Re: Gravitar/Amplifone issue

The Pat 9000 is simply a substitute for a cabinet. It allows you to work on
or test a circuit board on your benchtop as opposed to messing around in the
back of a cabinet all stooped over. You start knowing you have a good power
supply and monitor. It even has built in self protections to keep a bad
board from cooking the test monitor. Some use a catbox with it for
diagnosis. I use a Fluke 9010A with the PAT 9000 to actually diagnose issues
with roms and RAMs. I've misplaced my space Duel Gravitar adapter though.
Its here in my workroom somewhere so I'll find it..

Typically amplifone problems won't keep the game from booting, however they
can damage the output items. Your symptoms sound like amplifone problems
since the XY voltages swing.
----- Original Message -----
From: "andre" <livnfree_can@yahoo.com>
To: <vectorlist@vectorlist.org>
Sent: Sunday, March 25, 2007 10:45 PM
Subject: Re: VECTOR: Gravitar/Amplifone issue

> What can you test on that? I have 2 Space Duels,
> unsure what wrong with them (I need to get a working
> Amp or 6100 going first which has been a nightmare)..
> one Battlezone, an Asteroids Deluxe, a Tempest
> (missing a Rom as board seems to have been harvested,
> but could put in a working rom if you could see what
> the rest of the board looks like), the Gravitar as
> well as 3 Omega Race pcbs. Does the PAT check beyond
> something bad or does it stop or hang up at the first
> thing it finds? Wondering if this sort of gives you a
> shopping list of what is wrong? This would be an
> awesome help as its getting expensive just buying one
> thing after another.
>
>
> I checked the X Y on the Gravitar and they do
> fluctuate. Could a problem in the Amplifone cause a
> problem in the pcb such as not being able to start a
> game?
>
>
> --- Mark Hooks <markhooks@earthlink.net> wrote:
>
>> Check the X and Y output voltages on the main CPU
>> board. I forget the actual
>> specs but it should be a variable DC voltage on both
>> of them. I think they
>> even swing from positive to negative at times. If it
>> is stuck on a
>> particular voltage then you have issues in the X,Y
>> output on the CPU board.
>> If not then I'd be looking at the Amplifone. If you
>> get desperate send me
>> your boards and I can test them on my PAT 9000, no
>> charge.
>>
>> Mark Hooks
>> ----- Original Message -----
>> From: "andre" <livnfree_can@yahoo.com>
>> To: <vectorlist@vectorlist.org>
>> Sent: Sunday, March 25, 2007 7:33 PM
>> Subject: VECTOR: Gravitar/Amplifone issue
>>
>>
>> > Swapped out the ram on my Gravitar board as it was
>> > giving 2 beeps on startup. Now I can coin up, hear
>> the
>> > sounds for credits, and the player buttons flash.
>> But
>> > I cannot start a game when I press the buttons.
>> >
>> > On the pcb all electrolytics have been replaced.
>> >
>> > On the Amplifone, a repair/cap kit was installed
>> along
>> > with a new flyback. All I get on the screen is a
>> very
>> > bright dot in the center (that I do not leave on
>> for
>> > more than a second).
>> >
>> > I swapped in a Space Duel (unknown if it works)
>> and
>> > bright dot came on, but every second or so there
>> seems
>> > to be a sort of pulse and lightning sort of lines
>> > radiate out from the dot.
>> >
>> > The blue cap has been replaced and electrolytics
>> on AR
>> > have been replaced...
>> >
>> > any ideas where to go from here?
>> >
>> >
>> >
>> >
>>
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>
>
>
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Received on Mon Mar 26 21:10:04 2007