Casio 5261 Operation Guide
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MA1112-EA
Operation Guide 5261
About This Manual
Button operations are indicated using the letters A
through D shown in the illustration.
Hand Functions
Hour Hand
Second Hand
Minute Hand
E-2
2. Check the Home City and the daylight saving time (DST) setting.
Use the procedure under “To confi gure Home City settings” (page E-34) to confi gure
your Home City and daylight saving time settings.
Important!
Proper time calibration signal reception and World Time settings depend on correct
Home City, time, and date settings in the Timekeeping Mode. Make sure you
confi gure these settings correctly.
3. Set the current time.
x To set the time using a time calibration signal
See “To get ready for a receive operation” (page E-23).
x To set the time manually
See “Confi guring Current Time and Date Settings Manually” (page E-38).
Left Dial Hand: Indicates the current mode.
Lower Dial Hand
Right Dial Hands
Day Indicator
This User’s Guide uses numbers shown above to identify
watch hands and indicators.
Congratulations upon your selection of this CASIO watch.
This watch does not have a city code that corresponds to the UTC offset of –3.5
hours. Because of this, the radio-controlled atomic timekeeping function will not
display the correct time for Newfoundland, Canada.
Note that CASIO COMPUTER CO., LTD. assumes no responsibility for any damage
or loss suffered by you or any third party arising through the use of this product or
its malfunction.
Things to check before using the watch
1. Hold down C at least two seconds to enter the Timekeeping Mode, and then
ENGLISH
observe the movement of the
Is the x Second Hand moving smoothly at one-second intervals?
Is the x Second Hand moving at
two-second intervals or is it stopped
completely?
Power is low. Charge the watch by placing
it in a location where it is exposed to light.
For details, see “Charging the Watch”
(page E-10).
The watch is now ready for use.
x
For details about the watch’s radio controlled timekeeping feature, see “Radio
Controlled Atomic Timekeeping” (page E-18).
NO
YES
Second Hand.
The watch is charged suffi ciently.
For details about charging, see
“Charging the Watch” (page E-10).
Go to step 2.
YES
NEXT
E-1
E-3
E-4
Contents
E-2 About This Manual
E-3 Things to check before using the watch
E-10 Charging the Watch
E-17 To recover from the sleep state
E-18 Radio Controlled Atomic Timekeeping
E-23 To get ready for a receive operation
E-26 To perform manual receive
E-28 To check the result of the latest receive operation
E-30 Mode Reference Guide
E-31 To determine the watch’s current mode
E-31 To return to the Timekeeping Mode from any other mode
E-32 To select a mode
E-6
E-47 Using the Countdown Timer
E-48 To specify the countdown start time
E-49 To perform a countdown timer operation
E-50 To stop the alarm
E-51 Checking the Current Time in a Different Time Zone
E-52 To view the time in another time zone
E-53 To specify standard time or daylight saving time (DST) for a city
E-55 To swap your Home City and World Time City
E-57 Using the Alarm
E-58 To change the alarm time setting
E-58 To turn the alarm on or off
E-58 To stop the alarm
E-59 Auto Correction of Hand Home Positions
E-8
E-60 To trigger auto correction of hand home positions
E-33 Timekeeping
E-34 Confi guring Home City Settings
E-34 To confi gure Home City settings
E-36 To toggle the Home City time between standard time and daylight
E-38 Confi guring Current Time and Date Settings Manually
E-44 Using the Stopwatch
E-62 Adjusting Home Positions Manually
E-67 Troubleshooting
E-76 Specifi cations
saving time
E-38 To change the current time setting manually
E-41 To change the current date setting manually
E-45 To perform elapsed time measurement
E-45 To perform an elapsed time operation
E-45 To pause at a split time
E-63 To adjust home positions manually
E-5
E-7
E-9
Operation Guide 5261
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Charging the Watch
The face of the watch is a solar panel that generates power from light. The generated
power charges a built-in rechargeable battery, which powers watch operations. The
watch charges whenever it is exposed to light.
Charging Guide
E-10
Power Levels
Moves at two-second
intervals.
E-12
Power Recovery Mode
The watch is designed to go into a power recovery mode that stops hand operation
temporarily whenever power suddenly drops below a certain level due to overuse
of the alarm tone over a short period. Note that all operations are disabled while the
watch is in the power recovery mode.
The hands will move to the correct positions and the watch will resume normal
operation after power recovers (in about 15 minutes). Putting the watch in a location
where it is exposed to light will help power to recover sooner.
E-14
Whenever you are not
wearing the watch, be sure
to leave it in a location
where it is exposed to light.
Best charging
x
performance is achieved
by exposing the watch to
light that is as strong as
possible.
When wearing the watch,
make sure that its face is
not blocked from light by the
sleeve of your clothing.
The watch may enter a
x
sleep state (page E-16) if
its face is blocked by your
sleeve even only partially.
You can get an idea of the watch’s power level by
observing the movement of the
Timekeeping Mode. See “Hand Movement and Function
Status” (page E-13).
