Re: Star Wars PCB jitters

I watched the videos and there's not just jitter. There are definitely graphical errors occurring as well.
My first advice would be...

1) verify all EPROM chips if you have the means,
2) swap the AVG chip with a known good spare,
3) very carefully re-seat all socketed chips on the game boards.
4) verify that the chips on the game board are getting +5.0 VDC +/-0.1V.

William Boucher
http://www.biltronix.com
  ----- Original Message -----
  From: Steven Winslow
  To: vectorlist@vectorlist.org
  Sent: Monday, November 12, 2012 2:33 AM
  Subject: VECTOR: Star Wars PCB jitters

  I've had this STAR WARS for over 10 years. The Amplifone deflection and HV board was rebuilt/recapped and all recommended mods were done. Running on a Wintron transformer. I'm beginning to believe this problem is on the game board itself since I've swapped in different deflection boards and HV boards with no change.

  This seems to be a very common problems with all SW boards so I'm wondering what resolution people have found for this problem. BTW - the jitter is more severe at the bottom of the screen which is where I'm pointing the camera but it can be seen in the entire picture. The other not so severe areas seem to be pulsating or jumping slightly. I've read lots of posts with similar issues but haven't read any definitive resolutions. What do you think I should check?

  I just recently replaced the 10k sizing pots on the deflection board. No change. Big blue cap was replaced long ago also....

  Thanks in advance for your advice. Here's a couple videos showing the jitter:

  https://www.dropbox.com/s/xf3lpckvv9...%2026%20PM.mov

  https://www.dropbox.com/s/ggbgdme3gf...%2057%20PM.mov
     

  Regards,

  Steven Winslow

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Received on Mon Nov 12 17:30:05 2012