Casio 2637 User Manual
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MO0306-EA

Operation Guide 2607 2637 2687

Getting Acquainted

Congratulations upon your selection of this CASIO watch. To get the most out of your purchase, be sure to carefully read this manual and keep it on hand for later reference when necessary.

Expose the watch to bright light to charge its battery before using it.

You can use this watch even as its battery is being charged by exposure to bright light.

Be sure to read “Battery” of this manual for important information you need to know when exposing the watch to bright light.

If the display of the watch is blank...

If the sleep indicator (S/SLEEP) is on the display, it means that the display is blank because the watch’s

Sleep indicator

Power Saving function has shut it to conserve power.

 

 

Power Saving automatically turns off the display and

 

enters a sleep state whenever your watch is left in an area

 

where it is dark for a certain period.

 

The initial factory default setting is Power Saving on.

 

The watch recovers from the sleep state if you move it to

 

a well-litarea* , if you press any button, or if you angle

 

the watch towards your face for reading.

 

* It can take up to two seconds for the display to turn on.

 

See “Power Saving Function” for more information.

About This Manual

The operational procedures for Modules 2607, 2637 and 2687 are identical. All of the illustrations in this manual show Module 2607.

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.

(Light)

(Light)

(Light)

Module 2607

Module 2637

Module 2687

General Guide

Press Cto change from mode to mode.

In any mode, press L to illuminate the display.

World Time Mode

Timekeeping Mode

Press C.

Timekeeping

Use the Timekeeping Mode to set and view the current time and date.

The watch is equipped with a Time Recorder feature that lets you record the current Home City time (month, day, hour, minutes, seconds, and DST on/off setting) with the touch of a button. See “To record a Time Recorder time” for more information.

Pressing D displays the Last Signal screen (date and time that the time calibration signal was last received) in the Timekeeping Mode.

PM

Day of week

Receive time

indicator

 

 

 

Press D.

 

 

Month – Day

Receive date

 

Hour : Minutes Seconds

Last Signal Screen

 

 

Current Time Setting

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

Before using the watch in Western Europe, first use the procedure under “Setting Up the Watch for Use in Western Europe” to set the time in accordance with a time calibration signal.

Note that after you set your Home City (the city where you normally use the watch) code, you must also turn on the watch’s time calibration signal receiver if you want to enable auto time calibration. See “About Auto Receive” for more information.

See “Setting the Time and Date Manually” for information about manual settings.

Setting Up the Watch for Use in Western Europe

You need to make the following three settings before using this watch in Western Europe. The following provides a general overview of the setting procedure. For full details, see “Setting the Time and Date Manually” and “Time Calibration Signal Reception”.

Specify the city code for your Home City (the city where you will normally use the watch).

Select the auto Daylight Saving Time (summer time) setting.

Perform the manual time calibration signal receive operation to set the current time.

To set up the watch for use in Western Europe

City code

1. In the Timekeeping Mode, hold down Auntil the city

code starts to flash, which indicates the setting screen.

 

2.Use D(+) and B(–)to select the city code you want to use as your Home City.

The following are the city codes for major cities in the Western Europe time zones.

BER andPAR: Berlin, Paris, Milan, Rome, Amsterdam, Hamburg, Frankfurt, Vienna

LON: London

3.Press C and the Daylight Saving Time (summer time) setting screen appears.

4.Use Dto select AUTO (auto DST).

Auto DST specifies auto switching between Daylight Saving Time (DST) and Standard Time.

5.Press A twice to exit the setting screen.

6.Hold down D for about two seconds until the watch beeps.

Release Dand the message RC! appears to indicate that signal reception has started.

Time calibration signal reception takes from two to six

Receiving indicator minutes. Take care that you do not move the watch during this time.

Time Recorder Mode

Stopwatch Mode

Alarm Mode

 

 

When getting ready to receive the time calibration signal, position the watch as shown in the nearby illustration, and place it near a window in a location where there are no nearby metal objects.

Resin Band Metal Band

The watch should not be on its side or facing the wrong way.

