CASIO GW-M5610U OPERATION MANUAL

Quick Links

• Navigating between Modes
• Time Adjustment Using a Time Signal
• Swapping Your Home Time and World Time

Precautions

Operating Precautions

• Water Resistance: Information applies to watches with WATER RESIST or WATER RESISTANT marking.
• Water Resistance Under Daily Use: Details resistance for hand washing, rain, water-related work, swimming, windsurfing, and skin diving based on markings (No BAR mark, 5 BAR, 10 BAR, 20 BAR).
• Enhanced Water Resistance Under Daily Use: Details resistance for 5 Atmospheres (5BAR) watches.
• 10 Atmospheres: Details resistance for 10 BAR watches.
• 20 Atmospheres: Details resistance for 20 BAR watches.
• Do not use for scuba diving or diving requiring air tanks.
• Watches without WATER RESIST markings are not protected against sweat. Avoid exposure to large amounts of sweat or moisture, or direct splashing.
• Avoid operating crown or buttons while submerged or wet.
• Do not wear while bathing, in saunas, or high temperature/humidity environments.
• Do not wear while washing hands/face, doing housework, or tasks involving soaps/detergents.
• After seawater submersion, rinse with plain water to remove salt and dirt.
• For water resistance, have gaskets replaced periodically (every 2-3 years).
• A trained technician will inspect water resistance during battery replacement.
• Leather bands: Avoid swimming or activities causing direct water exposure.
• Watch glass may fog due to sudden temperature drops. Fogging should clear quickly. If not, stop use and contact a service center.
• Water-resistant watches are tested per ISO regulations.
• Band: Do not overtighten the band to prevent skin irritation. Ensure enough space for a finger.
• Deterioration, rust, or other conditions can cause bands to break or detach, leading to loss or injury. Keep bands clean.
• Stop using a band immediately if you notice loss of flexibility, cracks, discoloration, looseness, or other abnormalities. Seek service.
• Temperature: Avoid extreme temperatures (hot or cold). Extreme temperatures can cause time loss, stoppage, or malfunction. LCD may be difficult to read below 0°C (32°F) and above +40°C (104°F). Avoid leaving the watch in areas hotter than +60°C (140°F) for long periods.
• Impact: Watch is designed for normal daily use and light activity. Dropping or strong impact can lead to malfunction. Shock-resistant designs (G-SHOCK, BABY-G, G-MS) can be used during activities like chain saw operation or strenuous sports.
• Magnetism: Avoid strong magnetism (from medical equipment, etc.) as it can cause malfunction and damage to electronic components.
• Electrostatic Charge: Exposure to strong electrostatic charge can cause incorrect time display, temporary blank display, or rainbow effect. It can also damage electronic components.
• Chemicals: Avoid contact with thinners, gasoline, solvents, oils, cleaners, adhesives, paints, medicines, or cosmetics containing these. Contact can cause discoloration or damage to resin, leather, and other parts.
• Storage: If not using for a long time, wipe clean, store in a cool, dry place.
• Resin Components: Avoid storing wet resin components together with other items to prevent color transfer. Dry thoroughly before storing. Avoid prolonged exposure to direct sunlight (UV rays) or dirt, which can cause discoloration. Friction can cause discoloration of painted components. Strong rubbing of printed areas on bands can cause discoloration. Fluorescent colors may fade if left wet. Semi-transparent resin parts can discolor due to sweat, dirt, high temperatures, and humidity. Daily use and long-term storage can lead to deterioration, breaking, or bending of resin components.
• Leather Band: Avoid storing wet leather bands with other items to prevent color transfer. Dry thoroughly with a soft cloth before storing. Avoid prolonged exposure to direct sunlight (UV rays) or dirt, which can cause discoloration.
• Metal Components: Clean metal components regularly to prevent rust. Wipe with a soft cloth and allow to air dry. Use a soft toothbrush or similar tool with a weak solution of water and mild neutral detergent or soapy water for cleaning. Rinse and dry thoroughly. Wrap the watch case with plastic wrap to prevent contact with detergent.
• Bacteria and Odor Resistant Band: Keeps the band clean for comfort and hygiene. Suppresses organism and bacteria formation. Does not protect against rash due to allergic reactions.
• Liquid Crystal Display: Figures may be difficult to read from an angle.
• Note: CASIO Computer Co., Ltd. is not responsible for any damage or loss resulting from use or malfunction of the watch.

