Casio LK-40 User Manual
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Contents
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E-41 TroubleshootingBe 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 pluggedinto the keyboard.4. The POWER/MODE selec-tor is in the CASIO CHORDor FINGERED position.5. Tone “99 PERCUSSION” isselected and you are press-ing keys that are not as-signed tones.• Low battery power• No sound when keyboardkeys are pressed.• Any of the following symp-toms while using batterypower.• 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 ofsound when playing at highvolumes• Sudden power failure whenplaying at high volumes• Dimming of the displaywhen playing at high vol-ume• Abnormal rhythm patternand demo tune play• Dimming of keyboard lightswhen notes sound• Loss of power, sound distor-tion, or low volume whenplaying from a connectedcomputer or MIDI device1. Correctly attach the ACadaptor, make sure that bat-teries poles (+/–) are facingcorrectly, and check to makesure that batteries are notdead.2. Press the VOLUME but-ton.3. Unplug the headphonesfrom the PHONES/OUT-PUT jack.4. Normal play is not possibleon the accompaniment key-board while the POWER/MODE selector is set toCASIO CHORD or FIN-G E R E D . C h a n g e t h ePOWER/MODE selectorsetting to NORMAL.5. While “99 PERCUSSION” isselected, you can use onlykeys to the left of B4. Thesekeys are marked on the con-sole with illustrations ofpercussion instruments.• Replace the batteries with aset of new ones or use theAC adaptor.Technical ReferenceCauseSymptom Action478B-E-043A |
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