RE: Asteroids horizontal collapse after 20 mins or so

I am an engneer, although in networks and security, not electronics.
I can and have soldered together circuit boards with components from wire wrap, through-hole, and SMD.  I do shake a bit, so its not easy, but I have done it many times, even recently.  I have o-scopes, meters, and otherwise.  I haven't used an o-scope in decades, but I don't think it would be too tough to renew any simple knowledge I might have once had.  I can read a schematic, but I'm not a designer or even a technician, just a hobbyist.
I haven't tested components since my digital class in the late 80s, but I'm not afraid to.
I can discharge the tube if I need to (its not fun, but I don't think anyone thinks it is) with rubber gloves, a lamp cord and a screwdriver.  I don't have a tube discharge device.
I do have the original manual, and I believe the schematics as well, but I think they are downloadable on the net.
Does this help?
Kevin
________________________________
> Date: Sun, 27 Oct 2013 12:30:49 -0500
> From: js@cimmeri.com
> To: vectorlist@vectorlist.org
> Subject: Re: VECTOR: Asteroids horizontal collapse after 20 mins or so
>
>
> What kind of response are you hoping for? What is your level of
> electronics expertise?
>
> - JS
>
> Kevin Reynolds wrote:
>
> Greetings all,
> I decided to just take a chance and power up the asteroids cabinet, and it worked perfectly for about 20 minutes. After warming up, the video signal collapses horizontally (A vertical line in the center of the screen with different levels of brightness (guess the signal is stacking where ships, asteroids, and other video output is displayed). If I shut the system off and let it sit for a bit, it works perfectly again. Before the video collapses, I can see some very slight wavering of the screen at the edges, but its nearly inperceptible.
> Any cues on what I should look at? Other than this problem, it seems like everything is working. Audio is working (although the speaker might need tightened, its a bit raspy), the buttons work. I have it on free play, so I don't know if the coin mech is working. This coin mech is the original circular model. In fact, I'm pretty sure this game is the original version, without the copyright date on the display.
> Thanks all,Kevin
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Received on Sun Oct 27 13:40:05 2013