Casio Module No. 3125 LDF-30 Watch User Manual

General Precautions

• Avoid exposing the watch to extreme temperatures.
• Avoid rough handling and dropping the watch.
• Do not wear the strap too tightly; ensure a finger can fit between the strap and your wrist.
• Clean the watch and strap using a dry soft cloth, or a soft cloth dampened with a mild neutral detergent solution. Never use volatile agents such as gasoline, solvents, spray cleaners, etc.
• Store the watch in a dry place when not in use.
• Avoid contact with gasoline, cleaning solvents, spray aerosols, adhesives, paint, etc. Chemical reactions caused by these materials can damage gaskets, the case, and the watch's finish.
• Some models have silk-screened designs on their straps. Be careful when cleaning these straps to avoid damaging the designs.

Battery

The battery installed at the factory discharges during shipping and storage. If you notice signs of insufficient power (dim display), replace the battery at your nearest authorized CASIO service center or CASIO distributor.

Water Resistance

Watches are classified by water resistance rating (from I to V) according to the degree of protection against water. Check your watch's rating to determine its proper use.

Notes:

• Rating I: Not water resistant. Avoid all moisture.
• Rating II (WR): Water resistant according to ISO 2281. Brief contact with water is acceptable.
• Rating III (50 meters): Can withstand water pressure indicated. Suitable for showering and brief swimming.
• Rating IV (100 meters): Suitable for regular swimming and snorkeling.
• Rating V (200 meters): Suitable for scuba diving (excluding depths requiring helium-oxygen mixture).

General Water Resistance Rules:

• Never press buttons underwater.
• Never set hands underwater.
• Never unscrew the crown underwater.
• If exposed to salt water, rinse thoroughly with fresh water and dry.
• Do not wear a watch with a leather strap while swimming. Avoid prolonged contact of leather straps with water.

Care for Your Watch

• Never attempt to open the case or remove the back cover yourself.
• The gasket, which protects the watch from water and dust, should be replaced every 2-3 years.
• If moisture enters the watch, have it checked immediately by your dealer or a CASIO distributor.

Plastic Straps

A white powdery substance may appear on plastic straps. This substance is harmless and can be easily removed by wiping with a cloth. Sweat or moisture, or storing the strap in high humidity conditions, can lead to damage, tearing, or cracking. To ensure a long life for your plastic strap, wipe it clean of dirt and water with a soft cloth whenever possible.

Fluorescent Cases and Straps

Prolonged exposure to direct sunlight can cause gradual fading of fluorescent colors. Prolonged contact with moisture can also cause gradual fading. If any moisture gets on the watch surface, wipe it off as soon as possible. Prolonged contact with any other wet surface may cause discoloration of the fluorescent color. Ensure the fluorescent surface is dry and avoid contact with other surfaces.

Condensation

Slight condensation may form on the inside of the glass when exposed to sudden temperature changes. This is a normal phenomenon due to the laws of physics and is not a defect.

Disclaimer

CASIO COMPUTER CO., LTD. is not responsible for any damage that may occur from the use of this product, nor does it accept any claims from third parties.

Setting the Time and Date

1. In the Current Time Mode, press and hold button "A" until the seconds display starts flashing, indicating the start of setting operations.
2. Press button "B" to cycle through the settings in the following sequence: Seconds → Hours → Minutes → Year → Month → Day → Seconds.
3. If the seconds are flashing (selected for adjustment), press button "C" to reset the seconds to 00. If you press "C" when the seconds are between 30 and 59, the seconds will 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. Press button "C" to increase the values for minutes, hours, etc. Holding down a button allows values to be changed at a higher speed.
5. The day of the week is set automatically in accordance with the date.
6. You can set the year in the range from 2000 to 2099.
7. When you have finished setting the time and date, press button "A" to exit the setting mode.

12/24 Hour Format

Press button "C" in the Current Time Mode to toggle between the 12-hour and 24-hour time formats. ?

In the 12-hour format, "P" indicates PM (after noon).

Adjusting Backlight Duration

In the Current Time Mode, press and hold button "C" for a few seconds to switch the backlight duration between 1.5 seconds and 3 seconds.

Setting the Alarm Time

1. In the Alarm Mode, press and hold button "A" for 3 seconds until the hour digits start flashing, indicating the start of setting operations. The alarm will automatically turn on at this point.
2. Press button "B" to cycle through the settings: Hours → Minutes.
3. Press button "C" to adjust the selected value.
4. When you have finished setting the alarm time, press button "A" to exit.

Testing the Alarm

Press button "C" in the Alarm Mode to test the alarm sound. ▶️

Turning Alarm and Hourly Chime On/Off

In the Alarm Mode, press button "C" to cycle through the following settings:

• All On (Alarm and Hourly Chime enabled) ✔️
• All Off (Alarm and Hourly Chime disabled) ❌
• Alarm Only (Only the daily alarm is enabled) ?
• Hourly Chime Only (Only the hourly chime is enabled) ⏰

Stopwatch Measurement Operations

Elapsed Time Measurement:

• C (Start) → C (Stop) → A (Reset)

Split Time Measurement:

• C (Start) → A (Split Time) → A (Resume Split) → C (Stop) → A (Reset)

Dual Finish Measurement:

• C (Start) → A (Split/First Finish - displays first finish time) → C (Stop - second watch stops, displays second finish time) → A (Clear Split - displays total elapsed time) → A (Reset)

Setting the Dual Time

1. In the Dual Time Mode, press and hold button "A" for 3 seconds. The hour digits will flash, indicating the start of setting operations. The alarm will automatically turn on at this point.
2. Press button "B" to cycle through the settings: Hours → Minutes.
3. Press button "C" to adjust the selected value.
4. When you have finished setting the dual time, press button "A" to exit.