CASIO 5055 Smart Watch User Guide

: June 13, 2024
: Casio

CASIO 5055 Smart Watch

Getting Acquainted

Congratulations upon your selection of this CASIO watch. To get the most out of your purchase, be sure to read this manual carefully.

Keep the watch exposed to bright light

The electricity generated by the solar cell of the watch is stored by a built- in battery. Leaving or using the watch where it is not exposed to light causes the battery to run down. Make sure the watch is exposed to light as much as possible.

When you are not wearing the watch on your wrist, position the face so it is pointed at a source of bright light.
You should try to keep the watch outside of your sleeve as much as possible. Charging is reduced significantly if the face is only partially covered.
The watch continues to operate, even when it is not exposed to light. Leaving the watch in the dark can cause the battery to run down, which will result in some watch functions to be disabled. If the battery goes dead, you will have to re-configure watch settings after recharging. To ensure normal watch operation, be sure to keep it exposed to light as much as possible.

Battery charges in the light.

Battery discharges in the dark.

General Guide

Press C to change from mode to mode.
In any mode (except when a setting screen is on the display), press B to illuminate the display for about one second.
The actual level at which some functions are disabled depends on the watch model.
Frequent display illumination can run down the battery quickly and require charging.
The following guidelines give an idea of the charging time required to recover from a single illumination operation.
Approximately 5 minutes exposure to bright sunlight coming in through a window
Approximately about 8 hours exposure to indoor fluorescent lighting
Be sure to read “Power Supply” for important information you need to know when exposing the watch to bright light.

If the display of the watch is blank…
If the display of the watch is blank, it means that the watch’s Power Saving function has turned off the display to conserve power.

See “Power Saving Function” for more information.

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.

About This Manual

Depending on the model of your watch, display text appears either as dark figures on a light background or light figures on a dark background. All sample displays in this manual are shown using dark figures on a light background.
Button operations are indicated using the letters shown in the illustration.
Each section of this manual provides you with the information you need to perform operations in each mode. Further details and technical information can be found in the “Reference” section.

Radio-controlled Atomic Timekeeping

This watch receives a time calibration signal and updates its time setting accordingly.

This watch is designed to pick up the time calibration signals transmitted in Germany (Mainflingen), England (Anthorn), the United States (Fort Collins), China (Shangqiu), and Japan (Fukushima, Fukuoka/Saga).
See the information under “Signal Reception Troubleshooting” if you experience problems with time calibration signal reception.

Current Time Setting
This watch adjusts its time setting automatically in accordance with a time calibration signal. You also can perform a manual procedure to set the time and date, when necessary.

The first thing you should do after purchasing this watch is to specify your Home City (the city where you normally will use the watch). For more information, see “To specify your Home City”.
When using the watch outside the areas covered by the time signal transmitters, you will have to adjust the current time setting manually as required. See “To set the time and date manually” for more information about manual time settings.
The U.S. time calibration signal can be picked up by the watch while in North America. The term “North America” in this manual refers to the area that consists of Canada, the continental United States, and Mexico.
As of January 2008, China does not use Daylight Saving Time (DST). If China does go to the Daylight Saving Time system in the future, some functions of this watch may no longer operate correctly.

To specify your Home City

In the Timekeeping Mode, hold down A for about five seconds until the left dial hand points to T1 and the city code flashes on the upper display. This is the setting screen.
Press D (east) and B (west) to select the city code you want to use as your Home City.
LIS, LON : Lisbon, London
MAD, PAR, ROM, BER, STO : Madrid, Paris, Rome, Berlin, Stockholm
ATH : Athens
MOW : Moscow
HKG, BJS, TPE : Hong Kong, Beijing, Taipei
SEL, TYO : Seoul, Tokyo
HNL : Honolulu
ANC : Anchorage
YVR, LAX : Vancouver, Los Angeles
YEA, DEN: Edmonton, Denver
MEX, CHI : Mexico City, Chicago
MIA, YTO, NYC : Miami, Toronto, New York
YHZ : Halifax
YYT : St.Johns
Press A twice to exit the setting screen.
• Normally, your watch should show the correct time as soon as you select your Home City code. If it does not, it should adjust automatically after the next auto receive operation (in the middle of the night). You also can perform manual receive or you can set the time manually.
• The watch will receive the time calibration signal automatically from the applicable transmitter (in the middle of the night) and update its settings accordingly. For information about the relationship between city codes and transmitters, see “Important!” under “Time Calibration Signal Reception” and “Transmitters”.
• See the maps under “Approximate Reception Ranges” for information about the reception ranges of the watch.

Time Calibration Signal Reception
There are two different methods you can use to receive the time calibration signal: auto receive and manual receive.

