© 2023 CASIO COMPUTER CO., LTD.
MA2304-A
User’s Guide
Watch
5727 EN
Congratulations upon your selection of this CASIO watch.
To ensure that this watch provides you with the years of service for which it is designed,
carefully read and follow the instructions in this manual, especially the information under
“Operating Precautions” and “User Maintenance”.
• Your watch may differ somewhat from the one shown in the illustration.
Before Using the Watch for the First Time
Crown
Spacer
• Depending on your watch model, there may be a spacer installed
at the factory around the crown. If your watch has a spacer, you
should remove the spacer before using the watch.
• After removing the spacer, use the procedures in “Crown
Operations” and “To adjust the time setting” to set up the watch
for use.
Charging the Watch
When you are not wearing the watch, leave it where its face
(solar cell) is exposed to bright light for charging.
To help ensure stable operation, expose the face of the watch
to about a half day of direct sunlight each month to charge it.
YES NO
While wearing the watch, take care so your sleeve does not
block its face (solar cell) from light. Charging efficiency may
be reduced if the face (solar cell) is blocked from light, even
partially.
Warning!
Some light sources and environments can cause the watch to become extremely
hot during charging, which creates the risk of burn injury and damage to internal
watch components.
Avoid charging the watch under conditions like the ones described below, where
the temperatures may exceed 60°C (140°F).
• On the dashboard of a vehicle parked in the sun
• Near incandescent lamps, camera lights, halogen lamps, or other sources of heat
• In locations exposed to direct sunlight for long periods and other hot locations
Low Charge and Dead Battery Conditions
An alert operation is performed when the battery charge goes low.
Low Battery Alert
The second hand will jump at two-second intervals to alert you when the charge is low.
2-second jump
Low charge
Regular Timekeeping Low Battery Alert
Charged
Charging Time
The times below are general guidelines for reference only.
Charging Time to Support Daily Use
Exposure Level (Brightness) Approximate Charging Time
Outdoor sunlight (50,000 lux) 9 minutes
Sunlight through a window (10,000 lux) 17 minutes
Daylight through a window on an overcast day (5,000 lux) 35 minutes
Indoor fluorescent lighting (500 lux) 8 hours
Charging Time to Recover from Dead Battery
Exposure Level (Brightness)
Approximate
Charging Time to
1-second Hand
Movement
Approximate Time to
Full Charge
Outdoor sunlight (50,000 lux) 2.5 hours 25 hours
Sunlight through a window (10,000 lux) 4 hours 60 hours
Daylight through a window on an overcast
day (5,000 lux)
8 hours 110 hours
Indoor fluorescent lighting (500 lux) 110 hours – – –
Note
• Actual charging time depends on environmental conditions.
Quick Start
Timekeeping will stop if rechargeable battery power drops to zero. However, Quick Start
will resume timekeeping after the watch is exposed to light for a little while.
• Though timekeeping will resume virtually immediately, it will stop again if exposure to
light is stopped too soon.
• The actual amount of time it takes for timekeeping to resume after exposure to light
depends on the brightness of the light.
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