Products > Test Equipment
HP 8566B - What to look for?
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KE5FX:
I'm not sure where my copies came from, I think they were originally from Agilent's own site.  At least some of the files, including the copy of 85662-90085 I clipboarded the above from, are available on the Internet Archive. 

The problem is, whoever OCR'ed them didn't GAF what they were doing, and used some seriously-inappropriate compression settings  As a result various bits and pieces of text including many numeric values were replaced with the OCR'ed text, rendered in the OCR app's best guess as to the correct font. 

This actually changes the information in some cases:



So you don't want any part of these files, believe me.  That's one of the reasons I keep paper copies on hand.  It's unfortunate if Artek's files weren't captured from a later edition, but at least they don't screw up stuff like this. :(
W4PJB:
I had never even considered OCR, as I never use it when scanning PDF's. But that's an EXCELLENT point!

Thanks again!
W4PJB:
It's always the last place you look, right?   :D In this case, it was literally the last board in the unit there was to check.

I found capacitor C22 was missing its magic smoke. This coincides with the approximate location of the volcanic eruption I saw from the right side of the display unit when it failed.

An equivalent seems to be available from Vishay (DigiKey 150D225X9020A2BE3) and I will probably go ahead and just replace all 3. C21 measures OK at 2.19uf but it's seen some heat damage from C22, and C20 measures around 2.8uf and has about 20% less phase rotation according to my LCR meter, so I'll guess that one on its way out next.

Once I get the display up and running then on to the 2-22 GHz problem. Thanks for everyone's help!
KE5FX:
Yep, the neighboring tantalum caps are a good exception to the "Don't replace unless defective" advice. 
W4PJB:
Well I got the new caps in today and viola! We have a screen!

Now onto the real work; figuring out why I have no signal on the 2-22Ghz band. Thanks for everyone's help!

I'll start with checking all of the voltages very closely, I understand the YIG can be very sensitive to even small errors here.
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