Akai PDP4290 Owner's Instructions Manual page 31

Selecting anExternal Signal
You (;an use PIP to view a signal from an external source, such as a VCR.
Press the Menu button. Move the joystick up or
down to select "PIP", then press the joystick to
enter.
Move the joystick up or down to select "Source",
then move the joystick left or right to enter.
Move the joystick up or down to select an external
signal, then move the joystick left or right.
Press the Menu button to exit.
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