Re: Asteroids problem....double images (fainter and to the right horizontally)

Solved - problem is one of the usual suspects - K5 74LS191. I suspect a
bad date code so keep an eye out for date code 8034 on 74LS191s @
location K5.

Thanks to (video problem 15 was somewhat like mine) the Asteroids
Troubleshooting Guide:

http://www.ionpool.net/arcade/asteroidtech/asteroidsrepair.html

John :-#)#

Andrew Welburn wrote:
> Have you tried some nice fast 2114 rams in the vram positions? slow
> rams often cause this behaviour, although i wouldn't expect the test
> mode to show any anomolies....
>
> also, a photo of the test mode would do wonders for further looking.?
>
> Andrew Welburn
> www.andys-arcade.com
> ----- Original Message ----- From: "John Robertson" <pinball@telus.net>
> To: <vectorlist@vectorlist.org>
> Sent: Thursday, March 04, 2010 5:25 PM
> Subject: VECTOR: Asteroids problem....double images (fainter and to
> the right horizontally)
>
>
>> OK, I'm getting lazy, but I'm wondering if anyone has seen a board
>> problem that causes double images horizontally?
>>
>> This is only shows in the text and rocks - but when you put up the
>> test screen the crosshatch is normal, and the vector test works
>> correctly as well (using Test and Diag switches).
>>
>> In the self test screen the dip switch 00000000 are echoed to the
>> right about 4 off and fainter. The "11" (coin setting) above shows a
>> single fainter "1" spaced to the right as well.
>>
>> In attract mode the screen has flicking text scattered around and the
>> CPU resets frequently. In test mode the display is static and the CPU
>> does not reset.
>>
>> Vector ROM and RAM substitutions do not change this result.
>>
>> I am about to pull out the Signature analyzing tools, but was
>> wondering if anyone has seen this one before.
>>
>> Thanks!
>>
>> John :-#)#
>>
>> --
>> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
>> (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
>> www.flippers.com "Old pinballers never die, they just
>> flip out"
>>
>> ---------------------------------------------------------------------------
>>
>> ** 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
>

-- 
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
                 www.flippers.com 
"Old pinballers never die, they just flip out"
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com