Auto Receive
With auto receive, the watch receives the time calibration signal automatically up to six times a day (five times for the China signal). When any auto receive is successful, the remaining auto receive operations are not performed. For more information, see “About Auto Receive”.
Manual Receive
Manual receive lets you start a time calibration receive operation with the press of a button. For more information, see “To perform manual receive”.

Important!

When getting ready to receive the time calibration signal, position the watch as shown in the nearby illustration, with its 12 o’clock side facing towards a window. This watch is designed to receive a time calibration signal late at night. Because of this, you should place the watch near a window as shown in the illustration when you take it off at night. Make sure there are no metal objects nearby.
Make sure the watch is facing the right way.
Proper signal reception can be difficult or even impossible under the conditions listed below.
Inside or among buildings

Inside a vehicle

Near household appliances, office 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

Signal reception normally is better at night than during the day.
Time calibration signal reception takes from two to seven minutes, but in some cases it can take as long as 14 minutes. Take care that you do not perform any button operations or move the watch during this time.
The time calibration signal the watch will attempt to pick up depends on its current Home City code setting as shown below.
Home City Code| Transmitter| Frequency
---|---|---
LON , PAR , BER , ATH , LIS, MAD , ROM , STO , MOW*| Anthorn (England)| 60.0 kHz
Mainflingen (Germany)| 77.5 kHz
HKG , BJS| Shangqiu City (China)| 68.5 kHz
TPE , TYO , SEL| Fukushima (Japan)| 40.0 kHz
Fukuoka/Saga (Japan)| 60.0 kHz
HNL* , ANC* , LAX , DEN , CHI , NYC , YVR , YEA , MEX , MIA , YTO , YHZ , YYT| Fort Collins, Colorado (the United States)| __

60.0 kHz

- The areas covered by the HNL, ANC, and MOW city codes are quite far from the time calibration signal transmitters, and so certain conditions may cause problems with signal reception.
Calibration signal reception is disabled while a countdown timer operation is in progress.

Approximate Reception Ranges

Signals are receivable in the Taiwan area when reception conditions are good

Signal reception may not be possible at the distances that are futurer than those noted below during certain times of the year or day. Radio interference may also cause problems with reception.
Mainflingen (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: 1500 kilometers (910 miles)
Even when the watch is within the reception range of the transmitter, signal reception will be impossible if the signal is blocked by mountains or other geological formations between the watch and signal source.
Signal reception is affected by weather, atmospheric conditions, and seasonal changes.

About Auto Receive
The watch receives the time calibration signal automatically up to six times a day (five times for the China signal). When any auto receive is successful, the remaining auto receive operations are not performed. The reception schedule (calibration times) depends on your currently selected Home City, and whether standard time or Daylight Saving Time is selected for your Home City.

Your Home City	Auto Receive Start Times
1	2
LON LIS	Standard Time Daylight Saving Time
2:00 am	2:00 am
3:00 am	3:00 am
4:00 am	4:00 am
5:00 am	5:00 am Midnight*
PAR BER MAD ROM STO	Standard Time Daylight Saving Time

SEL

| Standard Time| Midnight| 1:00 am| 2:00 am| 3:00 am| 4:00 am| 5:00 am
HNL ANC LAX DEN CHI NYC YVR YEA MEX MIA YTO YHZ

YYT

| Standard Time and Daylight Saving Time| Midnight| 1:00 am| 2:00 am| 3:00 am| 4:00 am| 5:00 am

Note

When a calibration time is reached, the watch will receive the calibration signal only if it is in either the Timekeeping Mode or World Time Mode. Reception is not performed if a calibration time is reached while you are configuring settings.
Auto receive of the calibration signal is designed to be performed early in the morning, while you sleep (provided that the Timekeeping Mode time is set correctly). Before going to bed for the night, remove the watch from your wrist, and put it in a location where it can receive the signal easily.
The watch receives the calibration signal for two to 14 minutes everyday when the time in the Timekeeping Mode reaches a calibration time. Do not perform any button operation within 14 minutes before or after the calibration times. Doing so can interfere with correct calibration.
Remember that reception of the calibration signal depends on the current time in your Home City, as kept in the Timekeeping Mode.

To Perform Manual Receive

Place the watch on a stable surface so its 12 o’clock side is facing towards a window.
In the Timekeeping Mode, hold down A for about two seconds until the watch beeps.
The digital display will go blank, and the left dial hand will move to R (READY). This indicates that the watch is getting ready for time calibration signal reception.

