Casio LK-125 Service Manual & Parts Manual page 23

G. KEY CHECK
NOTE: Perform the tests with regular power-on state.
G-1. Check the following points by pressing all keys.
• The tones sound correctly by hitting keys.
• The pitch of the sound corresponding to a key is correct.
• Hitting a key does not produce two tones or make sounds twice.
• The stroke and the load of keys are normal.
• The difference in height and the gap between keys are even.
NOTE: Press the keys in the order shown in the illustration below.
H. HEADPHONES CHECK
NOTE:
Perform the tests with regular power-on state.
H-1. Connect the headphones to the PHONES/OUTPUT jack.
H-2. Press any key and check that you can hear the sound through the headphones.
H-3. Remove the headphones.
H-4. Press any key and check that sounds come out from the speakers.
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LK-125