Casio Watch User Manual

Important Information

Please read this important information before proceeding.

Battery

The battery in your watch was installed at the factory. If it shows signs of insufficient power (e.g., dim display, no backlight), it should be replaced by an authorized CASIO dealer or distributor.

Water Resistance

Watches are classified by water resistance rating from I to V. Consult the table below to understand your watch's rating for proper use.

Notes for respective ratings:

I: Water resistant. Avoid any moisture. Never attempt to open the case or remove the back cover.

II: If water enters the watch, have it checked immediately by an authorized CASIO dealer or distributor.

III: Do not press watch buttons underwater. If the watch is exposed to salt water, rinse it thoroughly and dry it.

IV: Watches can be used for diving (except for depths requiring a helium-oxygen mixture).

V: Some water-resistant watches have leather straps. Do not wear these watches while swimming or engaging in other activities where the strap may get wet.

Care of Your Watch

• Never attempt to open the case or remove the back cover. Replacing the gasket that protects the watch from water and dust should be done every 2-3 years.
• If water enters the watch, have it checked immediately by an authorized CASIO dealer or distributor.
• Avoid exposing the watch to extreme temperatures.
• While the watch is designed for normal use, avoid rough handling and dropping it.
• Do not fasten the strap too tightly. A finger should fit between your wrist and the strap.
• Clean the watch and strap with a dry, soft cloth, or a soft cloth dampened with a mild neutral detergent solution. Never use volatile agents such as gasoline, solvents, or spray cleaners.
• When not in use, store the watch in a dry place.
• Avoid exposing the watch to gasoline, cleaning solvents, aerosol sprays, adhesives, paint, etc. Chemical reactions caused by these materials can damage gaskets, the case, and the watch's finish.
• Some models feature silk-screened graphics on their straps. Be careful when cleaning such straps to avoid damaging these designs.
• For watches with resin straps: A white powdery substance may appear on the strap. This substance is harmless to your skin or clothing and can be easily removed by wiping with a cloth. Sweat or moisture on a resin strap, or storing it in high humidity, can lead to damage, tearing, or cracking. To ensure a long life for your resin strap, wipe it with a soft cloth whenever possible to remove dirt and moisture.
• For watches with fluorescent cases and straps: Prolonged exposure to direct sunlight can cause the fluorescent color to fade gradually. Prolonged contact with moisture can also cause the fluorescent color to fade. Wipe off any moisture from the watch surface as soon as possible. Prolonged contact with any other wet surface can cause the fluorescent color to fade. Ensure the fluorescent surface is dry and avoid contact with other surfaces.
• Strong friction of a surface with fluorescent paint against another surface may transfer the fluorescent paint to that surface.

CASIO COMPUTER CO., LTD. is not responsible for any damage that may occur from the use of this watch and does not accept claims from third parties.

General Description of Operating Modes

The illustration shows a general view of the watch in the Timekeeping Mode. Pressing the [Button C] cycles through the modes in the following order: Timekeeping Mode → World Time Mode → Countdown Timer Mode → Stopwatch Mode → Alarm Mode → Analog Timekeeping Mode → Timekeeping Mode.

• In any mode, press [Button L] to illuminate the display.
• In any mode, press [Button C] to return to the Timekeeping Mode.

Timekeeping Mode

The time displayed is synchronized with the time in the Analog Timekeeping Mode.

Setting the Time and Date

1. In the Timekeeping Mode, press [Button A]. The seconds display will flash.
2. Press [Button C] to cycle through the settings in the following order: City Code → Daylight Saving Time (DST) → 12/24 Hour Format → Seconds → Hour → Minute → Year → Month → Day → Power Saving Mode → City Code.
3. If you select Seconds (seconds display flashing), press [Button D] to reset the seconds to 00. If you press [Button D] when the seconds are between 30 and 59, the seconds will be reset to 00 and 1 will be added to the minutes. If the seconds are between 00 and 29, the minutes will not change.
4. To change minutes, hours, etc., use [Button D] to increase the value and [Button B] to decrease it.
5. To switch between 12/24 hour formats, press [Button D] in the Timekeeping Mode. With the 12-hour format, 'P' indicates PM.
6. Press [Button D] to turn Daylight Saving Time (DST) ON or OFF.
7. Press [Button D] and [Button B] to select a City Code.
8. Press [Button D] to turn Power Saving Mode ON or OFF.
9. Holding down a button allows you to change values at a faster rate.
10. The day of the week is set automatically according to the date.
11. You can set the year from 2000 to 2099.
12. After setting the date and time, press [Button A] to return to the Timekeeping Mode.
13. If you do not press any buttons for a certain period, the watch will automatically return to the Timekeeping Mode.

