R&S FSP-30 step attenuator repair

[Melvin G. (mgleep2)]

I purchased an R&S FSP-30 on Ebay which had a defective system disk. 
After replacing the disk and rebuilding the system firmware, I saw that 
the step attenuator is also defective. After determining that all 3 
attenuator pads were burned out (measuring ca.400k, 8.2M and 530k for 
the 10, 20 and 40 dB pads respectively) I decided to take the step 
attenuator apart and attempt repairing it. The pads are soldered into 
removable brass fixtures. I am trying to source the individual pads to 
be able to attempt replacing them.
The fixtures measure ca 10.7mm x 5.1mm x 4.9mm and the pads measure ca. 
5mm x  2.5mm.  Has anyone already attempted repair of this step 
attenuator and/or have any references for sourcing either the pads alone 
or fixtures with pre-mounted pads?

Thanks for any help.

[Gerhard P. (1123gp)]

Hallo, ich habe zwar keinen R&S FSP30, wohl aber den zugehörigen Step 
ATTENUATOR (Bild als ANLAGE); für ein vernüftiges Angebot bin ich bereit 
den abzugeben.  Gruß Gerd

[Mobile (mobileteser)]

If the attenuator is fully burned, mostly the first mixer is also dead. 
Before you change the attenuator, check the LO Level at 0 Hz. This will 
give you an indication if the first mixer is working. Maybe a internal 
test is partly working.
Here are some Basics in german: 
https://www.yumpu.com/de/document/view/22263368/grundlagen-der-spektrumanalysepdf-ing-h-heuermann