See the information under “Time Calibration Signal Reception Precautions” if you experience problems with time calibration signal reception.

After signal reception is complete, the display of the watch changes to the Last Signal screen.

Time Calibration Signal Reception

This watch is designed to pick up a time calibration signal and update its time setting in accordance with the signal. There are two different methods you can use to receive the signal: Auto Receive andManual Receive. WithAuto Receive, the watch automatically receives the calibration signal four times each day and makes appropriate adjustments. WithManual Receive, you perform a specific button operation to receive the calibration signal.

This watch is able to receive the time calibration signal transmitted from Mainflingen, Germany (located 25 kilometers southeast of Frankfurt). Signal reception is possible within the area represented by a circle with a radius of about 1000 kilometers.

At distances further than about 500 kilometers, the signal may become weak and reception may be impossible under certain conditions.

Signal reception may be poor in the shaded area on the map, even though it is within 1,000 kilometers of the signal transmitter.

Frankfurt

Note

If you are using the time calibration signal to set the time for this watch, be sure to correctly set your Home City. Otherwise, there is the chance that the watch will not set the correct time. See “Setting the Time and Date Manually” for details.

Note that signal reception is possible only when the watch is within range of a time calibration signal transmitter, and BER,PAR,LON, orATH is selected as the Home City code.

See “City Code Table” for a complete list of available city codes.

The current time setting in accordance with the time calibration signal takes priority over any time settings you make.

Auto receive is turned on when the watch is shipped from the factory.

See the information under “Time Calibration Signal Reception Precautions” if you experience problems with time calibration signal reception.

1

DST indicator
Module 2607
Module 2637
DST indicator
Module 2687
Receiving indicator

Operation Guide 2607 2637 2687

To perform manual time calibration signal reception

1. Place the watch on a stable surface so its top (12 o'clock side) is facing towards a window.

2. In the Timekeeping Mode, hold down Dfor about two seconds until the watch beeps.

Release D and the messageRC! appears to indicate

that signal reception has started.

Time calibration signal reception takes from two to six minutes. Take care that you do not move the watch during this time.

After signal reception is complete, the display of the watch changes to the Last Signal screen.

The Level 4 receiving indicator indicates that the time calibration reception attempt was successful.

Note

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

If the receive operation is unsuccessful, the message ERR appears on the display for about one or two minutes. After that, the watch returns to the Timekeeping Mode.

You can also change from the Last Signal or ERR screen to the normal timekeeping screen by pressing D.

About the Receiving Indicator

The receiving indicator shows the strength of the calibration signal being received. For best reception, be sure to keep the watch in a location where signal strength is strongest.

Modules 2607, 2637, and 2687

Module 2607

 

Module 2637

 

Weak

Strong

(Level 1)

(Level 4)

Even in an area where signal strength is strong, it takes about 10 seconds for signal reception to stabilize enough for the receiving indicator to indicate signal strength.

Use the receiving indicator as a guide for checking signal strength and for finding the best location for the watch during signal receive operations.

Following reception of the time calibration signal and calibration of the watch’s time setting, the Level 4 receiving indicator will remain on the display in all modes. The Level 4 receiving indicator will not be displayed if signal reception was unsuccessful or after you adjust the current time setting manually.

About Auto Receive

When auto receive is turned on, the watch automatically starts to receive the time calibration signal when the time in the Timekeeping Mode reaches 2:00 AM, 3:00 AM, 4:00 AM, and 5:00 AM each day (calibration times).

Note

The auto receive operation is performed only if the watch is in the Timekeeping or World Time Mode when one of the calibration times is reached.

It is not performed if a calibration time is reached while you are making settings (while settings are flashing on the display) or while an alarm is sounding.

Auto receipt 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 easily receive the signal.

The Level 4 receiving indicator indicates that either the 2:00 AM, 3:00 AM, 4:00 AM or 5:00 AM calibration signal reception was successful. Note, however, that the Level 4 receiving indicator is cleared from the display at 3:00 AM each day.

