Products > Test Equipment
Rohde & Schwarz CMU200
Kribok:
Hello to everyone and sorry for poor English.
Encouraged by the possibilities and low price of the CMU 200, I bought it for around 900 $ with a view to using it in radioamateur measurements (spectrum analyzer + RF generator). After one week of use, the RF generator stopped working. I was looking for information about the fault, but I found nothing interesting. At the time when I want to turn on the FR generator, the device hangs and the buttons do not work, I need to turn off the CMU 200 to work again. If anyone has any interesting proposals for repair then I will be grateful. I will take photos and a more detailed description of this fault soon.
I greet everyone
ZL1CVD:
Check the two 50 way cables W223 & W224 are firmly in place - these connect motherboard A200 to motherboard 2 A201. Quite common for W224 to come loose. Also check 34 way cable from front end module A20 to motherboard A200. Also look at the software version number when it starts up. If it says 5.21! and not 5.21, then there was a problem with the DOS software installation and you should reinstall. Choosing "firmware update after board change" in VERM can sometimes also clear the problem. Finally, a faulty digital unit A7 has been known to cause this issue. Re-seating the board may work also pulling it apart, removing the sub modules and giving it a good clean also works. 73s om de chris zl1cvd.
Kribok:
Thank you very much for the hints and interest in my problem.
I unscrewed the CMU 200 to check the connections and took out the RX / TX module, just like my colleague had previously said about cleaning, the whole module was heavily soiled, I took out all the modules in turn and cleaned, including the control module and the fan duct.
I took pictures, and I'm working on putting them in this forum - I'm sorry I'm a novice.
TheDefpom:
I thought I might was well post these here for reference, it might be helpful to someone.
Kribok:
If someone buys such a device second-hand, it is worth to unscrew and clean them, just like your friends suggest.
I attach a few photos of the condition of the device.
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