See the information under “Signal Reception Troubleshooting” if you experience problems.
The left dial hand will move to W (WORK) and stay there while actual reception is in progress.
If signal reception is unstable during reception, the left dial hand may move between W (WORK) and R (READY).
The hour and minute hands continue to keep time normally Time calibration signal reception takes from two to 7 minutes, but in some cases it can take as long as 14 minutes. Take care that you do not perform any button operations or move the watch during this time.
When signal receive operation is successful, GET appears on the upper display and the lower display shows the time and date of the successful operation.
The watch will adjust its time setting in accordance to with the information provided by the signal.
The watch will return to the Timekeeping Mode if you press A or if you do not perform any operation for about one or two minutes.
ERR will appear on the upper display if the receive operation is not successful. The watch will not adjust its time setting in this case. Press A to return to the Timekeeping Mode.

Note

To interrupt a receive operation and return to the Timekeeping Mode, press any button.

To check the latest signal reception results
In the Timekeeping Mode, press A to view the last successful receive time and date. Press A again to return to the previous screen.

Signal Reception Troubleshooting

Check the following points whenever you experience problems with signal reception.

Problem	Probable Cause	What you should do
I can’t receive a time calibration signal.

You performed some button operation during the auto receive operation.
The watch is not in the Timekeeping Mode or World Time Mode.
The watch is in a location where the signal cannot be received for some reason.
A countdown timer operation is in progress.
Radio interference is often present during the day time, which can interfere with calibration signal reception.

|

Perform manual signal receive at night or wait until the next auto signal receive operation is performed.
Enter the Timekeeping Mode or World Time Mode and try again.
Enter the Countdown Timer Mode and stop the countdown.
Check to make sure the watch is in a location where it can receive the signal.

Time setting is incorrect following signal reception.|

If the time is one hour off, the DST setting may be incorrect.
The Home City code setting is not correct for the area where you are using the watch.
The home position of the hands is off.

|

Change the DST setting to Auto DST.
Select the correct Home City code.
Enter the home position adjustment mode and adjust the home position.
For further information, see “Important!” under “Time Calibration Signal Reception” and “Radio-controlled Atomic Timekeeping Precautions”.

World Time

World Time shows the current time in 48 cities (29 time zones) around the world. A simple operation swaps your Home City with the currently selected World Time city.

The times kept in the World Time Mode are synchronized with the time being kept in the Timekeeping Mode. If you feel that there is an error in any World Time Mode time, check to make sure you have the correct city selected as your Home City. Also check to make sure that the current time as shown in the Timekeeping Mode is correct.
Select a city code in the World Time Mode to display the current time in any particular time zone around the globe. See the “City Code Table” for information about the UTC offset settings that are supported.
All of the operations in this section are performed in the World Time Mode, which you enter by pressing C.

To view the current time in another time zone
In the World Time Mode, use D to scroll through available city codes (time zone). Holding down the button scrolls at high speed.

When the city code (time zone) you want is selected, you can press A to display the date. After about one second, the watch will resume regular timekeeping.

To toggle a city code time between Standard Time and Daylight Saving Time

In the World Time Mode, press D to display the city code (time zone) whose Standard Time/Daylight Saving Time setting you want to change.
Hold down A for about three seconds to toggle between Daylight Saving Time (DST indicator displayed) and Standard Time (DST indicator not displayed).
• The DST indicator is shown on the World Time Mode screen while Daylight Saving Time is turned on.

Swapping your Home City and World Time City
You can use the procedure below to swap your Home City and World Time city. This changes your Home City to your World Time city, and your World Time city to your Home City. This capability can come in handy when you frequently travel between two cities in different time zones.

If your current World Time city supports receipt of a time calibration signal, making it your Home City enables calibration signal reception.
For information about which cities support time calibration signal reception, see “To specify your Home City”.

To swap your Home City and World Time city

In the World Time Mode, use D to select the World Time city you want.
Hold down A and B until the watch beeps.

This will make the World Time city (which you selected in step 1), your Home City. At the same time, it changes the Home City you had selected prior to step 2 your World Time city.
After swapping the Home City and World Time city, the watch stays in the World Time Mode with the city that was selected as the Home City prior to step 2 now displayed as the World Time city.

Stopwatch

The stopwatch lets you measure elapsed time, split times, and two finishes.

The digital display range of the stopwatch is 23 hours, 59 minutes, 59.99 seconds.
The stopwatch continues to run, restarting from zero after it reaches its limit, until you stop it.
The stopwatch hand will function as a 1/20-hand during the first second of an elapsed time operation. After that, it will function as a second hand until the first minute elapses. After that it will function as a minute hand. Whenever an elapsed time operation is stopped, the stopwatch hand will indicate the current seconds count.
The stopwatch measurement operation continues even if you exit the Stopwatch Mode.
Exiting the Stopwatch Mode while a split time is frozen on the display clears the split time and returns to elapsed time measurement.
All of the operations in this section are performed in the Stopwatch Mode, which you enter by pressing C.

To measure times with the stopwatch

Countdown Timer

You can set the countdown timer within a range of one minute to 60 minutes. An alarm sounds when the countdown reaches zero.

