Citizen Eco-Drive technology powers watches with any light source, eliminating battery replacements and offering reliable timekeeping. These solar-powered watches are environmentally conscious.
What is Eco-Drive Technology?
Citizen’s innovative Eco-Drive technology represents a significant advancement in watchmaking. Unlike traditional quartz watches relying on batteries, Eco-Drive watches harness the power of light – both natural and artificial – to generate energy. This light is converted into electrical energy, which is then stored in a rechargeable battery.
Crucially, this rechargeable battery is mercury-free and environmentally friendly. When fully charged, an Eco-Drive watch can operate for an extended period, approximately seven months, without any light exposure. This self-powered system eliminates the need for frequent battery changes, offering convenience and sustainability.
Benefits of Eco-Drive
Citizen Eco-Drive watches offer numerous advantages for the discerning watch owner. The primary benefit is the elimination of battery replacements, saving both time and money, and reducing environmental waste. The self-charging nature ensures consistent and reliable timekeeping, powered by any light source – sunlight, indoor lighting, even dim environments.
Furthermore, Eco-Drive technology is incredibly durable and accurate. These watches are often equipped with advanced features like perpetual calendars and atomic timekeeping, enhancing functionality. Choosing Eco-Drive means selecting a sustainable, high-performance timepiece.

Understanding Your Watch Model
Identifying your specific Citizen Eco-Drive model number is crucial for accessing the correct instruction manual and troubleshooting guidance online.
Identifying Your Specific Model Number
Locating your Citizen Eco-Drive watch’s model number is the first step towards understanding its features and accessing the appropriate support materials. The model number is typically found on the watch case back. Look closely – it’s often a combination of letters and numbers.
This unique identifier is essential when downloading the correct PDF instruction manual from the Citizen website. Knowing your model ensures you have access to specific instructions tailored to your watch’s functions, including setting the time, date, and utilizing advanced features like world time or atomic timekeeping. Without the correct model number, you risk using a manual designed for a different watch, potentially leading to confusion or incorrect operation.
Locating the Instruction Manual (PDF Download)
Once you’ve identified your Citizen Eco-Drive model number, obtaining the instruction manual is straightforward. Visit the official Citizen Watch website and navigate to their support or manuals section. Enter your specific model number into the search bar. A list of relevant PDF documents should appear, allowing you to download the correct manual for your watch.
These manuals provide detailed instructions on all aspects of your watch, from basic operation and charging to troubleshooting common issues. Having the PDF readily available allows for easy access to information whenever you need it, ensuring you can fully utilize and maintain your Eco-Drive timepiece.

Basic Operation
Citizen Eco-Drive watches utilize the crown and pushers to adjust time and date settings, offering a user-friendly experience for everyday wear and precision.
Setting the Time
To set the time on your Citizen Eco-Drive watch, gently pull the crown out to the first click. This allows you to adjust the hour and minute hands. Rotate the crown to move the hands to the correct time. Ensure you observe the AM/PM indicator if your watch features one.
For precise setting, synchronize with a known accurate time source. Once the correct time is displayed, push the crown back to its original position. Be careful not to pull the crown out while the watch is submerged in water, as this could compromise its water resistance. Always double-check the time after setting to confirm accuracy.
Setting the Date
To set the date on your Citizen Eco-Drive, pull the crown out to the second click – typically after adjusting for time. Rotate the crown to advance the date to the correct day of the month. Some models may also allow adjustment of the day of the week, which will automatically update with the date.
Be mindful of AM/PM when setting the date near the end of the month. After setting the correct date, gently push the crown back to its original position. Avoid quick date changes during the hours of 9 PM to 1 AM, as this could potentially damage the date mechanism.
Using the Crown and Pushers
The crown on your Citizen Eco-Drive controls primary functions like time and date setting. Pulling it to different positions unlocks various adjustments. Pushers, typically small buttons on the watch case, often control secondary features like the world time or stopwatch.
Generally, the first click of the crown adjusts the date, the second adjusts the time, and pushing it back in secures the settings. Pushers may require single or multiple presses to cycle through functions. Refer to your specific model’s manual for precise instructions, as functionality varies.

