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Video Teardown and Repair of an Agilent E4433B ESG-D Signal Generator

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syau:

--- Quote from: syau on July 16, 2020, 03:07:43 am ---Sorry for digging out this old thread, my unit has the same issue and I am finding a way to fix it (besides soldered 2 wire)
(Attachment Link)

--- End quote ---

Fixed by replacing the Q772 with MMBT3906LT1G and CR771 with MMBD1201.

TK:

--- Quote from: syau on July 16, 2020, 10:02:56 am ---
--- Quote from: syau on July 16, 2020, 03:07:43 am ---Sorry for digging out this old thread, my unit has the same issue and I am finding a way to fix it (besides soldered 2 wire)
(Attachment Link)

--- End quote ---

Fixed by replacing the Q772 with MMBT3906LT1G and CR771 with MMBD1201.

--- End quote ---
It worked for me as well, no more UNLEVELED error!

syau:
Anyone managed to “adjust” this unit without using the Agilent software ? The reason for asking is my unit have 4dbm lost on 4GHz.

syau:

--- Quote from: syau on November 08, 2020, 11:14:44 am ---Anyone managed to “adjust” this unit without using the Agilent software ? The reason for asking is my unit have 4dbm lost on 4GHz.

--- End quote ---

Replacing the RPP didn’t help but bypassing it with semi rigid did :-//

Miek:
Just to chime in with another data point, I recently repaired an E4433B that was showing "unlevel" and no output. After probing along the RF path on the output board I found a lot of loss along the burst mod diodes and only around 4.2V bias across them. Replacing Q772 fixed it for me too!

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