You also can select auto-repeat, which automatically restarts the countdown from the original value you set whenever zero is reached.
All of the operations in this section are performed in the Countdown Timer Mode, which you enter by pressing C.

To use the countdown timer
Press D while in the Countdown Timer Mode to start the countdown timer.

When the end of the countdown is reached and auto-repeat is turned off, the alarm sounds for 10 seconds or until you stop it by pressing any button. The countdown time is automatically reset to its starting value after the alarm stops.
When auto-repeat is turned on, the countdown will restart automatically without pausing when it reaches zero. The alarm sounds to signal when the countdown reaches zero. The countdown is repeated up to eight times, and then stop.
The number of the current repeat (1 to 8) is shown in the lower display.
The countdown timer measurement operation continues even if you exit the Countdown Timer Mode.
To stop a countdown timer operation completely, first pause it (by pressing D), and then press A. This returns the countdown time to its starting value.

To configure countdown start time and auto-repeat settings

While the countdown start time is on the display in the Countdown Timer Mode, hold down A for about three seconds until the minute setting of the countdown start time starts to flash, which indicates the setting screen.

• If the countdown start time is not displayed, use the procedure under “To use the countdown timer” to display it.

Press C to move the flashing in the sequence shown below, and select the setting you want to change.
Perform the following operations, depending on which setting is currently selected on the display.
• While the start time setting is flashing, use D (+) and B (–) to change it.
• While the auto-repeat on/off setting ( or ) is flashing on the display, press D to toggle auto-repeat on ( ) and off ( ).
Press A to exit the setting screen.
• The auto-repeat on indicator ( ) is displayed on the Countdown Timer Mode screen while this function is turned on.
• Frequent use of auto-repeat and the alarm can run down battery power.

Alarms

When an alarm is turned on, the alarm tone sounds when the alarm time is reached. One of the alarms is a snooze alarm, while the other four are one- time alarms.
You also can turn on an Hourly Time Signal that causes the watch to beep twice every hour on the hour.

There are five alarm screens numbered AL1, AL2, AL3 and AL4 for the one-time alarm, a snooze alarm screen indicated by SNZ. The Hourly Time Signal screen is indicated by SIG.
All of the operations in this section are performed in the Alarm Mode, which you enter by pressing C.

In the Alarm Mode, use D to scroll through the alarm screens until the one whose time you want to set is displayed.

• To set a one-time alarm, display an alarm screen AL1, AL2, AL3 and AL4. To set the snooze alarm, display the SNZ screen.
• SIG is the hourly time signal setting.
• The snooze alarm repeats every five minutes.

After you select an alarm, hold down A for about three seconds until the hour setting of the alarm time starts to flash, which indicates the setting screen.
• This operation turns on the alarm automatically.
Press C to move the flashing between the hour and minute settings.
While a setting is flashing, use D (+) and B (–) to change it.
Press A to exit the setting screen.

Alarm Operation
The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the watch is in. In the case of the snooze alarm, the alarm operation is performed a total of seven times, every five minutes, until you turn the alarm off.

Alarm and Hourly Time Signal operations are performed in accordance with the current time in your Home City, as kept in the Timekeeping Mode.
To stop the alarm tone after it starts to sound, press any button.
Performing any one of the following operations during a 5-minute interval between snooze alarms cancels the current snooze alarm operation.
Displaying the Timekeeping Mode setting screen
Displaying the SNZ setting screen

To turn an alarm on and off

In the Alarm Mode, use D to select an alarm.
Press A to toggle it on and off.
• Turning on a alarm (AL1, AL2, AL3, AL4orSNZ) displays the alarm on indicator on its Alarm Mode screen.
• In all modes, the alarm on indicator is shown for any alarm that is currently turned on.
• The alarm on indicator flashes while the alarm is sounding.
• The snooze alarm indicator flashes while the snooze alarm is sounding and during the 5-minute intervals between alarms.

To turn the Hourly Time Signal on and off

In the Alarm Mode, use D to select the Hourly Time Signal (SIG).
Press A to toggle it on and off.
• The Hourly Time Signal on indicator is shown on the display in all modes while this function is turned on.

Illumination

An LED (light-emitting diode) illuminates the face of the watch for easy reading in the dark. The watch’s auto light switch turns on illumination automatically when you angle the watch towards your face.

The auto light switch must be turned on (indicated by the auto light switch on indicator) for it to operate.
See “Illumination Precautions” for other important information about using illumination.

To illuminate the display manually
In any mode (except when a setting screen is on the display), press B to turn on the illumination for about one second.

The above operation turns on illumination regardless of the current auto light switch setting.

