CASIO Watch Module 2753/3333 User Manual

Battery

In your new watch, the battery is installed at the factory and should be replaced immediately when it shows signs of low power (e.g., backlight does not turn on, display is dim) by your nearest CASIO dealer or distributor.

Water Resistance

Watches are classified into ranks (I to V) according to their water resistance. Check your watch's rank using the table below for proper operation.

Notes for respective sections:

• Rank I: Not water resistant. Avoid all moisture.
• Rank II: Do not pull out the crown while the watch is wet.
• Rank III: Do not press the watch buttons underwater.
• Rank IV: If exposed to salt water, rinse thoroughly and dry.
• Rank V: Suitable for diving (excluding depths requiring helium-oxygen mixture).

Care and Maintenance

• Never attempt to open the case or remove the back cover.
• The rubber gasket that protects the watch from water and dust should be replaced every 2-3 years.
• If water enters the watch, have it checked immediately by your nearest CASIO dealer or distributor.
• Do not expose the watch to extreme temperatures.
• While the watch is designed for normal use, avoid rough handling and do not drop it.
• Do not fasten the band too tightly. A finger should fit between your wrist and the band.
• To clean the watch and band, use a dry, soft cloth or a soft cloth dampened with a water solution of mild neutral detergent. Never use volatile substances such as gasoline, solvents, aerosol sprays, etc.
• When not using your watch, store it in a dry place.
• Avoid contact with gasoline, cleaning solvents, aerosol sprays, adhesives, paints, etc. Chemical reactions caused by these materials can damage gaskets, the case, and the watch's finish.
• Some watch bands feature silk-screened designs. Be careful when cleaning such bands to avoid damaging the graphics.
• For watches with plastic bands: A whitish powdery substance may appear on the band. This substance is harmless to your skin or clothing and can be easily removed by wiping with a cloth. Exposure of the plastic band to sweat or moisture, or storage in high humidity conditions, can lead to damage, tearing, or cracking. To ensure a long service life for the plastic band, wipe it clean of dirt and water with a soft cloth whenever possible.
• For watches with fluorescent cases and bands: Strong friction of a surface with fluorescent paint against another surface can transfer the fluorescent paint to that surface. Prolonged exposure to direct sunlight can cause gradual fading of fluorescent coloring. Prolonged contact with moisture can cause gradual fading of fluorescent coloring. If any moisture gets on the watch surface, wipe it off as soon as possible. Prolonged contact with any other wet surface can cause fading of fluorescent coloring. Ensure the fluorescent surface is free of moisture and avoid contact with other surfaces.

CASIO COMPUTER CO., LTD. is not responsible for any damage incurred through the use of this watch, and accepts no claims from third parties.

General Overview of Operating Modes

The illustration shows the watch in the Current Time Mode.

Press [Button C] to cycle through modes in the following sequence: Current Time Mode → World Time Mode → Countdown Timer Mode → Stopwatch Mode → Alarm Mode → Analog Time Mode → Current Time Mode.

In any mode, press [Button L] to turn on the display backlight.

In any mode, press [Button C] to return to the Current Time Mode.

Current Time Mode

Note that the time displayed is synchronized with the analog time.

Setting Time and Date

1. In Current Time Mode, press [Button A]. The seconds display will flash.
2. Press [Button C] to cycle through the following settings: City Code → Daylight Saving Time (DST) → 12/24 Hour Format → Seconds → Hours → Minutes → Year → Month → Day → Power Saving Mode → City Code.
3. If you are adjusting 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 reset to 00 and the minutes will increment by one. If the seconds are between 00 and 29, the minutes will not change.
4. To adjust minutes, etc., use [Button D] to increase and [Button B] to decrease the value. Holding a button down allows you to change the value at a faster speed.
5. To switch between 12-hour and 24-hour formats, press [Button D] in Current Time Mode. In the 12-hour format, 'P' indicates PM.
6. Press [Button D] to turn Daylight Saving Time (DST) ON or OFF.
7. Press [Button B] and [Button D] to select the City Code.
8. Press [Button D] to turn Power Saving Mode ON or OFF.

Holding a button down allows you to change values at a faster speed.

The day of the week is set automatically according to the date.

You can set the year from 2000 to 2099.

9. After setting the date and time, press [Button A] to return to Current Time Mode.

If you do not press any buttons for a while, the watch will automatically return to Current Time Mode.

Backlight

Press [Button L] in any mode to illuminate the display for two seconds. The backlight uses EL elements; their brightness decreases after prolonged use. The watch emits an audible signal during illumination; this is normal operation. 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 two seconds in Current Time Mode. Auto-backlight activates automatically when your hand is tilted approximately 40° from horizontal. Do not use auto-backlight in situations where it could be hazardous or distracting, such as when riding a motorcycle or bicycle.

