Motorola 17T21 Flyback & Schematic

[Electronic M]

What I would do is put back the good tube, get the hold as close to center as you can then adjust the H osc transformer/coil to re-sync...If you can't get the front control to center you may have to alternately walk the pair. There is often two adjustments on the osc. can one is for stability. If the service lit lacks a non-scope method of adjusting the osc. then it may be a good idea to get a scope on it.

[Mre12ax7]

Originally Posted by Electronic M

What I would do is put back the good tube, get the hold as close to center as you can then adjust the H osc transformer/coil to re-sync...If you can't get the front control to center you may have to alternately walk the pair. There is often two adjustments on the osc. can one is for stability. If the service lit lacks a non-scope method of adjusting the osc. then it may be a good idea to get a scope on it.

I tried what you suggested. I think that made it worse, there is now no point where it will lock the picture.

[dieseljeep]

Originally Posted by Mre12ax7

I tried what you suggested. I think that made it worse, there is now no point where it will lock the picture.

You have to follow the horizontal osc coil proceedure, per the schematic. The set also uses the horiz phase detector circuit, another 6SN7 next to the 25L6. Check around that area.

[Mre12ax7]

I feel really mad.
I managed to break the fine tuning shaft.
The shaft is broken where it connects to the little plate in the back.
Does anyone have a spare tuner or a way to fix it?