Seiko 7D46, 7D48 & 7D56 User Manual

Introduction

Characteristics

SEIKO KINETIC Cal. 7D46/7D48/7D56 represents an analog quartz wristwatch with an automatic energy generation system developed by SEIKO. This system generates electrical energy using hand movements and stores it in a KINETIC accumulator, eliminating the need for periodic battery replacement, unlike traditional button-cell batteries. The watches feature additional functions.

Energy Saving Function and Time Relay

To conserve generated electrical energy, the watch automatically activates an energy-saving function if it is not worn for more than 24 hours. If you decide to wear the watch again, simply shake it a few times, and the hands will start moving to show the correct time.

After exiting the energy-saving mode, the restored time may differ from the actual time by the permissible accuracy (±15 seconds per month).

If the watch is fully charged and in energy-saving mode, the time relay function remains active for approximately 4 years.

Perpetual Calendar

Once correctly set, the perpetual calendar automatically adjusts and shows the correct date, even in February of a leap year. (Manual adjustment is required at the end of February in years that are divisible by 4 but are not leap years, such as 2100).

The calendar takes approximately 2 seconds to change its display. However, this may take up to 2 minutes if the temperature is low or the stored energy reserve is small.

The perpetual calendar continues to function when the watch is in energy-saving mode.

If the watch has completely stopped due to insufficient energy reserve, you can easily set the calendar manually.

ATTENTION

The battery is recharged when your hand is in motion. If the watch is on your wrist but your hand is not moving, it will not be charged.

It is recommended to wear the watch for at least 10 hours daily.

Dial and Buttons

Caliber 7D46

Diagram showing the dial of Caliber 7D46:

• Large Date Window
• Hour Hand
• Year Indicator
• Second Hand
• Month Indicator
• Minute Hand
• Crown (Push clockwise/upwards)
• Crown Position 1: Calendar Setting (Push clockwise/upwards)
• Crown Position 2: Time Setting (Push clockwise/upwards)
• 24-Hour Indicator
• Crown (Push counter-clockwise/downwards)

Caliber 7D48

Diagram showing the dial of Caliber 7D48:

• Large Date Window
• Hour Hand
• Year Indicator
• Second Hand
• Month Indicator
• Minute Hand
• Crown (Push clockwise/upwards)
• Crown Position 1: Calendar Setting (Push clockwise/upwards)
• Crown Position 2: Time Setting (Push clockwise/upwards)
• 24-Hour Indicator
• Crown (Push counter-clockwise/downwards)

Caliber 7D56

Diagram showing the dial of Caliber 7D56:

• Large Date Window
• Hour Hand
• Year Indicator
• Second Hand
• Month Indicator
• Minute Hand
• Crown (Push clockwise/upwards)
• Crown Position 1: Calendar Setting (Push clockwise/upwards)
• Crown Position 2: Time Setting (Push clockwise/upwards)
• 24-Hour Indicator
• Crown (Push counter-clockwise/downwards)

Note: The positions of the year, month, and 24-hour indicators may vary depending on the model.

Before First Use

Energy Saving Function

The watch uses electrical energy generated and stored by the Kinetic System. It also features an energy-saving function that automatically stops the hands to reduce energy consumption when the watch is not used for an extended period. When the watch is in standby mode, the hands do not move, but the built-in IC continues to track time and dates.

If the watch is in energy-saving mode, simply shake it a few times to activate the time relay, which will automatically set the watch hands to the correct time.

WARNING:

Do not pull the crown to the second click position while the watch is in energy-saving mode. This may disable the energy-saving function and disrupt the timekeeping.

Do not leave the crown pulled out to the second click position, as this increases energy consumption compared to the energy-saving mode.

About the Energy Saving Function

The energy-saving function automatically activates if the watch is not used for 24 hours.

If the second hand moves with a 2-second interval, the energy-saving function may not have been activated.

When the energy-saving function is active, the hour, minute, second, and 24-hour hands stop.

The calendar operates normally when the energy-saving function is active.

