26Selection “EXR 552”Transmission channelUse the buttons to select a free available transmission channel. A maximum of two transmissionchannels are available (1400 and 1516 MHz).Test connectionWhen you have set a free transmission channel, press the buttons to switch to the “Test Connection”selection field and press the button. The receiver now tests whether a connection to the single-cablesystem can be established or not. As soon as the receiver has established a connection to the single-cablesystem, you will see the following display:FIRST INSTALLATION: Single-cable system (Manual)If no connection to the single-cable system could be established, you will receive the message:Check your settings and if necessary call for expert help.When the “EXR 552” single-cableswitching matrix is being used, itis essential that the LNB is set to“Universal”!Press the button to acknowledge this display.Then press the button. You will be asked whetheryou wish to save the changes. Use the buttonsto select “Yes, save changes” and confirm by pressingthe button. Now press the ! (green) button.The receiver will automatically display the selection menu for the channel search. Continue by selectingthe item (Execute Channel search).