Seiko S760 Radio-Controlled Solar Watch

About This Watch

Thank you for choosing a Seiko watch. Please read this manual carefully for proper and safe use. Keep it handy for easy reference.

Handling Cautions

WARNING: Immediately stop wearing the watch if the body or band becomes corroded or if pins protrude. Consult a retailer or SEIKO CUSTOMER SERVICE CENTER. Keep watch and accessories out of reach of babies and children to prevent accidental swallowing.

CAUTIONS: Avoid wearing or keeping the watch in places with volatile agents (cosmetics, thinners), extreme temperatures (below 5°C or above 35°C for long periods), high humidity, strong magnetism or static electricity, dust, or strong vibrations. If skin irritation or allergic symptoms occur, stop wearing and consult a specialist. Do not disassemble or tamper with the watch.

Features

• Radio Signal Reception: Automatically receives standard frequency signals from Japan, Germany, the United Kingdom, and the United States of America to maintain precise time and date. Manual reception is also possible.
• Signal Strength Display: Indicates the strength of radio signals during reception.
• Signal Result Display: Shows the latest reception result (success or failure), along with the time, date, and transmitting station of the latest successful reception.
• Solar Charging Function: A solar panel converts light into electrical energy, stored in a secondary battery. A fully charged watch runs for approximately three months.
• Dual Time Display Function: Displays time in two different cities or regions simultaneously, chosen from 32 available cities/regions.
• Alarm Function: Features a daily alarm with up to three settable alarm times.
• Chronograph Function: Stopwatch measures up to 9 hours, 59 minutes, 59.99 seconds.
• Timer Function: Countdown timer settable from 1 minute to 9 hours and 59 minutes.
• Fully Automatic Calendar Function: Automatically adjusts for month-end and leap years from 2008 up to 2050.
• Remaining Battery Level Display: Shows the approximate remaining battery level.
• Power Save Function: Automatically activates when the watch is left without light exposure and buttons are not operated for a certain period, to suppress energy consumption.

Display and Button Operation

The watch features a main body with a built-in antenna for radio signal reception, a solar panel for charging, and a liquid crystal panel displaying various information. Key buttons include:

• [Button B]: Turns the built-in backlight on.
• [Button C]: Used for various functions depending on the mode, including displaying reception results or adjusting settings.
• [Button A]: Used to change modes or initiate setting procedures (e.g., holding for 3 seconds).
• [Button D]: Used for various functions depending on the mode, including displaying city codes/time differences or adjusting settings.

The liquid crystal panel displays the remaining battery level, a radio signal icon (indicating reception status), and mode icons:

• [Confirmation Sound Icon]: Indicates if the confirmation sound is set.
• [DST Icon]: Indicates if Daylight Saving Time is active.
• [Alarm Icon]: Indicates if the alarm is set.
• [Chronograph Icon]: Indicates if the chronograph is active.
• [Timer Icon]: Indicates if the timer is active.
• [Sleep Icon]: Indicates if the Power Save function is in SLEEP mode.
• [Radio Signal Icon]: Shows reception success/failure or signal strength during reception.

How to Change the Mode

Pressing [Button A] cycles through the watch's modes:

1. Home Time Mode (displays date, time, day of the week)
2. Dual Time Mode (displays local city code and local time)
3. Alarm Mode (displays measurement time)
4. Chronograph Mode (displays measurement time)
5. Timer Mode (displays measurement time)

After 2 seconds in each mode, the display typically shows specific information like local city code and time, or measurement details.

Home Time Mode

Displays the current date, time, and day of the week. This mode is used to set the watch's home time zone.

• [Button B]: Turns the built-in backlight ON.
• [Button C]: Displays the reception result.
• [Button A]: Changes modes or initiates home time setting (hold for 3 seconds).
• [Button D]: Displays the city code and time difference from UTC.

The [DST Indicator] appears when Daylight Saving Time is set. Pressing [Button D] or leaving the watch idle for 1 minute can switch the display between the day of the week and the city code/time difference.

City Code and Time Difference: Ensure the selected city code and its time difference from UTC accurately represent your location for proper radio signal reception. If the city code is set to TYO (Tokyo), the watch receives Japanese standard frequency signals (JJY).

