Sony KLV-21SR2 - Manual (Page 40)

40
Using Advanced Features
5
Repeat steps 3 and 4 to adjust other options.
6
Press MENU to exit the menu screen.
To reset to the factory settings
Press RESET while the menu is on the screen and
the cursor is located on the right side of any menu
item.
Note
Resetting the unit to the factory settings resets only Treble, Bass
and Balance.