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#16
07-01-2022, 10:19 PM
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Pin 5, V3 again. Yeah, that's why I posted it. It looked a little odd.
I've checked all the resistors in that section and all are decently within acceptable range. All the caps in the H area are all ceramics, except for one C124, which is an Elmenco wax/ceramic. Although cosmetically it looks fine, it's in the crosshairs next time I crack this set open. This one is easy to access. The other White ceramic in the boost, a .1 1KV is only accessible by pulling the chassis, which I'm understandably not enthused about. I have checked out DRH's post. I referenced it before, for VDR issue in an older metal cab Zenith. The part numbers in this unit, unfortunately were not covered by his cross reference. Although I did try swapping with what I had on hand, it only made things worse. I have no specs for the ones in this set, other than black and orange bands. Quote:
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#17
07-03-2022, 11:53 AM
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So I looked at this page on a different computer, and it got pictures. I can see the
snippets of Schematics, & the Oscilloscope trace pic. The Scope trace looks very good. The 190V on pin 11 is high, and at this point I would be wondering about the 1W & 7W resistors attached to it, and what goes on down stream of that point. The difference between -78 & -48 on pin 5 is also quite high. I Also think it's worth taking a current reading off pin 11 as they give a 20ma. number there..... You know if they print that, it's for a reason, and I would want to know what it is given the set looks pretty good. With 30V lower G1 & what looks like a perfect waveform, I think the picture should be pretty narrow & Boost much lower (more than 100V lower)..... With a good G1 Drive Waveform, I think I would take a walk on over to pin 11 and poke around a bit..... .
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Yes you can call me "Squirrel boy" Last edited by Username1; 07-03-2022 at 12:03 PM.
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