User Maintenance

Caring for Your Watch

• Keep your watch and band clean by wiping with a soft cloth to remove dirt, sweat, and water.
• Rinse with clean fresh water after exposure to seawater or mud.
• For metal bands or resin bands with metal parts, use a soft toothbrush or similar tool with a weak solution of water and mild neutral detergent or soapy water. Rinse and dry thoroughly. Wrap the watch case with plastic wrap to prevent contact with detergent.
• For resin bands, wash with water and dry with a soft cloth. Smudge patterns may appear on resin bands but do not affect skin or clothing; wipe with a cloth to remove.
• Clean leather bands with a soft cloth.
• Periodically rotate the crown and press buttons to maintain proper operation.

Dangers of Poor Watch Care

• Rust: Rust can form if the watch is not cleaned after it becomes dirty. Rust can cause sharp areas on metal components, cause band pins to fly out, or interfere with performance. Stop use and seek service if rust is noticed.
• Premature Wear: Leaving sweat or water on a resin band or bezel, or storing in high moisture areas, can lead to premature wear, cuts, and breaks.
• Skin Irritation: Individuals with sensitive skin may experience irritation. Keep bands clean. Remove watch and consult a skin care professional if irritation occurs.
• Battery: The special rechargeable battery is not user-removable. Use of an incorrect battery can damage the watch. The rechargeable battery is charged by the solar panel. Capacity or charging efficiency may deteriorate over time. Contact a service center if operation time is too short.

Before Getting Started...

This section provides an overview of the watch and introduces convenient ways it can be used.

Watch Features

• Solar Charging: Sunlight and artificial light generate electricity for watch operation.
• Time Signal Reception: The watch receives a radio signal containing time information to keep its time setting accurate.
• World Time: Display current time in 48 cities (31 time zones) and UTC. Up to five cities can be selected for World Time Mode.
• Alarm: An alarm sounds at a specified time.
• Stopwatch: Measures elapsed time in 1/100-second units for the first hour, up to 24 hours.
• Timer: Counts down from a specified start time. An alarm sounds when the countdown reaches zero.

General Guide

Indicators

Diagram showing watch face with indicators and their meanings:

• 1: Appears when time signal receive operation is successful.
• 2: Displayed while Power Saving is enabled.
• 3: Displayed during p.m. times while 12-hour timekeeping is used.
• 4: Displayed while the button operation tone is disabled.
• 5: Displayed while the watch is indicating summer time.
• 6: Displayed while Auto Light is enabled.
• 7: Shows the current charge level.
• 8: Displayed while the snooze alarm is turned on.
• 9: Displayed while an alarm is turned on.
• 10: Displayed while the hourly time signal is enabled.

Buttons

• A button: Hold for at least two seconds to display the setting screen.
• B button: Press to turn on illumination.
• C button: Cycles between watch modes. Hold for at least one second to return to Timekeeping Mode.
• D button: Changes settings on any setting screen.

Charging

This watch runs on power supplied from a rechargeable battery charged by a solar panel integrated into the watch face. Power is generated when the face is exposed to light.

Charging the Watch

• When not wearing the watch, place it in a location exposed to bright light.
• While wearing the watch, ensure the face (solar panel) is not blocked from light by clothing sleeves. Power generation efficiency is reduced even when the face is partially blocked.

Checking the Charge Level

A display indicator shows the watch's current charge level:

• Charge Level 1: Good: All functions enabled.
• Charge Level 2: Good: All functions enabled.
• Charge Level 3: Low: [L] and [LOW] flash. Functions like time signal reception, illumination, and sounds are disabled. Only Timekeeping Mode functions.
• Charge Level 4: Low: [CHG] flashes. All functions are disabled.
• Charge Level 5: Dead: Digital display goes blank. Memory data is lost, and settings return to factory defaults.

Important! Should the battery go low or dead, expose the face (solar panel) to light as soon as possible.