About the Auto Light Switch
Turning on the auto light switch causes illumination to turn on, whenever you position your wrist as described below in any mode.
Note that this watch features a “Full Auto LED Light”, so the auto light switch operates only when available light is below a certain level. It does not illuminate the display under bright light.

The auto light switch is always disabled, regardless of its on/off setting, when any one of the following conditions exists.
-While an alarm is sounding
-While a signal receive operation is in progress

Moving the watch to a position that is parallel to the ground and then tilting it towards you more than 40 degrees causes illumination to turn on.

Wear the watch on the outside of your wrist.

Warning!

Always make sure you are in a safe place whenever you are reading the display of the watch using the auto light switch. Be especially careful when running or engaged in any other activity that can result in accident or injury. Also take care that sudden illumination by the auto light switch does not startle or distract others around you.
When you are wearing the watch, make sure that its auto light switch is turned off before riding a bicycle or operating a motorcycle or any other motor vehicle. Sudden and unintended operation of the auto light switch can create a distraction, which can result in a traffic accident and serious personal injury.

To turn the auto light switch on and off
In the Timekeeping Mode, hold down B for about three seconds to toggle the auto light switch on (auto light switch on indicator displayed) and off (auto light switch on indicator not displayed).

The auto light switch on indicator is on the display in all modes while the auto light switch is turned on.

Power Supply

This watch is equipped with a solar cell and a special rechargeable battery (secondary battery) that is charged by the electrical power produced by the solar cell. The illustration shown below shows how you should position the watch for charging.

Example : Orient the watch so its face is pointing at a light source.

The illustration shows how to position a watch with a resin band.
Note that charging efficiency drops when any part of the solar cell is blocked by clothing, etc.
You should try to keep the watch outside of your sleeve as much as possible. Charging is reduced significantly if the face is covered only partially.

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. Be 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.
Never try to remove or replace the watch’s special 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 (C) and when you have the battery replaced.
Turn on the watch’s Power Saving function 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.

Battery Power Indicator and Power Recovery Mode indicator

The battery power indicator indicates you the current status of the rechargeable battery’s power.

Level	Battery Power Indicator	Function Status
1 (H)		All functions enabled.
2 (M)		All functions enabled.
3 (L)	(Charge Soon Alert)
Auto and manual receive, illumination, and beeper disabled.
4 (C)		Except for timekeeping, all functions and display indicators

disabled.
5 (C)| | All functions disabled.

The flashing LOW indicator at Level 3 (L) 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 (C), all functions are disabled and settings return to their initial factory defaults. Once the battery reaches Level 2 (M) after falling to Level 5 (C), reconfigure the current time, date, and other settings.
Display indicators reappear as soon as the battery is charged from Level 5 (C) to Level 2 (M).
The watch’s Home City code setting will change automatically to TYO (Tokyo) whenever the battery drops to Level 5 (C). 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 (C).
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 minutes.
Overuse of display illumination or the beeper can cause the R (Recover) indicator to appear in the upper display, which indicates that the watch is in the battery power recovery mode. Face illumination, the alarm, the countdown timer alarm, time signals, and all hand operations are disabled in the power recovery mode.
The watch continues to keep time internally, so normal timekeeping and function will resume as soon as battery power recovers to normal levels, which is indicated when the R indicator disappears.
If R (recover) appears frequently, it probably means that remaining battery power is low. Leave the watch in bright light for some time to allow it to charge.

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.

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 six 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)	Approximate Exposure Time
Outdoor Sunlight (50,000 lux)	8 minutes
Sunlight Through a Window (10,000 lux)	30 minutes
Daylight Through a Window on a Cloudy Day (5,000 lux)	48 minutes
Indoor Fluorescent Lighting (500 lux)	8 hours

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 exposure to light.

Recovery Times
The table below shows the amount exposure that is required to take the battery from one level to the next.

The above exposure time values are all for reference only. Actual required exposure times depend on lighting conditions.

Timekeeping

You can adjust the Home Time city data and time in the Timekeeping Mode manually.
You also can simultaneously display the current time in one other time zone, by specifying a Dual Time City.

For information about selecting a Dual Time City, see “To specify the Dual Time City”.
Pressing D in the Timekeeping Mode will cycle the lower display between the screens shown below.

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. When setting the time, it is important that you first select the correct city code for your Home City (the city where you normally use the watch). If your location is not included in the preset city codes, select the preset city code that is in the same time zone as your location.

Note that all of the times for the World Time city codes and Dual Time City are displayed in accordance with the time and date settings you configure for the Timekeeping Mode.

