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补充一个：
1) Turn the power on.
2) While pressing the [VOICE] button, press and hold the [BANK D] button, then the [8] button. The SY77 will run the INITIAL TEST routine and display the Test Program Menu.
3) Press the [COPY] button. The SY77 will execute Test 48 'Factory Settings', automatically exit the test mode, and then return to play mode.
1) Turn the power on.
2) While pressing the [VOICE] button, press and hold the [BANK D] button, then the [8] button. The SY77 will run the INITIAL TEST routine and display the Test Program Menu.
3) Press the [COPY] button. The SY77 will execute Test 48 'Factory Settings', automatically exit the test mode, and then return to play mode.