Charging Time Guidelines

The table below shows approximate charging times required for 1 day of operation and times required to achieve the next charge level under various light conditions (lux).

Viewing the Face in the Dark

The watch has a light that illuminates the face.

• To illuminate the face manually: Press (B).
• Illumination turns off automatically if an alarm sounds.
• Important! Frequent use of illumination will run down the battery.
• Note: Display illumination is disabled during alarm, timer alerts, beeper sounds, or time calibration reception.
• To illuminate the face when Auto Light is enabled: Face illumination turns on automatically when the watch is positioned at an angle of 40 degrees or more.

Time Adjustment

Your watch can receive time calibration signals and adjust its date and time setting.

Time Adjustment Using a Time Signal

Overview

The watch's time and day settings can be configured according to a received time calibration signal.

Important!

To ensure correct time adjustment, specify the area where you are using the watch by setting your Home City.

Note

• Time signal reception is supported in limited areas. If reception is not possible, adjust time and day settings manually.

Specifying the Illumination Duration

You can select either 1.5 or 3 seconds for illumination duration.

1. Enter the Timekeeping Mode.
2. Hold down (A) for at least two seconds until the Home City name appears.
3. Press (C) 12 times. [1] or [3] will appear on the display.
4. Press (D) to toggle between [1] (1.5-second illumination) and [3] (3-second illumination).
5. Press (A) to complete the setting.

Configuring the Auto Light Setting

1. Enter the Timekeeping Mode.
2. Hold down (B) for at least three seconds to toggle Auto Light between enabled and disabled. [LT] is displayed when Auto Light is enabled.

Note

• Auto Light is disabled when any of the following occur: Alarm, timer alert, or other beeper sounding; Time calibration reception in progress.
• Auto Light may operate unintentionally and drain the battery if the watch is blocked from light by your sleeve.
• Electro-static charge or magnetism can interfere with auto light operation.
• A slight rattling sound may be heard due to the auto light switch operation; this does not indicate malfunction.
• Auto Light is disabled while [CHG] is shown on the display.

Signal Reception

Appropriate Signal Reception Location

A time calibration signal can be received near a window. Position the watch with its 12 o'clock side facing the window. Keep metal objects away. Do not move the watch or perform any operations during reception.

Time Signal Reception Ranges

Diagrams show reception ranges for Japan (JJY), China (BPC), U.S. (WWVB), and U.K./Germany (MSF/DCF77) time calibration signals.

Note: Reception may be affected by geographic contours, weather, season, time of day, or wireless noise, even within the normal reception range.

Auto Time Calibration Signal Receive

An automatic time calibration signal receive operation occurs between midnight and 5:00 a.m. Once successful, no more auto receives occur that day. Place the watch near a window. [RCVD] flashes during reception. Successful reception adjusts time and day settings automatically, and the [RCVD] indicator appears.

Note: Receive operation typically takes 3 to 16 minutes.

Enabling and disabling Auto Receive

You can stop auto receive by disabling the Auto Receive setting.

1. Enter the Timekeeping Mode.
2. Hold down (A) for at least two seconds until the Home City name appears.
3. Press (C) 13 times. [On] or [OFF] flashes on the display.
4. Press (D) to toggle between [On] (Auto Receive enabled) and [OFF] (Auto Receive disabled).
5. Press (A) to complete the setting.

Note: The setting operation exits automatically after two or three minutes of non-operation.

Manual Time Calibration Signal Receive

1. Place the watch near a window or other location appropriate for signal reception.
2. Enter the Timekeeping Mode.
3. Hold down (D) for at least two seconds until [RCVD] flashes. This indicates the receive operation has started.

Receive Level Indicator

While a receive operation is in progress, the level indicator shows the signal level ([L1], [L2], [L3]) to help find a location with stable reception.

Checking the Last Time Adjustment Result

1. Enter the Timekeeping Mode.
2. Press (D). This displays the date and time of the last successful receive operation.

Note: [RCVD] will not be displayed if the time and/or date were adjusted manually after a successful receive operation.

