Quote:
Originally Posted by OldTechFan96
There is 100V across C350.
|
Ok, that's fine. So the zener is OK and the -1kv rail is just a little out. This is not unexpected. The adjustment would be a little coarse and it would be difficult to get it spot on. Its close enough.
Quote:
Originally Posted by OldTechFan96
I've subbed in a BC327 in place of the BF440 and the junction voltages remain -875V. Perhaps this is correct?
D351 had the same voltage on each side. It tested good out of circuit. There doesn't seem to be any voltage across it.
Would I be able to use my good scope to try and probe the blanking and unblanking pulses?
|
NO! Not unless you have a x100 high voltage probe. You do not want those kinds of voltages anywhere near the input of your good scope! The only signal you can probe safely is the 3.4v input signal I mentioned that is found at the bottom of the diagram.