Charging Your Eco-Drive Watch
Eco-Drive watches convert light into energy, storing it in a rechargeable battery – a clean, mercury-free power source for continuous operation.
How Solar Power Works in Eco-Drive
Citizen Eco-Drive watches utilize a sophisticated system to harness light energy. A solar cell, located beneath the watch dial, captures both natural and artificial light. This captured light is then converted into electrical energy, which is efficiently stored within a rechargeable battery.
Unlike traditional watches requiring periodic battery changes, Eco-Drive eliminates this need. The rechargeable battery powers the watch’s movement, ensuring accurate timekeeping. Importantly, this battery is environmentally friendly, containing no harmful substances like mercury. The amount of light needed for charging varies, but even indoor lighting can contribute to maintaining the power reserve.
Optimal Charging Conditions
To maximize your Citizen Eco-Drive watch’s performance, expose it to bright light regularly. Direct sunlight is ideal, but bright indoor lighting also works effectively. Consistent exposure ensures the rechargeable battery maintains a sufficient power reserve. Avoid prolonged periods in darkness, as this will deplete the stored energy.
While Eco-Drive watches can charge under various light conditions, fluorescent light is less efficient than natural sunlight. Regularly charging your watch, even when it’s functioning normally, will prevent it from entering a power-saving mode and ensure continuous, accurate timekeeping. Remember, consistent light exposure is key!
Checking the Power Reserve
Citizen Eco-Drive watches indicate their power reserve through the seconds hand’s behavior. If the watch is sufficiently charged, the seconds hand will move at one-second intervals. However, when the power reserve is low, the seconds hand will move in two-second intervals, signaling a need for charging.
Some models display a power reserve indicator on the dial. A fully charged watch will show a full indicator, while a low reserve will show fewer segments. Regularly monitoring the power reserve helps prevent the watch from stopping. Consistent charging, as described previously, will maintain optimal performance and accuracy.

Advanced Features
Citizen Eco-Drive watches boast features like World Time, Perpetual Calendars, and Atomic Timekeeping, offering enhanced functionality and precision beyond standard time displays.
World Time Function
Citizen Eco-Drive watches with the World Time function allow you to display the time in multiple cities simultaneously. This feature is incredibly useful for travelers or individuals who need to keep track of time zones across the globe. Typically, you’ll use the crown to select a city code representing a specific location.
The watch then displays the corresponding local time for that city. Some models allow you to cycle through numerous cities, while others may have a dedicated sub-dial for displaying world time. Refer to your specific model’s instruction manual for detailed steps on activating and navigating the World Time function, as procedures can vary.
Perpetual Calendar Function
Citizen Eco-Drive watches featuring a Perpetual Calendar automatically adjust the date, accounting for months with 30 or 31 days, leap years, and even the century change. This eliminates the need for manual date adjustments, ensuring accurate timekeeping for years to come. Activating this function usually involves specific crown operations, detailed in your watch’s manual.
The perpetual calendar intelligently calculates the correct date, minimizing user intervention. However, it’s crucial to understand that some models may require initial setting of the year. Always consult your specific model’s instructions to properly utilize and maintain the Perpetual Calendar feature.
Atomic Timekeeping (Radio Control)
Citizen Eco-Drive watches with Atomic Timekeeping automatically synchronize with radio time signals broadcast by atomic clocks. This ensures exceptional accuracy, maintaining time within a few milliseconds of the standard. To initiate synchronization, the watch needs to be in an area with sufficient signal reception – typically indoors near a window;
The process usually involves pressing a button or a sequence of button presses, as detailed in your model’s manual. Successful synchronization is indicated by the watch display. Regular synchronization maintains accuracy, but manual adjustments are possible if needed. Ensure the watch is adequately charged for optimal performance.

Troubleshooting Common Issues
If your Citizen Eco-Drive isn’t functioning, consult the manual’s troubleshooting section for solutions to problems like charging issues or time inaccuracies.
Watch Not Charging
If your Citizen Eco-Drive watch isn’t charging, ensure the dial is exposed to sufficient light – sunlight is ideal, but bright indoor light can also work. Check if the watch has been exposed to prolonged darkness, as it may require extended charging.
Refer to your model’s manual for specific charging times. A fully discharged watch may take significantly longer to regain a reserve. Confirm the charging indicator (if present) isn’t displaying an error. If problems persist, consult the troubleshooting section of the PDF manual for further assistance, as it details potential issues and solutions related to power conversion and battery functionality.
Watch Losing Time
If your Citizen Eco-Drive watch is losing time, it likely indicates insufficient charge in the rechargeable battery. While Eco-Drive watches are designed for continuous operation with adequate light exposure, prolonged darkness or insufficient light can lead to a depleted power reserve.
Check the power reserve indicator (if your model has one). Refer to your watch’s instruction manual (available as a PDF download) for details on interpreting the indicator. Ensure the watch is being exposed to sufficient light to maintain its charge. If the issue continues, consult the troubleshooting section of the manual for specific guidance.
Resetting the Watch
Citizen Eco-Drive watches generally don’t require frequent resetting, but a reset might be necessary after a complete power loss or if the watch malfunctions. The specific reset procedure varies by model; therefore, consulting your watch’s instruction manual (available as a PDF) is crucial.
Typically, a reset involves holding down a specific button or combination of buttons for a set duration. This process restores the watch to its factory default settings. Always refer to the manual’s troubleshooting section for detailed, model-specific instructions to avoid unintended consequences.