How to Set the Home Time

This process allows setting the city code, Daylight Saving Time (DST), and manually adjusting the time and calendar.

1. Enter the HOME TIME mode.
2. Hold [Button A] for 3 seconds to begin setting. (The watch will auto-return to Home Time mode if left idle or [Button A] is held for 3 seconds during steps 3-10).
3. Set City Code and Time Difference: Use [Button C] or [Button D] to select the appropriate city code and time difference from UTC.
4. Set Daylight Saving Time: Use [Button C] or [Button D] to set DST to ON or OFF.
5. Set Time: Adjust Seconds, then Minutes, then Hours using [Button C] or [Button D].
6. Set Calendar: Adjust Year, then Month, then Day using [Button C] or [Button D].

Steps 7-10 cover setting confirmation sound and power save functions.

How to Set Confirmation Sound and Power Save Function

Continue from Step 1 on page 100.

1. Set 12H or 24H Format: Use [Button C] or [Button D].
2. Set Display Contrast: Adjust contrast level (1-7) using [Button C] or [Button D].
3. Set Confirmation Sound (ON/OFF): Use [Button C] or [Button D].
4. Set Power Save Function (ON/OFF): Use [Button C] or [Button D].

The watch returns to the HOME TIME mode after settings are complete or if left idle.

How to Set Time and Date (Radio Signal Reception)

Mechanism of Radio Signal Reception

The watch synchronizes its time and date with standard frequency signals broadcast from atomic clocks. The selected home time city code determines which transmitting station the watch attempts to receive signals from.

Automatic and Manual Reception

Automatic Reception: Occurs daily at 2:00 AM, 3:00 AM, or 4:00 AM, provided the watch is in HOME TIME or DUAL TIME mode and placed in a favorable reception environment. Reception stops if successful.

Manual Reception: Can be initiated at any time by pressing and holding [Button C] for over 3 seconds in the HOME TIME mode.

Reception Environment

Radio signal reception is influenced by various factors. Place the watch in an open area, preferably near a window, and keep it stationary during reception.

Radio Signal Reception Range

The watch can receive signals from:

• Japan (JJY): Approx. 1000 km radius from Hagane-yama (60 kHz) and Ohtakadoya-yama (40 kHz) stations. Indicators: JP40, JP60.
• Germany (DCF77): Approx. 700 km radius from Mainflingen (77.5 kHz) station. Indicator: GE77.
• United Kingdom (MSF): Approx. 800 km radius from Anthorn (60 kHz) station. Indicator: UK60.
• United States (WWVB): Approx. 1500 km radius from Fort Collins (60 kHz) station. Indicator: US60.

To Improve Reception: Rotate the watch towards the transmitting station, place it near a window, and keep it stationary. Avoid environments with radio interference, such as inside buildings, near tall structures, heavy traffic, electrical appliances, or metal furniture.

Checking Reception Status

Reception Results: In HOME TIME mode, press [Button C] once to display the latest reception result (success or failure). A signal icon indicates success; no icon indicates failure.

Latest Reception Information: Press [Button A] to HOME TIME mode, then press [Button C] once. The display shows the station indicator (e.g., JJY 40kHz, DCF77) and the time/date of the last successful reception.

How to Use the Dual Time Function

This function allows displaying the local time in 32 cities or regions worldwide alongside the home time.

Displaying Local Time

Enter DUAL TIME mode ([Button A]). Use [Button C] or [Button D] to select the desired city/region. The display shows the city code, local time, and time difference from UTC.

Daylight Saving Time (DST)

DST can be set ON or OFF for the local time by holding [Button A] for 3 seconds in the DUAL TIME mode.

City Names and Time Difference

A table lists 32 cities/regions with their city codes, time differences from UTC, and the corresponding receivable standard frequency signals:

Cities/regions marked with a star (*) observe Daylight Saving Time. Time differences and DST observance may change.

Switching Home Time and Local Time:

In the DUAL TIME mode, hold [Button B] for 5 seconds to swap the home time and local time displays.

