G05-802 vertical squished

tng25

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My Asteroids Deluxe is having an issue with the vertical size on the G05-802 monitor. 3 of the linearity pots are able to make adjustments and work as expected, however R602 has no effect when turned throughout it's entire range. R602 has been acting flaky for a while and finally stopped responding to adjustments, so I replaced it and the new one also has no impact on picture adjustment so the issue must be something else. Any ideas? See screenshot.

Thanks for any input!
 

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Probably not the best solution, since there may be a problem with your chassis, but have you tried adjusting the Y Gain pot on the game PCB? You might be able to compensate by increasing that a little bit. Otherwise, maybe the FAQ has some useful info: http://www.crazykong.com/tech/bw_vector_monitor_faq.pdf .

DogP
 
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