If the date is incorrect after exiting energy-saving mode, it means the watch was not sufficiently charged. Charge the watch until the second hand moves with a 1-second interval, then reset the time and calendar.

When the watch returns to normal operation after the energy-saving function is deactivated, but the charge is very low, the second hand will move with a 2-second interval. (See "If the second hand moves with a 2-second interval" on page 19).

Time Relay Function

When the energy-saving function is active, the hands stop, but the built-in IC continues to track time. When sufficient electrical energy is generated, the watch hands move and automatically set themselves to the correct time.

The operating time of the time relay function depends on the energy reserve in the watch. If the energy-saving function is activated in a fully charged watch, it will operate for approximately 4 years.

If the energy reserve runs out while the energy-saving function is active, shaking the watch will not activate the time relay function. Instead, the second hand will start moving with a 2-second interval. (See "How to Start the Watch After Energy Saving Mode" on page 11 or "If the second hand moves with a 2-second interval" on page 19).

Screw-down Crown

Some models are equipped with a screw-down crown that can be locked when not in use.

Locking the crown prevents accidental setting.

Unscrew the crown before use. Screw it back in after completing settings.

How to Operate the Screw-down Crown

If your watch is equipped with a screw-down crown, unscrew it before use.

Always keep the crown locked when it is not in use.

Diagram: Unscrewing the crown. To unscrew the crown, turn it counter-clockwise (downwards). The crown is now unlocked and ready for operation.

Diagram: Screwing in the crown. After completing operations with the crown, screw it in clockwise (upwards) with light pressure until it stops. The crown can now be pulled out.

Rotate the crown while pressing it.

How to Start the Watch After Energy Saving Mode

To "wake up" the watch after energy saving mode, gently shake it side-to-side to charge it.

Do not pull the crown to the second click position before completing this procedure. This may disable the time relay function.

Shake the watch rhythmically side-to-side 4-6 times at a frequency of 2 times per second, describing a 20 cm arc, as shown in the illustration.

Diagram: Shaking the watch. The second hand remains still.

Faster or more intense shaking will not affect the battery charge.

When shaking the watch, the rotor in the energy generation system rotates and drives the movement. The rotor may produce some noise during rotation, which is not a malfunction.

Notes

If there is a time difference between the factory settings and the local time, reset the time and calendar before using the watch.

When the energy-saving function is activated, the built-in IC calculates time with an accuracy of ±15 seconds per month, which is equivalent to the accuracy of ordinary quartz watches. However, after exiting the energy-saving mode, the restored time may differ from the actual time by the permissible accuracy (±15 seconds per month). In this case, reset the correct time before using the watch.

If the watch exits energy-saving mode but the energy reserve is very low, the second hand will move with a 2-second interval. (See the section "If the second hand moves with a 2-second interval" on page 19).

How to Set Time and Calendar

If there is a time difference between the factory settings and the local time, reset the time and calendar before using the watch.

If the watch has completely stopped due to lack of energy, charge the watch until the second hand starts moving with a normal 1-second interval. Then, set the time and calendar. (See the section "If the second hand moves with a 2-second interval" on page 19).

1. Only the hour, minute, and 24-hour hands move quickly to indicate the current time stored by the built-in IC.

2. Then, the second hand quickly returns to normal movement.

Diagram: Second hand remains stationary.

How to Set Time

Diagram showing crown positions for Caliber 7D46.

Diagram showing crown positions for Caliber 7D48.

Diagram showing crown positions for Caliber 7D56.

Crown Operation

1. Pull the crown to the second click position. The second hand will stop. If your watch is equipped with a screw-down crown, unscrew it first, then pull the crown to the second click position. To set the second hand precisely, pull the crown when the second hand is at the 12 o'clock position (0 seconds).

2. Rotate the crown to set the time. Check the correct setting of the 24-hour indicator (AM/PM). For precise time setting, it is recommended to first set the minute hand 4-5 minutes ahead, then return it to the desired time.

3. Return the crown to its initial position. The watch will start running. To set the second hand precisely, return the crown to its initial position simultaneously with a time signal.

WARNING:

Do not set the time and calendar between 23:00 and 01:00.

