I installed one of these on my big 12 ft. dish and it is working fine (both C and Ku). It is now 15 ft. up in the air, so I can't look and see what is inside.
I should think something should work.
When I first installed mine, I took my small TV and receiver outside, then connected a cable to just the C LNB and tested that. Then moved the cable to the Ku LNB and tested that.
Be sure your
C-band L.O. is set to 5150
and your Ku is set to Universal or L.O. 10.6 and low L.O 9.75
Be sure you are in fact connected to the C-band LNB when testing C-band and in fact connected to the Ku LNB when testing Ku. Here are the instructions and a diagram of which is which...
Click on pictures and pdf...
BSC621-2
Then once you get both working and install the jumper wire, set your receiver to diseqc 1.0 and LNB 1 for C and diseqc 1.0 and LNB 2 for Ku.
Also watch it when screwing in and unscrewing coax cable to the LNB's. The connectors on the LNB's will turn if the nuts holding them are not tight. Then if these kept spinning, I suppose the wires inside the LNB would break.
Here is the contact info for the manufacturer...
DMS International Contact Center