To set the time and date manually

In the Timekeeping Mode, hold down A for about five seconds until the left dial hand points to T1 and the city code flashes on the upper display. This is the setting screen.
Use 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”.
Press C to move the flashing in the sequence shown below to select the other setting.
When the timekeeping setting you want to change is flashing, use D or B to change it as described below.
Screen:| To do this:| Do this:
---|---|---
| Change the city code| Use D (east) and B (west).
| Cycle between Auto DST (AvtA), Daylight Saving Time (ON) and Standard Time ( ).| Press D.
| Toggle between 12-hour ( 12H) and 24-hour ( 24H ) timekeeping| Press D.
| Reset the seconds to 00| Press D.
| Change the hour and minutes| Use D (+) and B (–).
| Change the year, month, or day
| Toggle between Power Saving on ( ) and off ( )| Press D.
Press A twice to exit the setting screen.
• For details about the Daylight Saving Time setting, see “To change the Daylight Saving Time (summer time) setting”. For information about Power Saving, see “To turn Power Saving on and off”.
• Auto DST (AvtA) can be selected only while LIS, LON, MAD, PAR, ROM, BER, STO, ATH, MOW, TPE, SEL, TYO, HNL, ANC, YVR, LAX, YEA, DEN, MEX, CHI, MIA, YTO, NYC, YHZ, or YYT is selected as the Home City code. For more information, see “Daylight Saving Time (DST)” below.
• The day of the week is displayed automatically in accordance with the date (year, month, and day) settings.

12-hour and 24-hour timekeeping

With the 12-hour format, the P (PM) indicator appears to the left of the hour digits for times in the range of noon to 11:59 p.m. and no indicator appears to the left of the hour digits for times in the range of midnight to 11:59 a.m.
With the 24-hour format, times are displayed in the range of 0:00 to 23:59, without any indicator.
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is applied in all other modes.

Daylight Saving Time (DST)
Daylight Saving Time (summer time) advances the time setting by one hour from Standard Time. Remember that not all countries or even local areas use Daylight Saving Time.
The time calibration signals transmitted from Mainflingen (Germany), Anthorn (England), or Fort Collins (the United States) include both Standard Time and DST data. When the Auto DST setting is turned on, the watch switches between Standard Time and DST (summer time) automatically in accordance with the signals.

Though the time calibration signal transmitted by the Fukushima and Fukuoka/Saga, Japan transmitters include summer time data, summer time currently is not implemented in Japan (as of 2008).
The default DST setting is Auto DST (AvtA) whenever you select LIS, LON, MAD, PAR, ROM, BER, STO, ATH, MOW, TYO, ANC, YVR, LAX, YEA, DEN, MEX, CHI, MIA, YTO, NYC, YHZ,orYYT as your Home City code.
If you experience problems receiving the time calibration signal in your area, it probably is best to switch between Standard Time and Daylight Saving Time (summer time) manually.

To change the Daylight Saving Time (summer time) setting

In the Timekeeping Mode, hold down A for about five seconds until the left dial hand points to T1 and the city code flashes on the upper display. This is the setting screen.
Press C and the DST setting screen appears.
Use D to cycle through the DST settings in the sequence shown below.
When the setting you want is selected, press A twice to exit the setting screen.
• The DST indicator appears to indicate that Daylight Saving Time is turned on.

Dual Time
Dual Time lets you display the current time in another time zone called your “Dual Time City”, in addition your Home City’s current time. This feature is very handy for business professionals and others who need to keep track of the current time in two different time zones.

For information about how to display the current time in the Dual Time City in the lower display, see “Timekeeping”.

To specify the Dual Time City

In the Timekeeping Mode, hold down A for about five seconds until the left dial hand points to T1 and the city code flashes on the upper display.
Press A again. The left dial hand will move to T2 and the current Dual Time City code will start to flash on the upper display. This is the Dual Time City selection screen.
Use D (eastward) and B (westward) to scroll through the available city codes.
• See the “City Code Table” for information about city codes.
Press A to exit the setting screen.

Hand Home Position Correction

The hour and minute hands of the watch can be thrown off by exposure to strong magnetism or impact. The watch is designed to perform hour and minute hand correction automatically every hour in order to correct variation within the range of –55 minutes to +5 minutes.

You can trigger auto hour and minute hand position correction manually, if you want.
If the variation is greater than –55 minutes to +5 minutes, you can trigger auto hand position correction manually or perform correction of the hour and minute hand home positions manually.
If the dial hands are off, you will need to correct their home positions manually.

To trigger the auto hand home position correction manually

In the Timekeeping Mode, hold down D for about six seconds, until H-SET starts flashing on the upper display.

Note that H-SET will appear on the upper display about three seconds after you depress D, but you should not release the button until H-SET starts flashing. The flashing H-SET indicates that auto hour and minute hand home position correction has started.
Auto hour and minute hand home position correction takes about three and a half minutes to complete. Do not perform any other watch operation during that time.
The watch will return to the Timekeeping Mode automatically after auto correction is complete.
You will not be able to trigger auto correction while the watch is in the Countdown Timer Mode or while a countdown timer operation is in progress.
To interrupt an ongoing auto correction, press D. This will return to the Timekeeping Mode.

