Electronics > Repair
E4407B Tracking Generator Repair
smgvbest:
--- Quote from: smgvbest on September 26, 2020, 10:07:14 pm ---Tracing it so far. It does not go directly to the RF side of the A2A2 board
Goes thru a analog switch which switches between a fet op amp and J3 which is not connected, then to Q1 which I haven’t been able to find yet. It’s a 6 pin can. See Attached
--- End quote ---
Oye, I just did a SUT, I was not tracing TUNE on Pin5 I was tracing ALC_EXT on Pin10. I don't' know where I got Pin10 from but pretty much ignore my previous post. I'll go retrace Pin5 for Tune and see where it goes.
analogRF:
--- Quote from: smgvbest on September 27, 2020, 03:06:42 pm ---
--- Quote from: smgvbest on September 26, 2020, 10:07:14 pm ---Tracing it so far. It does not go directly to the RF side of the A2A2 board
Goes thru a analog switch which switches between a fet op amp and J3 which is not connected, then to Q1 which I haven’t been able to find yet. It’s a 6 pin can. See Attached
--- End quote ---
Oye, I just did a SUT, I was not tracing TUNE on Pin5 I was tracing ALC_EXT on Pin10. I don't' know where I got Pin10 from but pretty much ignore my previous post. I'll go retrace Pin5 for Tune and see where it goes.
--- End quote ---
I kinda knew because from the pictures I had already seen pin 5 (I had mentioned it is pin 5 it in my post) goes directly under that connector...
smgvbest:
So when you trace the correct PIN its pretty easy to find.
See attached
seronday:
Sandra,
I have just started reading this topic.
Correct me if I have misunderstood one of your earlier posts, but I understand that you have the schematic drawings for the 3Ghz A2A1 Driver board but not for the 3Ghz A2A2 RF board.
I have a printed copy of the drawings for the 1.5Ghz version of the tracking generator A2A2 RF board which I may be able to try to have scanned if this will be of any use to you. (There are 13, A3 size sheets).
Regards.
smgvbest:
@seronday
Thanks for the offer.
It definitely could help if your able to get those scanned
Sandra
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