#31
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Quote:
http://www.earlytelevision.org/tv_sc...ams_color.html
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#32
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That chassis may have lots of cold joints. Like tube sockets, common.
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#33
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Most of the time when I had this problem I would always check the plate voltage on the chroma tubes and usually sure enough, one of the shielded coils would be open and that would kill the color. Many times you can fix the coil due to a bad solder joint on the coil.
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julian |
#34
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Hi all, I've been a little distracted at work lately. However I have since bought a blonder tongue RF modulator and this has helped the color sync much easier.
I am still have issues with waviness at the top of the image. Same whether is the line generator, or laserdisc player. Next step is to pull the chassis again and reflow many connections. |
#35
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May want to scope your H sync line and see if it is clean/strong or noisy/weak. If noisy focus on sync sep, if clean focus on H AFC diodes/components around them, osc, and feedback from the fly...
I assume you've followed the sam's horizontal setup procedure for your chassis...If not please slap your forehead, then do it.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
Audiokarma |
#36
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Have you tried adjusting the AGC?
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#37
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I’ve done the horizontal setup twice and adjusted the AGC
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#38
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I finally pulled the chassis and reflowed the connections on the sweep board. This fixed the issue. I visually found 2 that weren’t connected.
I am still seeing 2 things, 1) “Contrast” streaks as shown in the picture 2) The image slightly waves left & right. Almost not noticeable. Maybe something isn’t grounded? Any thoughts? Last edited by Jon F; 12-07-2019 at 02:10 PM. Reason: Image fix |
#39
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Quote:
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために |
#40
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I have no sure ideas, just some random thoughts on looking for the streaking.
1) Does the streaking change if you adjust fine tuning? (would indicate problem in IF) I'm guessing not. 2) does the streaking change when you exercise the video peaking switch? 3) check voltages in the video stages 4) is the capacitor on the video output screen grid (schematic not clear, but looks like .22 uF) OK? |
Audiokarma |
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