Casio 5640 - User Manual

To Next Page

Operation Guide 5640

E-9

Hand Home Position Adjustment .......................................................................E-70

To adjust home positions manually .................................................................. E-70

Moving the Hands for Easy Viewing of Digital Information .............................E-72

To move the hands to view digital information ................................................ E-73

To return the hands to their normal positions .................................................. E-73

Other Settings ...................................................................................................... E-75

To enable or disable the button operation tone ............................................... E-75

To enable or disable Power Saving .................................................................. E-77

Troubleshooting ...................................................................................................E-78

Specifications ......................................................................................................E-85

Operating Precautions ........................................................................................ E-88

User Maintenance ...............................................................................................E-98

E-8

Using the Countdown Timer ...............................................................................E-55

To enter the Countdown Timer Mode .............................................................. E-55

To specify the countdown start time ................................................................ E-55

To perform a countdown timer operation ........................................................ E-57

To stop the alarm ............................................................................................. E-57

Using the Alarm ...................................................................................................E-58

To enter the Alarm Mode ................................................................................. E-58

To set an alarm time ......................................................................................... E-59

To test the alarm .............................................................................................. E-60

To enable or disable an alarm or the Hourly Time Signal ................................. E-61

To stop a sounding alarm................................................................................. E-61

Illumination ...........................................................................................................E-63

To turn on illumination manually ...................................................................... E-63

To change the illumination duration ................................................................. E-64

To enable or disable the auto light switch ....................................................... E-67

E-7

Configuring Home City Settings.........................................................................E-40

To configure Home City settings...................................................................... E-40

To change the Daylight Saving Time (summer time) setting ............................ E-42

Configuring Current Time and Date Settings Manually ................................... E-44

To change the current time and date settings manually .................................. E-44

Using the World Time Mode ............................................................................... E-48

To enter the World Time Mode ........................................................................ E-48

To view the time in another time zone ............................................................. E-48

To specify standard time or daylight saving time (DST) for a city .................... E-49

To swap your Home Time and World Time Cities ............................................ E-50

Using the Stopwatch ...........................................................................................E-52

To enter the Stopwatch Mode ......................................................................... E-52

To perform an elapsed time operation ............................................................. E-53

To pause at a split time .................................................................................... E-53

To measure two finishes .................................................................................. E-53

E-6

Contents

About This Manual ................................................................................................. E-1

Things to check before using the watch .............................................................E-2

Charging the Watch ............................................................................................. E-10

To recover from the sleep state ....................................................................... E-18

Radio Controlled Atomic Timekeeping .............................................................E-19

To get ready for a receive operation ................................................................ E-24

To perform manual receive .............................................................................. E-27

To check the latest signal reception results ..................................................... E-31

To enable or disable auto receive .................................................................... E-32

Mode Reference Guide .......................................................................................E-35

Timekeeping ......................................................................................................... E-39

E-5

The watch is now ready for use.

x For details about the watch’s radio controlled timekeeping feature, see “Radio

Controlled Atomic Timekeeping” (page E-19).

E-4

2. Check the Home City and the daylight saving time (DST) setting.

Use the procedure under “To configure Home City settings” (page E-40) to configure

your Home City and daylight saving time settings.

Important!

x Proper time calibration signal reception and World Time Mode data depend on

correct Home City, time, and date settings in the Timekeeping Mode. Make sure

you configure these settings correctly.

3. Set the current time.

x To set the time using a time calibration signal

See “To get ready for a receive operation” (page E-24).

x To set the time manually

See “Configuring Current Time and Date Settings Manually” (page E-44).

E-3

Go to step 2.

The watch is charged.

For details about charging, see “Charging the Watch” (page E-10).

Power is low. Charge the watch by placing it in a location where it is exposed to

light. For details, see “Charging the Watch” (page E-10).

E-2

Things to check before using the watch

1. Check the battery power level.

Is H or M indicated as the battery power indicator (page E-13)?

Battery power indicator

YES

E-1

About This Manual

x 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 examples

in this manual are shown using dark figures on a light

background.

x Button operations are indicated using the letters shown

in the illustration.

x Note that the product illustrations in this manual are

intended for reference only, and so the actual product

may appear somewhat different than depicted by an

illustration.

ENGLISH

Congratulations upon your selection of this CASIO watch.

To ensure that this watch provides you with the years of service for which it is

designed, carefully read and follow the instructions in this manual, especially the

information under “Operating Precautions” and “User Maintenance”.

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 your watch or

its malfunction.

MA2010-EA

Main Page

Need help?

Do you have a question about the Casio 5640 and is the answer not in the manual?

This document describes the CASIO Operation Guide 5640, a solar-powered, radio-controlled atomic watch with various timekeeping and utility functions.

Function Description

The watch features Timekeeping Mode for displaying the current date and time, configuring Home City and Daylight Saving Time (DST) settings, manually adjusting time and date, performing time calibration receive operations, checking the latest signal reception results, and switching between 12-hour and 24-hour timekeeping. It also displays an alarm countdown.

The World Time Mode allows viewing the current time in 48 cities across 31 time zones globally, with the ability to swap Home Time and World Time Cities.

The Stopwatch Mode measures elapsed time, split times, and two finishes, with a measuring unit of 1/100 second and a capacity of 59 minutes, 59.99 seconds.

The Countdown Timer Mode offers a countdown range from one second to 100 minutes, with an alarm sounding when the countdown reaches zero.

