Horizontal Sweep Adjustment?

[old_coot88]

If the h.freq. coil has a hollow slug requiring a hex alignment tool ('diddle stick'), be sure the correct tool is used. Otherwise you'll fracture or split the slug making it impossible to turn.

[Electronic M]

Originally Posted by old_coot88

If the h.freq. coil has a hollow slug requiring a hex alignment tool ('diddle stick'), be sure the correct tool is used. Otherwise you'll fracture or split the slug making it impossible to turn.

The correct tool is plastic. DON'T use a metal hex key on slugs EVER.

[old_coot88]

Right you are. I shoulda mentioned the tool is plastic (nylon?).

[DaveWM]

hmmm if the sams says to clip a wire across the coil as part of the setup process, then I can presume its not really a horz freq adj as implied on the schematic, That plus the fact that it suddenly stopped working points away from the coil as an issue). a stabilizer is not the same as a freq adjustment coil.

You can try it but if you dont get instant changes the don't go tweeking. I really doubt its going to fix it.

Next up, was there any thing else that may have happened before it stopped working correctly? did you try to clean anything or do ANY other work or did you just turn it on and it stopped working?

I am presuming you already tried cleaning the pins of the sockets. The most likely error would seem to be in the feed back RC network OR the pot opening up somewhere.

[old_coot88]

Yeah, definitely recheck the reference pulse feedback loop. It goes thru a whole string of components (R81, R82, C54, C62). A break anywhere in the path, like a broken foil trace, would kill the pulse.

[Magnavox300]

Thanks for all the good advise, as always!

Well, I did try to adjust both the horizontal drive, and frequency, neither made a difference.
There are not many resistors left to replace in the entire set, and I only have about 6 small ceramic caps I could replace in the Horizontal circuit, if by chance one of them may be bad...
I will also check the coil to make sure it's soldered well to the board, and no cracks anywhere... and check the hold pot with my meter...

I was also thinking, would the horizontal sweep typically have to be re adjusted after replacing caps and resistors and diodes?
If so, Sams gives me the procedure... Just not sure how to:
"clip a lead across the stabalizer coil"

[zeno]

I would do the procedure now. Cant find TP3, must
be at sync sep tube ? Probably the trimmer cap is
a coarse adjustment & the coil a fine adjustment.
L19 & C59 are a tank so they will oscillate when hit
with a pulse.

73 Zeno