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As mentioned before, clean all the controls including chromatic and the service switch. THen replace the vert module. There was an updated version that is a direct replacment for the original, although I do not recall the number. As for shutting down, I'm not too sure where to start on that. i do remember that if the vert sweep fails, the raster will blank to prevent a burn line into the screen. This had alot of techs confused.
Don't forget to check to see if this has the terrible White four-lead cap. This was part of the HV regulation IIRC, and can destroy the CRT with excessive HV if not attended to. I'm not sure if that particular year is affected, but its always good to look. If you see a orange 4 lead cap at the bottom of the HOT heatsink or have two ceramics underneath the heatsink, you should be fine.
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Jordan
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