I have the HCP2550T channel processor, which was working fine until I switched to a T-channel. I have checked all switch settings, I have the composite loop in place and nothing works.

When using the HCP2550T or the HCP1550T unit on a T-channel, the signal must be fed into the “T-channel input” and a jumper must be added between the “Up-converter output” and the “RF input”.