Electronics > Repair
CMU200 Rohde & Schwarz hangs during BaseDiscoverOptionsBegin
Bicurico:
I answer myself: without the digital board, booting is normal, but WDCMA options is missing and RF spectrum/generator will crash the machine. :(
Bicurico:
1) Opened one of my CRTU and removed the two DSP modules from the DIGI board (CRTU has two)
2) Put each in my new two CMU200 (both had broken DSP module inside DIGI board)
3) Both CMU200 now start correctly, showing the serial number and spectrum works
But:
1) CRTU does not power up anymore, no matter if:
- remove DIGI board
- remove 2x broken DSP modules but insert DIGI board
- insert 2x broken DSP modules and insert DIGI board
It seems that the DIGI board is doing the power up and decides if the PC module starts or not.
2) Both CMU200 lost WDCMA capabilities. I think this is integrated in the DSP module.
So I traded one working CRTU to get two CMU200 running.
Anyone knows why the DSP modules break?
Regards,
Vitor
Velund:
--- Quote from: Bicurico on January 29, 2019, 01:06:18 am ---2) Both CMU200 lost WDCMA capabilities. I think this is integrated in the DSP module.
--- End quote ---
Did you run "hardware change" procedure? Maybe DSP firmware should be updated to match main SW?
Bicurico:
I did.
Also installed latest FW and put in some keys...
No WDCMA options anymore.
I think that the DSP modules are all different with different options inside, though they are interchangeable.
Ice-Tea:
I'm going to put the following remark not as a statement of fact but rather to provide additional data for possible future analyses. I may be 100% off base or this may just be a coincidence.
I recently got a CMU200 back to work (display issue). Tested it when half-assembled and it worked fine. Put it back together and it didn't anymore. It orginally threw an error "unable to load FPGA from file" but after some tinkereing it now gives me the "stuc.cpp" error.
Taking it apart again, I noticed I swapped two of the Compact Flash flat cables. May have caused the issue or not. Restoring the correct order or just taking out the CF didn't help anymore so the damage appears permanent.
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