To adjust the home positions manually

In the Timekeeping Mode, hold down D for about three seconds, until H-SET appears on the upper display.
• The dial hands are in their correct home positions when the left dial hand moves to C (CHG) and the stopwatch hand moves to 60. If they don’t, use B to adjust the left dial hand position and D to adjust the stopwatch hand position.
After confirming that both dial hands are in their correct home positions, press C.
• This will change to hour hand and minute hand home position manual correction.
• The hour and minute hands are in their correct home positions if they are pointing to 12 o’clock. If they are not, use D (+) and B (–) to adjust their positions as required.
• Pressing C here will return to the setting at the beginning of step 2.
After everything is the way you want, press A to return to the Timekeeping Mode.
• After you complete the home position adjustment procedure, place the watch in a location that allows good time calibration signal reception, and then a manual receive operation. See “To perform manual receive” for more information.

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.

Power Saving Function

When turned on, the Power Saving function enters a sleep state automatically whenever the watch is left in an area for a certain period where it is dark. The table below shows how watch functions are affected by the Power Saving function.

Elapsed Time in Dark	Hands and Display	Operation
60 to 70 minutes	Left dial hand: PS; Stopwatch hand: “60”; Other hands:
Normal; Display: Blank	All functions enabled, except for displays
6 or 7 days	Left dial hand: PS; Other hands: Stopped at 12 o’clock;
Display: Blank	Auto receive, beeper tone, illumination, and display disabled.

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.
Angle the watch towards your face for reading.

To turn Power Saving on and off

In the Timekeeping Mode, hold down A for about five seconds until the left dial hand points to T1 and the city code flashes on the upper display. This is the setting screen.
Press C nine times until the Power Saving on/off screen appears.
Press D to toggle Power Saving on ( ) and off ( ).
Press A twice to exit the setting screen.

Radio-controlled Atomic Timekeeping Precautions

Strong electrostatic charge can cause the time setting to be thrown off.
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 cannot be performed starting from January 1, 2100.
This watch can receive signals that differentiate between leap years and non-leap years.
Though this watch is designed to receive both time data (hour, minutes, seconds) and date data (year, month, day), certain signal conditions can limit reception to time data only.
If you are in an area where proper time calibration signal reception is impossible, the watch keeps the time with the precision noted in “Specifications”.
If you have problems with proper time calibration signal reception or if the time setting is wrong after signal reception, check your current city code, DST (summer time).
The Home City setting reverts to the initial default of TYO (Tokyo) whenever the battery power drops to Level 5 (C) or when you have the rechargeable battery replaced. If this happens, change the Home City to the setting you want.

Transmitters

The time calibration signal received by this watch depends on the currently selected Home City code.

When a U.S. time zone is selected, the watch receives the time calibration signal transmitted from the United States (Fort Collins).
When a Japanese time zone is selected, the watch receives the time calibration signal transmitted from Japan (Fukushima and Fukuoka/Saga).
When a European time zone is selected, the watch receives the time calibration signals transmitted from Germany (Mainflingen) and England (Anthorn).
When a China time zone is selected, the watch receives the time calibration signals transmitted from China (Shangqiu City).
When your Home City is LIS, LON, MAD, PAR, ROM, BER, STO, ATH, MOW (which can receive both the Anthorn and Mainflingen signals), the watch first tries to pick up the signal it last successfully received. If that fails, it tries the other signal. For the first receive after you select your Home City, the watch tries the nearest signal first (Anthorn for LIS, LON, Mainflingen for MAD, PAR, ROM, BER, STO, ATH, and MOW).

Auto Return Features

If you leave the watch with a flashing setting on the display for two or three minutes without performing any operation, the watch automatically exits the setting screen.
The watch will return to the Timekeeping Mode automatically if you do not perform any operation for two or three minutes in the Alarm Mode.

High-Speed Movement

The D and B buttons are used to change the hand setting in various setting modes. In most cases, holding down these buttons will start high-speed movement of the applicable hand(s).

Initial Screens
When you enter the World Time Mode or Alarm Mode, the data you were viewing when you last exited the mode appears first.

Timekeeping

Resetting the seconds to 00 while the current count is in the range of 30 to 59 causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are reset to 00 without changing the minutes.
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 should be no reason to change it except when battery power drops to Level 5 (C).
The current time for all city codes in the Timekeeping Mode and World Time Mode is calculated in accordance with the Coordinated Universal Time (UTC) for each city, based on your Home City time setting.

