Electronics > Repair

Agilent E4421B RF generator restoration project

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imaurente:
Hey guys!
I'm having problems with my 4421B, it simply doesn't activate the modulation, I hear the sound from the relay, but it doesn't work. It's like trying to activate modulation, but it doesn't, I've already done some tests:
1) I used the external modulation input and it worked well;
2) The OCXO is in order, 10mhz perfect and signal without imperfections.
One detail, about a year ago, my time base stopped working and I replaced it with the same one (ebay) and everything went back to normal, I don't have the service manual, if someone could make it available it would be of great help.
Note: The signal in blue and the attempt to modulate in FM (dev=100khz)

Hug!

e120guru:
@nctnico, do you by any chance still have your design laying around for the display interface? Or any details on the pinout of the original display cable? I need to perform a similar operation, and managed to come accross the same display you used.

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