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Operation Guide 5031
Important!
• 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. Make sure that the watch is exposed to bright light whenever
possible.
• This watch uses a special rechargeable battery to store power produced by the solar
cell, 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 special rechargeable battery to charge fully, contact your dealer
or CASIO distributor about having it replaced.
• The special rechargeable (secondary) battery used by your watch is not intended to
be removed or replaced by you. Use of a rechargeable battery other than the special
one specified for this watch can damage the watch.
• The current time and all other settings return to their initial factory defaults whenever
the watch is left uncharged for about one week after battery power drops to Level 3,
and when you have the battery replaced.
• Keep the watch in an area normally exposed to bright light when storing it for long
periods. This helps to keep the rechargeable battery from going dead.
Battery Power Levels
The movement of the analog hands indicates the current battery power level.
Level
Hand Movement
1
Normal.
• Second hand jumps
2
every 2 seconds.
• Day changes to home
position.
• Second hand stopped.
3
• Hour and minute hands
Jumps two seconds
stopped at 12 o'clock.
• The second hand jumping every two seconds (Level 2) indicates that battery power
is quite low. Expose the watch to light as soon as possible to charge the battery.
• When battery power is at Level 2, time calibration signal reception is disabled.
• When power drops to Level 3, all functions will be disabled but the watch will
continue to keep time internally for about one week. If you recharge the battery
sufficiently during this period, the analog hands will move automatically to the
correct setting and normal timekeeping will resume. If the watch is left uncharged for
about one week after battery power drops to Level 3, the current time and all other
settings return to their initial factory defaults.
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.
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.
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
Charging Guide
After a full charge, timekeeping remains enabled for up to about five months.
• 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.
• Stable operation is promoted by frequent charging.
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
(Brightness)
Level 3
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)
• The above exposure time values are all for reference only. Actual required exposure
times depend on lighting conditions.
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Auto Return Features
• If you do not perform any operation for about two or three minutes in the current time
setting mode, or in the hand/day home position correction mode, the watch will
return to the Timekeeping Mode automatically.
• If you do not perform any operation for about two or three minutes while a setting
mode is selected, the watch will exit the setting mode automatically.
High-Speed Movement
• In most cases when configuring settings, holding down a button will start high-speed
scrolling of the applicable setting.
• High-speed movement of hands and day will continue until you press any button.
Function Status
All functions enabled.
Time calibration signal
reception disabled.
All functions disabled.
Approximate Exposure Time
8 minutes
30 minutes
48 minutes
8 hours
Level 2
Level 1
2 hours
24 hours
6 hours
89 hours
9 hours
145 hours
98 hours
– – –
Radio-controlled Atomic Timekeeping Precautions
• Strong electrostatic charge can result in the wrong time being set.
• The time calibration signal bounces off the ionosphere. Because of this, such factors as
changes in the reflectivity of the ionosphere, as well as movement of the ionosphere to
higher altitudes due to seasonal atmospheric changes or the time of day may change
the reception range of the signal and make reception temporarily impossible.
• Even if the time calibration signal is received properly, certain conditions can cause
the time setting to be off by up to one second.
• The current time setting in accordance with the time calibration signal takes priority
over any time settings you make manually.
• The watch is designed to update the date and day of the week automatically for the
period January 1, 2000 to December 31, 2099. Setting of the date by the time
calibration signal will not be performed starting from January 1, 2100.
• This watch can receive signals that differentiate between leap years and non-leap
years.
• If you are in an area where proper time calibration signal reception is impossible, the
watch keeps time with the precision noted in "Specifications".
Timekeeping
• The year can be set in the range of 2000 to 2099.
• The watch's built-in full automatic calendar makes allowances for different month
lengths and leap years. Once you set the date, there normally should be no reason
to change it. Note, however, that if the watch is left uncharged for about one week
after battery power drops to Level 3, the current time and all other settings return to
their initial factory defaults.
• The date will change automatically when the current time reaches midnight. The
date change at the end of the month may take more time than normal.
• The current time for all time zones in the Timekeeping Mode and World Time Mode
is calculated in accordance with the Coordinated Universal Time (UTC) offset of
each zone, based on your Home Time Zone time setting.
