Epson SOLAR Series Mode d’emploi

Watch Movement Specification and Drawing

SOLAR SERIES

Cal. VS72A

Movement Size

Casing Diameter

Height

Running Time

12’’’

27.0mm

4.40mm

Approx. 6 months

Date: 24/Sep./'19

Cal. VS72A

Items Rev. Page

Features 01 1

Specifications 03 2

Appearance 04 3

Casing 02 4

Hand fitting 02 5

Hand setting stem 01 6

Dial 01 7

Solar cell unit 02 8

Attention-01 02 9-01

Attention-02 03 9-02

Attention-03 01 9-03

Operation-01 01 10-01

Operation-02 01 10-02

Date :

1.Solar-powered watch

2. Eliminating the need for battery replacement

3. You can use the dial which light transmittance is more than 30%

It is possible to assemble the dial which transmits light on the solar cell.

It enabled to cover the solar cell color, and you can design variety colors of dials.

4. Running time

Expected running time from full charge to stoppage will be around 6 months.

5. Power depletion warning function

The two-second intervals movement of the second hand is a signal of energy depletion.

The watch continuous running time after two-second intervals movement is approximately 1 week.

6. Over charge prevent function is equipped

7. Structure of the separated parts

If the secondary battery is charged more than predetermined voltage, over charge prevent function is

operated to prevent the secondary battery deterioration and breakage.

This watch is a solar-powered watch containing a solar cell underneath the dial to convert any form of

light into '' electrical energy'' and store the power in a secondary battery.

Cal. VS72A Features 24/Apr./'15

Rev. : 01

Unlike conventional quartz watches, this watch does not use a silver oxide battery, thus eliminating the

need for battery replacement.

Solar cell unit

Solar cell lead terminal

Movement

Hand setting stem

Solar cell

Dial support ring

Secondary battery unit

Untransparent plate

P. 1

Date :

1. MOVEMENT DIMENSIONS

Outside diameter

27.60mm(12H-6H)

24.00mm(3H-9H)

Casing diameter

27.00mm(12H-6H)

Total height

4.4mm

2. TIME STANDARD

Type of quartz oscillator

Tuning fork

Frequency of quartz oscillator

32,768 Hz

Accuracy

20 seconds per month (on wrist)

Operating temperature range

−

℃

＋

℃

Regulation device

Nil (Pre-adjusted)

3. INDICATOR / FUNCTIONS

3 Hands

Hour / Minute / 1/5 second chronograph (Center)

Small hands

Alarm hour and minute (6H) / Small second (9H)

Minute chronograph (12H)

Calendar

Instant setting device for date calendar

Reset switch

Power depletion warning function (BLD)

(Second hand moves at 2-second intervals when voltage is 1.2V)

Alarm

Chronograph

Running time

Approx. 6 months (After fully charged)

4. FEATURES

Jewels

0 Jewels

Anti-magnetism

Over 1600A/m (Direct current magnetic field)

Driving current consumption

Approx. 0.65

A (1.35V , Chronograph non-operates)

Operation stopping voltage

1.0V

Solar cell type

Amorphous silicon solar cell

Maximum unbalance of hands

Small second hand

: 0.03

・

Minute chronograph / Alarm minute hand

: 0.03

・

Alarm hour hand

: 0.025

・

1/5 second chronograph hand

: 0.09

・

Minute hand

: 0.70

・

Moment of inertia

1/5 second chronograph hand

: less than 0.12

・

m²

5. SECONDARY BATTERY

Type

Titanium-lithium-ion secondary battery

Size

9.5

t 2.05 mm

Capacity

5mAh

Nominal voltage

1.5V

6. SEPARATED PARTS (Parts code)

Hand setting stem

0351587

Secondary battery unit

302334T

Solar cell unit

4020551

Solar cell lead terminal ( 2 pcs )

4281516

Untransparent plate

4453500

Piezoelectric element

4589801

7. TEST OF ACCURACY

Equipment to be used

SEIKO quartz tester QT-99

Greiner quartz timer-C , Witschi Q-tester 4000

Duration of measurement

10 seconds

Microphone to be used

Electromagnetic detection type

All specifications are subject to change without notice.

Solar Analog Quartz 12''' Center Second Chronograph Movement

Cal.

Rev. : 03

1/Sep./'15

VS72A Specifications

The chronograph can measure up to 60 minutes in 1/5 second

increments.

P. 2

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