If you do not see the Level 4 receiving indicator except for the above reason, it means there was some problem with the calibration reception operation. Either perform reception manually, or make sure the watch is set up properly to receive the time calibration signal for the next automatic reception time.

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.

The Level 4 receiving indicator is displayed only when the watch is able to successfully receive both time and date data. It does not appear when only time data is received.

Normally, the signal reception date shown by the Last Signal screen is the date data included in the received time calibration signal. When only time data is received, however, the Last Signal screen shows the date as kept in the Timekeeping Mode at the time of signal reception.

When auto receive is turned on, the watch receives the calibration signal for two to six minutes each day when the Timekeeping Mode time reaches 2:00 AM, 3:00 AM, 4:00 AM, and 5:00 AM. Do not operate any of the watch’s buttons within six minutes prior to or following the calibration times. Doing so can interfere with correct calibration.

Remember that reception of the calibration signal depends on the time kept in the Timekeeping Mode. The receive operation will be performed whenever the display shows 2:00 AM, 3:00 AM, 4:00 AM, and 5:00 AM, regardless of whether or not the Timekeeping Mode time is actually the correct time.

When two, three, or four receptions are successful, the watch uses the data of the last reception for calibration. When only one reception is successful, the watch uses the data of the successful reception.

To turn auto receive on and off

1. In the Timekeeping Mode, hold down Auntil the city code starts to flash, which indicates the setting screen.

2. Press C twice to move the flashing to the auto receive on/off setting.

3. Press Dto toggle auto receive on (ON) and off (OFF).

If the current Home City setting is a city code that

does not support signal receive, “xx” appears in place of the on/off indicator. This means you cannot turn auto receive on or off.

4. Press Atwice to exit the setting screen.

For information about city codes that support signal receive, see “To set up the watch for use in Western Europe”.

Setting the Time and Date Manually

Make sure you select your Home City code (the city code whose time and date you are setting) before change the current time and date settings. World Time Mode times are all displayed in accordance with the Timekeeping Mode settings. Because of this, World Time Mode times will not be correct if you do not select the proper Home City code before setting the time and date in the Timekeeping Mode.

To set the current time and date manually

City code 1. In the Timekeeping Mode, hold down A until the city

code starts to flash, which indicates the setting screen.

2. Press Aor Cto move the flashing in the sequence shown below to select other settings.

 

Press C.

/ Press A.

 

 

C

 

Auto

 

City Code

DST

 

Receive

 

 

 

 

 

A

 

 

 

 

12/24-Hour

C

 

Hour

Minutes

Format

Seconds

 

 

 

 

Power Saving

Day

 

Month

Year

on/off

 

 

 

 

 

3.When the setting you want to change is flashing, use B and/or Dto change it as described below.

Setting

Screen

Button Operations

City code

 

Use D (+) and B (–)to change the

 

 

setting.

DST

 

Press Dto toggle between Daylight Saving

 

 

Time (ON) and Standard Time (OFF).

 

 

Pressing Dperforms a different

 

 

operation when BER,PAR,LON orATH

 

 

is selected as Home City Code. See “Auto

 

 

DST (Summer Time) Switching”.

Auto Receive

 

Press Dto toggle auto receive on and off.

12/24-Hourformat

 

Press Dto toggle between 12-hour(12H)

 

 

and 24-hour(24H) timekeeping.

Hour, Minutes

 

Use D(+) and B(–)to change the

 

 

setting.

Seconds

 

Press Dto reset the seconds to 00.

Year

 

Use D(+) and B(–)to change the

Month, Day

 

setting.

 

 

Power Saving on/off

 

Press Dto toggle the Power Saving on

 

 

(ON) and off (OFF).

4. Press Ato exit the setting screen.

The auto receive setting is used for time calibration signal reception only. See “About Auto Receive” for details.

See “City Code Table” for a complete list of available city codes.

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 to00 without changing the minutes.

World Time

City code

Home city time

Current time in the selected city code

World Time shows the current time in 30 cities (29 time zones) around the world.

