Mitsubishi CS-35707 Owner's g Manual page 76

Changing channels while using the PIP modes
You can use the buttons on the remote control to change the
channels of both the main image and the small PIP image.
To do this:
O Press the PIP channel button
(PIP CH) on the remote control
to chan_e ':he channel _fthe
PIP image.
O Press the CHANNEL batton on
the remote control to change
the channel of the mair_ image.
Using the Picture-in-Picture (PIP) Modes 79