How to Use the Alarm

The watch can be set with up to three daily alarms.

Setting the Alarm:

1. Enter ALARM mode ([Button A]).
2. Select the alarm number (1 to 3) using [Button C].
3. Hold [Button A] for 3 seconds to enter setting mode. Adjust Hour, then Minute using [Button C] or [Button D].

Upon completion, the alarm is automatically engaged. The confirmation sound must be set to ON in HOME TIME mode for the alarm to sound.

Engaging or Disengaging the Alarm (ON/OFF):

In ALARM mode, select the alarm number and press [Button D] to toggle the alarm ON or OFF. No icon appears when OFF.

Preview Alarm Sound: Hold [Button D] for 3 seconds.

To stop an active alarm, press any button ([Button A], [B], [C], or [D]).

How to Use the Chronograph

The chronograph functions as a stopwatch, measuring elapsed time.

Operation:

1. Enter CHRONOGRAPH mode ([Button A]).
2. Standard Measurement: Press [Button C] to start, press [Button C] again to stop. Press [Button D] to reset. The [Chronograph Icon] flashes while running.
3. Split Time Measurement: Press [Button C] to start. Press [Button D] to record a split time (displayed for 5 seconds). Press [Button D] again to record another split. Press [Button C] to stop the overall measurement. Press [Button D] to reset.

Note: The watch cannot receive radio signals while the chronograph is active.

How to Use the Timer

The timer counts down from a set time.

Operation:

1. Enter TIMER mode ([Button A]).
2. Set Timer: Hold [Button A] for 3 seconds. Adjust Hour, then Minute using [Button C] or [Button D].
3. Press [Button C] to start the countdown. A pre-warning beep sounds 3 seconds before the time is up. The timer beeps for 5 seconds when it reaches zero. The [Timer Icon] flashes while counting down.

Press [Button C] to pause/resume the timer. Press [Button D] to reset the timer after it has stopped. Note: The watch cannot receive radio signals while the timer is active.

Charging the Solar Battery

How to Charge the Battery

Expose the solar panel to light. To ensure optimal performance, keep the watch sufficiently charged at all times. The watch temperature should be kept under 50°C during charging.

Time Required to Charge the Battery

Charging times vary based on light conditions:

Frequent use of the backlight consumes battery quickly.

Remaining Battery Level Display

• Sufficient/Medium: No restrictions on operations or functions.
• Low ([CHARGE] indicator): Restricted operations/functions. Requires charging.
• Extremely Low (Blank display): Button operations and radio signal reception are not allowed. Alarm sounds are stopped. Display may go blank in darkness.
• Zero (Blank display): Watch cannot be operated.

To resolve low battery issues, charge the watch until the [CHARGE] indicator appears. If the display is blank, charge until the indicator appears, then manually set the time or receive radio signals.

Power Save Function

P.SAVE: The [P.SAVE Indicator] flashes when the watch is left without light and button operation for 4+ hours. Functions are restricted.

SLEEP: The [SLEEP Indicator] flashes when the watch is left without light and button operation for 3+ days. Radio signal reception and alarms are stopped. If SLEEP continues, the battery may deplete.

To cancel Power Save, expose the watch to light or press any button.

To Preserve the Quality of Your Watch

Daily Care

Wipe away moisture, sweat, and dirt with a soft cloth. Use a soft toothbrush for cleaning crevices. Rinse with clean water and dry carefully after exposure to seawater.

Water Resistance

Watch water resistance levels are indicated on the case back:

• No indication: Not water resistant.
• WATER RESISTANT: Withstands accidental contact with water (sweat, rain).
• WATER RESISTANT 5 BAR: Suitable for everyday water resistance; not suitable for swimming.
• WATER RESISTANT 10/20 BAR: Suitable for swimming and diving (not saturation diving).

WARNING: Do not use for scuba diving or saturation diving. Avoid operating the crown when wet. Steam, soap, or hot springs can degrade water resistance. Do not pour running water directly from a faucet, as tap water pressure can be high.

Band Care

Metallic Bands: Moisture and dirt can cause rust. Clean promptly. Titan bracelets may have stainless steel pins that can rust.

