Casio LK-40 User Guide - Page 43

Technical Reference I Troubleshooting Be sure to check the following table whenever you experience problems with keyboard operation. Symptom • No sound when keyboard keys are pressed. • Any of the following symptoms 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 volume • Abnormal rhythm pattern and demo tune play • Dimming of keyboard lights when notes sound • Loss of power, sound distortion, or low volume when playing from a connected computer or MIDI device Cause 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 pressing keys that are not assigned tones. • Low battery power Action 1. Correctly attach the AC adaptor, make sure that batteries poles (+/-) are facing correctly, and check to make sure that batteries are not dead. 2. Press the VOLUME button. 3. Unplug the headphones from the PHONES/OUTPUT jack. 4. Normal play is not possible on the accompaniment keyboard while the POWER/ MODE selector is set to CASIO CHORD or FINGERED. 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 console with illustrations of percussion instruments. • Replace the batteries with a set of new ones or use the AC adaptor. 478B-E-043A E-41