Electronics > Repair
CMU200 Rohde & Schwarz hangs during BaseDiscoverOptionsBegin
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Bicurico:
Hi,

I don't think that swapping the CF cables would cause any harm - you would just map slot 1 to CF2 and vice-versa.

Unless, of course, you put the flat cable the wron side around, which again I don't think is an easy thing to do...

You might have:

- broken HDD
- corrupted file system
- broken module

Or, and this is a long shot: because you connected the CF slots in the wrong order, the C, D, E, ..., letters are now messed up and the BIOS/filesystem tries to load files from the wrong unit?

Good luck!

Regards,
Vitor
Ice-Tea:
Well, figured it out in the end. There was another small flatcable not fully inserted somewhere in the chasis.Hadn't touched it but must have gotten a bit loose during assembly ;)

For my understanding; there's 3 flatcables for the CF card. How do you come to the conclusion swapping them could not cause physical harm?
Bicurico:
Great news! I am glad it was a simple thing.

Please allow me to apologize - I forgot that the card-reader does feature three flat cables and they indeed all have the same connectors. Plus the length of the cables is ALMOST identical - W216 is shorter. I went to my spare parts box and looked at it.

I would say you could manage to swap W217 and W222.

Anyway, I stand by it that you probably would not break anything if you swapped the cables, as I think that there is no dangerous voltage in any of those pins and ground is the same. Some pins are not even connected, as the resistors are missing.

I suspect the third cable is not even used? The PCB is missing an IC that connects to W216.

Regards,
Vitor

Ice-Tea:
I'd give it a try but I don't want to jinx it ;D

Anyways, using the same cables 3x on the same location is just asking for trouble IMOH.

For those stumbling upon this thread somewhere down the line: atached is a picture of the offending flatcable.
Bicurico:
If I am not mistaken, that is the flatcable that connects the RF-Frontend module to the main board.

It is best accessed from the other side, when you remove the RF-Frontend module (I think).

I can imagine all sorts of errors if this cable is not propperly fitted and yes, it could get loose while messing around with RXTX-modules... (they need a lot of unscrewing of the waveguide connectors).

I wonder how long it took to develop the CMU200, considering its complexity and engineering...

Regards,
Vitor
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