WARNING: All user stored data will be deleted. If the current settings and data are not expendable, create a backup before executing the Factory Reset. All Internal Voice, Multi, Pan, System Setup Data, and Micro Tuning Data will be deleted.
1) Turn on the power.
NOTE: All buttons must be pressed in the order mentioned in step #2 to execute the test program.
2) Press and hold down the [VOICE] button, the  button, and then the [ENTER] button.
3) Continue to hold the buttons until a dialog box appears on the display. The dialog will read TG77 TEST. Release all buttons. Inside the dialog box the option '[COPY]: Fact. Set.' will appear.
4) Press the [COPY] button to execute the Factory Reset Procedure. The test program will automatically exit and return the TG77 to Play Mode.