Because the SRU 4010 may use different signals for each brand and even for different models of the same brand, it is advisable to test whether your TV responds to the SRU 4010. The example below instructs you how to do this. 1 Turn your TV on manually or use the original remote control.Tune to channel 1. 2 Check whether all the keys are working. For an overview of the keys and their functions, see ‘3. Keys and functions’. - If the TV responds as it should to all of the key commands the SR