Introduction
This manual provides detailed instructions for the Citizen Eco-Drive Tsuki-yomi A-T Red Dial Super Titanium Bracelet Watch (Model BY1018-55X). This timepiece combines advanced atomic timekeeping with a unique moon phase display, powered by Citizen's Eco-Drive technology. Please read this manual thoroughly to understand the full capabilities and proper operation of your watch.
Product Overview
Front view of the Citizen Eco-Drive Tsuki-yomi A-T watch, showcasing its distinctive red dial, moon phase indicator at 6 o'clock, and Super Titanium bracelet.
Side profile of the watch, highlighting the slim case design and the arrangement of the crown and function pushers.
Rear view of the watch, displaying the engraved case back with model information, water resistance, and radio control details.
Setup
Initial Charge
Your Citizen Eco-Drive watch is powered by light. Before first use, ensure the watch is fully charged by exposing the dial to bright light (natural sunlight is ideal) for several hours. A low charge indicator may be present if the watch has been stored in darkness.
Time Zone Setting
The watch features world time in 24 time zones. To set your local time zone:
- Pull the crown out to the time setting position.
- Rotate the crown to select your desired city/time zone. The hands will adjust accordingly.
- Push the crown back in to finalize the setting.
Receiving Atomic Time Signal
This watch is equipped with atomic timekeeping (Radio Control) for precise accuracy. The watch attempts to receive the time signal automatically, typically overnight. For manual reception:
- Ensure the watch is in an open area, away from electronic interference.
- Refer to the specific button combination in the detailed operational guide (usually available online or via QR code) to initiate manual signal reception.
- The watch will indicate successful reception (e.g., second hand moving to 'RX' or 'OK').
Operating Your Watch
Basic Timekeeping
The watch displays hours, minutes, and seconds. The perpetual calendar automatically adjusts for month length and leap years.
Moon Phase Display
A dedicated window at 6 o'clock displays the current moon phase. This feature is automatically synchronized with the date and time settings.
Day-Date Functionality
The watch includes a day and date display, which is part of the perpetual calendar system and updates automatically.
Water Resistance
The watch is water resistant up to 100 meters (WR100/10Bar/333ft), suitable for swimming, showering, and snorkeling. It is not intended for scuba diving.
Maintenance
Charging the Eco-Drive
To maintain optimal performance, regularly expose your watch to light. Avoid prolonged storage in dark places. The watch has a power reserve indicator to show charge level.
- Sunlight: Best source for charging.
- Indoor Lighting: Can charge, but takes significantly longer.
Cleaning
Wipe the watch case and bracelet with a soft, dry cloth. For stubborn dirt, a slightly damp cloth can be used, followed by drying. Avoid harsh chemicals or abrasive materials.
Storage
When not in use, store the watch in a location where it can receive some light to maintain its charge. Avoid extreme temperatures or strong magnetic fields.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Watch stops or hands do not move. | Insufficient charge. | Expose the watch to bright light for several hours to fully charge. |
| Time is inaccurate. | Failed atomic time signal reception or incorrect time zone setting. | Ensure watch is in an area with good signal reception. Manually initiate signal reception. Verify time zone setting. |
| Moon phase display is incorrect. | Date or time not set correctly. | Ensure the watch's date and time are accurately set, as the moon phase is linked to these. |
If issues persist, please contact Citizen customer support or an authorized service center.
Specifications
- Model Number: BY1018-55X (Caliber H874)
- Case Material: Super Titanium
- Case Diameter: 43mm
- Dial Color: Red
- Crystal: Sapphire
- Movement: Eco-Drive (Light-Powered)
- Features: Atomic Timekeeping (Radio Control), Moon Phase Display, World Time (24 Time Zones), Perpetual Calendar, Day-Date
- Bracelet Material: Super Titanium
- Clasp Type: Fold Over Clasp with Push Buttons
- Water Resistance: 100 meters (WR100/10Bar/333ft)
Warranty and Support
For warranty information and customer support, please refer to the official Citizen website or the warranty card included with your purchase. You can also visit the Citizen Store on Amazon for additional resources.
Regular servicing by an authorized Citizen service center is recommended to ensure the longevity and optimal performance of your watch.
