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

[syau]

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)

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

[TK]

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)

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

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]

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

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!