Pioneer CDX-P1280 Owner's Manual page 15

Pressing the clear button/Touche d'initialisation
If the power does not switch on or if the compact disc player does
not operate when the button on the multi-CD controller is pressed,
or if the multi-CD controller display is incorrect, press this button on
the player with the tip of a pencil to restore normal operation. (This
button is located inside the dooL) Always press the clear button on
the multi-CD controller, too, after pressing this button.
• If the clear button is pressed when the player contains a magazine
or the ignition switch is set to the ON or ACC position, the CD title
display and ITS memory are cleared.
Clear b1l1ton
Touche d'initialisation