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20Y1 Admiral horizontal frequency problem
I continue my efforts on a 20Y1 chassis where the freq of the horizontal osc is way off. So far off there is little HV. At this point ALL osc compoments have been replaced and double checked and tested. the tubes subd out even the HV rect, the yoke subed out, the flyback rung out with a scope and a square wave generator (rings well). The wiring and components have been triple checked against the physical reality.
http://i375.photobucket.com/albums/o...s/DSCF0196.jpg The scope shows the present condition (top) of the osc as compared to the sync/ video signal (bottom-good). I need fresh perspective. Is the feedback signal from the HOT xfmr via the 5pf cap that important to the freq of is it just for locking. Is this still possibly an output section problem. Is there a good writup on the SyncroGuide osc, this looks like the RCA type. Has someone run into this before. I'm out of rabbits to pull out of a hat on this one. At one time the set was running and just quit. The reason for checking wiring was to make sure I didn't create a new situation as I rechecked components and such. Last edited by 6GH8cowboy; 01-06-2012 at 01:24 PM. Reason: photo |
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