Electronics > Repair
E4407B Tracking Generator Repair
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smgvbest:
Just an update,   have had some things come up in personal life so had to step away from this for a bit.   will be back with soon I hope
smgvbest:
Looking for help in identifying some components
in PICT0007.jpg   looking to identify all marked ones.  the one I put a D on,  the D is the only marking on the component.   I think this is a dual diode package for the peak detector.

I loose allot of power at the point of this component.   like -25dB.   this is suppling the 786.5hz RF to the Mixer (5x that but I can't measure on my 1.5Ghz SA)
in  IMG_2867-1.jpg
smgvbest:
these 2 Sot-23's marked 8F I think are 5.1v zeners but 8F can be a NPN transistor as well
both read strange but reading is in-circuit.  one reads 24.7K forward and reverse and other is like 30meg forward and reverse.   I'll get them out of circuit to test but they are connected to V1/V2

smgvbest:
Here's another area.   all but the one with a ? is identified but  I marked one component that looks damaged?   any thoughts on that?
analogRF:

--- Quote from: smgvbest on October 16, 2020, 11:29:44 pm ---Looking for help in identifying some components
in PICT0007.jpg   looking to identify all marked ones.  the one I put a D on,  the D is the only marking on the component.   I think this is a dual diode package for the peak detector.

I loose allot of power at the point of this component.   like -25dB.   this is suppling the 786.5hz RF to the Mixer (5x that but I can't measure on my 1.5Ghz SA)
in  IMG_2867-1.jpg

--- End quote ---

the white elements are most likely resistors. you can check with multimeter
the "D" element is most likely HMPP-3890 single schottky diode by Agilent/Avago but are you 100% sure about the marking? sometimes it is tricky to read the labels
seems that all 4 pins of it have been used  ??? also for a good temperature compensated peak detector it makes sense to have two diodes in one package but if the marking is only a "D" then I couldn't find anything other than HMPP-3890 which is still applicable...

the element with red dot is what is used to generate 5th harmonic if i remember correctly from previous discussions, so it is probably a diode of some kind.
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