Re: Tac/Scan problems

I'd first reseat all the boards in the card cage... check the
ribbon cable between the XY Timing and control boards...

After that, I'd try another XY timing and control board pair if
you have some around.

If you end up needing any boards, I have CPU and XY board pairs
for these games (you would have to bring over the CPU ROM and
security chip from your CPU board as I don't think I have specifically
Tac/Scan CPU boards).

-- Curt

>From: "Andy Welburn" <andy@andys-arcade.com>
>To: <vectorlist@synthcom.com>
>Subject: VECTOR: Tac/Scan problems
>Date: Fri, 31 Jan 2003 19:38:51 -0800
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>
>Hi all..
>
> We have a Tac/Scan here that we are trying to get going in time for a
>mini-meeting in the uk, .. I need some help, if anyone can be bothered :)
>I've done lots of work on 6100 and G05 stuff, but never touched a G08.
>Here's the problem:
>
>- machine worked fine for a while, game, sound, monitor, everything.
>- game started resetting, burned out +5v connector
>- connector replaced, game ran for aout 2 mins.
>- sat for 4 months in storage
>- plugged back in, +5v is 0.1v, all other voltages are ok..
>- replaced regulator (ua723) no difference.
>- gave up, took advice and wired in a pc power supply for the +5v, but used
>original Linear supply for all other voltages.
>- The game now runs, and the monitor now runs too, but i have graphics
>glitch :
>
>here are some pics :
>
>http://www.andys-arcade.net/Dcp07427.jpg
>http://www.andys-arcade.net/Dcp07428.jpg
>http://www.andys-arcade.net/Dcp07429.jpg
>
>you can see the game running, coin it up and play it, the sound has
>knackered now tho, but that might be something unrelated, not too worried
>for now.
>
>it looks like the pcb is shunting the beam around to the correct locations,
>but not sitting around and drawing the graphics, instead it stops and sits
>creating a spot... also, there is a nasty bright dot in the middle anyway...
>
>has anybody seen this problem before? If i could just isolate it down to
>which pcb in the cage is bad that would help a great deal, we have a spare
>boardset, but it seems to be pretty much completely dead.
>
>My thoughts were it has to be a math problem, not a monitor problem, not a
>bad dac, or bad op-amps, has to be something before that...
>
>anyway, i'm babbling, if anyone can help, let me know thanks..
>
>Andy Welburn
>www.andys-arcade.com
>
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Received on Fri Jan 31 12:42:33 2003