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I realize that maybe I’m causing high current draw on the pic tube since I have all 3 g2 pots at max but the g1 is low.
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Well apparently sams was wrong because I referred to a Motorola book I have for the ts907 and it says to set g2 to mid point that’s alot less then all the way up as sams says. Well I hope I didn’t damage the flyback I did check the donut ohms it measured 586 ohms so I guess it’s ok.
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I got the color pattern to help assist, it was tough to tune it in but I did but regular tv has color bars just waiting to drop on to a picture . this IF business really sucks trial and error but the pattern started out with no color at all. Using a dvd with an rf modulator to the antenna terminals this is what I was able to get after adjusting but how much different is the antenna signal compared to the dvd signal.
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Well well well! That proves that each and every part of the set works.
Interestingly, the color bars from bottom up (orange up) are + and - I then - and + Q. Where does that test pattern come from? What DVD? |
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I found the original.
The image on your TV set has a seriously wrong "red" or "magenta" bar. The exact nature of the problem ... undersaturated ... is very frequently that the main video carrier is at an improper spot on the IF response slope. I strongly suspect that all your set now needs is a full IF and possibly but less likely also RF alignment, and getting the AGC working right. The AGC won't work right unless the video carrier is at the right spot on the slope. The CTC-5 at the ETF which I worked on last spring has the exact same problem. You seem to be a patient person. Its perfectly possible to align a TV with nothing but a plain signal generator and an analog voltmeter! Just use the bias box you already have to override AGC and meter at the video detector, plain DC. You can in a pinch even use the second harmonic of the oscillator of a SW radio, you just have to take into account of that oscillator's (typically 455 kHZ) offset from the dial. I've actually done that in a pinch! |
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By video carrier I mean the main carrier of the RF signal ... 1.25 MHz up from the
bottom frequency of the channel (at RF .... down from the top at IF). But if you don't already have something suitable as generator .... There's got to be somebody near you who can loan you one and show you even a bit how to use it. I'd do that if I were not 1000 miles away. Doug |
But if I was to get that pattern perfect color wise does that mean color in video would be good also.
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i got this a year or so back to align my BW Arvin TV. https://tinyurl.com/24atccvt |
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It's a multifunction RF signal generator that goes up to 60 mhz, does sine wave, square-wave, Triangle half, and many others, sine wave in the 40 mhz range is what is needed to do TV alignments with exact control. Which what this has be cause you can set the freq and amplitude.
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