Where is the Screen Focus on a Sega Astro City....

JRedmond3

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Complete Arcade Machine noob here, I've cleaned up the astro city I got and the screen looks good but I'd like to increase the focus a little if possible. I know where the RGB/Vertical/Horizontal hold controls are but I can't find the focus, which I don't have a screwdriver for the screw on the back panel so I can't really look at the flyback.
 
focus should be on the flyback....

Yep yep. Got a few of these at the arcade. It's on the flyback, top pot IIRC... I get those mixed up a lot, but it should be the top, and the bottom should be brightness. ... Get a handheld mirror to see the screen, you'll need it.
 
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