Casio 2645 User Manual
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MA0310-EA

Operation Guide 2514/2645

Power Saving

The Power Saving feature of the watch is turned on at the factory.

Power Saving causes the watch to automatically enter a sleep state to save power whenever the watch is left in the dark.

Note that the watch may also enter the sleep state if the watch is blocked from light by your sleeve.

How the sleep state works

Display sleep state

The display sleep state is triggered whenever the watch is left in the dark for three or four days.

The display goes blank, except for a sleep indicator. Alarms, the hourly time signal, and auto signal reception continue to operate normally while the watch is in the display sleep state.

Function sleep state

To recover from the sleep state

Move the watch to a brightly lit location or press any button.

It may take as long as five seconds to recover from the sleep state

To turn Power Saving on and off

See the procedure under “To manually set the time and date” for information about turning off Power Saving.

Leaving the watch in a drawer or anywhere else it is dark can cause Power Saving to trigger in order to conserve battery power.

The function sleep state is triggered whenever the watch is left in the dark for four days.

Alarms, the hourly time signal,

Sleep indicator

and auto signal reception do

 

not operate while the watch is

 

in the function sleep state.

 

Digital timekeeping functions continue to operate normally in the function sleep state.

Modes and Display Screens

The actual appearance of your watch display depends on its model number.

 

 

Each press of the C button sounds a confirmation tone and cycles through available modes in the sequence shown below.

The watch will automatically revert to the Timekeeping Mode if you leave it in the Alarm Mode or Data Memory Mode without performing any operation for about two or three minutes.

Display Illumination

Pressing the L button in any mode illuminates the display for about 1.5 seconds for easy reading in the dark.

Timekeeping Mode

(RECOVER indicator)

(Light)

Button

 

 

Button

 

 

 

 

 

 

(Sleep indicator)

Button

 

 

 

Button

 

 

Button

(Mode Switching)

 

 

 

 

 

(Alarm Indicator)

Battery Indicator

Day of the Week

Month - day

 

 

Receive Icon

 

 

 

PM indicator

 

 

 

(no display for AM)

 

 

Receive Indicator

 

 

 

Hour : Minutes

 

Seconds

Days of the Week

 

 

 

SUN : Sunday

MON : Monday

TUE : Tuesday

WED : Wednesday

THU : Thursday

FRI : Friday

SAT : Saturday

 

 

 

World Time Mode

GMT Differential

City Code

World Time

Stopwatch Mode

Mode Name

Time

Alarm Mode

Alarm Number

Message text appears when text is present.

Alarm Time

Data Memory Mode

Data

Record Number

Important!

The light may be difficult to see if you turn it on under bright sunlight.

The light is shut off automatically if the alarm starts to sound while it is on.

You may notice a slight sound from the watch while the display is illuminated. This is the sound of EL panel vibration, and does not indicate malfunction.

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Operation Guide 2514/2645

Power Supply

The power supply of this watch uses a solar cell to generate electrical power, which is stored by a rechargeable battery. Using or storing the watch where it is not regularly exposed to light, or allowing it to be blocked from light by your sleeve as you are wearing it can cause the power of the rechargeable battery to run down. To ensure stable operation, be sure to allow the watch to be exposed to light as much as possible when you are wearing or storing it.

Important!

Note that all data in memory and all settings are cleared whenever you allow the level of the rechargeable battery to drop to Level 4.

Battery Indicator

Level 1

Normal operation enabled.

Level 2

Normal operation enabled.

Signal reception, tones (alarms, hourly Level 3 time signal) display illumination, digital

display, and button operations disabled.

Level 4

All functions, including digital

timekeeping, disabled.

 

Exposing the watch to direct sunlight or other strong light may cause the battery level indicator to momentarily indicate a level that is higher than the actual battery level. Because of this, you should wait for a short while after charging to check the battery level indicator.

Even after the battery drops to Level 4, watch operation will resume as soon as charging starts. However, you should wait until the battery reaches Level 2 before setting the time and date.

Start charging at Level 3!

If the Level 3 indicator starts to flash, it means that battery power is very low. Be sure to expose the watch to light for recharging as soon as possible after the Level 3 indicator starts to flash.