Illumination Precautions

Illumination may be hard to see when viewed under direct sunlight.
Illumination turns off automatically whenever an alarm sounds.
Frequent use of illumination runs down the battery

Auto light switch precautions

The auto light switch is turned off automatically whenever battery power is at Level 4 (C).
Avoid wearing the watch on the inside of your wrist. Doing so causes the auto light switch to operate when it is not needed, which shortens battery life. If you want to wear the watch on the inside of your wrist, turn off the auto light switch feature.
More than 15 degrees too high
Illumination may not turn on if the face of the watch is more than 15 degrees above or below parallel. Make sure that the back of your hand is parallel to the ground.
Illumination turns off in about one second, even if you keep the watch pointed towards your face.
Static electricity or magnetic force can interfere with proper operation of the auto light switch. If illumination does not turn on, try moving the watch back to the starting position (parallel with the ground) and then tilt it back toward you again. If this does not work, drop your arm all the way down so it hangs at your side, and then bring it back up again.
Under certain conditions, illumination may not turn on until about one second after you turn the face of the watch towards you. This does not necessarily indicate malfunction of the auto light switch.
You may notice a very faint clicking sound coming from the watch when it is shaken back and forth. This sound is caused by mechanical operation of the auto light switch, and does not indicate a problem with the watch.

Specifications

Accuracy at normal temperature: ± 15 seconds a month (with no signal calibration) Digital Timekeeping: Hour, minutes, seconds, p.m. (P), month, day, day of the week Time format: 12-hour and 24-hour
Calendar system: Full Auto-calendar pre-programmed from the year 2000 to 2099 Other: Home City code (can be assigned one of 48 city codes); Standard Time / Daylight Saving Time (summer time); Simultaneous Home Time/Dual Time indication

Analog Timekeeping: Hour, minutes (hand moves every 10 seconds) Time Calibration Signal Reception: Auto receive 6 times a day (Remaining auto receives cancelled as soon as one is successful) (five times for the China signal); Manual receive Receivable Time Calibration Signals: Mainflingen, Germany (Call Sign: DCF77, Frequency: 77.5 kHz); Anthorn, England (Call Sign: MSF, Frequency: 60.0 kHz); Fort Collins, Colorado, the United States (Call Sign: WWVB, Frequency: 60.0 kHz); Fukushima, Japan (Call Sign: JJY, Frequency: 40.0 kHz); Fukuoka/Saga, Japan (Call Sign: JJY, Frequency: 60.0 kHz); Shangqiu City, Henan Province, China (Call Sign: BPC, Frequency: 68.5 kHz)

World Time: 48 cities (29 time zones) Other: Daylight Saving Time/Standard Time; Home City/World Time City Swapping Stopwatch: Measuring unit: 1/100 second Measuring capacity: 23:59′ 59.99” Measuring modes: Elapsed time, split time, two finishes Countdown Timer: Measuring unit: 1 second Input range: 1 minute to 60 minutes (1-minute increments) Other: Auto-repeat timing Alarms: Four one-time alarms; one snooze alarm; Hourly Time Signal Illumination: LED (light-emitting diode); Auto Light Switch Other: Power Saving; Auto hour and minute hand home position correction each hour

Power Supply: Solar cell and one rechargeable battery
Approximate battery operating time: 6 months (from full charge to Level 5 (C)) under the following conditions:

Watch not exposed to light
Internal timekeeping
Display on 18 hours per day, sleep state 6 hours per day
1 illumination operation (1.5 seconds) per day
10 seconds of alarm operation per day
4 minutes of signal reception per day

Frequent use of illumination runs down the battery. Particular care is required when using the auto light switch.

City Code Table

City Code	City	UTC Offset/ GMT Differential
PPG	Pago Pago	–11
HNL	Honolulu	–10
ANC	Anchorage	–9
YVR	Vancouver	–8
LAX	Los Angeles
YEA	Edmonton	–7
DEN	Denver
MEX	Mexico City	–6
CHI	Chicago
MIA	Miami	–5
YTO	Toronto
NYC	New York
SCL	Santiago	–4
YHZ	Halifax
YYT	St. Johns	–3.5
RIO	Rio De Janeiro	–3
RAI	Praia	–1
UTC		0
LIS	Lisbon
LON	London
MAD	Madrid	+1
PAR	Paris
ROM	Rome
BER	Berlin
STO	Stockholm
ATH	Athens	+2
CAI	Cairo
JRS	Jerusalem
MOW	Moscow	+3
JED	Jeddah
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
SIN	Singapore	+8
HKG	Hong Kong
BJS	Beijing
TPE	Taipei
SEL	Seoul	+9
TYO	Tokyo
ADL	Adelaide	+9.5
GUM	Guam	+10
SYD	Sydney
NOU	Noumea	+11
WLG	Wellington	+12

Based on data as of March 2008.
The rules governing global times (GMT differential and UTC offset) and summer time are determined by each individual country.