Epson SOLAR Series Guide

Watch Movement Specification and Drawing
SOLAR SERIES
Cal. VS15A
Movement Size
Casing Diameter
Height
Running Time
5 1/2’’’
11.8 × 15.15 mm
2.49mm
Approx. 6 months

Date: 30/Jul./'19
Cal. VS15A
Items Rev. Page
Features 01 1
Specifications 05 2
Appearance 03 3
Casing 04 4
Hand fitting 01 5
Hand setting stem 01 6
Dial-01 01 7-01
Dial-02 01 7-02
Dial-03 00 7-03
Dial-04 00 7-04
Dial-05 00 7-05
Solar cell unit-01 03 8-01
Solar cell unit-02 05 8-02
Solar cell unit-03 00 8-03
Solar cell unit-04 00 8-04
Solar cell unit-05 00 8-05
Attention-01 02 9-01
Attention-02 00 9-02

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. Over charge prevent function is equipped
6. 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.
Unlike conventional quartz watches, this watch does not use a silver oxide battery, thus eliminating the
need for battery replacement.
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. VS15A Features 24/Apr./'15
Rev. : 01
Solar cell unit
Solar cell lead terminal
Movement
Dial washer
Hand setting stem
Hour wheel
Casing ring
Solar cell
P. 1

Date :
1. MOVEMENT DIMENSIONS
Outside diameter 11.8mm(3-9H) ×15.55mm(12-6H)
Casing diameter 11.8mm(3-9H) ×15.15mm(12-6H)
Total height 2.09mm (Including solar cell : 2.49mm)
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
2 Hands Hour / Minute
Reset switch
Running time Approx. 6 months (After fully charged)
Setting mechanism Crown at normal position : Free
Crown pulled out 1st click : Time setting / Reset
4. FEATURES
Jewels 0 Jewels
Anti-magnetism Over 1600A/m (Direct current magnetic field)
Driving current consumption Approx. 0.16μA (1.35V)
Operation stopping voltage 1.0 V
Solar cell type Amorphous silicon solar cell
Maximum unbalance of hands Minute hand : 0.15μN・m
Hour hand : 0.13μN・m
5. SECONDARY BATTERY (Installed)
Type Titanium-lithium-ion secondary battery
Size φ5.8mm ×t 1.65mm
Nominal voltage 1.5 V
Capacity 0.9 mAh
6. SEPARATED PARTS (Parts code)
Solar cell unit 4020583 (ROUND) 4020536 (ROUND-2)
4020584 (SQUARE-1) 4020532 (SQUARE-2)
4020585 (TONNEAU)
Hand setting stem 0351819
Solar cell lead terminal (2 pcs) 4246644
Hour wheel 0271946
Dial washer 0491735
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.
Cal.
Solar Quartz 5 1/2''' Movement / Tow hands(H/M)
VS15A
Rev. : 05
30/Jul./'19
Specifications
P. 2

Date :
1. How to remove the setting stem
The ''setting lever'' can not be push if the setting stem is not at normal position.
Please do not transform the earth spring.
2. Attention for solar cell unit
Pay attention not to touch and scratch the surface of the solar cell.
3. Dial transparency rate
Keep the transparency rate of the dial more than 30%.
Each elements of solar cell must be kept the transparency rate.
4. The guideline of charging time is as in below
(Dial transparency rate = 30%)
Illumination
(Lx) Source of light Environment A
(Approx.
Hours)
C
(Approx.
Minutes)
700 Inside the office －50
3,000 30W 20cm 40 11
10,000 Cloudy 12 3
100,000 Fine weather 2 1
Condition A : Time required for full charge
Condition B : Time required for steady operation
Condition C : Time to charge 1 day of power
5. Attention for the secondary battery unit
Please set the exclusive secondary battery unit.
(The secondary battery is Titanium-lithium-ion battery without any environmentally harmful substances.)
If the silver oxide battery is accidentally set and charged, there is a possibility of batｔery explosion.
6. Caution
When removing the setting stem, put the setting stem at normal position and push the ''setting lever''
by tweezers.
Cal.
VS15A Attention-01
30/Nov./'17
Rev. : 02
When removing the setting stem, pay attention not to break or not to cut off the circuit block.
To prevent from the battery explosion, it is adopted safety structure not to charge the silver oxide
battery even if it is accidentally set.
When charging the watch, do not place it too close to fluorescent lamp or other light sources as the
watch temperature will become extremely high, causing damage to the parts inside the watch.
A fluorescent lamp
Sun light
B
(Approx.
Hours)
0.5
4
10
40
Earth spring
P. 9-01

Date :
7. How to set the solar cell lead terminal
Please set 2pcs of solar cell lead terminals in accordance with this illustration.
As to the solar cell lead terminal shape, there is no distinction between upper and lower.
8. How to set the solar cell unit
Push above part of each hook on the solar cell unit into main plate certainly.
9.How to set the dial
The dial is held by the four guide poles on the solar cell unit.
Cal. VS15A Attention-02 24/Apr./'15
Rev. : 00
P. 9-02