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  #256  
Old 08-19-2017, 08:57 PM
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Originally Posted by old_tv_nut View Post
Are these components on a PC bOard? Maybe a bad solder joint? Try bridging a resistor directly across the coil?
All point to point wired. Resistor did nothing. I think I will just get the color set up and worry about this later, maybe I'll think of something while Im doing that.
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  #257  
Old 08-19-2017, 09:11 PM
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Now on to the color for now. Everything seems to be fine except for colors with magenta. As you can see the magenta bar fades off into red which I attribute to bad phasing in the G-Y(?) channel. I just am not sure how I would fix it (Phasing adjustment?).
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  #258  
Old 08-19-2017, 09:45 PM
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Originally Posted by SwizzyMan View Post
Now on to the color for now. Everything seems to be fine except for colors with magenta. As you can see the magenta bar fades off into red which I attribute to bad phasing in the G-Y(?) channel. I just am not sure how I would fix it (Phasing adjustment?).
it really would help to put a scope on the R-Y, G-Y, and B-Y outputs to see which ones are smeary. It may be the B-Y amp. If all are smeary, it may be a chroma alignment or even IF alignment problem. How is it affected by fine tuning?
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  #259  
Old 08-19-2017, 09:48 PM
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Originally Posted by old_tv_nut View Post
it really would help to put a scope on the R-Y, G-Y, and B-Y outputs to see which ones are smeary. It may be the B-Y amp. If all are smeary, it may be a chroma alignment or even IF alignment problem. How is it affected by fine tuning?
Doesnt seem to be affected by fine tuning at all.
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  #260  
Old 08-19-2017, 09:55 PM
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Doesnt seem to be affected by fine tuning at all.
Then you can cross IF alignment off the list.
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  #261  
Old 08-19-2017, 09:58 PM
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Then you can cross IF alignment off the list.
Thank god. I will have to hook up the scope tomorrow.
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  #262  
Old 08-20-2017, 09:29 AM
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Using the scope proved inconclusive, I couldnt get the scope to lock on to any trace coming from the demod tubes. The trace wasnt stable enough to get any pictures of it without it being cut off. Hmm, should I just try a color set up per the manuals instructions?
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  #263  
Old 08-20-2017, 01:25 PM
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Interesting the worst smear is between magenta and green. This color transition is the greatest phase swing. This suggests that the chroma channel response is bad.

The chroma response of the later (CTC4 on) sets is dependent upon a good complementary video IF and chroma channel response.
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  #264  
Old 08-20-2017, 03:34 PM
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Interesting the worst smear is between magenta and green. This color transition is the greatest phase swing. This suggests that the chroma channel response is bad.

The chroma response of the later (CTC4 on) sets is dependent upon a good complementary video IF and chroma channel response.
Second this, but seeing it at both demodulators would confirm it.

SwizzyMan, what kind of scope do you have? If it is capable of syncing on a separate signal from the one you are viewing, it's good to know how to do that for future reference. You could sync on the luma, the sync separator stage, or just by putting a probe somewhat near the flyback (not too close!), and then look at whatever you wanted with the other input.
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  #265  
Old 08-20-2017, 04:40 PM
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Originally Posted by old_tv_nut View Post
Second this, but seeing it at both demodulators would confirm it.

SwizzyMan, what kind of scope do you have? If it is capable of syncing on a separate signal from the one you are viewing, it's good to know how to do that for future reference. You could sync on the luma, the sync separator stage, or just by putting a probe somewhat near the flyback (not too close!), and then look at whatever you wanted with the other input.
Its a tektronix TAS 220. 20 mhz analog scope, not the greatest but it normally works.
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  #266  
Old 08-20-2017, 05:12 PM
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Its a tektronix TAS 220. 20 mhz analog scope, not the greatest but it normally works.
Nice little scope - you can trigger on channel 2 and poke around with channel 1.
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  #267  
Old 08-21-2017, 07:41 PM
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Can't seem to get the scope to trigger. I really need to look for a better one here soon anyway. I'll keep messing with it, maybe I can get it to trigger.
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  #268  
Old 08-21-2017, 07:58 PM
Bill R Bill R is offline
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What I see is video ringing in the earlier picture. Looks like you were on the right track with the peaking coils and such in the last video and IF strip. The color problem is what we used to call poor color fit. More often than not it is caused by a problem or poor alignment of the IF strip. I would set up to do an IF sweep alignment and see what the response curves look like. A proper IF alignment may solve both problems. I will bet it is off more than you think.
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  #269  
Old 08-22-2017, 04:50 PM
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Sounds like an alignment is in order this weekend. Unless I can do it with the chassis on the bench with no hv or crt.
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  #270  
Old 08-23-2017, 07:45 PM
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Uh, that's how you're supposed to do it...

Read the alignment instructions, or better yet if you have a B&K 415 use that it'll cut your time in half.
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