Maintenance and Care
Regular cleaning with a soft cloth and awareness of your watch’s water resistance rating will ensure longevity. Avoid harsh chemicals and extreme temperatures.
Cleaning Your Eco-Drive Watch
To maintain the appearance and functionality of your Citizen Eco-Drive watch, regular cleaning is essential. Use a soft, lint-free cloth dampened with lukewarm water to gently wipe the case and bracelet. For tougher grime, a mild soap solution can be used, but ensure it’s thoroughly rinsed off afterward.
Avoid abrasive cleaners, solvents, or polishing compounds, as these can damage the watch’s finish. Pay particular attention to cleaning the areas around the crown and pushers, where dirt and debris can accumulate. For metal bracelets, a soft brush can help remove dirt from between the links. Dry the watch completely with a clean cloth after cleaning.
Water Resistance Information
Citizen Eco-Drive watches offer varying degrees of water resistance, indicated by ATM (atmospheres) or meters. Understand your watch’s rating: 3 ATM/30m resists splashes, 5 ATM/50m is suitable for showering, and 10 ATM/100m for swimming. Diving requires 20 ATM/200m or higher.
However, water resistance isn’t permanent; seals age and can be compromised. Avoid operating the crown or pushers underwater. Regularly have the water resistance checked by a Citizen service center, especially after battery replacements (though rare in Eco-Drive). Temperature changes can also affect water resistance, so avoid extreme temperatures during water activities.
Battery Replacement (If Applicable ‒ Rare)
Citizen Eco-Drive watches are designed to minimize battery replacements due to their solar-powered nature. However, after many years, the secondary battery may eventually need replacing. This should only be performed by a qualified Citizen watch technician.
Attempting self-replacement risks damaging the watch’s intricate mechanisms and potentially voiding any warranty. A professional ensures proper sealing to maintain water resistance. Contact Citizen customer support or an authorized service center for battery replacement services and to ensure compatibility with your specific model.

Specific Model Instructions (U600 Series)
The U600 series features Atomic Time Synchronization for accurate timekeeping. Normal conditions allow for precise time, utilizing radio signals for updates.
U600 Atomic Time Synchronization
The Citizen Eco-Drive U600 series boasts Atomic Timekeeping, a remarkable feature ensuring exceptional accuracy. This function receives radio signals from atomic clocks, automatically adjusting the watch’s time. To initiate synchronization, ensure sufficient light exposure for power and a clear reception environment.
The watch will attempt to connect to the atomic clock signal several times daily. Successful synchronization is indicated by a visual cue on the dial. If synchronization fails, try moving to an open area, away from potential interference. Manual synchronization can also be initiated through the watch’s menu, as detailed in the full instruction manual.
U600 Specific Settings
The Citizen Eco-Drive U600 offers a range of customizable settings accessible through the crown and pushers. These include adjusting the display brightness, selecting a 12 or 24-hour time format, and configuring the perpetual calendar. The world time function allows viewing times in multiple cities.
Navigating the settings menu requires understanding the button functions outlined in the instruction manual. Proper configuration ensures optimal use of the U600’s advanced features. Remember to consult the PDF manual for detailed step-by-step instructions and illustrations, maximizing your watch’s functionality.

Specific Model Instructions (C650 Series)
The Citizen Eco-Drive C650 series features streamlined setting instructions for time, date, and advanced functions, detailed within the downloadable PDF manual.
C650 Setting Instructions Overview
The Citizen Eco-Drive C650 series offers a user-friendly experience, but understanding the initial setup is crucial. Begin by fully charging the watch by exposing the dial to bright light. To set the time, pull the crown out to the first click. Then, adjust the hands to the correct time, ensuring AM/PM is accurate.
For date setting, pull the crown to the second click and rotate to adjust the date. Returning the crown to its normal position completes the process. The C650 also boasts advanced features, accessible through crown manipulations, detailed in the official PDF manual for optimal usage and synchronization.
C650 Advanced Feature Usage
The Citizen Eco-Drive C650 series provides features beyond basic timekeeping. Utilizing the crown and pushers, you can access world time, displaying the time in various cities. The perpetual calendar function automatically adjusts for leap years, ensuring accurate date display for decades. Refer to the detailed PDF manual for specific button combinations and menu navigation.
Mastering these features enhances your C650 experience. Remember, proper synchronization and understanding of the watch’s operational logic, as outlined in the manual, are key to unlocking its full potential and enjoying its sophisticated functionalities.

Resources and Support
Citizen’s official website offers downloadable PDF manuals and FAQs. These resources provide comprehensive instructions and troubleshooting for your Eco-Drive watch.
Citizen Watch Official Website
Citizen’s official website is the primary hub for all things Eco-Drive. You’ll find a dedicated support section where you can search for and download PDF versions of your watch’s instruction manual. This is incredibly useful if you’ve misplaced the original or prefer a digital copy.
The website also hosts a comprehensive FAQ section addressing common issues and providing troubleshooting tips. Beyond manuals, Citizen provides information on watch care, warranty details, and authorized service centers. Regularly checking the official site ensures you have access to the latest updates and support resources for your Eco-Drive timepiece.
Frequently Asked Questions (FAQ)
Q: Where can I find my watch’s manual? A: The Citizen official website offers PDF downloads for most Eco-Drive models. Alternatively, search online using your specific model number.
Q: Why isn’t my watch charging? A: Ensure sufficient light exposure; even indoor light can work. Check the power reserve indicator. Q: How long does a full charge last? A: Typically around 7 months, but varies by model; Q: What if I can’t find my model’s manual? A: Contact Citizen customer support for assistance.