For full information on city codes, see the “City Code Table”.

The current time for all city codes in the World Time Mode is calculated in accordance with the Greenwich Mean Time (GMT) differential for each city, based on the your Home City time setting.

All of the operations in this section are performed in the World Time Mode, which you enter by pressing C.

To view the time in another city code

While in the World Time Mode, press Dto scroll through the city codes (time zones) to the east or B to scroll to the west.

If the current time shown for a city is wrong, check your Timekeeping Mode time and Home City settings and make the necessary changes.

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

1. In the World Time Mode, use Band D to display the city code (time zone) whose Standard Time/Daylight Saving Time setting you want to change.

2. Hold down Ato toggle Daylight Saving Time (DST

indicator displayed) and Standard Time (DST indicator

not displayed).

The DST indicator is on the display whenever you

display a city code for which Daylight Saving Time is

turned on.

Note that the DST/Standard Time setting affects only the currently displayed city code. Other city codes are not affected.

Daylight Saving Time (DST) advances the time setting

by one hour from Standard Time. Remember that the

not all countries or even local areas use Daylight Saving

Time.

The watch will perform a signal receive operation even if it is in the World Time Mode when a calibration time is reached. If this happens, the World Time Mode time settings will be adjusted in accordance with the Home City time.

2

Alarm on indicator
Module 2607
Snooze on indicator
Module 2637
Alarm on indicator
Module 2687

Operation Guide 2607 2637 2687

Time Recorder

Time record number

Recorded date (Mouth – Day)

Recorded time

(Hour : Minutes Seconds)

The Time Recorder lets you store up to 30 records of the current time (month, day, hour, minutes, seconds, and DST on/off setting) with the touch of a button. One way you can use the Time Recorder is to record the start time and the end time of a particular event.

To record a Time Recorder time

In the Timekeeping Mode, hold down B to record the Home City time (month, day, hour, minutes, seconds, and DST on/off setting).

The recorded time flashes for about two seconds, and then it is assigned a record number. After that, the Timekeeping Mode screen appears.

Records are assigned numbers sequentially from #01 through#30.

Storing a new time record when there are already 30 records stored in memory automatically deletes record #01, shifts the remaining records upwards by 1, and stores the new record as#30.

To recall Time Recorder times

In the Time Recorder Mode, use D (+) and B (–)to scroll through times stored in memory.

If you recorded a new Time Recorder time since you last entered the Time Recorder Mode, the newest record appears first. If you have not recorded a new time, the record you were viewing when you last exited the Time Recorder Mode appears first.

To delete all Time Recorder times

In the Time Recorder Mode, hold down A to delete all Time Recorder times.

Alarms

Alarm number

Home city time Alarm time (Hour : Minutes)

To set an alarm time

Alarm Operation

The Alarm Mode gives you a choice of four one-timealarms and one snooze alarm.

Also use the Alarm Mode to turn the Hourly Time Signal (SIG) on and off.

There are five alarms numbered AL1 throughAL4, andSNZ. You can configureSNZ as a snooze alarm only. AlarmsAL1 throughAL4 can be used as onetime alarms only.

Alarm settings (and Hourly Time Signal settings) are

available in the Alarm Mode, which you enter by pressing C.

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

AL1 AL2AL3

SIG SNZAL4

2.After you select an alarm, hold down A until the hour setting of the alarm time starts to flash, which indicates

the setting screen.

This operation automatically turns on the alarm.

3.Use Cto move the flashing between the hour and minute settings.

4.While a setting is flashing, use D (+) and B(–)to change it.

5.Press Ato exit the setting screen.

When setting the alarm time using the 12-hourformat, take care to set the time correctly as a.m. (A indicator) or p.m. (P indicator).

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, or until you turn the alarm off.

Pressing any button stops the alarm tone operation.

Performing any one of the following operations during a 5-minuteinterval between snooze alarms cancels the current snooze alarm operation.

