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Re: HP853A+8559A spectrum analyzer.


 

It's getting harder for me to understand. It's also getting late. Also maybe the pass transistor is dead.

First, F3 fuse was blown. I did not pick this up immediately, I should have. Shorting the fuse with the multimeter i'm seeing a 6mA draw and still no 100V output.
I'm kinda bad on transistor theory. I'm seeing the 200V on the collector of Q4, something like 13V on the base and 12V on the emitter. To me it sounds like Q4 is bad.?
What do you guys think?

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