Mitsubishi CS-40503 Owner's Manual page 55

<using your remote control to operate your cable box>
After you have set up your remote control for your particular brand
of cable box, you can use the remote to operate your cable box.
O Choose the layer using the select button on the remot_ control:
VCR-A, VCR-B or CABLE,
O Point the remote control at the cable box and press the desired
buttons.
Only the POWER and CHANNEL buttons can be used when oper-
ating your cable box.
Getting Started 51