Problema NTSC ZENITH 16Z8C50

[ctc17]

That is defiantly purity, its an adjustment not something you need the schematic for. It comes from moving the set around.
First check the degaussing circuit and make sure you have no magnetic sources nearby like big speakers.
I can make a video on how to check and adjust the purity later, i have a zenith here that needs it bad.

[colortubeman]

high purity and controlled using only the white raster with red cannon.
I have also demagnetized with an external demagnetizer.
The problem is that I have reconstructed on the circuit and without the layout of the model can not run well.
Surely theres a problem on the piloting of the burst may signal the horizontal oscillator is not ok.
I've tried in many ways even with capacitors applied but you get only a mismatch of color, but the problem remains.
I'm sure that if I do well in the scheme just to make it work maybe some else is missing capacitor but I can not figure out where.
I copied the scheme to rebuild it is another model of ZENITH and certainly is different even if the valves fitted.

[marty59]

Just an observation for us here trying to be helpful..Look close at the screen shots and see the wavy pattern that all the colors are following? If it was just a purity issue the screen "impurities" would be more "blotchy" with no real pattern. See what I mean or am I off here?

I believe the initial approach would be to observe the screen with no signal input what-so-ever and see what we have. What does a blank raster look like? And the color turned down all the way/off.