Asteroids Arcade game vector issues?

[Macbeth]

Then of course the colour vector games like Tempest and Star Wars. I think I found Battlezone rubbish because I was too small to peer into that turret viewfinder and it ate all my pocket money! 

[TerraHertz]

Here's the scanned Atari Asteroids X-Y monitor service manual. Also those 'possibly from Atari' notes on the vector data format:
  http://everist.org/archives/scans/Atari_Asteroids/
    Asteroids_xy_monitor_service.zip  1.8 MB
    Asteroids_vector_notes.zip            2 MB
    Asteroids_self_test.zip                   376 KB

The manual is for the 14" and 20" models, as used by Leisure & Allied in Australia.
Models LAI-KZ-14XYB and LAI-KZ-20XYB.
Perhaps the same X-Y monitor would have been used in all markets? Since they weren't exactly a common thing.

It's a html doc. In case anyone looking at it doesn't realize, the in-line schematics and board layouts are large thumbnails. Click on them to see the full size pages.

[miguelvp]

Thanks TerraHertz.

We do have one at the office among others, and every now and then, they need to be serviced, this might help.
Yeah we do have an Arcade room

[RobII]

Another update.  Narrowed the problem down to a failing op amp.  I replaced and socketed all four of them and everything is rock solid once again.  Thanks for the manual scan/links and the help all.

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