RECOVER Indicator

If you use the light or alarms a number of times during a short period, the RECOVER indicator may appear on the display to indicate that the following operations are disabled in order to allow battery power to recover.

RECOVER indicator

Display illumination

Alarm and hourly time signal

Time calibration signal reception

Normal operation will return after the battery recovers.

Charging Precautions

Avoid charging the watch in the following locations, and anywhere else the watch may become very hot.

On the dashboard of an automobile parked in the sun

Very close to an incandescent light source or other sources of heat

In a location exposed to direct sunlight for long periods

Note that the display panel may become black under very high temperatures. This is temporary, and the display will appear normal again at lower temperatures.

Depending on the light source you are using, the case of the watch may become quite hot during charging. Take care to guard against burn injury after charging.

To charge the battery

Point the solar panel (face) of the watch at a light source.

Remember that even a partial blockage of the solar cell reduced charging efficiency.

Example: Positioning the watch

Solar Cell

The illustration shows the resin band mode.

Charging Guide

Starting from a full charge, it should take approximately six months of operation without further charging under the conditions described below before battery drops to Level 3.

Daily Use (All time values are approximate.)

Display Illumination: 1.5 seconds

Alarms: 10 seconds

Signal reception: 3 times

Making sure the watch is regularly exposed to light ensure stable operation.

Required Daily Charging Time

The following is the daily amount of charging required each day to support the operations under “Daily Use”.

Exposure Level

Approximate

Charging

(Brightness)

Time

 

Outdoor Sunlight

5 min.

(50,000 lux)

 

 

 

Sunlight Through a

24 min.

Window (10,000 lux)

 

Daylight Through a

Window on a Cloudy Day 48 min. (5,000 lux)

Indoor Fluorescent

8 hr.

Lighting (500 lux)

 

Charge Times Required to Advance to a Higher Level

Exposure Level

Approximate Charging Time

(Brightness)

Level 4 \ Level 3

\ Level 2

\ Level 1

Outdoor Sunlight

52 min.

15 hr.

2 hr.

(50,000 lux)

 

 

 

 

 

 

 

Sunlight Through a

2 hr.

67 hr.

13 hr.

Window (10,000 lux)

 

 

 

 

 

 

 

Daylight Through a

 

 

 

Window on a Cloudy

4 hr.

– – –

– – –

Day (5,000 lux)

 

 

 

Indoor Fluorescent

37 hr.

– – –

– – –

Lighting (500 lux)

 

 

 

 

 

 

 

Note that the above charging times are for reference only. Actual charging time depends on a variety of environmental factors.

World Time Mode

World time lets you display the current time in any one of 30 cities (29 time zones) around the world.

When you enter the World Time Mode, the screen for the city that was displayed when you last exited the mode appears first.

The seconds count in the World Time Mode is linked with the Timekeeping Mode seconds count.

Selecting 24-hourtimekeeping for the Timekeeping Mode automatically switches the World Time mode to24-hourtimekeeping.

Important!

If the World Time Mode time is incorrect, correct the setting of the current time in the Timekeeping Mode.

See “To manually set the time and date” for more information.

To search for a city

In the World Time Mode, use the D (+) and A (–)buttons to scroll through city codes.

Holding down either button scrolls city codes at high speed.

City Code

GMT Differential

(Back)

(Forward)

World Time

Using Summer Time (DST)

Summer time, or Daylight Saving Time (DST) as is it is called in some countries, calls for setting clocks ahead one hour during the summer season. Note that the use of summer time depends on the country and even the local area.

To turn summer time on and off

1. In the World Time Mode, use the D and A buttons to select the city whose summer time setting you want to change.

DST indicator

2. Press the B button to toggle auto reception ON and OFF.

The “DST” indicator appears on the display and timekeeping is advanced by one hour when summer time is turned on.

You can turn summer time on or off independently for each World Time Mode city. Note, however, that you cannot change the summer time setting for the “GMT” (Greenwich Mean Time) zone.

