MT-300, MT-300S: Initializing - Restoring the Factory Settings
The following procedure can be used to clear the internal memory and reload the factory settings:
(CAUTION: All USER information will be lost. Be sure to back up any information you wish to keep.)
1. Press MENU.
2. Use the VALUE DIAL to select 13:Factory Preset.
3. Press ENTER/TRANSPOSE twice.
4. Turn the power off and then back on again.