Seiko 7D56, 7D48, 7D46 manual Specifications

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32,768 Hz (Hz = Hertz … Cycles per second)
Less than 15 seconds (worn on the wrist at normal temperature range between 5º C and 35º C) Between –10º C and +60º C

English

SPECIFICATIONS

1 Frequency of crystal oscillator ..........................

2 Loss/gain (monthly rate) ....................................

3 Operational temperature range .........................

4Driving system

•Step motor: 2 pieces

One for the hour and minute hands moving at five-second intervals The other for the second hand moving at one-second intervals

•Piezoelectric motor (For perpetual calendar): 1 piece

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Rechargeable battery

Button type, 1 piece

6

Continuous operating time

 

 

• Time relay function

Approximately 4 years (if the watch is fully charged)

 

• After the second hand starts moving

 

 

at two-second intervals

Approximately 12 hours

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Additional functions

Power save function, Perpetual Calendar, Energy

 

 

depletion forewarning function, Overcharge prevention

 

 

function

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IC (Integrated Circuit)

C-MOS-IC, 3 pieces

 

Oscillator, frequency divider, drive and charge control, auto-relay control circuit, calendar control

 

circuit

 

9

Generating system

Miniature AC generator

*The specifications are subject to change without prior notice for product improvements.

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Contents Cal D46, 7D48 & 7D56 Contents Features Power Save Function and Time Relay FunctionPerpetual Calendar Function Watch remains operable for approximately four yearsPower Save Function Display and Button OperationBefore Initial USE Remarks on Power Save Function Time Relay FunctionHOW to Wake UP the Watch from Power Save Mode HOW to Operate the Screw Lock Type CrownScrew Lock Type Crown To unscrew the crownHOW to SET the Time and Calendar HOW to SET the Time Cal D46Second click position Original position HOW to SET the Perpetual Calendar Avoid setting the time or calendar at a time between 2300Cal D48 Cal D56 Crown at the firstClick position Crown at the first click positionHOW to Charge the Watch If the Second Hand Starts Moving AT TWO Second IntervalsEnergy Depletion Forewarning Function Power Reserve Guidelines for the Rechargeable Battery Generate power to resume the normal operational movementPower to run the watch for approximately one day At a rate of twice a second, making an arc of about 20 cmSpecifications

7D48, 7D46, 7D56 specifications

The Seiko 7D56, 7D46, and 7D48 are notable movements within Seiko's lineup of automatic watches, celebrated for their precision, reliability, and innovative features. These movements are part of the caliber family that showcases Seiko's commitment to quality craftsmanship and ingeniously designed technology.

The Seiko 7D56 is an automatic movement that stands out for its remarkable features, including a date display and day of the week complication, which adds a practical edge to its functionality. The movement utilizes a 21,600 vibrations per hour (vph) frequency, which ensures smooth operation and accurate timekeeping. One of its distinctive aspects is the hacking feature, allowing users to stop the second-hand while setting the time, leading to increased accuracy when syncing with another timepiece.

The 7D46, similar in design to the 7D56, merges functionality with style. It presents a sleek profile and appeals to those who appreciate both classic and contemporary aesthetics. Like the 7D56, it also includes a date function and operates at a frequency of 21,600 vph. This movement is particularly renowned for its durability and versatility, making it a preferred choice among watch enthusiasts seeking a reliable automatic timepiece.

The 7D48 movement is another esteemed member of this family, often found in Seiko's diverse range of watches. It features a power reserve of approximately 40 hours, making it a dependable option for daily wear. The 7D48 is crafted to be lightweight, which adds to wearing comfort while maintaining its robustness. Like its counterparts, it offers reliable timekeeping with a simple yet elegant design that fits various styles and occasions.

All three movements benefit from Seiko's advanced engineering and design philosophy, which emphasizes longevity and performance. They are crafted using high-quality materials and are meticulously assembled, ensuring that each movement meets the company's rigorous standards. Moreover, the incorporation of a transparent case back in many models allows wearers to appreciate the intricate mechanics at play within these movements.

In summary, the Seiko 7D56, 7D46, and 7D48 movements represent a harmonious blend of functionality, reliability, and aesthetic appeal. They embody Seiko's dedication to innovation while providing watch enthusiasts with exceptional timepieces that cater to diverse preferences and needs. These movements are a testament to Seiko's esteemed position in the world of horology.
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