Analog Time Mode

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

1. In Analog Time Mode, press and hold [Button A] until the time digits flash.
2. Use [Button D] and [Button B] to set the current time. Pressing [Button D] advances the time by 20 seconds. Holding [Button D] while pressing [Button B] allows for faster adjustment. Press any button to stop the fast adjustment.
3. When setting is complete, press [Button A].

To return to Current Time Mode, press [Button C].

World Time Mode

You can view the local time in any of 30 cities (29 time zones) in this mode.

To view time in another time zone: In World Time Mode, press [Button D] and [Button B] to select the city whose time you want to view. Pressing [Button A] allows you to view the city name and the current time being displayed.

To set Daylight Saving Time (DST): In World Time Mode, press [Button D] and [Button B] to select the city whose DST you want to set. Press and hold [Button A] to turn DST ON or OFF.

Alarm Mode

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

Setting an Alarm:

1. In Alarm Mode, press [Button D] to select the alarm type in the following sequence: AL1 → AL2 → AL3 → AL4 → AL5 → 00 (Hourly Chime) → AL1.
2. After selecting the 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: Hours → Minutes → Hours.
4. Use [Button D] to increase and [Button B] to decrease the selected value. Holding a button down allows you to change the value at a faster speed.
5. The format (12-hour or 24-hour) matches the format selected for the current time. When using the 12-hour format, be careful to set the time correctly for AM or PM.
6. When setting is complete, press [Button A] to return to Alarm Mode.

Checking Alarm Sound: In Alarm Mode, press [Button B] to check the alarm sound.

Turning Alarms ON/OFF:

1. In Alarm Mode, press [Button D] to select the alarm type.
2. Press [Button B] to turn the selected alarm ON or OFF.

If any of the 4 alarms are selected, "AL" will appear on the display. If the hourly chime is selected, "SIG" will appear on the display.

Countdown Timer Mode

The countdown timer can be set for a duration of 1 to 60 minutes. When the countdown reaches zero, an alarm sounds.

Setting the Timer Start Time:

1. In 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 or [Button B] to decrease the selected value. Holding these buttons down allows you to change the values at a faster speed.
4. Press [Button D] to turn the Auto-Repeat function ON or OFF.
5. After setting the timer start time, press [Button A] to return to Timer Mode.

Using the Timer:

• Press [Button D] in Timer Mode to start the countdown.
• Press [Button D] again to stop the countdown.
• You can resume the countdown by pressing [Button D].
• After stopping the countdown, you can press [Button B] to reset the countdown time to the start value.
• When the countdown reaches zero with Auto-Repeat OFF, a 10-second alarm sounds, which can be stopped by pressing any button. The timer then automatically returns to the start time.

Auto-Repeat: When the countdown reaches zero with Auto-Repeat ON, the countdown restarts immediately from the previously set value (this can repeat up to 9 times). You can stop this countdown by pressing [Button D] and forcibly reset the timer to the start value by pressing [Button B].

Stopwatch Mode

The Stopwatch Mode allows you to record elapsed time, split times, and dual finishes. The measurement range for elapsed time is limited to 99 minutes and 59.99 seconds.

a) Measuring individual lap times:

[Button D] (Start) – [Button D] (Stop) – [Button D] (Lap) – [Button D] (Stop) – [Button B] (Reset)

b) Measuring elapsed time with intermediate results:

[Button D] (Start) – [Button B] (Intermediate Result) – [Button B] (Continue) – [Button D] (Stop) – [Button B] (Reset)

c) Dual finish:

[Button D] (Start) – [Button B] (Split, 1st finish) – [Button D] (2nd finish; the result of the 1st finish is displayed) - [Button B] (Cancel split; the result of the 2nd finish is displayed) – [Button B] (Reset)

Power Source (Solar Battery)

This watch is equipped with a solar rechargeable battery and a backup battery that is powered by the solar battery. If your watch is left in darkness for an extended period, the backup battery charge will decrease.

Power Indicator

The battery charge level indicator is located at the top of the display.

• If there is no indicator on the display, the battery is fully discharged. Place your watch in a well-lit area.
• Be careful not to place your watch in 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:

• Watch is not exposed to direct sunlight.
• Backlight is used for 1.5 seconds per day.
• Alarm is used for 10 seconds per day.
• The watch operates for 18 hours and is in standby mode for 6 hours daily.

The following table shows the approximate time required to charge the battery:

Power Saving Mode

Power saving mode conserves battery charge when the watch is in darkness. The following table shows the availability of watch functions when in power saving mode:

Turning Power Saving Mode ON/OFF

1. In Current Time Mode, press and hold [Button A] until the City Code flashes.
2. Press [Button C] nine times to enter Power Saving Mode.
3. Press [Button D] to turn Power Saving Mode ON or OFF.
4. When settings are complete, press [Button A].

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

If the watch is in power saving mode for 60-70 minutes, the display will be off, but the alarm and analog time functions remain available. If the watch is in power saving mode for 6-7 days, the display, alarms, and analog time (which stops at 12:00) will not function.