Casio G-Shock GD-400-1B2CR Men's Digital Quartz Sport Watch Instruction Manual

Introduction

This manual provides detailed instructions for the proper setup, operation, and maintenance of your Casio G-Shock GD-400-1B2CR Digital Quartz Sport Watch. Designed for durability and functionality, this timepiece features shock resistance, 200-meter water resistance, an Auto Super Illuminator LED with Flash Alert, World Time, five daily alarms, and a 1/100th second stopwatch. Please read this manual thoroughly to ensure optimal performance and longevity of your watch.

Setup

Your G-Shock watch comes with a pre-installed Lithium Metal battery. Upon first use, or after a battery change, you may need to set the current time and date.

Setting Time and Date

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

Image: Front view of the Casio G-Shock GD-400-1B2CR watch, displaying its digital interface and robust design.

Operating Instructions

Navigating Modes

Press the MODE button to cycle through the watch's various functions:

• Timekeeping Mode: Displays the current time and date.
• World Time Mode: Shows the current time in various cities around the globe.
• Stopwatch Mode: Measures elapsed time with 1/100th second accuracy.
• Countdown Timer Mode: Allows setting a countdown from a specified time.
• Alarm Mode: Set up to five independent daily alarms.

World Time Function

In World Time Mode, use the REVERSE and FORWARD buttons to scroll through different city codes and view their current times.

Using the Stopwatch

In Stopwatch Mode:

• Press the START/STOP button to start and stop the stopwatch.
• Press the ADJUST button to reset the stopwatch to zero.
• The watch supports split time measurements.

Setting Alarms

In Alarm Mode:

• Use the REVERSE and FORWARD buttons to select one of the five alarms (AL1 to AL5) or the Hourly Time Signal (SIG).
• Press and hold the ADJUST button until the alarm time starts to flash.
• Use the MODE button to move between hour and minute settings.
• Use the REVERSE and FORWARD buttons to adjust the flashing value.
• Press the ADJUST button to confirm and exit.

Super Illuminator LED and Flash Alert

Press the LIGHT button to illuminate the display. The Auto Super Illuminator feature can be enabled to automatically light up the display when the watch is tilted towards your face. The Flash Alert function causes the backlight to flash for alarms, hourly time signals, and countdown timer alerts.

Mute Function

The watch features a mute function to silence button operation tones. To activate or deactivate, refer to the detailed instructions in the full Casio module manual.

Image: The Casio G-Shock GD-400-1B2CR watch displayed on a wrist, showcasing its size and fit.

Maintenance

Water Resistance

Your watch is water resistant to 200 meters (660 feet). This rating makes it suitable for professional marine activity and serious surface water sports. However, it is not suitable for diving. Avoid operating buttons while the watch is wet or submerged to prevent water ingress.

Cleaning

To maintain the appearance and functionality of your watch, regularly wipe it with a soft, dry cloth. For stubborn dirt, especially on the resin band and case, use a mild soap solution and a soft brush, then rinse thoroughly with fresh water and dry completely. Avoid using harsh chemicals or solvents.

Battery Replacement

The watch uses one Lithium Metal battery. When the battery power is low, the display may dim or functions may become unreliable. Battery replacement should be performed by a qualified watch technician or an authorized Casio service center to ensure proper sealing and water resistance.

Troubleshooting

• Blank Display: Check if the battery is depleted. If so, replace the battery.
• Incorrect Time: Re-enter the Timekeeping Mode and adjust the time and date settings as described in the Setup section. Ensure the correct city code and DST setting are selected.
• Buttons Unresponsive: Ensure the watch is not in a locked mode (if applicable, refer to the full module manual). If the issue persists, a battery reset or professional inspection may be required.
• Water Inside Display: If condensation or water appears inside the watch, cease use immediately and take it to an authorized service center. This indicates a breach in water resistance.

Specifications

Warranty and Support

For warranty information, service, or additional support, please refer to the official Casio website or contact Casio customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.