If C connected to LNB 1 on switch and Ku connected to LNB 2 on switch...
The setting for a C satellite in Antenna Setup should be...
diseqc 1.0
LNB 1
The setting for a Ku satellite in Antenna Setup should be...
diseqc 1.0
LNB 2
Note that if you are using a
BSC621-2 C/Ku LNBF, it has a built in
diseqc switch on the C LNB. C wants to be LNB 1 and Ku wants to be LNB 2. I don't use this switch and instead have two wires run from the LNBF to another diseqc switch. But I am consistent with the wiring to avoid trouble. C is LNB 1 and Ku is LNB 2 on the seperate diseqc switch.
Also I noticed a software bug with
Mercury software version V0151 where it was not switching the diseqc switch. I went back to version V0145 and it worked fine again. So if using V0151, might want to try V0145 and see if this solves the problem.
Also check wiring. Are you using different wires with the direct to receiver connection than when uisng the diseqc switch? Might want to swap the C wire with with the Ku wire and see what happens.
Also try moving the C connection to LNB 2, then LNB 3, then LNB 4 (and change settings in the receiver) and be sure that works.