The Alarm Mode supports setting five independent daily alarms and an Hourly Time Signal, which beeps twice every hour.

The watch incorporates a Double LED light for both the face and the digital display, featuring Full auto LED light, Super illuminator, and selectable illumination durations (approximately 1.5 or 3 seconds), with afterglow.

Radio-controlled Atomic Timekeeping enables the watch to receive time calibration signals and update its time settings automatically in areas covered by transmitters in Japan, North America, Europe, and China. Auto receive operations occur up to six times a day (five times for the Chinese signal) between midnight and 5 a.m., with manual receive also possible. Signal reception is normally better at night and can take from three to eight minutes, or up to 16 minutes.

Power Saving is an enabled feature that automatically puts the watch into a sleep state when left in the dark for a certain period. There are two levels: "display sleep" (60-70 minutes in dark, digital display disabled, all functions enabled) and "function sleep" (6 or 7 days in dark, digital display and hands stopped at 12 o'clock, all functions disabled except timekeeping). The watch will not enter sleep state between 6:00 AM and 9:59 PM, or while in Stopwatch or Countdown Timer Mode.

The watch also includes a Power Recovery Mode, indicated by flashing battery power indicators (H, M, L), which occurs after multiple illumination, beeper, and/or high-speed hand movement operations. During this mode, illumination, alarm, countdown timer alarm, and hourly time signal operations are disabled for about 15 minutes until power recovers.

Important Technical Specifications

Accuracy at normal temperature: ±15 seconds a month (without signal calibration).
Timekeeping: Hour, minute, second, p.m. (P), year, month, day, day of the week, alarm countdown. Time format: 12-hour and 24-hour.
Calendar system: Full Auto-calendar pre-programmed from the year 2000 to 2099.
Time Calibration Signal Reception: Auto receive 6 times a day (5 times a day for the Chinese calibration signal); remaining auto receives cancelled as soon as one is successful; manual receive.
Receivable Time Calibration Signals:
- Mainflingen, Germany (DCF77, 77.5 kHz)
- Anthorn, England (MSF, 60.0 kHz)
- Fort Collins, Colorado, USA (WWVB, 60.0 kHz)
- Fukushima, Japan (JJY, 40.0 kHz)
- Fukuoka/Saga, Japan (JJY, 60.0 kHz)
- Shangqiu City, Henan Province, China (BPC, 68.5 kHz)
World Time: 48 cities (31 time zones).
Stopwatch: Measuring unit: 1/100 second; capacity: 59'59.99".
Countdown Timer: Measuring unit: 1 second; range: 100 minutes.
Alarms: 5 Daily alarms; Hourly Time Signal.
Light: Double LED light (Full auto LED light, Super illuminator, selectable illumination duration (approx. 1.5 or 3 seconds), afterglow) for face and digital display.
Power Supply: Solar panel and one rechargeable battery.
Approximate battery operating time: 11 months under specified conditions (Display on 18 hours/day, sleep state 6 hours/day, 1 illumination operation, 10 seconds alarm operation, 4 minutes signal reception, 1 hand movement for easy viewing of digital information per day).

Usage Features

Charging: The watch charges whenever exposed to light. Best performance is achieved by exposing it to the strongest available light. Leaving the watch in bright light for charging can cause it to become quite hot; care should be taken to avoid burn injury.
Battery Power Indicator: Displays five levels (H, M, L, CHG, all functions disabled) to indicate the watch's power level. Flashing LOW message at Level 3 indicates very low battery.
Hand Home Position Adjustment: Allows manual adjustment of analog hands if they become misaligned due to magnetism or impact.
Moving the Hands for Easy Viewing of Digital Information: Analog hands can be temporarily moved out of the way to better view digital information.
Button Operation Tone: Can be enabled or disabled as desired.
Auto Return: The watch automatically returns to Timekeeping Mode if no button operation is performed for two or three minutes in Alarm Mode, or if a setting screen is left flashing for two or three minutes.
Scrolling: Buttons are used to scroll through data in setting screens, with high-speed scrolling available by holding them down.
Water Resistance: Varies by model (5BAR, 10BAR, 20BAR). Precautions include not operating buttons underwater, avoiding hot water, and rinsing with fresh water after seawater exposure.

Maintenance Features

Caring for Your Watch: Keep the watch clean by frequently wiping with a soft cloth to remove dirt, sweat, water, and other foreign matter.
Cleaning:
- For metal or resin bands with metal parts: Use a soft toothbrush with a weak solution of water and mild neutral detergent, then rinse and wipe dry.
- For resin bands: Wash with water and wipe dry with a soft cloth.
- For leather bands: Wipe with a soft cloth to clean water and sweat.
Rust Prevention: Clean dirt from metal components to prevent rust formation, especially after exposure to sweat or water.
Band Care: Avoid tightening the band too tightly. Keep the band clean to prevent deterioration, rust, and skin irritation. Stop using the band immediately if any abnormality is noticed.
Chemicals: Avoid contact with thinners, gasoline, solvents, oils, fats, cleaners, adhesives, paints, medicines, or cosmetics, as these can cause discoloration or damage.
Storage: If not using for a long time, wipe thoroughly and store in a cool, dry place. Avoid prolonged exposure to direct sunlight or high temperatures.
Gaskets: Have the watch's gaskets replaced periodically (every two or three years) to maintain water resistance.