Re: Star Wars 25 inch Amplifone issue

I have a spare WG-6100 at home that I recently rebuilt. It's destined for my
Space Duel cabinet once I finish that project, but I was thinking of bringing it
in and seeing if the Star Wars game displays well on that. If not, then I'll go
looking at the game board.

I also have a Star Wars standup game at home, I could bring in that board and
see if it displays well on the monitor at work.

Thanks for the suggestions.

___
Ken

On 09/11/2013 05:00 PM, Douglas Gauck wrote:
> I know it sounds like a monitor/CRT issue, as I have similar symptoms - I occasionally lose all colors except for red, then objects show up fuzzy and with retrace lines. I would blame the monitor if I didn't have a working game boardset that proves the monitor is OK. Try game self-test or another vector source.
>
> -Douglas
>
> On Sep 11, 2013, at 7:28 PM, Ken Sumrall <k_lists@scrapheap.net> wrote:
>
>> 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 20:52:52 2013