City Code List

City

GMT

City Name

City

GMT

City Name

Code

Differential

Code

Differential

 

 

 

 

 

 

 

 

– – –

–11

 

JRS

+2

Jerusalem

 

 

 

 

 

 

HNL

–10

Honolulu

JED

+3

Jeddah

 

 

 

 

 

 

ANC

–9

Anchorage

THR

+3.5

Teheran

 

 

 

 

 

 

LAX

–8

Los Angeles

DXB

+4

Dubai

DEN

–7

Denver

KBL

+4.5

Kabul

 

 

 

 

 

 

CHI

–6

Chicago

KHI

+5

Karachi

 

 

 

 

 

 

NYC

–5

New York

DEL

+5.5

Delhi

CCS

–4

Caracas

DAC

+6

Dakar

 

 

 

 

 

 

RIO

–3

Rio de Janeiro

RGN

+6.5

Yangon

– – –

–2

 

BKK

+7

Bangkok

– – –

–1

 

HKG

+8

Hong Kong

 

 

 

 

 

 

GMT

+0

Greenwich Mean Time

SEL

+9

Seoul

LON

+0

London

TYO

+9

Tokyo

PAR

+1

Paris

ADL

+9.5

Adelaide

 

 

 

 

 

 

BER

+1

Berlin

SYD

+10

Sydney

 

 

 

 

 

 

ATH

+2

Athens

NOU

+11

Noumea

CAI

+2

Cairo

WLG

+12

Wellington

 

 

 

 

 

 

The contents of the above table are current as of June 2002.

Time differentials in the above table are in accordance with Universal Time Coordinated (UTC).

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Operation Guide 2514/2645

How a Radio-controlledWatch Works

What is a radio-controlledwatch?

Your radio-controlledwatch is designed to receive a time calibration signal that contains standard time data and adjust its current time setting accordingly.

 

 

 

Signal is received using

Transmitter

Long-wavetime

built-inantenna.

 

 

calibration signal

Watch decodes

 

 

 

 

 

 

received data and

 

 

 

converts it to time

 

 

Signal data

data.

 

 

Decode

Cesium

 

Time data

Time is adjusted

 

 

according to time

atomic clock

Watch

Internally

data.

 

 

 

After the watch receives the Standard Time signal, it performs internal calculations to determine the current time. Because of this, there may be an error of up to one second in the displayed time.

Calibration Signal

The Japanese calibration signal (Call Sign: JJY) is maintained by the independent Japan Ministry of Posts and Telecommunications Communication Research Laboratory (CRL). It is a long wave signal transmitted 24 hours a day from the Mt. Otakadoya transmitter (40kHz) located in Tamura-gun,Fukushima Prefecture, and from the Mt. Hagane transmitter (60kHz) located on the border between Saga Prefecture and Fukuoka Prefecture.

The U.S. calibration signal (Call Sign: WWVB) is transmitted by the National Institute of Standards and technology from Fort Collins, Colorado.

Though the calibration signal is normally transmitted 24 hours a day, transmission may be interrupted occasionally due to maintenance, lightening, etc.

Reception Range

This watch is designed to receive the standard time calibration signal of Japan (JJY) or of the United States (WWVB). The signal that is received depends on the current Home City setting.

For information about selecting a Home City, see “To manually set the time and date”.

Home City

Transmitter

 

 

TYO

Either the Mt. Otakadoya signal (40kHz) or the Mt.Hagane signal (60kHz)

 

 

LAX, DEN, CHI, NYC

Fort Collins, Colorado signal

 

 

Transmitter Location

1000km

500km

Mt. Otakadoya

(40kHz)

500km

Mt. Hagane

(60kHz)

1000km

Under optimum conditions, the calibration signal should be receivable up to 1,000 kilometers from the transmitter.

Note that the wave is relatively weak at distances greater than 500km, so reception may be poor at long distances.

Transmitter Location

3000km

1000km

Fort Collins

Under optimum conditions, the calibration signal should be receivable up to 3,000 kilometers from the transmitter.

Note that the wave is relatively weak at distances greater than 1,000km, so reception may be poor at long distances.

Geographic contours, nearby buildings, the season, the time of day, can even make reception impossible even when you are within range of the transmitter.

