Planar PDP42HD - Manual (Page 21)

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Number Buttons: Use Number buttons to choose specific channel. For example,
to select channel 27, first press 2 and then press 7. For channel 101, first press
+100 and then press 1.
Sleep Button: Press the sleep button repeatedly to set the sleep timer to 30, 60,
90, and 120 minutes.
TV Button: Press to switch directly to the TV mode.
YCbCr Button: Press to switch directly to Component YCbCr mode.
AV Button: Press to switch directly to Composite mode.
PC Button: Press to switch directly to PC mode. Press again to change between
D-Sub 15 and DVI mode.
YPbPr Button: Press to switch directly to Component YPbPr mode.
S-Video Button: Press to switch directly to S-Video mode.