The following procedure can be used to clear the DB-90's internal memory and load its factory settings. 

Caution: Performing a Factory Reset erases all User settings and custom memories you have stored. Be sure to write down any settings that you wish to remember.

1. Begin with the DB-90's power turned off. 

2. Press and hold the MEMORY button and turn on the power. "F" appears in the display to indicate that the reset is complete. 

3. Release the MEMORY button.