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Timekeeping - Casio 3278 Operation Manual

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Operation Guide 3278/3279
Storing the watch for long periods in an area where there is no light or wearing it in
such a way that it is blocked from exposure to light can cause rechargeable battery
power to run down. Be sure that the watch is exposed to bright light whenever
This watch uses a rechargeable battery to store power produced by the solar panel,
so regular battery replacement is not required. However, after very long use, the
rechargeable battery may lose its ability to achieve a full charge. If you experience
problems getting the rechargeable battery to charge fully, contact your dealer or
CASIO distributor about having it replaced.
Never try to remove or replace the watch's rechargeable battery yourself. Use of the
wrong type of battery can damage the watch.
All data stored in memory is deleted, and the current time and all other settings
return to their initial factory defaults whenever battery power drops to Level 5 (pages
E-61and E-62) and when you have the battery replaced.
Turn on the watch's Power Saving function (page E-85) and keep it in an area
normally exposed to bright light when storing it for long periods. This helps to keep
the rechargeable battery from going dead.
The flashing
indicator at Level 3 tells you that battery power is very low, and
that exposure to bright light for charging is required as soon as possible.
At Level 5, all functions are disabled and settings return to their initial factory
defaults. Once the battery reaches Level 2 after falling to Level 5, reconfigure the
current time, date, and other settings.
The watch's Home City code setting will change automatically to TYO (Tokyo)
whenever the battery drops to Level 5. With this Home City code setting, the watch is
configured to receive the time calibration signals of Japan. If you are using the watch
in North America or Europe, or China you will need to change the Home City code
setting to match your location whenever the battery drops to Level 5.
Display indicators reappear as soon as the battery is charged from Level 5 to Level 2.
Leaving the watch exposed to direct sunlight or some other very strong light source
can cause the battery power indicator to show a reading temporarily that is higher
than the actual battery level. The correct battery level should be indicated after a few
Charging Precautions
Certain charging conditions can cause the watch to become very hot. Avoid leaving
the watch in the areas described below whenever charging its rechargeable battery.
Also note that allowing the watch to become very hot can cause its liquid crystal
display to black out. The appearance of the LCD should become normal again when
the watch returns to a lower temperature.
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.
The watch can become particularly hot when exposed to the following
conditions for long periods.
On the dashboard of a car parked in direct sunlight
Too close to an incandescent lamp
Under direct sunlight
Recovery Times
The table below shows the amount exposure that is required to take the battery from
one level to the next.
Exposure Level
Approximate Exposure Time
Level 5
Level 4
Outdoor Sunlight
2 hours
(50,000 lux)
Sunlight Through a
8 hours
Window (10,000 lux)
Daylight Through a
16 hours
Window on a Cloudy
Day (5,000 lux)
Indoor Fluorescent
183 hours
Lighting (500 lux)
The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
To set the time and date manually
1. In the Timekeeping Mode, hold down A until the city
code starts to flash, which indicates the setting screen.
2. Press D and B to select the city code you want.
Make sure you select your Home City code before
changing any other setting.
For full information on city codes, see the "City Code
Table" at the back of this manual.
3. Press C to move the flashing in the sequence shown below to select the other
City Code
Power Saving
Operation Tone
Level 3
Level 2
Level 1
21 hours
6 hours
105 hours
29 hours
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
Battery Power Indicator and Recover Indicator
The battery power indicator on the display shows you the current status of the
rechargeable battery's power.
Battery Power Indicator
Battery power
(Charge Soon Alert)
Performing illumination, or beeper operations during a
Recover indicator
short period may cause the recover indicator to appear
on the display. Illumination, alarm, countdown timer
alarm, hourly time signal operations and receive
operation will be disabled until battery power recovers.
After some time, battery power will recover and the
recover indicator will disappear, indicating that the
above functions are enabled again.
If the recover indicator appears frequently, it probably
means that remaining battery power is low. Leave the
watch in bright light to allow it to charge.
Charging Guide
The following table shows the amount of time the watch needs to be exposed to light
each day in order to generate enough power for normal daily operations.
Exposure Level (Brightness)
Outdoor Sunlight (50,000 lux)
Sunlight Through a Window (10,000 lux)
Daylight Through a Window on a Cloudy Day (5,000 lux)
Indoor Fluorescent Lighting (500 lux)
For details about the battery operating time and daily operating conditions, see the
"Power Supply" section of the Specifications (page E-95).
Stable operation is promoted by frequent exposure to light.


Press B button to view the current tide site name setting.
Current Time
Day of week
Month – Day
Use the Timekeeping Mode to set and view the current
time and date.
Read This Before You Set the Time and Date!
This watch is preset with a number of city codes, each of
which represents the time zone where that city is located.
Hour : Minutes
When setting the time, it is important that you first select
the correct city code for your Home City (the city where
PM indicator
you normally use the watch). If your location is not
included in the preset city codes, select the preset city
Tide site name
code that is in the same time zone as your location.
Note that all of the times for the World Time Mode city
codes (page E-41) are displayed in accordance with the
time and date settings you configure in the Timekeeping
The following steps explain how to configure timekeeping settings only.
4. When the timekeeping setting you want to change is flashing, press D or B to
change it as described below.
To do this:
Change the city code
Cycle between Auto DST (
Saving Time (
) and Standard Time
Toggle between 12-hour (
hour (
) timekeeping
Reset the seconds to
Change the hour and minutes
Function Status
All functions enabled.
All functions enabled.
Auto and manual receive,
illumination, and beeper
Except for timekeeping and
the CHG (charge) indicator,
all functions and display
indicators disabled.
All functions disabled.
Exposure Time
5 minutes
24 minutes
48 minutes
8 hours
Do this:
Press D (east) and B
Press D.
), Daylight
Press D.
) and 24-
Press D.
Press D (+) and B (–).



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