Analog Timekeeping Mode

The analog time is synchronized with the current time. If the analog time appears inaccurate, set it manually:

1. In the Analog Timekeeping Mode, press and hold [Button A] until the current time display starts flashing.
2. Use [Button D] and [Button B] to set the current time. Pressing [Button D] advances the time by 20 seconds. Pressing [Button B] while holding [Button D] allows for faster adjustment. Press any button to stop the rapid adjustment.
3. After setting the time, press [Button A].
4. To return to the Timekeeping Mode, press [Button C].

Backlight

Press [Button L] in any mode to illuminate the display for two seconds. The backlight uses electroluminescent (EL) elements, whose brightness decreases after prolonged use. A faint audible signal may be heard during illumination; this is normal and not a malfunction. Backlight is difficult to see in direct sunlight. Frequent use of the backlight shortens battery life.

Auto Backlight

You can turn the auto backlight function ON or OFF by pressing and holding [Button L] for 2 seconds in the Timekeeping Mode. The auto backlight activates automatically when your hand is tilted at an angle of approximately 40° or more. Do not use the auto backlight feature when it could be hazardous or distracting, such as when riding a motorcycle or bicycle.

World Time Mode

This mode allows you to view the local time in any of 30 cities worldwide (29 time zones).

Viewing Time in Another Time Zone

• In World Time Mode, press [Button D] or [Button B] to select a city to view its time.
• Pressing [Button A] allows you to view the city name and its current time.

Setting Daylight Saving Time (DST)

1. In World Time Mode, press [Button D] or [Button B] to select a city for which you want to set DST.
2. Press and hold [Button A] to turn DST ON or OFF for the selected city.

Alarm Mode

You can set various daily alarms. When an alarm time is reached, the alarm sounds for 10 seconds. If the hourly chime is enabled, the watch will sound a short beep at the start of each hour.

Setting an Alarm

1. In the Alarm Mode, press [Button D] to cycle through the alarm types: AL1 → AL2 → AL3 → AL4 → AL5 → 00 (Hourly Chime) → AL1.
2. After selecting an alarm type, press and hold [Button A]. The hour digits will flash, indicating they are selected for setting. The alarm is automatically turned ON at this point.
3. Press [Button C] to cycle through the settings: Hour → Minute → Hour.
4. Use [Button D] to increase the value and [Button B] to decrease it. Holding a button allows for faster adjustment.
5. The 12/24 hour format matches the format set in the Timekeeping Mode. When using the 12-hour format, ensure you set AM/PM correctly.
6. After setting the alarm, press [Button A] to return to the Alarm Mode.

Checking the Alarm Sound

In the Alarm Mode, press [Button B] to test the alarm sound.

• Press [Button D] in the Alarm Mode to select an alarm type.
• Press [Button B] to turn the selected alarm ON or OFF. The display shows 'AL' for any of the 4 alarms, and 'SIG' for the hourly chime.

Countdown Timer Mode

The countdown timer can be set from 1 to 60 minutes. A sound alarm will sound when the countdown reaches zero.

Setting the Countdown Timer Start Time

1. In the Countdown Timer Mode, press and hold [Button A]. The hour digits will flash, indicating they are selected for setting.
2. Press [Button C] to cycle through the settings: Minutes → Auto Repeat → Minutes.
3. Use [Button D] to increase the value and [Button B] to decrease it. Holding these buttons allows for faster adjustment.
4. Press [Button D] to turn the Auto Repeat function ON or OFF.
5. After setting the start time, press [Button A] to return to the Countdown Timer Mode.

