As of June 12, 2009, all television broadcasts in the United States have switched from analog to digital. The digital transport adapter from Comcast allows you to continue to receive cable and over-the-air broadcasts through an analog television set. After installing the adapter, several problems may arise that you may have to troubleshoot in order for it to work properly.
Check that the power cord is securely inserted into the back of the DTA and plugged into a functional wall outlet if you are not getting any power to the device.
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Activate your DTA by visiting comcast.com/digitalnow or by calling 1 (888) 634-4434. You must connect all your DTA devices and activate them before you can use them.
Set the DTA and your television to the same channel, which will be either channel 3 or channel 4. If they are both set to channel 3 and you don't see a picture, try setting them both to channel 4.
Make sure the VCR is turned on if you have the DTA connected to a VCR as well as your TV.
Remote Does Not Work
Check that the batteries in the remote are operational and correctly inserted into the remote. You have to line up the "+" on the battery with the "+" inside the battery bay.
Ensure you have a clear line of sight from the remote to the DTA. Because the remote operates through infrared, it cannot be obstructed by a cabinet door, wall or other object.
Make sure the remote control signal receiver is properly connected to the DTA if you are using that.