Hello Alberto,
DSA means Digital Signature Analysis. A signature analyzer (like the 5004 or 5005 series) is incredible helpful if there is a problem with the logic...
Repaired two of these recently, these are beasts and very difficult to repair. I recommend to try to perform a full calibration. The troubleshooting trees are very helpful for individual problems,? but as soon as an instrument has multiple problems, they sometimes might be misleading.
Chris
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On Sun, May 30, 2021 at 01:26 PM, Alberto, IZ2EWV wrote:
Hello friends,
I'm repairing a 3585A spectrum analyzer that has problems with its local oscillator ("LOCAL OSC. UNLOCKED" on the screen).
First, I found a bad 2N3055 in the A34 LO control board, which didn't give +5V to its own circuits and to the A33 N-fractional divider.
But, even if, after this repair, something more begun to become alive in that area, I'm still going on with the LO Control (A34) Troubleshooting Tree (page 11-212 of the service manual) and I'm asking the meaning of this checkpoint: "Is the problem related to a DSA failure on another board?".
Thanks in advance to every guy who can give me the explanation of DSA, which allows me to take the appropriate answer and take the right branch of the tree!
Alberto
?Hello