Leather Bands: Susceptible to discoloration and deterioration from moisture, sweat, and sunlight. Wipe clean and avoid prolonged sun exposure. Not recommended for water activities unless specified as 'Aqua Free'.

Polyurethane Bands: Susceptible to discoloration from light and deterioration from solvents. Clean with water. Replace if cracked or less flexible.

Skin Irritation: May be caused by metal/leather allergies or friction from dirt/band. Ensure proper band length for airflow (insert a finger between band and wrist).

Special Clasps

Details on adjusting special clasps (Type A, B, C) are provided, involving pins and adjustment holes.

Built-in Backlight (EL)

The electroluminescent panel's brightness decreases with battery voltage and use. Recharge the watch if the light becomes dim. Replacement may be needed if dimness persists.

Liquid Crystal Panel

The liquid crystal panel has a life expectancy of approximately 7 years. Replacement may be needed if contrast decreases.

Power Source

Uses a special secondary battery with an overcharge prevention function. Avoid charging the watch near intense light sources or in high temperatures (above 60°C).

Guarantee

One-year free repair/adjustment service for defects under normal use, provided the watch was properly used and the guarantee certificate is valid and filled correctly. The certificate is valid only in Japan.

After-Sale Service

Repair parts are usually retained for 7 years. Periodic inspection and adjustment (overhaul) every 3-4 years is recommended for optimal performance. Contact the retailer for service.

TROUBLESHOOTING

Manual Reception

To manually receive radio signals: Place the watch in a suitable location, enter HOME TIME mode, and press and hold [Button C] for over 3 seconds. Keep the watch stationary during reception. A blip confirms completion, and the result (success/failure) is displayed.

CHECK! Indicator

The [CHECK! Indicator] appears when the watch is in a mode that prevents radio signal reception (e.g., Chronograph or Timer is working, or the city code is incorrectly set). Stop the active function or correct the city code.

When the Watch Cannot Receive Radio Signals

Try receiving signals at a different location or orientation. Ensure the home time city code is correctly set. If reception fails, try manual reception at a different time of day, as conditions can vary.

Display Indicators

• Power Save (P.SAVE): [P.SAVE Indicator] flashes when the function is active.
• Power Save (SLEEP): [SLEEP Indicator] flashes when the function is in SLEEP mode.
• CHECK!: [CHECK! Indicator] flashing indicates a mode preventing reception.
• CHARGE: [CHARGE Indicator] appears when the battery level is low and requires charging.
• Blank Display: Indicates extremely low battery level or that the watch cannot be operated.
• All Indications Light: May occur if Button B is held down in the home time setting mode.

Troubleshooting Common Issues

• Wrong Time Indication: May be due to weak signal reception, extreme temperatures, incorrect city code, or incorrect DST setting. Try manual reception or correct settings.
• No Radio Signal Reception: Ensure watch is stationary, not moved during reception, and not in a mode that blocks reception. Check city code. Try different locations/times.
• Buttons Cannot Be Operated: Usually due to low battery level. Recharge the watch.
• Display Becomes Blank: Battery level is zero or extremely low. Recharge the watch.

How to Reset the Built-in IC

If the watch operates abnormally, reset the Built-in IC by holding [Button A], [Button B], and [Button C] simultaneously. The display will go blank, then show January 1, 12:00 AM. After resetting, set the time and calendar manually or via radio signal reception. The default city code will be TYO (Tokyo).

Specifications

• Frequency of crystal oscillator: 32,768 Hz
• Loss/gain (monthly rate): ±20 seconds per month (under normal conditions without radio signal reception).
• Operational temperature range: -5°C to +50°C (display function: 0°C to +50°C).
• Display medium: Nematic Liquid Crystal, FEM.
• Power Source: Secondary battery.
• Duration of operation: Approx. 3 months (fully charged, normal use). Approx. 11 months in SLEEP state.
• Radio Signal Reception Function: Automatic (2/3/4 AM) and manual reception.
• Built-in backlight: Electroluminescent panel.
• IC (Integrated Circuit): C-MOS-IC (3 pieces).

Specifications are subject to change without prior notice for product improvements.