Operation Guide 2790
Battery
This watch is equipped with a solar cell and a rechargeable battery (secondary" Since these are the specs, we can include all the technical details.
battery) that is charged by the electrical power produced by the solar cell. The" Watch is not exposed to light
illustration shown below shows how you should position the watch for charging." Internal timekeeping
" Display on 18 hours per day, sleep state 6 hours per day
Example:Orient the watch so its
face is pointing at aSolar cell " 1 light operation (1.5 seconds) per day
light source." 10 seconds of alarm operation per day
" Stable operation is promoted by frequent charging.
" Note that charging efficiency
drops when any part of theRecovery Times
solar cell is blocked by clothing,The table below shows the amount of exposure that is required to take the battery
from one level to the next.
etc.
" The illustration shows how toExposure LevelApproximate Exposure Time
position a watch with a resin(Brightness)Level 4Level 3Level 2Level 1
band.
Important!
" Storing the watch for long periods in an area where there is no light or wearing it inOutdoor Sunlight (50,000 lux)46 hours20 hours19 hours
such a way that it is blocked from exposure to bright light can cause rechargeableSunlight Through a Window
battery power to run down. Be sure that the watch is normally exposed to bright light(10,000 lux)230 hours100 hours93 hours
whenever possible.Daylight Through a Window on a� � � 202 hours189 hours
" This watch employs a solar cell that converts light into electricity, which charges aCloudy Day (5,000 lux)
built-in rechargeable battery. Normally, the rechargeable battery should not need" The above exposure time values are all for reference only. Actual required exposure
replacement, but after very long use over a number of years, the rechargeabletimes depend on lighting conditions.
battery may lose its ability to achieve a full charge. Should you notice problems with
getting the rechargeable battery to a full charge, contact your dealer or CASIO
distributor about having the rechargeable battery replaced.
" The rechargeable battery should be replaced with a CASIO-specified ML2016Reference
battery only. Other rechargeable batteries can cause damage to the watch.This section contains more detailed and technical information about watch operation.
" All data stored in memory is deleted, and the current time and all other settingsIt also contains important precautions and notes about the various features and
return to their initial factory defaults whenever battery power drops to Level 4 andfunctions of this watch.
when you have the battery replaced.
" Turn on the watchOs Power Saving function and keep it in an area normally exposedPower Saving on Power Saving Function
to bright light when storing it for long periods. This helps to keep the rechargeableindicator When turned on, the Power Saving function automatically
battery from going dead.puts the watch into a sleep state whenever it is left in an
Battery Power Indicatorarea where it is dark while the Timekeeping Mode or Dual
The battery power indicator on the display shows you the current status of theTime Mode is selected.
rechargeable batteryOs power." The watch does not enter the sleep state while the
Stopwatch Mode is selected.
Battery Power
LevelindicatorFunction Status" The watch does not enter the sleep state while theAlarm Mode or Hand Setting Mode is selected.
All functions enabled.However, if you leave the watch in either of these
Battery power indicator 1
modes, it will automatically revert to the Timekeeping
All functions enabled.Mode after a preset amount of time. After that it will be
2 or able to enter the sleep state.
Beeper tone, display" The table below shows how watch functions are affected by the Power Saving
illumination, display, andfunction.
3buttons are disabled. Though
the hands of the watch do notElapsed Time inDisplayOperation
move, time continues to beDark
(Charge Soon Alert)kept internally.About one hourBlank, with" Display is off.
4All functions, includingPS flashing" All functions and analog timekeeping areenabled.
timekeeping, are disabled.
" Timekeeping is maintained.
" If the MID indicator starts to flash a few minutes after the display is illuminated or6 or 7 daysBlank, with" Display is off.
after the beeper sounds, it means that the battery level is about to go from Level 2PS not flashing" Beeper is disabled.
to Level 3. If this happens, avoid using display illumination and the beeper, and" Analog timekeeping is disabled, with
expose the watch to bright light to charge its battery.hands positioned at 12 oOclock.
" The flashing LO C indicator at Level 3 tells you that battery power is very low, and" Digital timekeeping is maintained.
that exposure to bright light for charging is required as soon as possible." Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.
" At Level 4, all functions are disabled and settings return to their initial factory" The watch will not enter the sleep state between 6:00 AM and 9:59 PM. If the watch
defaults. Functions are enabled once again after the rechargeable battery isis already in the sleep state when 6:00 AM arrives, however, it will remain in the
charged, but you need to set the digital time and date after the battery reachessleep state.
Level 3 (indicated by flashing LO C indicator) from Level 4. You will not be able to
set any of the other settings until the battery reaches Level 2 (no LO C indicator)To recover from the sleep state
after dropping to Level 4. When the battery returns to Level 2, the watch willPerform any one of the following operations.
automatically adjust the analog time setting to match the digital time." Move the watch to a well-lit area.
" Leaving the watch in direct sunlight or some other very strong light source can" Press any button.
cause the battery power indicator to temporarily show a reading that is higher than" Angle the watch towards your face for reading.
the actual battery level. The correct battery power indicator should appear after a
few minutes.To turn Power Saving on and off
" If you use illumination or any of the alarm functions a number of times during a shortIn the Timekeeping Mode, hold down C for about two
period, the recover (R) indicator appears on the display and the following operationsseconds to toggle Power Saving on (PS indicator
become disabled until battery power recovers.displayed) and off (PS indicator not displayed).
Illumination; Beeper tone" Note that pressing C also toggles between 12-hour
Manual adjustment of the analog time in the Hand Setting Modetimekeeping and 24-hour timekeeping.
After some time, battery power will recover and the recover (R) indicator will" The Power Saving on indicator (PS) is on the display in
disappear, indicating that the above functions are enabled again.all modes while the Power Saving is turned on.
Charging Precautions
Certain charging conditions can cause the watch to become very hot. Avoid leavingAuto return features
the watch in the areas described below whenever charging its rechargeable battery." If you leave a screen with flashing digits for two or three minutes without performing
Also note that allowing the watch to become very hot can cause its liquid crystalany operation, the watch automatically saves anything you have input up to that
display to black out. The appearance of the LCD should become normal again whenpoint and exits the setting screen.
the watch returns to a lower temperature." The watch automatically returns to the Timekeeping Mode if you do not perform any
button operation for two or three minutes in the Alarm or Hand Setting Mode.
Warning!
Leaving the watch in bright light to charge its rechargeable battery can cause it
to become quite hot. Take care when handling the watch to avoid burn injury.Scrolling
The watch can become particularly hot when exposed to the followingThe C button is used to scroll through setting screen data on the display. Holding
conditions for long periods.down this button during a scroll operation scrolls through the data at high speed.
" On the dashboard of a car parked in direct sunlight
" Too close to an incandescent lampIllumination Precautions
" Under direct sunlight" The illumination provided by the light may be hard to see when viewed under direct
sunlight.
Charging Guide" Illumination automatically turns off whenever an alarm sounds.
After a full charge, timekeeping remains enabled for up to about 11 months.
" Frequent use of the light shortens the battery operating time.
" The following table shows the amount of time the watch needs to be exposed to" Note that illumination is disabled while the analog hands are in motion to adjust in
light each day in order to generate enough power for normal daily operations.accordance with a change made to the digital time setting in the Timekeeping Mode.
Approximate
Exposure Level (Brightness)Exposure Time
Outdoor Sunlight (50,000 lux)5 minutes
Sunlight Through a Window (10,000 lux)24 minutes
Daylight Through a Window on a Cloudy Day (5,000 lux)48 minutes
Indoor Fluorescent Lighting (500 lux)8 hours
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ACEC
