Re: Clays AVG replacement PCB question

From: Jeffrey Matthews <spender1111_at_earthlink.net>
Date: Thu Jun 09 2011 - 20:57:39 EDT

Clay;
Thank you for your thoughts on my situation as well as the link for the instruction manual, much appreciated.
Jeff

On 6/9/2011 3:40 PM, Clay Cowgill wrote:

"jitter" is probably an 'analog' problem somewhere.  It sounds like the AVG is working correctly to me-- the LEDs are actually telling you that the AVG stack address is incrementing and the game is also sending the 'clear' signal.  The vector generator state machine on the board should appear to be running.

(More typically, AVG problems will be a game that crashes after certain graphic shape is drawn, or where the display goes 'crazy' with repeatable-- but wrong-- lines.)

Instruction sheet for the AVG replacement is here: http://www.multigame.com/137179.PDF

" There are two LEDs on the board (D101 and D102). D101 lights when the address “increment” signal is asserted inside the vector generator. D102 lights when the address “clear” signal is asserted inside the vector generator. These may be useful to experienced users to help debug a bad board. (In a working Star Wars board for example D101 will glow brightly and D102 will be significantly dimmer. If one or both are out, or too dim or too bright it will indicate a problem with that section of the AVG.)"

-Clay


________________________________

        From: owner-vectorlist@vectorlist.org [mailto:owner-vectorlist@vectorlist.org] On Behalf Of Jeffrey Matthews
        Sent: Thursday, June 09, 2011 4:58 AM
        To: vectorlist@vectorlist.org
        Subject: VECTOR: Clays AVG replacement PCB question
       
       
        Hi;
        I have a Gravitar that has a Clay AVG replacement PCB and the display is "jittery" and kinda jumbled.
        D102 on the AVG is bright but D101 dim, it is lit but much less bright that D102. I feel that this is an indication of a problem but do not have a clue as to what.
        Have any fellow collectors come across this before?
       
        I have a thread started here:
        http://forums.arcade-museum.com/showthread.php?t=187453
        With pictures.
       
        Thanks in advance
        Jeff
       
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--------------------------------------------------------------------------- ** 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 Jun 9 20:57:42 2011