Reference; Troubleshooting - Casio Casiotone LK-S450 User Manual

Reference

Troubleshooting

Symptom
Included Accessories
I can't find included items during
unpacking.
Power Requirements
Power does not turn on.
When P (Power) is pressed, the
display appears momentarily, but power
does not turn on.
The Digital Keyboard suddenly turns off
after outputting a loud sound.
The Digital Keyboard suddenly turns off
after about 30 minutes.
Display Name
The display keeps going dark or keeps
flickering.
Screen contents are visible only from a
fixed angle.
Sound
Nothing happens when I press a
keyboard key.
Nothing happens or notes do not play
normally when I play on the
accompaniment (left-side) keyboard.
With some songs, the left-hand part you
play on the keyboard does not sound
during song part practice (left hand or
both hands).
Required Action
Carefully check inside all of the packing materials.
• Check the AC adaptor or make sure that the batteries
are facing correctly (page EN-8).
• Replace the batteries with new ones. Or use AC
adaptor power (page EN-8).
Press P (Power) to turn power back on.
• Replace the batteries with new ones. Or use AC
adaptor power (page EN-8).
• Lower the volume of the external device.
Disable Auto Power Off (page EN-26).
Replace the batteries with new ones (page EN-9). Or
use AC adapter power (page EN-8).
This is due to the Digital Keyboard's production
limitations. It does not indicate malfunction.
• Adjust the volume level (page EN-28).
• Confirm that nothing is plugged into the PHONES/
OUTPUT jack on the back of the Digital Keyboard.
• Try turning this Digital Keyboard off and then back on
again (page EN-25) to initialize settings.
Press ACCMP to disable chord play with the
accompaniment keyboard (page EN-108).
When doing a left-hand part lesson with a song that
includes chord information (songs that have only melody
notes for right-hand part play), nothing sounds when
you play something on the left-hand part keyboard. Play
chords following the Keyboard Lighting guide.
EN-177