Epson Solar VS76A User manual

Watch Movement Specification and Drawing
SOLAR SERIES
Cal. VS76A
Movement Size
Casing Diameter
Height
Running Time
12’’’
Ø27.0mm
4.40mm
Approx. 6 months

Date: 1/Sep./'15
Cal. VS76A
Items Rev. Page
Features 01 1
Specifications 02 2
Appearance 02 3
Casing 01 4
Hand fitting 01 5
Hand setting stem 01 6
Dial 01 7
Solar cell unit 01 8
Attention-01 01 9-01
Attention-02 01 9-02
Attention-03 00 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 :
31/Oct./'12
MOVEMENT SPECIFICATIONS Rev. : 00
CAL. VS76A
Analog Quartz 12''' Center Second Chronograph Movement
1. MOVEMENT DIMENSIONS
Outside diameter φ27.60mm(12H-6H) ×24.00mm(3H-9H)
Casing diameter φ27.00mm(12H-6H)
Total height 4.4mm (including battery)
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 hand (Center)
Small hands Small second hand (9H) / 1/20 second chronograph hand (12H)
Minute chronograph hand (6H)
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)
Working time Approx. 6 months (After fully charged)
Charging time Approx. 5 hours (Under 100 KLX sunlight)
Approx. 65 hours (Under 3000LX fluorescent lamp)
Setting mechanism Crown at normal position : Free
Crown pulled out 1st click : Instant date change
Crown pulled out 2nd click : Time setting / Reset
: Chronograph hand reset
Chronograph 2H button : start / stop
4H button : split / reset
4. FEATURES
Jewels 0 Jewel
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 (3μg･m)
Minute chronograph hand : 0.03μN・m (3μg･m)
1/20 second chronograph hand : 0.03μN・m (3μg･m)
Second chronograph hand : 0.06μN・m (6μg･m)
Minute hand : 0.70μN・m (70μg･m)
Moment of inertia Second chronograph hand : less than 0.12μg・m²
5. SECONDARY BATTERY
Type Titanium-lithium-ion second 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 302324H
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. P.1

Date :
31/Oct./'12
VS76A Features
Rev. : 00
1. Solar-powered watch
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.
2. Eliminating the need for battery replacement
Unlike conventional quartz watches, this watch does not use a silver oxide battery, thus eliminating the need
for battery replacement.
3. Working time
Expected life per charge from full charge to stoppage will be around 6 months.
4. Power depletion warning function
The two-second interval movement of the second hand is a signal of energy depletion.
The watch continuous working time after two-second interval movement is approximately 1 week.
When the second hand starts moving at two-second intervals, please charge the watch by exposing it to light.
5. Eco-friendly
The secondary battery is Titanium-lithium-ion battery without any environmentally harmful substances.
6. Over charge prevent function is equipped
If the secondary battery is charged more than predetermined voltage, over charge prevent function is operated
to prevent the secondary battery deterioration and breakage.
P. 8

Date :
1. Attention for solar cell unit
Pay attention not to touch and scratch the surface of the solar cell.
2. Dial transparency rate
Keep the transparency rate of the dial more than 30%.
(Effective aperture is φ27mm)
Each elements of solar cell must be kept the transparency rate.
3. 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 −90
3,000 30W 20cm 65 20
10,000 Cloudy 18 6
100,000 Fine weather 5 2
Condition A : Time required for full charge
Condition B : Time required for steady operation
Condition C : Time to charge 1 day of power
4. How to set the secondary battery unit
・Please set the exclusive secondary battery unit.
(The secondary battery is Titanium-lithium-ion battery without any environmentally harmful substances.)
・Please install the plus part of the secondary battery towards inside of the watch.
・
・Secondary battery unit guide must be connected to "Guide pole". (Refer to the Fig.[1] in below.)
・
・
・
・
B
(Approx.
Hours)
1
2.5
8
35
Cal. VS76A Attention-01 24/Apr./'15
Rev. : 01
A fluorescent lamp
Sun light
When installing or changing the secondary battery unit, it is recommended to remove three secondary
battery clamp screws first, then remove the secondary battery clamp not to damage the movement
parts.
If you install the secondary battery unit without removing the secondary battery clamp, please install
the secondary battery unit from [→] direction as illustrated below Fig.[1].
Check whether the secondary battery lead plate is surely connected to the secondary battery minus
pattern.
Install the secondary battery unit under the circuit block cover as illustrated below Fig.[1] and Fig.[2].
System-reset and adjusting the polarity of each step rotors is required as below after installing
secondary battery unit.
Short the circuit pattern “AC” to the secondary battery clamp for more than 2 seconds.
Short the circuit pattern “B” to the secondary battery clamp for more than 2 seconds.
Then, set the current time, set the 1/20 second chronograph hand, second chronograph hand and
minute chronograph hand at "0" position.
Fig.[2] A sectionFig.[1]
B
A
Guide pole
Secondary battery minus pattern
Secondary battery clamp
P. 9-01

