Re: Star Wars 25 inch Amplifone issue

I have a Sencore CR-70 rejuvenator I got on eBay a few months back, but I've not
yet used it. I've not even read the manual. :-) Does it also test? If so, I'll
dig it out and try it.

Couldn't I also just check for a short with an ohm meter on the tube pins (with
the machine powered off and the socket disconnected, obviously).

You don't think it could be a short in the green drive circuitry on the
deflectinon board? We've not yet pulled it to check the transistors, nor have
we put a scope on the signal while the game is running.

Thanks for the suggestions. We'll looking into a possible CRT issue. If it is
a CRT issue, that will suck, as the 25" CRT is hard to find, and expensive.

___
Ken

On 09/11/2013 04:18 PM, Rodger Boots wrote:
> Heater-cathode short in CRT green gun? Don't suppose you have a CRT tester?
>
> On Sep 11, 2013 6:10 PM, "Ken Sumrall" <k_lists@scrapheap.net
> <mailto:k_lists@scrapheap.net>> wrote:
>
> The monitor on our Star Wars sit down machine at work is having issues. It
> started with an intermittent issue where the screen would suddenly turn
> green, and it was very bright and all the retrace lines were showing, and
> all the lines were out of focus. Smacking the cabinet would sometimes bring
> back a good picture. Then we also lost vertical deflection, so we opened it
> up to take a look.
>
> The deflection issue was easy to fix. We replaced a few transistors, and a
> fuse, and it was working again. The other issue we're still struggling
> with, in fact it's much worse, and is mostly in the bad state, with
> occasional flickers of it working correctly.
>
> We initially thought it was a bad connection in the CRT socket, as it seemed
> to change as I was poking the socket with a wooden stick. So I replaced the
> CRT socket harness with a spare one I had. That didn't work. So poked some
> more, and started to think there was a loose connection in the focus block.
> But then poking further didn't do anything.
>
> So, we started to suspect that something is just randomly working for short
> moments, and whatever I was poking when that happened made me think that was
> the issue.
>
> We are now wondering if maybe the green drive transistor is shorted on?
> That would explain everything looking green, and the retrace lines, and
> the brightness. Would that also explain the poor focus?
>
> Any other suggestions?
>
> Thanks!
>
> ___
> Ken
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Received on Wed Sep 11 19:28:09 2013