Instruction Manual

Introduction

The Casio GA-100L-1A G-Shock watch is an anti-magnetic analog-digital combination timepiece designed for durability and functionality. It features a shock-resistant construction that protects against impact and vibration, along with 200-meter water resistance. The watch incorporates a unique bi-color molding with different colors for the inner and outer surfaces, where the inside surface coloring is visible from the sides of the band and through the band holes, highlighting its military motif reminiscent of a flight jacket lining. This manual provides detailed instructions for setting up, operating, maintaining, and troubleshooting your watch.

Figure 1: Front view of the Casio GA-100L-1A G-Shock watch, showcasing its black case and band with subtle green accents, analog hands, and digital displays.

Setup

Before using your watch, ensure the correct time and date are set. The watch is powered by a Lithium Metal battery (included).

Setting Time and Date:

1. In Timekeeping Mode, press and hold the ADJUST button (top-left) until the city code starts to flash. This indicates the setting mode.
2. Use the FORWARD (top-right) and REVERSE (bottom-right) buttons to select your desired Home Time city code.
3. Press the MODE button (bottom-left) to cycle through the settings: DST (Daylight Saving Time), 12/24-hour format, Seconds, Hour, Minute, Year, Month, Day.
4. Use the FORWARD and REVERSE buttons to adjust the flashing value.
5. Once all settings are correct, press the ADJUST button to exit the setting mode. The analog hands will automatically adjust to the set digital time.

Operating Instructions

Your G-Shock watch offers multiple modes for various functions. Press the MODE button (bottom-left) to navigate between modes.

Timekeeping Mode:

• Displays the current time (analog and digital), day of the week, and date.
• Press the LIGHT button (top-right) to illuminate the display for low-light conditions.

Stopwatch Mode:

• The stopwatch measures elapsed time in 1/1000th second increments.
• To start/stop the stopwatch, press the START-STOP button (bottom-right).
• To record a split time, press the SPLIT-RESET button (bottom-left) while the stopwatch is running. Press again to release the split.
• To reset the stopwatch, ensure it is stopped, then press the SPLIT-RESET button.
• Speed Indicator: This watch features a unique speed indicator. After measuring elapsed time over a specified distance (e.g., 1 km or 1 mile), the watch calculates and displays the average speed. The digital displays and the sub-dial (90 km/h indicator) will show the calculated speed. Speeds exceeding 999 units will be indicated by "OVER".

World Time Mode:

• Displays the current time in 48 cities (29 time zones) around the world.
• Use the FORWARD and REVERSE buttons to scroll through different city codes.

Alarm Mode:

• The watch has 5 daily alarms and one snooze alarm.
• Use the FORWARD and REVERSE buttons to select an alarm number (AL1 to AL5, SNZ).
• Press the ADJUST button to enter alarm setting mode. Use MODE to switch between hour and minute settings, and FORWARD/REVERSE to adjust values.
• Press ADJUST to confirm.
• Press START-STOP to toggle an alarm ON/OFF.

Countdown Timer Mode:

• Set a countdown time from 1 minute to 24 hours.
• Press ADJUST to enter setting mode. Use MODE to switch between hour and minute settings, and FORWARD/REVERSE to adjust values.
• Press ADJUST to confirm.
• Press START-STOP to start or stop the countdown.

Maintenance

Proper care ensures the longevity and performance of your G-Shock watch.

• Cleaning: Wipe the watch regularly with a soft, dry cloth. For stubborn dirt, use a mild soap solution and rinse thoroughly under running water, ensuring all buttons are pressed and released while submerged to clear debris. Dry completely.
• Water Resistance: The watch is rated for 200-meter water resistance. Do not operate buttons underwater. After exposure to saltwater, rinse the watch with fresh water and dry it thoroughly.
• Temperature Exposure: Avoid exposing the watch to extreme temperatures (above 60°C / 140°F or below -10°C / 14°F) for extended periods.
• Chemicals: Avoid contact with gasoline, cleaning solvents, aerosols, adhesives, paints, etc. These can cause discoloration or damage to the resin case and band.
• Battery Replacement: The battery life is approximately 2 years. When the display becomes dim or functions become erratic, it's time for a battery replacement. It is recommended to have the battery replaced by an authorized Casio service center to ensure water resistance is maintained.

Troubleshooting

If you encounter issues with your watch, refer to the following common solutions:

• Hands Not Aligning with Digital Time: This can occur due to strong magnetic fields or impact. Perform a hand home position correction. Refer to the full user manual (Module No. 5146) for detailed steps on adjusting hand alignment.
• Digital Display is Blank or Dim: The battery may be low. Replace the battery as soon as possible.
• Buttons Are Stiff or Unresponsive: The watch may have accumulated dirt or debris around the buttons. Rinse the watch under fresh water while pressing the buttons to clear any obstructions. If the issue persists, seek professional service.
• Watch Stops or Time is Incorrect: This could indicate a low battery or a need for a full reset. If a new battery doesn't resolve the issue, a full reset (AC Reset) might be necessary. Consult an authorized service center for this procedure.

Specifications

Warranty and Support

Casio watches typically come with a manufacturer's warranty covering defects in materials and workmanship. For specific warranty terms and conditions, please refer to the warranty card included with your purchase or visit the official Casio website. For technical support, repairs, or further assistance, please contact Casio customer service or an authorized service center. You can find contact information and service center locations on the official Casio website: www.casio.com.