Proteus Posted December 24, 2015 Share Posted December 24, 2015 Any ideas. The link is to the YouTube video. It just started this. Thanks for any help! Quote Link to comment Share on other sites More sharing options...
Mef Posted December 28, 2015 Share Posted December 28, 2015 (edited) It's the RF modulator (the circuitry responisble for translating Atari video output into TV-antenna-grade signal) going out of expected frequency. I've had the very same thing with my C64 after messing around with the trimpots on the RF box, and some simple tuning back with a screwdriver did the trick. Which model do you have? How familiar are you with electronics? Edited December 28, 2015 by Mef Quote Link to comment Share on other sites More sharing options...
Proteus Posted December 29, 2015 Author Share Posted December 29, 2015 I'm pretty good. I have the Vader 4 switcher. What should I do? Quote Link to comment Share on other sites More sharing options...
Mef Posted December 30, 2015 Share Posted December 30, 2015 Well, shame on me... I assumed there would be a clearly visible screw-hole for adjusting the trimpots in the modulator itself, like in my C64. Turns out I can't see any opening ont he pics of Vader's RF box. If you're cool with opening the unit, you could try to locate it somewhere on the modulator (if it's there...), or gently try with the big orange one below the cartridge slot. It sure isn't the far-left one on the motherboard, as that's the one for color/hue. Either way, if everything else fails and noone can help you out, you can still try one of the A/V or S-video output mods around, so you'd never have to worry about tuning the TV in again. Plus the picture & sound quality is slightly better on A/V (not really noticable with properly shielded cables), and far superior on S-video. Hell, they've even made a mod for RGB output. Quote Link to comment Share on other sites More sharing options...
zylon Posted January 6, 2016 Share Posted January 6, 2016 Inside the little hole is an adjustment. it uses an allen key to do it. Other things that might cause that are a dirty or worn channel 2-3 switch. Quote Link to comment Share on other sites More sharing options...
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