From the manual... Resetting the main unit Use this procedure to reset all the receiver's settings to the factory default. Use the front panel controls to do this. VSX-515 model: 1 Switch the receiver into standby. 2 While holding down the TONE button, press and hold the STANDBY/ON button for about three seconds. 3 When you see RESET? appear in the display, press the ENTER button. OK? shows in the display. 4 Press SYSTEM SETUP to confirm. OK appears in the display to indicate that the receiver has been reset to the factory default settings.
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https://www.pioneerelectronics.com/pio/pe/images/portal/cit_11221/218219113VSX515OperatingInstructions.pdf
From the manual...
Resetting the main unit Use this procedure to reset all the receiver's settings to the factory default. Use the front panel controls to do this.
VSX-515 model:
1 Switch the receiver into standby.
2 While holding down the TONE button, press and hold the STANDBY/ON button for about three seconds.
3 When you see RESET? appear in the display, press the ENTER button. OK? shows in the display.
4 Press SYSTEM SETUP to confirm. OK appears in the display to indicate that the receiver has been reset to the factory default settings.