Electronics > Repair

E4407B Tracking Generator Repair

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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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