>
>

 

[Simon]

Archived from groups: rec.games.video.arcade.collecting (More info?)

Excellent thanks a lot Kirb
"Andre" <rhombus2@hotmail.com> wrote in message
news:8CS4e.2966$hg.1344@news01.roc.ny...
> Your best bet is to get a schematic of the board. But here is a link to
the
> section and some of my personal notes during test mode:
>
> http://www.arcadesolution.com/technical/ast_vt.html
>
>
>
> "simon" <simonjhanlon@btopenworld.com> wrote in message
> news:d30lgl$rj4$1@newsg3.svr.pol.co.uk...
> > Yeah I think so also, do you know what section of the pcb deals with
this?
> > "Andre" <rhombus2@hotmail.com> wrote in message
> > news:AIE4e.2919$hg.782@news01.roc.ny...
> >> The way I read the problem it doesn't sound like a XY output circuitry
> >> problem. Sounds more like a vector timing issue.
> >>
> >> Andre
> >> www.arcadesolution.com
> >>
> >>
> >> "simon" <simonjhanlon@btopenworld.com> wrote in message
> >> news:d2v15u$pd5$1@news7.svr.pol.co.uk...
> >> > its one im trying to fix, yeah tried adjusting them but makes no
> >> > difference.
> >> > "kirb" <kirbseepe@yahoo.com> wrote in message
> >> > news:1112728158.149254.28770@l41g2000cwc.googlegroups.com...
> >> >> >The whole screen is being drawn on its just everything is >very
> >> >> >small.
> >> >>
> >> >>
> >> >> You did try adjusting your x-y size pots, right? corner of the main
> >> >> board below the edge connector. Did that do anything?
> >> >>
> >> >> I would then check all the regulator chips for proper output voltage
> >> >> (above the pot area).
> >> >>
> >> >> Is this a new problem with a formally working board, or one you are
> >> >> trying to fix?
> >> >> Kirb
> >> >>
> >> >
> >> >
> >>
> >>
> >
> >
>
>