Asteroids deluxe board issue

playpin35

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I have an AD that has a problem with the X output. The screen just has a vertical line in the right hand portion of the monitor. I put an asteroids board in and have a good full screen image so I know it's a board issue. Measuring the X and Y outputs I get the following readings:
X= -9.75V and Y 1.9-2.3V. What could cause the X output to have a reading of -9.75?
 
There are many reasons. If you have an oscilloscope you can debug easily starting with the output op and working your way back. If not, start at the ttl chips just before the analog section to see if the X output related TTL outputs are toggling. Really hard to debug from there without a scope.

Bill
 
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