Epson SOLAR Series Guide

Watch Movement Specification and Drawing
SOLAR SERIES
Cal. VS76A
Movement Size
Casing Diameter
Height
Running Time
12’’’
Ø 27.0mm
4.40mm
Approx. 6 months

Date: 24/Sep./'19
Cal. VS76A
Items Rev. Page
Features 01 1
Specifications 02 2
Appearance 02 3
Casing 01 4
Hand fitting 02 5
Hand setting stem 01 6
Dial 01 7
Solar cell unit 01 8
Attention-01 02 9-01
Attention-02 02 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. VS76A 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 φ27.60mm(12H-6H) ×24.00mm(3H-9H)
Casing diameter φ27.00mm(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 −5℃to ＋50℃
Regulation device Nil (Pre-adjusted)
3. INDICATOR / FUNCTIONS
3 Hands Hour / Minute / Second chronograph (Center)
Small hands Minute chronograph (6H) / Small second (9H)
1/20 second 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)
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. 0.65μA (1.35V , Chronograph non-operates)
Operation stopping voltage 1.0V
Solar cell type Amorphous silicon solar cell
Maximum unbalance of hands Small second hand : 0.03μN・m
Minute chronograph hand : 0.03μN・m
1/20 second chronograph hand : 0.03μN・m
Second chronograph hand : 0.06μN・m
Minute hand : 0.70μN・m
Moment of inertia Second chronograph hand : less than 0.12μg・m²
5. SECONDARY BATTERY
Type Titanium-lithium-ion secondary battery
Size φ9.5 ×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
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. : 02
1/Sep./'15
VS76A Specifications
The chronograph can measure up to 60 minutes in 1/20 second
increments.
P. 2