If the
Second Hand is moving normally at one-second
intervals, power is at Level 1.
Low Battery Alert
If the
Second Hand is moving at two-second intervals,
power is at Level 2, which is quite low. Expose the watch to
light as soon as possible so it can charge.
Second Hand in the
Warning!
Leaving the watch in bright light for charging 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
x
Too close to an incandescent lamp x
Under direct sunlight x
Important!
x
Keep the watch in an area normally exposed to bright light when storing it for long
periods. This helps to ensure that power does not run down.
Storing the watch for long periods in an area where there is no light or wearing it in x
such a way that it is blocked from exposure to light can cause power to run down.
Make sure that the watch is exposed to bright light whenever possible.
E-11
Hand Movement and Function Status
Level Hand Movement Function Status
1 Normal. All functions enabled.
xx Second Hand moving at two-second
2
intervals.
mm Day Indicator changes to 1 (home position).
xx Second Hand stopped.
3
zz Hour Hand and cc Minute Hand stopped
at 12 o’clock.
When power drops to Level 3, all functions will be disabled but the watch will x
continue to keep time internally for about one week. If you recharge the battery
suffi ciently during this period, the analog hands will move automatically to the
correct setting and regular timekeeping will resume. After one week, all settings
(including timekeeping) will be cleared. Recharging the battery will reset all settings
to their initial factory defaults.
Beeper, time calibration signal
reception, and countdown timer
operation disabled.
All functions disabled.
E-13
Charging Times
Exposure Level (Brightness)
Outdoor sunlight (50,000 lux) 8 minutes 2 hours 23 hours
Window sunlight (10,000 lux) 30 minutes 6 hours 85 hours
Window sunlight on cloudy day
(5,000 lux)
Indoor fl uorescent lighting (500 lux) 8 hours 92 hours – – –
1 Approximate exposure each day to generate power for normal daily operation. *
2 Approximate amount exposure time required to take power up one level. *
The above exposure times all are for reference only. Actual exposure times depend
x
on lighting conditions.
For details about the operating time and daily operating conditions, see the “Power x
Supply” section of the Specifi cations (page E-77).
Daily
Operation
*1
48 minutes 8 hours 138 hours
Level Change *2
Level 3 Level 2 Level 1
E-15
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”.
x
Elapsed Time in Dark Operation
60 to 70 minutes (second hand
sleep)
6 or 7 days (function sleep)
The watch will not enter a sleep state between 6:00 a.m. and 9:59 p.m. If the watch x
is already in a sleep state when 6:00 a.m. arrives, however, it will remain in the
sleep state.
The watch will not enter a sleep state while it is in the Stopwatch Mode or
x
Countdown Timer Mode.
E-16
xx Second Hand only stopped at 12 o’clock, all other
functions enabled
All functions, including analog timekeeping, disabled x
Internal timekeeping maintained x
Radio Controlled Atomic Timekeeping
This watch receives a time calibration signal and updates its time setting accordingly.
However, when using the watch outside of areas covered by time calibration signals,
you will have to adjust the settings manually as required. See “Confi guring Current
Time and Date Settings Manually” (page E-38) for more information.
This section explains how the watch updates its time settings when the city code
selected as the Home City is in Japan, North America, Europe, or China, and is one
that supports time calibration signal reception.
E-18
To recover from the sleep state
Move the watch to a well-lit area or press any button.
If your Home City Code setting is this:
LONDON (LON), PARIS (PAR), ATHENS (ATH) Anthorn (England), Mainfl ingen (Germany)
HONG KONG (HKG) Shangqiu City (China)
TOKYO (TYO) Fukushima (Japan), Fukuoka/Saga (Japan)
HONOLULU (HNL), ANCHORAGE (ANC),
LOS ANGELES (LAX), DENVER (DEN),
CHICAGO (CHI), NEW YORK (NYC)
Important!
x HONOLULU (HNL) and ANCHORAGE (ANC) are quite far
The areas covered by
from the calibration signal transmitters, so certain conditions may cause reception
problems.
When
x HONOLULU (HNL) or HONG KONG (HKG) is selected as the Home City,
only the time and date are adjusted according to the time calibration signal. You
need to switch manually between standard time and daylight saving time (DST) if
required. See “To toggle the Home City time between standard time and daylight
saving time” (page E-36) for information about how to do this.
The watch can receive the signal from
the transmitter located here:
Fort Collins, Colorado (United States)
E-17
E-19
Operation Guide 5261
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Approximate Reception Ranges
UK and German Signals North American Signal
Anthorn
500 kilometers
1,500 kilometers
The Anthorn signal is receivable
within this area.
Mainfl ingen
2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins
Japanese Signals Chinese Signal
Fukushima
500 kilometers
Fukuoka/Saga
1,000 kilometers
Changchun500 kilometers
1,500 kilometers
Beijing
Shangqiu
Shanghai
Chengdu
Hong Kong
E-20
Signal reception may not be possible at the distances noted below during certain x
times of the year or day. Radio interference may also cause problems with
reception.
