Pin 1 of horizontal oscillator has a .5 cap that was 100v but I had put in a .5 630v would this make a noticeable difference. Pin 2 1v but I get 0v and pin 1 .5v I’m getting -7.0v

what cap # is that on the SAMs? :O

C81 but the sams don’t show it in the arrows to identify where it is but it’s there. Another typo

Shown on the picture on page 5.

jr

SAMS shows it to be between r119 - r121 and has a tie to ground with r120.

thus I was a bit confused when you said "Pin 1 of horizontal oscillator has a .5 cap" to me that meant C78, :O

It would be helpful if you gave part numbers from the SAMS to make it more clear :P

that part of the circuit is for sinewave shaping, the larger value volt cap should not matter, BUT value and type WILL.

Yes that was my mistake sorry about that it was not exactly pin 1.

I had put a new flyback in this set whos to say it may be bad in some way or defective I would hate to put the old one back in to see if this helps.

well, until you find someone with an oscilloscope, or are able to get one, you are quite limited.

Username1 mentions that the horizontal oscillator of course is not running correctly and that it don’t seem to have the punch behind the oscillations which makes sense so if there are no resistors bad and voltages are present then the only thing left is caps oscillator coil which checks out fine and flyback the hots were changed as well. Right now I don’t have a scope so I’ll need to push on without it for the moment. And of course if the flyback is good caps make the proper speed and shape of the signal.

There are 2 560pf caps in the yoke what are some symptoms of a bad yoke.

Well I’m not one to give up but it’s altogether and still low hv pulling the 145 190 275 voltages down is it possible there is a problem in the panel that has the g1 control and the red green blue controls. I’m not finding any reason for this voltage to drop and I believe this is affecting the horizontal drive low voltage low or no horizontal drive. It needs 190v and 275v and they drop to far to support the oscillator.

What is a good low esr power supply cap 450v 100uf I have 2 sprague caps in the series circuit and that voltage stays up 385-390v but the other caps that supply 145 190 275 have got to be bad even though my cap checker shows good but in circuit they may be breaking down.

If you have replaced them already, you have virtually nothing to gain by replacing them again at this point, the problem is someplace else.

C3A, C2B, C3B, C2C,
https://www.mouser.com/ProductDetail...nVkrybSw%3D%3D

https://www.mouser.com/ProductDetail...j1prphYw%3D%3D

https://www.mouser.com/ProductDetail...K8MOO7xA%3D%3D

prob replacements.

“low esr” caps are really not the right kind for this area, and hard to find in the values needed, General Purpose Electrolytic Capacitors will do just fine here.

ok I thought low esr caps were better I can’t imagine where this pull is coming from what is it in this set that’s going to pull 3 voltages down I did nothing to this chassis to suggest a major mistake and I can bet it’s the horizontal oscillator alone pulling everything down while still having hv even though it’s low.

a lot of reading about the subject.
https://www.avnet.com/wps/portal/aba...ic-capacitors/

Where it comes into play is higher frequency buck converter type power supplies, but in vintage stuff like this, it would really not help much at all at 60hz line inputs.