CASIO Module No. 5434/5451/5490

Battery

The battery installed at the factory may discharge during shipping and storage. If the display becomes dim, replace the battery at a CASIO authorized service center or a CASIO distributor.

Water Resistance

For all categories of watches, the following are prohibited:

• Pressing buttons underwater.
• Setting hands underwater.
• Unscrewing the crown underwater.

If the watch is exposed to saltwater, rinse it thoroughly with fresh water and dry it. Do not wear watches with leather straps while swimming. Avoid prolonged contact of leather straps with water.

Water Resistance Categories

Watches are classified into categories (I to V) according to their degree of water resistance. Consult the table below to determine the correct usage for your watch.

Notes:
I: Watches are not water resistant. Avoid all moisture.

Water Resistance Definitions

II WR (Water Resistant): Indicates water resistance according to ISO 2281. Brief contact with water will not cause problems.

III Water resistance to 5 Bar (50 meters): The watch can withstand water pressure of the specified level and can be used while showering and for brief swimming.

IV Water resistance to 10 Bar (100 meters): The watch can be used for regular swimming and snorkeling.

V Water resistance to 20 Bar (200 meters): The watch can be used for scuba diving (excluding depths requiring a helium-oxygen mixture).

Caring for Your Watch

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

General Care and Precautions

• Do not expose the watch to extreme temperatures.
• Although designed for active daily use, wear the watch carefully and avoid drops.
• Do not fasten the strap too tightly. You should be able to fit a finger between your wrist and the strap.
• To clean the watch and strap, use a dry soft cloth, or a soft cloth dampened with a mild neutral detergent solution. Never use volatile substances such as gasoline, solvents, or spray cleaners.
• When not using your watch, store it in a dry place.
• Avoid contact with gasoline, cleaning solvents, aerosol sprays, adhesives, paint, etc. Chemical reactions from these materials can damage gaskets, the case, and the watch's polish.
• Some models feature silk-screened designs on the strap. Be careful when cleaning these straps to avoid damaging the prints.

For Watches with Plastic Straps

• You may notice a white powdery substance on the strap. This substance is harmless to your skin or clothing and can be easily removed by wiping with a cloth.
• Exposure of plastic straps to sweat or moisture, or storage in high humidity, can lead to damage, tearing, or cracking. To ensure a long service life for the plastic strap, wipe it clean of dirt and water with a soft cloth at the earliest opportunity.

For Watches with Fluorescent Cases and Straps

• Prolonged exposure to direct sunlight can cause the fluorescent color to gradually fade.
• Prolonged contact with moisture can cause the fluorescent color to gradually disappear. If any moisture gets on the watch surface, wipe it off as soon as possible.
• Prolonged contact with any other wet surface can cause the fluorescent color to discolor. Ensure that moisture is removed from the fluorescent surface and avoid contact with other surfaces.
• Strong friction of a surface with fluorescent paint against another surface can transfer the fluorescent paint to that surface.

Condensation

Slight condensation may form on the inside of the glass in conditions of rapid temperature changes. This phenomenon is due to the laws of physics and is not a defect.

Disclaimer

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

Model Variations

Watches may differ slightly from the illustrations in this manual. Some models use hands and rotating discs to display information. In this manual, the term "hands" refers to both analog hands and rotating discs.

Watch Face Diagrams

Module 5434

Diagram Description: The watch face shows hour, minute, and second hands. A sub-dial indicates the stopwatch seconds (up to 60). Another sub-dial indicates the stopwatch minutes (up to 30). A 24-hour indicator is also present. A date window is located at the 3 o'clock position. Buttons A and B are located on the side.

Module 5451

Diagram Description: The watch face shows hour, minute, and second hands. A sub-dial indicates the stopwatch seconds (up to 60). Another sub-dial indicates the stopwatch minutes (up to 30). A 24-hour indicator is also present. A date window is located at the 3 o'clock position. Buttons A and B are located on the side. The crown is shown with positions for 1 click and 2 clicks.

Module 5490

Diagram Description: The watch face shows hour, minute, and second hands. A sub-dial indicates the stopwatch seconds (up to 60). Another sub-dial indicates the stopwatch minutes (up to 10). A 24-hour indicator is also present. A date window is located at the 3 o'clock position. Buttons A and B are located on the side.

