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Rohde & Schwarz CMU200

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Bicurico:
I might be wrong (long time since I looked at this), but there should be 4 such C4 components, one for each input. Two on each side of the PCB, which is why you need to dessolder the component I mentioned before.

switchabl:
IIRC there are only two. The one for RF3 is on the top side. The one on the bottom is for RF4 and you need to desolder the attenuator and the connectors to get to that one. RF1 and RF2 don't have dedicated amplifiers.

F4IUJ:
OK, it makes sense now...

luc-on7kz:
Hello,
at the hamradio event I have buy a CM300, I'm not the specialist from these equipment's and has not tested completely before I buy  :palm:
ant there are issues  >:(
first is the generator has a 3dB to low output on all the outputs and frequenties will these be a hard or software problem?? who can help me with these ??
A other fault is the message LO0Tunediag must be giving a value from 26.5v but must be between 0 and 20v I suppose these is someware a local oscillator
but don't find it direct into the (poo) service manual.
The generator and spectrum analyzer is only functioned to 2.2Ghz, readed spectrum levels are correct but not higher than 2.2Ghz
So who can help with tips/trick enz...
Greetings Luc ON7KZ

RBBVNL9:
Luc,

Your observations suggest some problems indeed. But I'd suggest you first carry out all the self-tests (including loop 1/4 and 2/3) and relevant calibration procedures. This video may help you with some of this.

Then there is the service manual.

. rudi

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