|
Do you have -90VDC (against chassis ground) at the far terminal of R109 (where you soldered the black wire for your terminal strip for the electrolytics)? All of the common negatives of your electrolytics should be there too, -90VDC. This is the -90VDC that feeds pin 3 of your HO tube (dropped to -65VDC thru the R98/R99 pair). If you can see -90VDC at the R109 tap-off, and at the terminals of your strip, then you ought to see it at one side of the R98/R99 pair. The other side of the R98/R99 pair connects to pin 3, where you see 0V. If you have 0V at pin 3 due to a short to ground, then (as WA2ISE says) you'd expect the resistor pair to smoke. If you have 0V there because you've got no -90VDC coming in, then it should be easy to track down from what I just said.
You should verify -90VDC at the R109 lug, as stated above, and also verify -43VDC at the center lug, and make sure the left lug is grounded. Verify the +3.8VDC, +115VDC, +205VDC, and +220VDC points as well, as shown in the sams schematic at R105, 106, 107, 108, and 109.
|