Zenith console

[DaveWM]

yep thats it. I will do as you say.

[DaveWM]

while futzing with the set I noticed a pretty extreme reverse pin cushion (guess that it the way to describe it, the horz bends up on top and down on the bottom). 1st I checked the tube, checked ok on tube tester, and its new. Next I check the tube pin resistance mearurements to the sams, ok. I tried the pin cushion adj slug and was able to get some of it out but still there.

Its like it just runs out of adjustment ranges. The circuit controlling this has a pretty low parts count. I was next going to try checking to see if it has any plastic/paper caps still in it (the pin cushion circuit). Should prob try a tube substiution just to be sure about that as well.

[DaveWM]

while fussing endlessly with the convergencem, I decided that something must be wrong. I makes almost no difference when plugged and unplugged (dynamic convergence).

So I decided to check the diode pack, hmm a long crack runs the length of it.

Tested 2 of the diodes, so far both are open. Squeezing the pack makes for momentary resistance readings. I checked the voltages on the conv board before pulling it, no DC reading where there should have been but AC reading instead (which is why I suspected the diode pack).

Anyhoo I have some 1n4005 diodes that I will use (the orig are 1n536).

I hope this does the trick...

[DaveWM]

That was painless, just snipped out the old diode pack (all were open) left the little bits in but for the ground which i heated up the little solder pot, and pulled out the remnants as I would be having 4 diode ends going in that common ground. I put spagatti on the diodes (color coded) and installed.

Whats nice is now that I have a good diode pack (well after I test it anyway) is I have a set of reading that I can use in circuit to compare other convergence boards with. It will not be fool proof, but hope it finds open or shorted diodes in circuit.

I am getting tired and its dark in the shop as my lighting is not the best so I think I will just bag it for now and reinstall tomorrow. I hope my convergence woes are over.

With out having a lot of experience the problem is knowing when a convergence board is working right, marginal, very weakly.