Displaying the Timekeeping Mode setting screen Displaying the snooze alarm setting screen

To test the alarm

In the Alarm Mode, hold down Bto sound the alarm.

To turn an alarm on and off

1. In the Alarm Mode, use Dto select an alarm. 2. Press Bto toggle it on and off.

Turning on aone-timealarm (AL1,AL2,AL3,

AL4) displays the alarm on indicator on its Alarm

Mode screen. Turning on the snooze alarm (SNZ)

displays the alarm on indicator and snooze alarm

indicator on its Alarm Mode screen.

In all modes, the alarm on indicator is shown for any alarm that is currently turned on. When the snooze

alarm is on, the snooze alarm indicator is displayed in all

modes.

The alarm on indicator flashes while the alarm is sounding.

The snooze alarm indicator flashes during the5-minuteintervals between alarms.

To turn the Hourly Time Signal on and off

1. In the Alarm Mode, use Dto select the Hourly Time Signal (SIG).

2. Press Bto toggle it on (Hourly Time Signal on

 

indicator displayed) and off (Hourly Time Signal on

 

indicator not displayed).

Module 2607

The Hourly Time Signal on indicator is displayed in all

modes when the Hourly Time Signal is turned on.

Hourly time signal

 

on indicator

 

Module 2637

 

Module 2687

Stopwatch

 

 

Hours

Minutes

 

 

Seconds

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Home city time 1/100 second

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

The 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.

Exiting the Stopwatch Mode while a split time is frozen on the display clears the split time and returns to elapsed time measurement.

The stopwatch measurement operation continues even if you exit the Stopwatch Mode.

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

 

 

Elapsed Time

 

 

 

 

D

D

D

D

B

Start

Stop

Re-start

Stop

Clear

Split Time

 

 

 

 

D

B

B

D

B

Start

Split

Split release

Stop

Clear

 

(SPL/ SPLdisplayed)

 

 

Two Finishes

 

 

 

 

D

B

D

B

B

Start

Split

Stop

Split release

Clear

 

First runner

Second runner

Display time of

 

 

finishes.

finishes.

second runner.

 

 

Display time of

 

 

 

 

first runner.

 

 

 

Backlight

Auto light switch on indicator

Module 2607

Module 2637

The backlight uses an EL (electro-luminescent)panel that causes the entire display to glow for easy reading in the dark. The watch’s auto light switch automatically turns on the backlight when you angle the watch towards your face in the dark.

The auto light switch must be turned on (indicated by the auto light switch on indicator) for it to operate.

See “Backlight Precautions” for other important information about using the backlight.

To turn on the backlight manually

In any mode, press Lto illuminate the display for about one second.

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

Module 2687

About the Auto Light Switch

Turning on the auto light switch causes the backlight to turn on for about one second, whenever you position your wrist as described below in any mode. Note that this watch features a “Full Auto EL Light,” so the auto light switch operates only when available light is below a certain level. It does not turn on the backlight under bright light.

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

Parallel to

 

ground

More than

 

40°

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 surprise or distract others around you.

When you are wearing the watch, make sure that its auto light switch is turned off before riding on 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.

3

Operation Guide 2607 2637 2687

To turn the auto light switch on and off

In any mode, hold down Lfor about two seconds to toggle the auto light switch on (auto light switch on indicator displayed) or 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.

Battery

This watch is equipped with a solar cell and a 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

Solar cell

is pointing at a light source.

 

Note that charging efficiency drops

 

when any part of the solar cell is

 

blocked by clothing, etc.

 

The illustration shows how to position

 

a watch with a resin band.

 

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 normally exposed to bright light whenever possible.

This watch employs a solar cell that converts light into electricity that charges a builtin rechargeable battery. Normally, the rechargeable battery should not need replacement, but after very long use over a number of years, the rechargeable 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-specifiedCTL1616 battery only. Other rechargeable batteries can cause damage to 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 4 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

The battery power indicator on the display shows you the current status of the rechargeable battery’s power.