Signal Reception Precautions

• If the watch cannot adjust its time via a signal, average timekeeping accuracy is within ±15 seconds per month.
• An internal decoding process may cause a slight time deviation (less than one second).
• Time calibration signal reception is not possible under the following conditions: low battery power, not in Timekeeping or World Time Mode, Level 2 power saving, timer countdown in progress, Home City setting does not support signal reception, or outside the reception range.
• Summer time may not be applied correctly if summer time rules are changed by authorities.
• As of July 2020, China does not observe summer time.

World Time

You can view the current time in 48 cities (31 time zones) and UTC.

Checking World Time

1. Enter the World Time Mode.
2. Entering World Time Mode shows the World Time number and city name, then the display changes.
3. To change the selected World Time city, press (D).

World Time City Setting

You can specify up to five cities as World Time favorites. You can also enable or disable summer time.

1. Enter the World Time Mode.
2. Use (D) to display the World Time number for the city you want to configure.
3. Hold down (A) for at least two seconds until [WT] flashes.
4. Use (B) and (D) to display the desired city.
5. To change the summer time setting, press (C).
6. Use (D) to select a summer time setting: [OFF] (standard time) or [ON] (summer time).
7. Press (A) to complete the setting operation.

Note: [UTC] selected cities do not allow summer time settings. Summer time settings apply only to the selected city.

Swapping Your Home Time and World Time

In World Time mode, press (A) and (B) simultaneously to swap your Home City time with your World Time.

Alarm

The watch beeps when the alarm time is reached. You can configure up to four standard daily alarms and one daily alarm with snooze. The hourly time signal beeps every hour.

• Snooze sounds up to seven times at five-minute intervals.
• Alarm sound is muted when battery power is low or the watch is in Level 2 power saving.

Configuring Alarm Settings

1. Enter the Alarm Mode.
2. Use (D) to display the alarm screen (alarm number [1] to [4] or [SNZ]) you want to change.
3. Hold down (A) for at least two seconds. The hours digits flash.
4. Use (B) and (D) to change the hour setting. [P] indicates p.m. in 12-hour timekeeping.
5. Press (C). The minutes digits flash.
6. Use (B) and (D) to change the minute setting.
7. Press (A) to exit the setting screen.

Note: A beeper sounds for 10 seconds when the alarm time is reached. The watch returns to Timekeeping Mode after two or three minutes of non-operation.

Turning Off an Alarm or the Hourly Time Signal

To stop an alarm or the hourly time signal from sounding, perform the steps below to turn it off.

• To have an alarm or hourly time signal sound again, turn it back on.
• Indicators ([ALM], [SNZ], [SIG]) are displayed while alarms or the hourly time signal are turned on. These indicators disappear when all are turned off.

Stopwatch

The stopwatch measures elapsed time up to 23 hours, 59 minutes, 59 seconds (24 hours).

Measuring Elapsed Time

1. Enter the Stopwatch Mode.
2. Use the operations below to measure elapsed time: Start → Stop → Reset.

Elapsed time is shown in 1/100-second units for the first hour, then in one-second units.

Measuring a Split Time

1. Enter the Stopwatch Mode.
2. Use the operations below to measure elapsed time: Start → Split → Resume → Stop → Reset.

Elapsed time is shown in 1/100-second units for the first hour, then in one-second units.

Timing the First and Second Place Finishers

1. Enter the Stopwatch Mode.
2. Use the operations below to measure elapsed time: Start → 1st Finisher → 2nd Finisher.

Elapsed time is shown in 1/100-second units for the first hour, then in one-second units.

Press (A) to reset the stopwatch to all zeros.

Timer

The timer counts down from a start time. A beeper sounds when the countdown reaches zero. The beeper is muted when battery power is low.

Setting the Time

The countdown start time can be set in 1-second units up to 24 hours. If a countdown is in progress, reset the timer to its current start time before setting.

Using the Timer

1. Enter the Timer Mode.
2. Hold down (A) for at least two seconds. The hours digits flash.
3. Use (B) and (D) to change the timer hours setting.
4. Press (C). The minutes digits flash.
5. Use (B) and (D) to change the timer minutes setting.
6. Press (C). The seconds digits flash.
7. Use (B) and (D) to change the seconds setting.
8. Press (A) to exit the setting screen.

