Av source pc source, Note, Selecting a screen size automatically – Pioneer PDP-LX5090 User Manual

Page 54: 1 press home menu, 2 select “option“ (i/j then enter), 3 select “auto size“ (i/j then enter), 4 select “natural” or “wide-zoom” (i/j then enter), 5 press home menu to exit the menu, Detecting side masks, 3 select “side mask“ (i/j then enter)