 

Level

Battery Power Indicator

Function Status

Battery power

1

Module 2607

2637

2687

All functions enabled.

indicator

 

 

 

 

 

 

2

 

 

 

All functions enabled.

 

3

 

 

 

Beeper tone, backlight,

 

 

 

 

 

calibration signal

 

 

 

 

 

reception, display, and

 

 

Charge Soon Alert

 

buttons are disabled.

Recover

 

 

 

indicator

4

 

 

 

All functions, including

 

 

 

 

 

 

 

 

 

timekeeping, are

 

 

 

 

 

disabled.

The Level 3 charge warning indicator tells you that battery power is very low, and that exposure to bright light for charging is required as soon as possible.

At Level 4, all functions are disabled and settings return to their initial factory defaults. Functions are enabled once again after the rechargeable battery is charged, but you need to set the time and date after the battery reaches Level 3 from Level 4. You will not be able to configure any of the other settings until the battery reaches Level 2 after dropping to Level 4.

Leaving the watch in direct sunlight or some other very strong light source can cause the battery power indicator to temporarily show a reading that is actually higher than the battery level. The correct battery power indicator should appear after a few minutes.

If you use the backlight or the alarms a number of times during a short period, the

recover indicator (R /RECOVER) appears on the display and the following operations become disabled until battery power recovers.

Backlight Beeper tone

Calibration reception

After some time, battery power will recover and the recover indicator (R/ RECOVER ) will disappear, indicating that the above functions are enabled again.

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, while the watch is used under the conditions described below.

Operating Conditions

Watch is not exposed to light

Display on 18 hours per day, sleep state 6 hours per day

1 backlight operation (1.5 seconds) per day

10 seconds of alarm operation per day

4 times calibration reception per day

Charge Times

Exposing the watch to light for the periods shown below each day restores the power used by the above operating conditions.

Exposure Level (Brightness)

Approximate

 

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

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 4

 

Level 3

Level 2

 

Level 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outdoor Sunlight

1 hour

 

 

 

14 hours

 

3 hours

(50,000 lux)

 

 

 

 

 

 

 

 

 

 

Sunlight Through a

3 hours

 

 

 

70 hours

 

14 hours

Window (10,000 lux)

 

 

 

 

 

 

 

 

 

 

Daylight Through a

5 hours

 

 

 

143 hours

 

28 hours

Window on a Cloudy

 

 

 

 

 

 

 

 

 

 

Day (5,000 lux)

 

 

 

 

 

 

 

 

 

 

Indoor Fluorescent

57 hours

 

 

 

------------

 

 

------------

 

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 leave the watch in the Time Recorder Mode or Alarm Mode for two or three minutes without performing any operation, it automatically returns to the Timekeeping Mode.

If you leave a screen with flashing digits on the display for two or three minutes without performing any operation, the watch automatically saves anything you have input up to that point and exits the setting screen.

Data and Setting Scrolling

The Band Dbuttons are used in various modes and setting screens to scroll through data on the display. In most cases, holding down these buttons during a scroll operation scrolls through the data at high speed.

Initial Screens

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

Time Calibration Signal Reception Precautions

Reception is best when the antenna built into the 12 o'clock edge of the watch is facing in the general direction of the signal transmitter. Note, however, that moving the watch while the time calibration signal receive operation is taking place will make stable reception impossible.

Proper signal reception can be difficult or even impossible under the conditions listed below.

Inside or

Inside a

Near

Near a

Near high-

Among or

among

vehicle

household

construction

tension

behind

buildings

 

appliances or

site, airport, or

power lines

mountains

 

 

office

other sources

 

 

 

 

equipment

of electrical

 

 

 

 

 

noise

 

 

Radio interference can make signal reception impossible.

Strong electrostatic charge can result in the wrong time being set.

Even when the watch is within the reception range of the transmitter, signal reception is 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.

The time calibration signal is bounced 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.

The watch is designed to automatically update the date and day of the week 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-leapyears.

If you are in an area where proper time calibration signal reception is impossible, the watch keeps time within ±15 seconds a month at normal temperature.

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