Quote:
Originally Posted by Chris K
OK...now that might be something...can I blame Bob Andersen? (JUST KIDDING!!!). We are talking about adjustment to the horizontal sweep oscillator? When I watched Bob's restoration of one of these 721s, in an effort to get something reasonable on the CRT, he practically bottomed out the core of L121 so I figured what the hell??? It was part of how I managed to get a picture originally and I know it's nowhere near the original position, although I didn't bottom it out. How would one go about adjusting L121 and the resonance with the flyback?
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Back on your post #33 it sure looks like you had the horizontal locked(not rolling). Unless you've readjusted L121 since then it's not likely your problem. I haven't looked but Sams generally has instructions for adjusting the horizontal freq. Unless you have a scope or frequency counter that you know how to use it'll have to wait until you have the CRT back in. You ultimately are the best judge of what you tampered with since you had it working.