If you set the calendar between 23:00 and 01:00, and the watch shows an incorrect date, reset the watch, avoiding settings during the specified period.

Date changes occur between 23:30 and 00:30 when the watch is operating normally.

How to Set Perpetual Calendar

The date, month, and year are displayed on the perpetual calendar. To set the month or year, change the date by rotating the crown until the month or year changes.

Diagram showing crown position for setting calendar (1st click).

Calendar settings are made by rotating the crown in either direction when pulled out to the 1st click.

Notes on Setting Month and Year

When the date changes to '1', the month indicator rotates one division and indicates the next month. When the date changes to 1, and the month indicator changes from December (Dec) to January (Jan), the year indicator rotates, signifying a year change.

ATTENTION

When setting the calendar backward, set the date one or two days earlier than the desired date, then rotate forward to set the correct date.

Follow this procedure when setting the calendar backward; otherwise, the date may not appear centered in the date window. Even if this happens, the date for the next day will be positioned correctly.

When setting the calendar backward to December, the year indication may be misaligned. In this case, set the calendar to November, then rotate forward to set the correct date for December.

Setting Procedure

1. The calendar must be set in the following order: year, then month, then date. Pull the crown out to the first click position. If your watch is equipped with a screw-down crown, unscrew it first, then pull the crown to the first click position.

2. Rotate the crown until the year changes. Continue rotating the crown to set the month. Calendar changes occur in the order: date, then month, then year. You can set the calendar by rotating the crown in either direction (up or down).

Diagrams showing year indicators for Caliber 7D46, 7D48, 7D56.

The year indicator shows the number of years that have passed since the last leap year. When setting the year, confirm whether you intend to set a leap year or not. If not a leap year, check how many years have passed since the last leap year.

3. Rotate the crown until the desired year appears. Continue rotating the crown to set the month.

Example: Month indicator is in the July position.

4. Rotate the crown to set the desired month. Continue rotating the crown to set the desired date.

Example: Date is 26.

5. After finishing the year, month, and date settings, return the crown to its initial position.

If the Second Hand Moves with a 2-Second Interval

(Low Energy Warning Function)

If the second hand starts moving with a 2-second interval, the remaining energy reserve is sufficient for approximately 12 hours.

If the energy reserve is low, after the watch exits energy-saving mode, the second hand will move with a 2-second interval.

In this case, shake the watch side-to-side to charge the accumulator, then set the time and calendar.

How to Charge the Watch

1. Shake the watch side-to-side approximately twice per second, as shown in the illustration. Continue shaking until the second hand starts moving with its normal interval.

Diagram: Shaking the watch. The second hand moves with a 1-second interval after charging.

If, after shaking, the second hand still moves with a 2-second interval, shake it further until the second hand moves with a normal 1-second interval.

For effective battery charging, shake the watch rhythmically at a frequency of 2 times per second, describing a 20 cm arc.

Faster or more intense shaking will not affect the battery charge.

If the watch has not been used for a long time and is completely discharged, it requires at least 450 shakes for a full charge to ensure normal operation of the movement.

2. It is recommended to shake the watch until enough energy is accumulated to operate the watch without recharging for one day.

For information: 200 shakes provide approximately 1 day of energy reserve.

Notes on Rechargeable Battery Power Reserve

Wearing the watch for 12 hours provides an additional energy reserve of 1.5 days.

For information: If you wear the watch for at least 12 hours a day for a week, the additional power reserve will be 10 days, or 1.5 months in energy-saving mode.

Source of Energy (Rechargeable Battery)

The watch does not require periodic battery replacement as it is equipped with a rechargeable accumulator, which differs from ordinary watch batteries.

The rechargeable accumulator is an environmentally friendly energy storage device.

ATTENTION

Never install other types of batteries (especially silver oxide) instead of the rechargeable accumulator. They may overheat and cause fire or explosion.

Notes on Technical Inspection

The watch is a precision mechanism. With worn parts or insufficient lubrication, the watch may run slow or stop. It is recommended to have your watch undergo periodic technical inspection to maintain its accuracy.

Technical Specifications

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