Re: Star Wars 25 inch Amplifone issue

You may also want to try checking the brown zero ohm jumpers on the deflection board. I replace these with straight 18 gague wire. I had similar symptoms on an Amplifone that was in my Gravitar a long time ago, turned out to be one of the jumpers failing. Hope this helps.

Michael Kelley

-----Original Message-----
From: Ken Sumrall <k_lists@scrapheap.net>
To: vectorlist <vectorlist@vectorlist.org>
Sent: Wed, Sep 11, 2013 8:53 pm
Subject: Re: VECTOR: 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
>>> ------------------------------__------------------------------__---------------
>>> ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
>>> ** Please direct other questions, comments, or problems to
chris@westnet.com
>>> <mailto:chris@westnet.com>
>>>
>> ---------------------------------------------------------------------------
>> ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
>> ** Please direct other questions, comments, or problems to chris@westnet.com
>
>
> ---------------------------------------------------------------------------
> ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
> ** Please direct other questions, comments, or problems to chris@westnet.com
>
>
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com

---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Thu Sep 12 00:01:03 2013