Casio LK-125 Service Manual & Parts Manual page 20

B. BUTTON CHECK
B-1. Press the "0" button to select the "Button Check".
B-2. Press the keys in the order of the numbers indicated in the illustration below.
If the button function is OK:
The confirmation chord sounds, and the button number and "OK" appear on the LCD.
If a button function is not operating properly or a button is pressed in a wrong order:
The error tone sounds, and the button number and "NG" appear on the LCD.
NOTE: You cannot cancel this check procedure mid-way.
01 02
B-3. When the "SPEAK" button is pressed at the end, the confirmation chord sounds and "SWITCHOK"
appears on the LCD.
C. ROM VERSION CHECK
C-1. Press the "1" button to perform the "ROM Version Check".
The ROM version appears on the LCD.
C-2. Check that the ROM version is "821VR100".
03 04 07 08 09
05 06 10 11 12 13
– 18 –
15
14
23
22
24 25 26
LK-125
17
16 18
21 19
20