Casio CTK-4200 Service Manual page 30

E. ROM VERSION & MODEL CHECK
E-1. Press the "9" button to perform the "ROM VERSION CHECK".
The ROM version appears on the LCD.
E-2. Check that the ROM version is "19083".
E-3. Press the "9" button to perform the "MODEL CHECK".
The model name appears on the LCD.
E-4. Check that the model name is "MX826".
E-5. Press the "0" button to return to the main screen.
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CTK-4200