Using the Countdown Timer

• Press [Button D] in the Countdown Timer Mode to start the countdown.
• Press [Button D] again to pause the countdown.
• You can resume the countdown by pressing [Button D].
• After pausing, press [Button B] to reset the countdown to the start time.
• When the countdown reaches zero without Auto Repeat enabled, a 10-second alarm sounds, which can be stopped by pressing any button. The timer then automatically resets to the start time.

Auto Repeat

• When the countdown reaches zero with Auto Repeat enabled, the countdown restarts immediately from the preset time (this can repeat up to 9 times). You can stop this cycle by pressing [Button D] and reset the timer to the start time by pressing [Button B].

Stopwatch Mode

The Stopwatch Mode allows you to measure elapsed time, split times, and first-second place times. The maximum measuring range is 99 minutes and 59.99 seconds.

Measuring Elapsed Time

[Button D] (Start) → [Button D] (Stop) → [Button D] (Restart) → [Button D] (Stop) → [Button B] (Reset)

Measuring Split Times

[Button D] (Start) → [Button B] (Split) → [Button B] (Resume) → [Button D] (Stop) → [Button B] (Reset)

Double Finish

[Button D] (Start) → [Button B] (Split - 1st Finish) → [Button D] (2nd Finish - displays 1st finish time) → [Button B] (Cancel Split - displays 2nd finish time) → [Button B] (Reset)

Power Source

This watch is equipped with a solar rechargeable battery and a backup battery that is powered by the solar battery. If the watch is kept in the dark for extended periods, the backup battery may deplete.

Power Indicator

The display at the top shows the battery charge level:

If there is no indicator on the display, the battery is fully depleted. Place your watch in a well-lit area.

Be careful not to expose your watch to direct sunlight for extended periods, as this may cause malfunctions.

Charging the Battery

After a full charge, normal operation is maintained for approximately 11 months under the following conditions:

• The watch is not exposed to direct sunlight.
• The backlight is used for 1.5 seconds per day.
• The watch is used for 10 seconds per day with an alarm sound, and 6 hours per day in sleep mode.

Exposing the watch to sunlight daily ensures continuous battery charging:

The following table shows the approximate charging time required for the battery:

Power Saving Mode

Sleep mode helps conserve battery power when the watch is in darkness. The following table shows the availability of watch functions in sleep mode:

Turning Power Saving Mode ON/OFF

1. In the Timekeeping Mode, press and hold [Button A] until the City Code display starts flashing.
2. Press [Button C] nine times to advance to the Power Saving Mode.
3. Press [Button D] to turn the power saving mode ON or OFF.
4. After setting, press [Button A].

When the mode is ON, the display shows 'P.SAVE'. Your watch may automatically enter sleep mode. To return the watch to normal operation, place it in a well-lit area or press any button.

If the watch is in sleep mode for 60-70 minutes, the display will be off, but the alarm and analog time functions remain available. If in sleep mode for 6-7 days, the display, alarms, and hourly chime will not work, and the analog time will stop at 12 o'clock.

Technical Specifications

• Timekeeping Accuracy: ±15 seconds per month at normal temperatures.
• Timekeeping Mode: Hour, minute, second, AM/PM indicator, year, month, day, day of the week. Automatic calendar from 2000 to 2099. 12/24 hour format, DST (Daylight Saving Time).
• World Time Mode: Current time in 30 cities (29 time zones). DST (Daylight Saving Time).
• Alarm Mode: Daily alarm, hourly chime.
• Stopwatch Mode: Maximum measuring range: 99 minutes 59.99 seconds.

Product Information

• Product Name: Electronic/Electro-mechanical Quartz Wristwatch (Men's/Women's)
• Brand: CASIO
• Manufacturer: CASIO COMPUTER Co., Ltd. (6-2, Hon-machi 1-chome, Shibuya-ku, Tokyo 151-8543, Japan)
• Importer: CASIO LLC, 127055, Moscow, Sushchevskaya St., Bldg. 27, Str. 1, Russia
• Country of Manufacture: Japan
• Warranty Period: 1 Year
• Authorized Service Center Address: As specified in the warranty card.
• Compliance: Product complies with GOST 26270-98 (clause 4.35). Certificate of Conformity No. ROSS JP.AY46.D00003.
• Power Source: Solar rechargeable battery and backup battery. Model: CTL 1616.