asteroids vector monitor question

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

hi, i have a asteroids upright that i'm having a monitor issue with. At
least i think the problem stems from the monitor chassis not the
mainboard. The game sounds and runs fine but i cant see much of the
video as its all shifted to the right side of the screen (while standing
in front)..every now and then i will catch a glimps of a rock etc that
will come slightly into view but the little that i sometimes see kinda
looks distorted. Anyone have any ideas where i can check..
thanks in advance,
Jeff

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

thanks Kirb! i did also notice that the metal frame where some of the
transistors are mounted to was VERY warm, almost hot just after game
being on for maybe 5 mins.

tks again, Jeff

kirb wrote:
> jrd wrote:
>
>>hi, i have a asteroids upright that i'm having a monitor issue with. At
>>least i think the problem stems from the monitor chassis not the
>>mainboard. The game sounds and runs fine but i cant see much of the
>>video as its all shifted to the right side of the screen (while standing
>>in front)..every now and then i will catch a glimps of a rock etc that
>>will come slightly into view but the little that i sometimes see kinda
>>looks distorted. Anyone have any ideas where i can check..
>>thanks in advance,
>>Jeff
>
>
> could be a deflection transistor on the chassis, could be something on
> the defelction board, could be the analog section of the MPU. The easy
> things to check are the deflection transistors, then the MPU outputs
> (scope helps a ton), then the deflection board.
>
> oh, yea, reflow the solder on all the header pins on the deflector
> board since they are often a problem.
>
> Kirb
>

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

thanks for the tip, but the game was working well until recently..for a
short time before it got as bad as it is now, i could just tap on the
side of the cabinet and it would clear up..tapping the cabinet does not
do anything anymore

thanks

maximus@revisionx.com wrote:
> Try adjusting the pots for the X and Y on the game board itself. It
> could just be they're turned up high enough so that you're not seeing
> much on-screen at once. You won't hurt anything tweaking with them,
> and you'll get an idea of how each adjusts the image. It's not that
> uncommon - I fixed a "non working" Lunar Lander board that way once.
>
>
>
> HTH...
>
>
>
> On Wed, 14 Sep 2005 13:53:09 -0700, jrd <jrd426@hotmail.com> wrote:
>
>
>>hi, i have a asteroids upright that i'm having a monitor issue with. At
>>least i think the problem stems from the monitor chassis not the
>>mainboard. The game sounds and runs fine but i cant see much of the
>>video as its all shifted to the right side of the screen (while standing
>>in front)..every now and then i will catch a glimps of a rock etc that
>>will come slightly into view but the little that i sometimes see kinda
>>looks distorted. Anyone have any ideas where i can check..
>>thanks in advance,
>>Jeff
>
>

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

hello, well it turns out that i have a blown deflection transistor on
the chassis. its one of the 2N3792 in position q609. any ideas what
caused this to blow? wondering also if all 4 chassis mounted deflection
transistors should be replaced while i'm at it?..the monitor will need
to be removed from the cab to do this so i plan on doing a cap kit also
and anything else that makes sence to do while its out of the cabinet
thanks, Jeff

kirb wrote:
> jrd wrote:
>
>>hi, i have a asteroids upright that i'm having a monitor issue with. At
>>least i think the problem stems from the monitor chassis not the
>>mainboard. The game sounds and runs fine but i cant see much of the
>>video as its all shifted to the right side of the screen (while standing
>>in front)..every now and then i will catch a glimps of a rock etc that
>>will come slightly into view but the little that i sometimes see kinda
>>looks distorted. Anyone have any ideas where i can check..
>>thanks in advance,
>>Jeff
>
>
> could be a deflection transistor on the chassis, could be something on
> the defelction board, could be the analog section of the MPU. The easy
> things to check are the deflection transistors, then the MPU outputs
> (scope helps a ton), then the deflection board.
>
> oh, yea, reflow the solder on all the header pins on the deflector
> board since they are often a problem.
>
> Kirb
>

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

thanks Mike,
Jeff

syncbus@gmail.com wrote:
> If you buy the "deluxe" cap kit it will include the chassis transistors
> and it's a good idea to replace all four of them, there are two 2N3792
> and two 2N3716. Remember to use heat sink compound under the
> transistors, and test for no continuity between the transistors and
> monitor frame when you're done.
>
> A great repair reference is at www.ionpool.net
>
> Mike Doyle
>