Power Supply; Using Batteries - Casio CTK-491 User Manual

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 when-
ever 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 com-
partment.
• Make sure that the positive (+) and negative (–) ends
are facing correctly.
3.
Insert the tabs on the battery compartment cov-
er into the holes provided and close the cover.
The keyboard may not function correctly if you load or re-
place batteries with power turned on. If this happens, turn-
ing the keyboard off and then back on again should return
functions back to normal.
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Important Battery Information
The following shows the approximate battery life.
Alkaline batteries .............. 4 hours*
Manganese batteries .......... 2 hours*
* The above value is standard battery life at normal tem-
perature, with the keyboard volume at medium setting.
Temperature extremes or playing at very loud volume
settings can shorten battery life.
Any of the following symptoms indicate low battery pow-
er. Replace batteries as soon as possible whenever any of
the following occurs.
• Dim power indicator
• Instrument does not turn on
• Display that is flickering, dim, or difficult to read
• Abnormally low speaker/headphone volume
• Distortion of sound output
• Occasional interruption of sound when playing at high
volume
• Sudden power failure when playing at high volume
• Flickering or dimming of the display when playing at
high volume
• Continued sound output even after you release a key
• A tone that is totally different from the one that is se-
lected
• Abnormal rhythm pattern and Song Bank play
• Loss of power, sound distortion, or low volume when
playing from a connected computer or MIDI device
<CTK-491 only>
• Distortion of microphone input
• Dim power supply indicator when a microphone is
used
• Sudden power failure when using the microphone
WARNING
Misuse of batteries can cause them to leak, resulting in damage
to nearby objects, or to explode, creating the risk of fire and per-
sonal injury. Always make sure you observe the following pre-
cautions.
• Never try to take batteries apart or allow them to become
shorted.
• Never expose batteries to heat or dispose of them by in-
cineration.
• Never mix old batteries with new ones.
• Never mix batteries of different types.
• Do not charge the batteries.
• Make sure the positive (+) and negative (–) ends of the
batteries are facing correctly.
CAUTION
Misuse of batteries can cause them to leak resulting in damage
to nearby objects, or to explode, creating the risk of fire and per-
sonal injury. Always make sure you observe the following pre-
cautions.
• Use only batteries that are specified for use with this prod-
uct.
• Remove batteries from the product if you do not plan to
use it for a long time.
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