Quote:
Originally Posted by Adam
There is no vertical hold control, its all automatic.
I found the problem, remember I said in the last post it looked like there was a .68mfd capacitor where the schematic said there should be a 680. There's a picture where it divides the main board into a grid and then tells you which square each component is in. It said the 680 was in sections F-9 (where the 0.68 is), but it's really in section F-19. I replaced the real 680 and that fixed it.
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Great! A tidbit about the Zenith sync IC: it worked by looking for the whole vertical interval pulse pattern, and was so noiseproof it could sync on a signal so weak that you couldn't recognize the picture in the snow. The first models, though, expected only FCC standard sync and had trouble with video games until a redesign was done.