US Patent 7397999 Signal receiver

A signal receiver for displaying received broadcast electric waves including: a first memory for storing as a past record information representing whether the signal receiver was previously subjected to initial setup, an alarm device for alarming the necessity of initial setup of the signal receiver when the connection of a power source plug to an external power source is detected and no past record exists in the first memory, whereby a user can surely perform the initial setup, a second memory for holding the initial setup frame displayed on the display device after a response to the alarm of said alarm device is received or at the same time when the alarm is made, a third memory for storing district codes and reception channel groups corresponding to the respective district codes as a district code comparative chart district, and a tuner with which when a district code is input on the initial setup frame, the reception channel group corresponding to the district code thus input is read out and a channel contained in the reception channel group thus read out is selected.