• UTC is the world-wide scientific standard of timekeeping. It is based upon carefully
maintained atomic (cesium) clocks that keep time accurately to within microseconds.
Leap seconds are added or subtracted as necessary to keep UTC in sync with the
Earth's rotation. The reference point for UTC is Greenwich, England.
Power Saving
Power Saving enters a sleep state automatically whenever the watch is left for a
certain period in an area where it is dark. The table below shows how watch functions
are affected by Power Saving.
• There actually are two sleep state levels: "second hand sleep" and "function sleep".
Elapsed Time in Dark
60 to 70 minutes
Second hand only is stopped, all other functions are
(second hand sleep)
enabled.
• All functions, including analog timekeeping, disabled
6 or 7 days
• Internal timekeeping maintained
(function sleep)
• Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.
• The watch will not enter the sleep state between 6:00 AM and 9:59 PM. If the watch
is already in the sleep state when 6:00 AM arrives, however, it will remain in the
sleep state.
To recover from the sleep state
Perform any one of the following operations.
• Move the watch to a well-lit area.
• Press any button.
Specifications
Accuracy at normal temperature: ± 15 seconds a month (with no signal calibration)
Timekeeping: Hour, minutes (hand moves every 10 seconds), seconds, 24-hour, day,
day of the week
Calendar system: Full Auto-calendar pre-programmed from the year 2000 to
2099
Other: Home City code (can be assigned one of 29 city codes and Universal
Coordinated Time); Daylight Saving Time (summer time) / Standard Time
Time Calibration Signal Reception: Auto receive up to six times a day (5 times a
day for the Chinese calibration signal) (Remaining auto receives
cancelled as soon as one is successful); Manual receive
Receivable Time Calibration Signals:
Mainflingen, Germany (Call Sign: DCF77, Frequency: 77.5 kHz); Anthorn,
England (Call Sign: MSF, Frequency: 60.0 kHz); Fukushima, Japan (Call
Sign: JJY, Frequency: 40.0 kHz); Fukuoka/Saga, Japan (Call Sign: JJY,
Frequency: 60.0 kHz); Fort Collins, Colorado, the United States (Call
Sign: WWVB, Frequency: 60.0 kHz); Shangqiu City, Henan Province,
China (Call Sign: BPC, Frequency: 68.5 kHz)
Stopwatch: Measuring capacity: 23:59'59.95''
Measuring unit: 1/20 second
Measuring mode: Elapsed time, split time
World Time: 29 time zones (29 cities + coordinated universal time)
Other: Standard Time/Daylight Saving Time (summer time); Home City/World
Time City swapping
Other: Power Saving, auto hand home position correction
Power Supply: Solar cell and one rechargeable battery
Approximate battery operating time: 5 months (no exposure to light; one signal
reception of approximately 4 minutes per day)
City Code Table
City
City
UTC Offset/
Code
GMT Differential
PPG
Pago Pago
–11
HNL
Honolulu
–10
ANC
Anchorage
–9
LAX
Los Angeles
–8
DEN
Denver
–7
CHI
Chicago
–6
NYC
New York
–5
SCL
Santiago
–4
RIO
Rio De Janeiro
–3
FEN
Fernando de Noronha
–2
RAI
Praia
–1
UTC
0
LON
London
PAR
Paris
+1
ATH
Athens
+2
• Based on data as of June 2008.
• The rules governing global times (UTC offset and GMT differential) and summer
time are determined by each individual country.
Operation
City
City
UTC Offset/
Code
GMT Differential
JED
Jeddah
+3
THR
Tehran
+3.5
DXB
Dubai
+4
KBL
Kabul
+4.5
KHI
Karachi
+5
DEL
Delhi
+5.5
DAC
Dhaka
+6
RGN
Yangon
+6.5
BKK
Bangkok
+7
HKG
Hong Kong
+8
TYO
Tokyo
+9
ADL
Adelaide
+9.5
SYD
Sydney
+10
NOU
Noumea
+11
WLG
Wellington
+12
5
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