Module 5541

Diagram Description: The watch face shows hour, minute, and second hands. A sub-dial indicates the stopwatch seconds (up to 60). Another sub-dial indicates the stopwatch minutes (up to 30). A 24-hour indicator is also present. A date window is located at the 3 o'clock position. Buttons A and B are located on the side. The crown is shown with positions for 1 click and 2 clicks.

Setting the Current Time

1. When the second hand is at the 12 o'clock position, pull the crown out to the 2nd click.
2. Set the current time by turning the crown.
3. Return the crown to its original position.

Note:

• When setting the current time, consider the AM and PM times.
• Before finishing, move the minute hand 4-5 minutes past the desired time, then set the exact time.

Setting the Date

1. Pull the crown out to the 1st click.
2. Set the date by turning the crown.
3. Return the crown to its original position.

Note:

• The date indicator changes up to 31. For months with fewer than 31 days, the date must be adjusted manually.
• To ensure the date changes correctly at midnight, do not set the date between 9:00 PM and 1:00 AM.

Crown Operations

Some models with 100m or 200m water resistance have a screw-in crown. Before operating the crown, unscrew it to unlock (turn towards you), then pull it out. Do not use excessive force when pulling the crown. The watch is not water resistant when the crown is unscrewed. After performing the necessary operations, return the crown to its original position and screw it back in to lock.

Diagram Description: A watch crown is shown. An arrow indicates unscrewing the crown (turning it towards the viewer) for unlocking.

If Your Watch Has a Rotating Bezel...

Turn the bezel until the marker aligns with the minute hand. After some time, you can tell how much time has passed since you aligned the marker with the minute hand.

Diagram Description: A watch bezel is shown with markings. An arrow points to the "Start" position (aligned with the minute hand). Another arrow indicates "Elapsed Time" measured by the bezel. The "Current Time" is also indicated.

Using the Stopwatch

The stopwatch can measure elapsed time in 1-second intervals. The measurement range is limited to 29 minutes 59 seconds (for modules 5434, 5451, 5541) or 9 minutes 59 seconds (for module 5490).

Measuring Lap Times

Diagram Description: A sequence of arrows shows operations: Start → Stop → Repeat Start → Stop → Reset.

Measuring Split Times

Diagram Description: A sequence of arrows shows operations: Start → Split → Cancel Split → Stop → Reset.

Displaying Split and Finish Results

Diagram Description: A sequence of arrows shows operations: Start → Split (displays 1st athlete's time) → Cancel Split (displays 2nd athlete's time) → Stop → Reset.

Important Notes on Stopwatch Use

Warning: Do not use the stopwatch when the crown is pulled out.

Note: Stopwatch measurement will automatically stop after 30 minutes (for modules 5434, 5451, 5541) or 10 minutes (for module 5490) from the start of measurement.

Stopwatch Hand Correction

If the stopwatch hands do not return to the zero position after resetting, follow this procedure:

1. Pull the crown out to the 2nd click.
2. Use Button A (clockwise) or Button B (counter-clockwise) to move the stopwatch second and minute hands to the zero position.
   • Hold down a button for accelerated movement of the second hand. Accelerated movement stops when the button is released.
   • The stopwatch minute hand moves in synchronization with the stopwatch second hand.
3. After completing all correction operations, return the crown to its original position.

Warning: Current time measurement stops when the crown is pulled out. Correct the current time after completing the stopwatch hand correction.

Technical Specifications

• Accuracy at normal temperature: ±20 seconds per month
• Stopwatch:
  • Unit of measurement: 1 second
  • Measurement limits:
    • (for modules 5434, 5451, 5541) 29' 59" (30 minutes)
    • (for module 5490) 9' 59" (10 minutes)
  • Measurement modes: Elapsed time, split time, two finishes

Power Source

• Power: One silver oxide battery (SR920SW)
• Approximate battery life: 3 years under the following conditions: stopwatch used for 30 minutes per day.

Technical specifications are subject to change without prior notice.

Product Information

Name: Electronic / Electro-mechanical quartz wristwatches (men/women)

Brand: CASIO

Manufacturer: CASIO COMPUTER Co.,Ltd.

Manufacturer Address: 1-6-2, Hon-machi 1-chome, Shibuya-ku, Tokyo 151-8543, Japan

Importer: OOO "Casio", 127015, Russia, Moscow, ul. Butyrskaya, d. 77

Warranty Period: 2 years

Address for warranty claims: Indicated on the warranty card.