Best reception is possible late at night.

Location

Reception is difficult and may even be impossible in the locations described below. Avoid such locations when performing signal reception.

You should think of your watch operating like a radio or TV when it is receiving the calibration signal.

Among or near buildings

Near high-voltagelines

Inside a vehicle

(automobile, train, plane, etc.)

In a location where there is radio interference

(construction site, airport, etc.)

Next to a household appliance or office equipment (TV, speaker, fax, PC, mobile phone, etc.)

Near mountains

If you are experiencing problems with reception, move away from the types of locations described above to a location with better reception, and try again.

Receiving the Calibration Signal

There are two methods you can use to receive the time calibration signal.

Auto reception (Reception is performed automatically at 2:00, 4:00, and 6:00 each morning.)

Manual receive (You initiate reception using a button operation.)

The watch is set up for auto reception at the factory, so all you need to do is to place it in a location that allows good reception each night.

To make reception easier

Remove the watch from your wrist and place it somewhere so its top (12 o’clock side, where the antenna is located) is facing approximately in the direction of the signal transmitter. Keep it away from metal objects.

Resin band

Metal band

Orienting the watch so it is sideways to the transmitter makes it more difficult to receive the signal.

Do not move the watch while it is receiving the calibration signal.

Time Required for Reception

Signal reception takes anywhere from about two to six minutes.

Note that when “FREQ. AT” is specified as the frequency selection mode, signal reception can take up to 12 minutes.

See “Specifying the Transmitter Mode” for more information.

To trigger reception manually

Hold down the A button for about two seconds.

The watch beeps and reception starts. Ongoing reception is indicated by the “” icon and the receive indicator.

To stop signal reception

Press the A button.

All other buttons besides A are disabled during signal reception.

Receive Icon and Indicator

While reception is in progress, the

 

 

 

 

 

Receive Icon

“ ” icon and the receive indicator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

cycle from “Unstable” through

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“Stable” as shown below. How far

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

they cycle depends on the signal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

strength.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Keep the watch in a location where

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

reception is stable while reception is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

in progress.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Receive Indicator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When reception is successful

After reception is complete, the watch adjusts its current time setting and then its current date setting.

The “” icon and the receive indicator remain on the display to indicate that reception was successful.

When reception fails

The watch does not adjust its current time setting, and displays “ERROR!” instead.

The display will return to the normal timekeeping screen automatically if you do not perform any operation for about one or two minutes.

Unstable

Stable

Even under optimum reception conditions, it can take about 10 seconds for reception to stabilize.

Use the receive icon and receive indicator to check reception status and to determine the best location for signal reception.

Note that weather, the time of day, surroundings, and other factors can all affect reception.

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Operation Guide 2514/2645

To view the last reception date and time

In the Timekeeping Mode, press the A button.

This displays the date and time that signal reception was complete and the current time and date were adjusted.

To return to the timekeeping screen, press the A button again.

The display will return to the normal timekeeping screen automatically if you do not perform any operation for about one or two minutes.

To turn auto reception on and off

1. In the Timekeeping Mode,

press the B button.

This causes the “” icon and the receive indicator to flash, which indicates the setting screen.

2. Press the D button to toggle auto reception on or off.

Press the D button to toggle auto reception ON and OFF.

Important!

The calibration signals received by this watch include two data groups: an hour-minute-secondgroup and ayear-month-daygroup.

The “” icon is displayed only when both thehour-minute-secondgroup andyear-month-daygroup are received. It will not remain on the display if only thehour-minute-secondgroup is received.

Hour-minute-secondgroup andyear-month-daygroup received

” displayed

Hour-minute-secondgroup only received

” not displayed

If only hour, minute, and second data (no date data) is received, the last reception date shows the date that the receive operation was performed (as kept in the Timekeeping Mode).

3. When the setting is the way you want, press the

Bbutton.

This exits the setting screen.

The display also will exit the setting screen automatically if you do not perform any operation for about two or three minutes.

Specifying the Transmitter Mode

When TYO (Tokyo) is selected as the Home City, you can select either of two different transmitters for reception.

For information about selecting a Home City, see “To manually set the time and date”.

