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  #31  
Old 02-17-2019, 05:05 PM
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Quote:
Originally Posted by oldtvman View Post
If you have the schematic and it appears you do, it should show waveforms for different points of the set. I know Sams has waveform pictures based on using a color bar generator.
Even if he doesn't the ETF has the CTC-16 sam's in free PDFs on it's site.
http://www.earlytelevision.org/tv_sc...ams_color.html
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  #32  
Old 02-17-2019, 05:21 PM
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That chassis may have lots of cold joints. Like tube sockets, common.
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  #33  
Old 03-10-2019, 07:56 PM
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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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  #34  
Old 03-26-2019, 12:39 AM
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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.
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  #35  
Old 03-26-2019, 05:29 PM
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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.
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  #36  
Old 03-26-2019, 06:32 PM
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Originally Posted by Jon F View Post
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.
Have you tried adjusting the AGC?
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  #37  
Old 03-26-2019, 09:40 PM
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I’ve done the horizontal setup twice and adjusted the AGC
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  #38  
Old 12-07-2019, 02:08 PM
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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?
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File Type: jpg 31E512C6-A02F-42DF-9FD7-9E001280EA03.jpg (81.3 KB, 43 views)

Last edited by Jon F; 12-07-2019 at 02:10 PM. Reason: Image fix
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  #39  
Old 12-07-2019, 04:46 PM
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Quote:
Originally Posted by Jon F View Post
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?
I get that too ( very slightly ) no idea what it is...
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  #40  
Old 12-07-2019, 05:38 PM
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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?
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