Casio CTK-1100 Service Manual & Parts Manual page 21

DA LCD CHECK
D-1. Press the "TONE" button to select the "LCD Check".
D-(. Press the "TONE" button.
The confirmation chord sounds and the display of the LCD is lit.
D-(. Press the "TONE" button.
The confirmation chord sounds and the display of the LCD is turned off.
D-D. Press the "TONE" button.
The confirmation chord sounds and the following screen appears on the LCD.
D-D. Press the "TONE" button.
The confirmation chord sounds and the following screen appears on the LCD.
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CTK-1100