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Diagnosis
In Test 3, the display will show the button number which you need to press. For example, when the
display shows "F01", it indicates you need to press the first button on the right side, the [SUSTAIN]
button. If there is a button LED, the related LED will light up as well.
Check the buttons strictly in the sequence as marked in the picture below. If the currently checked button
is OK, the display will then show the next button number. Otherwise, the display will show "Err" for an
error.
For example, after pressing the [Ribbon Modes 1] button, the display will then show "F03", prompting
you to press the [Ribbon Modes 2] button. The button test range is "F01- F12".
Follow the numbers marked in Red to check the buttons, starting from "1".
After all buttons are passed, the display will show "PAS", as shown in the picture below. Now, hold down
the [SUSTAIN] button, then press [OCT+] to switch to Test 4 (Keys).
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