Ts18 verticle problem

[timmy]

Originally Posted by EdKozk2

Tim,
Since you don't have a scope you could try to isolate the trouble better. Disconnect/ unsolder C61 250mmf from pin 4 of V9. Leave C61 disconnected and then turn on the set. The picture should roll but, see if you can adjust the vertical size, if so set it. Next see if the vertical hold control has any effect on the vertical roll. If you can get the vertical roll to almost stop with the vertical hold in mid-position thats good. If the vertical hold has no effect or won't slow down enough then the trouble could well be a bad cap or resistor. The bad cap or resistor would determine the time constant the free running vertical oscillator frequency.
If the vertical roll can be slowed down and controlled, then I would next start checking the output of the sync separator. Try connecting a voltmeter set on AC volts, high range to start, to the end of the disconnected C61. You should be getting an AC voltage reading of some sort. You may have to adjust your voltmeters range downward to get a better reading. If there is no AC voltage present then the trouble is syn related. The integrated sync pulse voltage is what your trying to measure. Try these steps and let us know the results.

Ok I took the leg of c61 250mmf off and the size has very little affect and the vert hold also it's hard to see anything it's rolling so fast the hold I can see it slows Alittle from one end to the other on turning the pot the same for the size pot. I checked the cap pin for ac volts and I get .300 vac jumping around a bit. If there is a bad cap I may put in or a resistor I may have missed do you have an idea which one It might be. Maybe I put in a cap that is detective .

[kvflyer]

If you can't get the vertical to stop rolling with the hold control, (with the sync pulse disconnected) it seems as thought he vertical oscillator is off frequency. You should be able to get the picture to get close however, it needs sync to lock in.

You might check the capacitors in the oscillator circuit to be sure the correct value is there. Also, resistors for one that may have gone high in value or maybe one that was replaced with a value that is 10 off (Like 270KΩ instead of 27KΩ or .01 ᶙFD instead of .001 ᶙFd).

Just a thought. I realize how maddening it is!