Problema NTSC ZENITH 16Z8C50

[marty59]

Originally Posted by miniman82

Looks like the local 3.58mhz oscilator is drifting to me.

I'd kinda agree to that except that color bars will run horizontally...maybe some B+ filtering or some sort of grounding issue around the burst amp/oscillator, something open?

[colortubeman]

First of all thank you all for giving me reply.
I think the problem lies in the stadium at 3.58 but the oscillator waveforms measured with the oscilloscope are the same as those described in the diagram I have schematic of mod.ZENITH 15V6C15.
The filtering of the B + I checked, also for safety I added one capacitor 450v 150mf in +B but nothing has changed.
The color is stopped that you can see how the pictures and does not move up and down of the screen.
is stable are different colors on the sides of the screen because maybe the oscillator operates at a multiple frequency of 3.58 what do you think?.
Unfortunately I need to reconstruct his original scheme of the model otherwise I can not understand it because something is definitely different from the drawing that I used now to restore it.
Please help me with original schematic ZENITH 16Z8C50.
Thanks again.

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[Steve McVoy]

Your set is in Sams folder 1074-3. You can buy it at:

https://www.samswebsite.com/