Re: Another 19v2000 ?

That sounds ODD to me... as afaik, the spot killer derives its input from the Yoke signal feedback to the amplifier circuit.... unless I'm barking up the wrong tree ?

Whats the Power Look like then ?

If you unplug the Asty PCB, and power up, does the spot killer come on then ???

Cheers, Colin
  ----- Original Message -----
  From: Kevin Moore
  To: vectorlist@vectorlist.org
  Sent: Friday, January 08, 2010 1:42 PM
  Subject: Re: VECTOR: Another 19v2000 ?

  There is no chatter :(

  I was thinking it would be in the spot killer out Z amp sesction, but have yet to find anything.. I'll keep digging..

  And yes it is an Asteroids boards. :)

  Kevin

  On Fri, Jan 8, 2010 at 4:45 AM, COLIN DAVIES <colin.w.davies@btopenworld.com> wrote:

          You say you have no deflection, but can you hear the Yoke Chattering ? (Odd that the spot killer is off) - If so I'd say check the spot killer output , Z amp section and brighness/contrast..

          Are you using an asteroids board to test it ? - I've found the beam spends a bit of time in the middle of the screen when not drawing, giving me dots in the middle on poor screens you see....

          Cheers, Colin

          --- On Thu, 7/1/10, Kevin Moore <talon.k@gmail.com> wrote:

            From: Kevin Moore <talon.k@gmail.com>
            Subject: VECTOR: Another 19v2000 ?
            To: vectorlist@vectorlist.org
            Date: Thursday, 7 January, 2010, 23:54

            Ok, I've got a 19v2000 that out of the blue just started producing a single dot middle of the screen.

            Spot Killer LED is off, (yes it works)

            But getting no X Y deflection.

            I've read somewhere that cause was probably q503, and 504. Checked and replaced both with good known. No help.

            Can swap with another deflection board, and it works fine. So game board doesn't seem to be the problem.

            Kevin

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Received on Fri Jan 8 16:55:28 2010