The initial factory default settings of the watch are TYO (Tokyo) for the Home City andFREQ. AT (auto select) for the transmitter mode.

1. In the Timekeeping Mode,

press the B button.

This causes the “” icon and the receive indicator to flash, which indicates the setting screen.

2. Press the C button to change to display the Transmitter Mode setting screen.

3. Press the D button to cycle through the available Transmitter Mode settings, described below.

FREQ. AT

With this setting, the watch automatically selects either the Otakadoya Mountain signal (40kHz) or the Hagane Mountain signal (60kHz), whichever is strongest.

The transmitter that was last received successfully is given priority for the next receive operation.

FREQ. 40

With this setting, the watch always receives the Mt. Otakadoya signal (40kHz).

FREQ. 60

With this setting, the watch always receives the Mt. Hagane signal (60kHz).

4. When the setting is the way you want, press the

Bbutton.

This exits the setting screen.

The display also will exit the setting screen automatically if you do not perform any operation for about two or three minutes.

Calibration Signal Reception

Precautions

Auto reception can be performed while the watch is in the Timekeeping Mode or World Time Mode only.

Operating any button while auto reception is in progress will cause the watch to beep and then exit the receive operation.

Make sure you are within the range of the calibration signal transmitter before performing the reception operation. Remember that geographic contours, nearby buildings, the season, the time of day, can even make reception impossible even when you are within range of the transmitter.

Proper reception may be impossible if there is something blocking the signal. If reception is unsuccessful, try again.

This watch is designed to adjust its current time setting in accordance with the calibration signal transmitted in Japan and the United States only. Note that you will need to make your own adjustments when using this watch outside of Japan or the United States, or in any area that is outside the range of one of the receivable time calibration signal transmitters.

When the watch is unable to adjust its time signal using the calibration signal for some reason, timekeeping accuracy is within

±15 seconds per month.

Strong electrostatic charge can cause timekeeping error.

Signal reception is cancelled if an alarm starts to sound while it is being performed.

The watch's built-incalendar runs up to the year 2039. Signal reception after that causes an error, and the date remains displayed as December 31, 2039.

Troubleshooting

Cannot perform manual reception.

Cause: Manual receive can be performed in the Timekeeping Mode only.

The Home City is set to a city other than TYO (Tokyo),NYC (New York),CHI

(Chicago), DEN (Denver), orLAX (Los Angeles).

Corrective Measures: Perform manual receive in the Timekeeping Mode.

Change Home City to TYO (Tokyo),NYC (New York),CHI (Chicago),DEN (Denver), orLAX (Los Angeles). For details, see “To manually set the time and date”.

The “” icon is not on the display even though auto signal reception is turned on.

Cause: The “” icon appears after the watch successfully receives the

calibration signal and adjusts the current time and date settings.

A single receive operation was not successful.

The “ ” icon is displayed only when both the hour-minute-secondgroup and year-month-daygroup were received. It will not remain on the display if only the hour-minute-secondgroup is received.

The watch is not in the Timekeeping Mode or World Time Mode when an auto

reception time is reached. Corrective Measures: Check to make sure the watch is in a

location where it can receive the signal.

Place the watch in a location where reception conditions are good.

Make sure that the watch is in the Timekeeping Mode or World Time Mode during the auto reception times.

Note that manual reception also clears the “” icon from the display.

Time setting is incorrect following signal reception.

Cause: Summer time is turned on or the wrong Home City is selected.

Corrective Measures: If the time is advanced by one hour, it probably means that summer time (indicated by the DST indicator on the display) is turned on. If the time is off by more than one hour, it probably means that the Home City is selected. Correctly configure the summer time and Home City settings as detailed under “To manually set the time and date”.

If you cannot receive the calibration signal or if the current time setting is incorrect after signal reception, check the current setup of the watch.

The following are the watch’s factory default settings, which are configured automatically whenever you have the battery of the watch replaced.

Auto Receive

On

 

 

Transmitter

Auto Japan transmitter select

(40kHz/ 60kHz)

 

 

 

Home City

Tokyo

 

 

Summer Time

Auto (according to signal data)

4