Date :
5. How to remove the setting stem
・
・Please do not transform the Earth spring.
6. Attention of casing part structure
・
・Use the metal case to prevent from the movement mal-function by static electricity.
・
7.How to set the hands
・
・Do not turn the hand forcibly.
8.How to remove the hands
・When removing the hands, use exclusive fork-shaped tools.
・Do not remove the dial under the condition that any hands are set.
9. Caution
10. 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.
11. How to set the solar cell unit
Push above part of each hook on the solar cell unit into main plate certainly.
Use the specified dial support ring to prevent rotation of the movement inside of the case in order to
stabilize the button operation.
Refer to the [Solar cell unit] page instruction as to the shape and tolerance.
Each hand moves at step interval. Set the each hand at correct position according to the scale on the
dial in order not to make a mistake in reading time.
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.
When removing the setting stem, pull out the crown at 1st click position and then remove the setting
stem while pressing the hollow portion of setting lever by tweezers. (Refer to the Fig.[3].)
Cal. VS76A Attention-02 24/Apr./'15
Rev. : 01
The center wheel have a safety stopper structure to prevent the minute hand from being pressed too
much. However pay attention to the contact between hour hand and minute hand.
Earth spring
Fig.[3] Crown pulled out at 1st click
P. 9-02

Date :
12.How to set the dial
The dial is held by the four guide poles on the solar cell unit.
Cal. VS76A Attention-03 24/Apr./'15
Rev. : 00
P. 9-03

Date :
0 click 1st click
Crown Free Turn clockwise for date
change
2H button Chronograph Start/Stop
Restart
Chronograph Start/Stop
Restart
4H button
Chronograph Reset
Split
Split release
Chronograph Reset
Split
Split release
[*1] How to set the "0" position / System-reset (Crown position : 2nd click)
How to set the "0" position.
Pull crown out to the 2nd click position.
↓
Press 2H button for 2 seconds.
↓
Press 4H button repeatedly to set it to "0" position.
↓
Press 2H button for 2 seconds.
↓
Press 4H button repeatedly to set it to "0" position.
↓
Press 2H button for 2 seconds.
↓
Press 4H button repeatedly to set it to "0" position.
↓
Push crown back to normal position.
System-reset
Pull crown out to the 2nd click position.
↓
Press 2H and 4H buttons at the same time for longer than 2 seconds.
It is necessary to set the "0" position after system-reset.
Cal. Operation-01
24/Apr./'15
Rev. : 01
VS76A
Second chronograph hand turns a full round and can now be
set to correct "0" position.
Minute chronograph hand turns a full round and can now be
set to correct "0" position.
Press 2H button for 2 seconds here will allow you to resume the procedure again as
indicated by the arrow if necessary.
[*1]
2nd click
Time setting
[*1]
Crown position
1/20 second chronograph hand turns a full round and can
now be set to correct "0" position.
0 ® 1 ® 2
2H button
4H button
Minute hand
Second chronograph hand 1/20 second chronograph hand
Crown
Hour hand
Small second hand
Minute chronograph hand
P.10-01

Date :
Chronograph function
・The chronograph can measure up to 60 minutes in 1/20 second increments.
・
・When the measurement reaches 60 minutes, the chronograph automatically stops counting.
Standard measurement
Accumulated elapsed time measurement
Split time measurement
After the chronograph is started or restarted or split time is released, 1/20 second chronograph hand
moves about 1 minute and automatically stops at the "0" position.
When the measurement is stopped or split time is measured, it moves to indicate the elapsed 1/20
seconds.
Cal. Operation-02
24/Apr./'15
Rev. : 01
VS76A
Restart and stop of the chronograph
can be repeated by pressing 2H button.
Measurement and release of sprit time
can be repeated by pressing 4H button.
Start Stop Reset
2H button 2H button 4H button
Start Stop Restart
2H button 2H button 2H button 2H button 4H button
Start Split Split release
2H button 4H button 4H button 2H button 4H button
Stop Reset
ResetStop
P.10-02

Watch Movement Parts List and Disassemble Guide
MOVEMENT SPECIFICATIONS
Movement Size
Casing Diameter
Height
Running Time
Cal.VS76A
12’’’ 4.40mm
Ø27.0mm
Date
SOLAR SERIES
- 1/20 sec. chronograph
Minute
chronograph
Small second
1/20 second
chronograph
Approx. 6 months

