1. Introduction
This manual provides detailed instructions for the Citizen Promaster Skyhawk A-T Eco-Drive Pilot Watch, Model JY8078-01L. This timepiece combines advanced atomic timekeeping with Citizen's innovative Eco-Drive technology, ensuring precise timekeeping without the need for battery replacement. Designed for pilots and enthusiasts, it features a comprehensive set of functions including a chronograph, perpetual calendar, dual time, alarms, and a pilot's rotating slide rule bezel.
Figure 1: Citizen Promaster Skyhawk A-T Eco-Drive Pilot Watch (Model: JY8078-01L) with blue leather strap.
2. Initial Setup
Before using your watch, ensure it is adequately charged and synchronized. The Eco-Drive technology allows the watch to charge from any light source.
2.1. Initial Charging
Place the watch in direct sunlight or under strong artificial light for several hours to ensure a full charge. The power reserve indicator will show the current charge level. Avoid placing the watch in extreme heat.
Video 1: Explanation of Citizen Eco-Drive Technology and how it charges the watch using light.
2.2. Atomic Time Synchronization
Your watch automatically synchronizes with atomic time signals for superior accuracy. This typically occurs overnight. For manual synchronization or to set your home city, refer to the detailed operating instructions in Section 3.1.
Video 2: Detailed explanation of how Atomic Timekeeping works in Citizen watches.
3. Operating Instructions
The Promaster Skyhawk A-T features an Ana-Digi display, combining analog hands with digital displays for various functions. Familiarize yourself with the watch's layout using the diagram below.
Figure 2: Watch Dial and Function Overview.
3.1. Setting Home City and Time Zone
- Pull the crown out to the first position.
- Rotate the crown to select your desired home city (time zone). The digital display will show the city code.
- Push the crown back in to set. The watch will adjust its time and date accordingly.
3.2. Using the Chronograph
The 1/100 second chronograph measures up to 24 hours.
- Enter Chronograph mode (CHR) using the mode hand.
- Press the upper right button to start/stop the chronograph.
- Press the lower right button to reset.
3.3. Perpetual Calendar
The perpetual calendar automatically adjusts for month lengths and leap years until 2100. No manual date adjustment is required once the home city is set.
3.4. Dual Time (Second Time Zone)
The watch can display a second time zone. To switch between home time and the second time zone, press the two side buttons simultaneously.
3.5. Alarms
The watch features two independent alarms (AL-1, AL-2).
- Enter Alarm mode (AL-1 or AL-2) using the mode hand.
- Use the crown and buttons to set the desired alarm time.
- Activate or deactivate the alarm as per the on-screen indicators.
3.6. Countdown Timer
A 99-minute countdown timer is available.
- Enter Timer mode (TMR) using the mode hand.
- Set the countdown duration using the crown and buttons.
- Start and stop the timer using the appropriate buttons.
3.7. Digital Backlight and UTC Display
The digital displays feature a backlight for low-light conditions. The Universal Coordinated Time (UTC) can also be displayed on one of the digital screens.
3.8. Power Reserve Indicator
The power reserve indicator shows the remaining charge level of the Eco-Drive power cell. Keep the watch exposed to light to maintain optimal charge.
3.9. Pilot's Rotating Slide Rule Bezel
The rotating slide rule bezel can be used for various aviation calculations, such as multiplication, division, fuel consumption, and speed calculations. Consult specialized aviation resources for detailed usage of the slide rule.
4. Key Features
- Eco-Drive Technology: Powered by any light, eliminating the need for battery replacement.
- Atomic Timekeeping: Synchronized to atomic time clocks in 43 world cities for superior accuracy. Automatically adjusts for Daylight Saving Time.
- Promaster Air Design: Modern, pilot-inspired design with robust construction.
- Anti-Reflective Sapphire Crystal: Highly scratch-resistant and provides clear visibility.
- Water Resistance: Rated for 200 meters (660 feet), suitable for professional marine activity and serious surface water sports, but not scuba diving.
- Blue Angels Insignia: Features the iconic Blue Angels insignia on the caseback, reflecting precision and performance.
Figure 3: Caseback with Blue Angels Insignia.
5. Care and Maintenance
5.1. Charging Guidelines
To maintain optimal performance, expose your Eco-Drive watch to light regularly. A fully charged watch can run for several months in the dark, but consistent exposure to light is recommended. If the watch stops, expose it to bright light for several hours to restart and recharge.
5.2. Cleaning
Wipe the watch case and strap with a soft, dry cloth. For water-resistant models, a damp cloth can be used, ensuring the crown is pushed in. Avoid using harsh chemicals or abrasive materials.
5.3. Water Resistance
The watch is water-resistant to 200 meters. Ensure the crown is fully pushed in before any contact with water. Do not operate buttons or the crown while the watch is wet or submerged.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Watch stops or hands do not move. | Insufficient charge. | Expose the watch to bright light for several hours to recharge. |
| Time is incorrect. | Incorrect home city setting or failed atomic synchronization. | Verify home city setting (Section 3.1). Ensure the watch is in an area with good signal reception for atomic synchronization, especially overnight. |
| Digital display is blank or dim. | Low power reserve. | Charge the watch fully. |
| Buttons or crown are stiff. | Dirt or debris accumulation. | Clean the watch with a soft, damp cloth. If the issue persists, contact Citizen service. |
7. Specifications
- Model Number: JY8078-01L
- Caliber: U680
- Movement: Eco-Drive (Light-Powered)
- Timekeeping: Atomic Timekeeping with Synchronized Time Adjustment in 43 World Cities
- Case Material: Stainless Steel
- Strap Material: Indigo Blue Italian Leather with Yellow Contrast Stitching
- Dial Color: Dark Blue with Yellow Accents
- Crystal: Anti-Reflective Sapphire Crystal
- Water Resistance: 200 Meters (660 Feet)
- Functions: 1/100 Second Chronograph (up to 24 hours), Perpetual Calendar, Dual Time (Second Time Zone), 2 Alarms, 99-Minute Countdown Timer, Digital Backlight Display, Universal Coordinated Time (UTC) Display, Power Reserve Indicator, Pilot's Rotating Slide Rule Bezel, Luminous Hands and Markers.
- Dimensions: 4.72 x 4.72 x 4.72 inches (Product Box Dimensions); Watch dimensions are typically around 46mm case diameter.
- Weight: 11.11 ounces (Product Box Weight)
8. Warranty & Support
Your Citizen Promaster Skyhawk A-T watch comes with a 5-Year Limited Warranty. This warranty covers manufacturing defects under normal use. Please retain your proof of purchase for warranty claims.
For detailed warranty terms, service requests, or additional support, please visit the official Citizen Watch website or contact their customer service department. You can often find comprehensive user guides and FAQs on their support pages.
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