I just got a new DVR/HD box from Comcast. It's the DCX 3400.
I also have a Harmony 890. I plugged a 3.5mm cable into the IR Input on the back but the box won't receive the signal from the wireless extender.
I went into the "Configuration" menu on the DVR and I see that it says "IR Blast: No"
I'm not sure if that indicates the IR Input is diabled so I called Comcast and asked how to enable the IR Input. The lady said that the feature is disabled. I asked her why they are crippling a great feature on the box and she said " I don't know what to tell you "
I plugged in the IR plug that is included with the wireless extender and taped it over the IR Input on the front of the cable box and it's working fine, but I'd really rather plug it in directly to the back.
They're obviously no help. Does anyone know any tricks to get this thing enabled?