Cal.VS76A
Parts List
零件一覧表
№ PARTS NAME CHINESE QTY VS76A1
(1) Train wheel bridge 夾板 1 0125 527
(2) Centre wheel & pinion 中心輪 1 0221 604
(3) Third wheel & pinion 3号輪 1 0231 580
(4) Fourth wheel & pinion 4號輪 1 0241 583
(5) Fifth wheel & pinion 5號輪 1 0701 581
(6) Step rotor 轉子 1 4146 710
(7) Rotor stator 轉子甲板/定子 1 4239 710
(8) Coil block 線圈 1 4002 541
(9) Centre wheel guerd 中心輪壓片 1 4283 581
(10) Hour wheel 時輪 1 0271 636
(11) Minute wheel 度數輪/分輪 1 0261 580
(12) Setting wheel 小鐵車/撥針輪 1 0281 580
(13) Clutch wheel 豬籠輪 1 0282 585
(14) Setting lever 押制竿 1 0383 592
(15) Yoke 橫擔 1 0384 583
(16) Train wheel setting lever 輪組止動竿 1 0391 591
(17) Circuit block 電路板 1 4000 779
(18) Conduction basal plate 導通基板 1 4224 518
(19) Circuit block cover 電路板蓋 1 4461 599
(20) Secondary battery unit 電池 1 3023 34T
(21) Second battery clamp 第二電池夾 1 4225 618
(22) Small second wheel & pinion 細秒針輪 1 0240 511
(23) Second wheel friction spring 計秒阻力簧 1 0396 580
(24) Minute counting wheel 分計齒輪 1 0902 500
(25) Intermediate minute counting wheel 分計中心輪 1 0950 590
(26) Step rotor for minute counting 轉子 1 4146 710
(27) Rotor stator for minute counting 分輪定子 1 4239 712
(28) Coil block for minute counting 分輪線圈 1 4002 542
(29) 1/20 Seconds counting wheel 1/20秒計齒輪 1 0902 500
(30) Intermediate wheel for 1/20 seconds counting 分計中心輪 1 0950 590
(31) Step rotor for 1/20 seconds counting 轉子 1 4146 710
(32) Rotor stator for 1/20 seconds counting 1/20秒計定子 1 4239 713
(33) Coil block for 1/20 seconds counting 1/20秒計線圈 1 4002 542
(34) Switch lever (A) 按制竿（A) 1 4450 703
(35) Switch lever (B) 按制竿（B) 1 4450 701
(36) Second counting wheel 秒計齒輪 1 0888 501
(37) 1st intermediate wheel for second counting 第一秒計過輪 1 0885 594
(38) 2nd intermediate wheel for second counting 第二秒計過輪 1 0885 595
(39) Step rotor for second counting 轉子 1 4146 710
(40) Rotor stator for second counting 秒計定子 1 4239 717
(41) Coil block for second counting 線圈 1 4002 541
(42) Intermediate wheel for calendar corrector cover 輪壓片 1 4288 500
(43) 1st intermediate wheel for calendar corrector 第一日期修正輪 1 0962 580
(44) 2nd intermediate wheel for calendar corrector 第二日期修正輪 1 0962 504
(45) 3rd intermediate wheel for calendar corrector 第三日期修正輪 1 0962 504
(46) Date corrector setting wheel 日曆修正輪 1 0737 505
(47) Date indicator guide board 日曆盤導向板 1 0712 507
(48) Date indicator driving wheel 日曆驅動輪 1 0802 580
(49) Date indicator 日曆盤 1 0878 ***
(50) Date indicator maintaining plate 日曆盤蓋 1 0808 523
(51) Solar cell lead terminal 太陽電池引極 2 4281 516
(52) Untransparent plate 太陽能透析板 1 4453 500
(53) Solar cell unit 太陽電池組件 1 4025 556
(54) Pin for train wheel bridge 夾板拖柱仔 1 0027 974
(55) Intermediate wheel for calendar corrector cover pin 輪掩蓋柱仔 1 0027 973
(56) Screw(A) 螺絲 3 0022 459
(57) Screw(B) 螺絲 3 0012 354
(58) Screw（C） 螺絲 3 0022 230
(59) Setting stem 柄軸/巴芯 1 0351 587

Cal.VS76A DISASSEMBLE CHART
Solar cell unit
Solar cell lead
terminal
Screw(B)
Date indicator
Date indicator
driving wheel
Screw(B)
Date indicator guide board
Date corrector setting wheel
Intermediate wheel for calendar corrector cover pin
Intermediate wheel for
calendar corrector cover
Hour wheel
1st Intermediate wheel for calendar corrector
3rd Intermediate wheel for calendar corrector
2nd Intermediate wheel for calendar corrector