Hitachi 31KX39K, 31GX31B, 31DX21B, 31DX11B Operating Manual page 42

USING THE GENIUS REMOTE TO LEARN ADDITIONAL
FUNCTIONS (31GX31B ONLY)
EXCLUSIVE BUTTONS
These buttons are for operating the TV.
Storing Operation
Set the remote transmitter as shown below.
Put the remote transmitter which contains the codes to be stored and the GENIUS
REMOTE transmitter to face each other. (Distance should be 2 - 4 inches.)
Set the LEARN/USE mode select switch located on the back of the Genius Remote to
the LEARN position.
Set the MULTI-PAGE select switch to "USER" position.
4. Press one of the learnable buttons on the Genius Remote, ("7" in this example).
This button will be used to store the new code. The READY indicator will light at this
time. (The light will remain lit for approximately 15 seconds. If no other function is
performed at this time, the operation is canceled.)
The Genius Remote is ready to receive an infrared code from another remote.
5. Press and hold the button down on the other transmitter which contains the code to
be stored, while the READY light is lit.
Release the button after both the READY indicator goes out and the LEARN indicator
lights.
When storing has been performed correctly, the LEARN indicator lights for about 2
seconds.