Note: The setting operation exits automatically after two or three minutes of non-operation. Setting a start time of [0:00 00] performs a 24-hour countdown.

To stop the timer: Press any button to stop the tone. To reset a paused countdown, press (A).

Other Settings

This section explains other watch settings you can configure.

Changing the Date Display Format

You can select either month/day or day/month as the date display format.

1. Enter the Timekeeping Mode.
2. Hold down (A) for at least two seconds until the Home City name appears.
3. Press (C) nine times. This displays a screen for selecting the date display format.
4. Use (D) to select a date display format: [M.DD] (Month, Day) or [DD.M] (Day, Month).
5. Press (A) to exit the setting screen.

Note: The setting operation exits automatically after two or three minutes of non-operation.

Specifying the Day of the Week Language

You can select any one of six languages for the day of the week display in the Timekeeping Mode.

1. Enter the Timekeeping Mode.
2. Hold down (A) for at least two seconds until the Home City name appears.
3. Press (C) 10 times. This causes the language setting to flash.
4. Use (D) to select a language: [ENG] (English), [ESP] (Spanish), [FRA] (French), [DEU] (German), [ITA] (Italian), [PyC] (Russian).
5. Press (A) to exit the setting screen.

Note: The setting operation exits automatically after two or three minutes of non-operation.

Enabling the Button Operation Tone

Use the procedure below to enable or disable the tone that sounds when you press a button.

1. Enter the Timekeeping Mode.
2. Hold down (A) for at least two seconds until the Home City name appears.
3. Press (C) 11 times. This causes [KEY] or [MUTE] to flash on the display.
4. Use (D) to select [KEY] (Operation tone enabled) or [MUTE] (Operation tone muted).
5. Press (A) to exit the setting screen.

Note: The setting operation exits automatically after two or three minutes of non-operation. Alarm and timer tones will still sound even while the operation tone is muted.

Configuring Power Saving Function Settings

1. Enter the Timekeeping Mode.
2. Hold down (A) for at least two seconds until the Home City name appears.
3. Press (C) 14 times. This displays [POWER SAVING].
4. Press (D) to toggle between [On] (Power Saving enabled) and [OFF] (Power Saving disabled).
5. Press (A) to exit the setting screen.

Note: The setting operation exits automatically after two or three minutes of non-operation.

Troubleshooting

Signal Reception (Time Calibration Signal)

• Q1 The watch cannot perform a receive operation.
  • Is the watch's battery charged? Keep exposed to light until it recharges sufficiently.
  • Is the watch in the Timekeeping Mode or World Time Mode? Enter the Timekeeping Mode or World Time Mode.
  • Is your Home City setting correct? Change your Home City setting to correctly reflect your location.
  • After checking the above, the watch still cannot perform a receive operation. Time calibration signal reception is not possible under the conditions described below (when watch is at Level 2 power saving, or during timer countdown operation). If successful reception is not possible, adjust time and day settings manually.
• Q2 The signal receive operation always fails.
  • Is the watch in an appropriate location? Check surroundings and move the watch to a better location.
  • Did you avoid touching the watch during reception? Minimize movement and do not operate the watch.
  • Is an alarm configured to sound during reception? Disable the alarm.
  • Is the signal transmitter transmitting? Try again later.
• Q3 Signal reception should have been successful, but the watch's time and/or day is wrong. Adjust time and day settings manually.

World Time

• Q1 The time for a World Time City is not correct. The summer time setting may be incorrect. Configure the World Time City Setting.

Charging

• Q1 The watch does not work even though it is exposed to light. The watch stops operating when the battery goes dead. Keep the watch exposed to light until it recharges sufficiently.
• Q2 [H], [M], and [L] are flashing on the display. The watch is in charge recovery mode. Wait until the recovery process is complete (about 15 minutes). Function availability will be temporarily limited.
• Q3 [CHG] is flashing on the display. The charge level is extremely low. Immediately expose the watch to light to charge it.

Alarm

• Q1 The alarm does not sound. Is the alarm setting turned on? If not, turn it on.

Other

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