Electronics > Repair

E4407B Tracking Generator Repair

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smgvbest:

--- Quote from: analogRF on October 18, 2020, 01:58:19 pm ---I dont think the marking on the dual diode package is "D". It must be 2 letters and "D" seems to be the second letter which is a date code
there is a very faint letter before "D" it's either "B" or "C" i think
you need to look carefully at proper angle

--- End quote ---

I have twisted and contorted in every possible way so see and what I posted is the best I can get


--- Quote from: analogRF on October 18, 2020, 01:58:19 pm ---why do you need to do this? I think we concluded long ago that LO was present and working
in fact your TG is working normally most of the time except some short dips in amplitude
which you must find out their correlation with other signals to see what is causing them
other than that between those blips, the TG is working normally. Obviously if you didnt have LO coming in
this would not have worked at all
So i dont see the point of this test. Besides, if anything, you would need to know the precise amplitude of coming LO
which this test will not tell you but you measured that with power meter and it was alright.

--- End quote ---

This was to look at the 768.5Mhz getting multiplied by 5x and where it happened is all.

If I didn't already say so I'm also documenting as much as possible about the BITG for others in the future. (you can still get the BITG from Keysight for a mere $4500 
This is why the boat load of pics and sometimes extraneous information


--- Quote from: analogRF on October 18, 2020, 01:58:19 pm ---B1 and B2 are power supplies for the RF ampliiers.

C8 is the output of peak detector and must eventually become ALC_MON after further processing on the other board

you need to find out the relationship between V1/V2 and PWR_LVL signal coming from A2A1

is there any jump/dip in OSC_PWR consistent with the dips in the TG output power?

--- End quote ---

working on the other board to trace the signals around
i did not note any DIPs in OSC_PWR.  it is very stable.

unrelated,   now is the only time I regret having done lasic eye surgery.   my near vision it shot and everything I do is under a microscope.
wouldn't change having done it but this does get frustrating at times

smgvbest:
Here's another part I'm having trouble finding
Marking is a Linear Technologies 531 (LT531) but I can find no such beast.

Anyone recognize this 8 pin guy?


analogRF:

--- Quote from: smgvbest on October 20, 2020, 12:27:37 pm ---Here's another part I'm having trouble finding
Marking is a Linear Technologies 531 (LT531) but I can find no such beast.

Anyone recognize this 8 pin guy?

--- End quote ---

531 is the date code (2005/ week 31)
This is LT1021 precision reference 10.000V

smgvbest:

--- Quote from: analogRF on October 20, 2020, 12:30:15 pm ---
--- Quote from: smgvbest on October 20, 2020, 12:27:37 pm ---Here's another part I'm having trouble finding
Marking is a Linear Technologies 531 (LT531) but I can find no such beast.

Anyone recognize this 8 pin guy?

--- End quote ---

531 is the date code (2005/ week 31)
This is LT1021 precision reference 10.000V

--- End quote ---

Thank you very much.
That would make sense where it is in the circuit.
i don't see how how to get from the marking 2110 i guess to a LT1021,  is this some vodoo magic or am I (very likely) missing something simple)?

analogRF:

--- Quote from: smgvbest on October 20, 2020, 01:25:49 pm ---
--- Quote from: analogRF on October 20, 2020, 12:30:15 pm ---
--- Quote from: smgvbest on October 20, 2020, 12:27:37 pm ---Here's another part I'm having trouble finding
Marking is a Linear Technologies 531 (LT531) but I can find no such beast.

Anyone recognize this 8 pin guy?

--- End quote ---

531 is the date code (2005/ week 31)
This is LT1021 precision reference 10.000V

--- End quote ---

Thank you very much.
That would make sense where it is in the circuit.
i don't see how how to get from the marking 2110 i guess to a LT1021,  is this some vodoo magic or am I (very likely) missing something simple)?

--- End quote ---

I already knew that part because I had seen and used it before myself but if you search for Linear Technology 2110 SOIC
you'll find it after a little while  ;)

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