Casio LK-40 Electronic Keyboard User Manual


 
E-41
Troubleshooting
Be sure to check the following table whenever you experience problems with key-
board operation.
1. Power supply problem.
2. Volume is set to 0.
3. Headphones are plugged
into the keyboard.
4. The POWER/MODE selec-
tor is in the CASIO CHORD
or FINGERED position.
5. Tone 99 PERCUSSION is
selected and you are press-
ing keys that are not as-
signed tones.
Low battery power
No sound when keyboard
keys are pressed.
Any of the following symp-
toms while using battery
power.
Dim power supply indicator
Instrument does not turn on
Dim, difficult to read display
Abnormally low speaker/
headphone volume
Distortion of sound output
Occasional interruption of
sound when playing at high
volumes
Sudden power failure when
playing at high volumes
Dimming of the display
when playing at high vol-
ume
Abnormal rhythm pattern
and demo tune play
Dimming of keyboard lights
when notes sound
Loss of power, sound distor-
tion, or low volume when
playing from a connected
computer or MIDI device
1. Correctly attach the AC
adaptor, make sure that bat-
teries poles (+/) are facing
correctly, and check to make
sure that batteries are not
dead.
2. Press the VOLUME but-
ton.
3. Unplug the headphones
from the PHONES/OUT-
PUT jack.
4. Normal play is not possible
on the accompaniment key-
board while the POWER/
MODE selector is set to
CASIO CHORD or FIN-
GERED. Change the
POWER/MODE selector
setting to NORMAL.
5. While 99 PERCUSSION is
selected, you can use only
keys to the left of B
4. These
keys are marked on the con-
sole with illustrations of
percussion instruments.
Replace the batteries with a
set of new ones or use the
AC adaptor.
Technical Reference
CauseSymptom Action
478B-E-043A