Casio CTK-2300 Service Manual page 9

6. LCD check
1 Press "TONE" button.
2 Press "TONE" button.
*Pip sound must be audible.
The display must be changed to turn on all dots.
3 Press "TONE" button.
The display must be changed to no display.
4 Press "TONE" button.
The display must be changed to pattern 1 dot matrix.
5 Press "TONE" button.
The display must be changed to pattern 2 dot matrix.
6 Press "TONE" button.
The display must be changed to pattern 1 characters.
7 Press "TONE" button.
The display must be changed to pattern 2 characters.
8 Press "TONE" button.
The display must be changed to as remark.
7. AC Adaptor check
1 Press "SONG BANK" button.
OK sound must be audible.
8. APO check
1 Press "STOP" button.
* Go out from TEST mode (Power off).
* The LCD turns off.
DIAGNOSTIC PROGRAM IS FINISHED.
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Message on LCD
LCD
TEST
P=AC ADP