Fred, one does not have to disconnect the TIU. Turn off all power to all 4 inputs and power the TIU through the AUX port. One does have to access the TIU to plug in the jumper jack, the computer cable, and the phone cord. Given that your new remote most probably does not have the same version as your old, you're stuck with having to do the job, which is easy using the latest loader program which gives step-by-step instructions on the screen.
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