Electronics > Repair
Rohde Schwarz FSP IF Board Failure
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Testtech:
I am working on a new-to-me Rohde Schwarz FSP spectrum analyzer that has a failure on the IF board.

The self test display is below.

Anyone have experience with this model? I have the service manual, but no schematics, and the block diagram is of little help.

It appears that the measurement circuitry on the IF board isn't working, or perhaps a logic problem.
The main PSU is fine.
Harry_22:
Hi!

I found FSP in a good condition:)
I'll have a look.
DaJMasta:
Don't have experience with this unit, but it sure looks like the ADC, its reference, or its Mux is dead.  You should probably run a test to see if the board itself is operational, and if it's capable of running at least some of its functions, it is probably a self check measurement failure.
Harry_22:
Hi!

I put 2.2k resistor between REFADJ (Pin12) and Gnd.
Self-test results are now similar.
Check the capacitor on pin12 first.
As far as I remember, there are several MEGs between pin12 and Gnd.
Harry_22:
Hi, Testtech!
Do you have any further info?
Please don't hesitate to contact me.
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