Onkyo is a Japanese-based electronics company whose history dates back to 1946. They currently manufacture a wide variety of products for the home audio and video markets. Among those products is a line of remote controls to replace a lost or broken remote or to simply combine the functions of different devices' remotes into one. Programming an Onkyo remote is a simple process, with the necessary device codes.
Locate the number code for the device (TV, DVD player, etc.) that you wish to program the remote to. A list of codes for all the major makes and models of components should be provided with the Onkyo remote; check Onkyo's online support page to find the list that accompanies your particular remote if you do not have one.
Hold down the remote mode button for the intended device (DVD, VCR, TV, etc.) and press the "Display" button (or "Standby," on some models) for three seconds.
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Use the number keys to enter the four- or five-digit (depending on the model) code for that device within thirty seconds. Some makes and models of components have more than one option on the list; try another if the first one does not work. The remote indicator will flash twice if the code has been accepted.