Mainfl ingen (Germany) or Anthorn (England) transmitters: 500 kilometers (310
−
miles)
Fort Collins (United States) transmitter: 600 miles (1,000 kilometers)
−
Fukushima or Fukuoka/Saga (Japan) transmitters: 500 kilometers (310 miles) −
Shangqiu (China) transmitter: 500 kilometers (310 miles) −
As of December 2010, China does not use Daylight Saving Time (DST). If China x
does go to the Daylight Saving Time system in the future, some functions of this
watch may no longer operate correctly.
Using this watch in a country covered by a time calibration that is different from the
x
countries it supports may result in incorrect time indication due to local application
of summer time, etc.
E-22
Signal reception may be diffi cult or even impossible under the conditions x
described below.
Inside or
among
buildings
E-24
Inside a
vehicle
Near
household
appliances,
offi ce
equipment,
or a mobile
phone
Near a
construction
site, airport,
or other
sources of
electrical
noise
Near
high-tension
power lines
Among
or behind
mountains
To get ready for a receive operation
Confi rm that the watch is in the Timekeeping Mode. If it isn’t, hold down 1. C at least
two seconds to enter the Timekeeping Mode.
Place the watch in a location where signal reception is good.2.
12 o’clock
or
What you should do next depends on whether you are using Auto Receive or 3.
Manual Receive.
Auto Receive: Leave the watch over night in the location you selected in step 2.
x
See “Auto Receive” on page E-25 for details.
Manual Receive: Perform the operation under “To perform manual receive” on x
page E-26.
Auto Receive
x
With Auto Receive, the watch performs the receive operation each day
automatically up to six times (up to fi ve times for the Chinese calibration signal)
between the hours of midnight and 5 a.m. (according to the Timekeeping Mode
time). When any receive operation is successful, none of the other receive
operations for that day are performed.
When a calibration time is reached, the watch will perform the receive operation
x
only if it is in the Timekeeping Mode or World Time Mode. The receive operation is
not performed if a calibration time is reached while you are confi guring settings.
x
Position the watch as shown in the
nearby illustration, with 12 o’clock
pointed towards a window. Make sure
there are no metal objects nearby.
Signal reception normally is better x
at night.
The receive operation takes from two x
to seven minutes, but in some cases
it can take as long as 14 minutes.
Take care that you do not perform
any button operation or move the
watch during this time.
E-21
E-23
E-25
To perform manual receive
In the Timekeeping Mode, keep 1. A depressed (for about two seconds) as the
Second Hand goes through the following sequence.
Moves to x YES (or Y for some models) or NO (N) to indicate the last signal
reception result, then to READY (R).
Second Hand indicates the operations the watch is currently performing.
The 2.
When the xx Second
Hand is pointed here:
READY (R) Watch is setting up for reception.
WORK (W) Reception is in progress.
E-26
YES (Y)
NO (N) Reception failed for some reason.
If signal reception is unstable, the x xx Second Hand
may move between WORK (W) and READY (R).
To check the result of the latest receive operation
In the Timekeeping Mode, press A.
xx Second Hand will move to YES (Y) for fi ve
The
seconds if the latest receive operation was successful,
or NO (N) if it was not. After that, regular timekeeping
will resume.
You can return to the Timekeeping Mode manually by
x
pressing A while the x Second Hand is pointing to YES
(Y) or NO (N).
Note
xx Second Hand will indicate NO (N) if you have
The
adjusted the time or date setting manually since the
latest receive operation.
It means this:
Reception was completed
successfully.
Radio-controlled Atomic Timekeeping Precautions
x
Strong electrostatic charge can result in the wrong time setting.
Even if a receive operation is successful, certain conditions can cause the time x
setting to be off by up to one second.
The watch is designed to update the date and day of the week automatically for x
the period January 1, 2000 to December 31, 2099. Updating of the date by signal
reception will no longer be performed starting from January 1, 2100.
x
If you are in an area where signal reception is not possible, the watch keeps time
with the precision noted in “Specifi cations” (page E-76).
The receive operation is disabled under any of the following conditions. x
While power is at Level 2 or lower (page E-12) −
While the watch is in the power recovery mode (page E-14) −
When the watch is in the function sleep state (power saving, page E-16) −
While a countdown time operation is in progress (page E-47) −
A receive operation is cancelled if an alarm sounds while it is being performed. x
The receive operation is complete when the 3.
Hand moves to YES (Y) or NO (N) for about fi ve
seconds, and then resumes regular timekeeping.
You can return to the Timekeeping Mode manually by
x
pressing A while the x Second Hand is pointing to
YES (Y) or NO (N).
When the receive operation is successful, the watch
x
adjusts the time setting accordingly. It does not adjust
the setting if the operation failed.
Note
To interrupt a receive operation and return to the x
Timekeeping Mode, press any button.
Second
E-27
E-28
E-29
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