Casio LK-40 - Manual (Page 16)

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Power Supply
This keyboard can be powered by current from a standard household wall outlet
(using the specified AC adaptor) or by batteries. Always make sure you turn the
keyboard off whenever you are not using it.
■ Using batteries
Always make sure you turn off the keyboard before loading or replacing batteries.
To load batteries
1. Remove the battery compartment cover.
2. Load 6 AA-size batteries into the battery compartment.
• Make sure that the positive (+) and negative (–) ends
are facing correctly.
3. Insert the tabs on the battery compartment cover into the
holes provided and close the cover.
The keyboard may not function correctly if you load or replace batteries with power
turned on. If this happens, turning the keyboard off and then back on again should
return functions back to normal.
Important Battery Information
■ The following shows the approximate battery life provided by different battery
types.
• Standard battery life: Approximately 1 hour (SUM3/R6P)
Approximately 4 hours (AM3/LR6)
Both of the above values are standard battery life at normal temperature, with the
keyboard volume at a medium setting. Temperature extremes or playing at very
loud volume settings can shorten battery life.
■ Any of the following symptoms indicate low battery power. Replace batteries as
soon as possible whenever any of the following occurs.
• 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 con-
nected computer or MIDI device
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