Epson YM26A Guide

Watch Movement Specification and Drawing
WORLD TIME & ALARM
Cal. YM26A
Movement Size
Casing Diameter
Height
Battery Life
12’’’
Ø27.0mm
3.7mm
3 years

Date: 30/Jan./'15
Cal. YM26A
Items Rev. Page
Specifications 01 1
Appearance 01 2
Casing 01 3
Hand fitting 01 4
Hand setting stem 01 5
Magnetic shield plate 01 6
Dial-01 01 7-01
Dial-02 01 7-02
Holding ring for dial-01 02 8-01
Holding ring for dial-02 02 8-02
Attention for assembly 01 9
Attention of casing part structure-01 01 10-01
Attention of casing part structure-02 00 10-02
Attention of design 00 11
Operation-01 01 12-01
Operation-02 01 12-02

MOVEMENT SPECIFICATIONS
Date :
31/Aug./'12
Rev. :
00
CAL. YM26A
Analog Quartz 12''' World time & Alarm Movement
1. MOVEMENT DIMENSIONS
Outside diameter
φ
27.60mm(12H-6H)
×
24.00mm(3H-9H)
Casing diameter
φ
27.00mm(12H-6H)
Total height
3.70mm (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 hand / Minute hand / City hand (Center)
Small hands
World time hour and minute hand (12H)
Alarm hour and minute hand (6H)
Small second hand (9H)
Calendar
Instant setting device for date calendar
Reset switch
System-reset switch
Power depletion warning function (BLD)
(Small second hand moves at 2-second intervals)
Setting mechanism
Crown at normal position : Free
Crown pulled out 1st click : Instant date change
Crown pulled out 2nd click : Time setting / Reset
: World time setting / Alarm time setting
World time
2H button: City set (clockwise)
4H button: City set (counterclockwise)
4. FEATURES
Jewels
0 Jewels
Anti-magnetism
Over 1600A/m (Direct current magnetic field)
Maximum unbalance of hands
Small second hand
: 0.03
μ
N
・
m
World time minute hand
: 0.03
μ
N
・
m
World time hour hand
: 0.025
μ
N
・
m
Alarm minute hand
: 0.03
μ
N
・
m
Alarm hour hand
: 0.025
μ
N
・
m
City hand
: 0.06
μ
N
・
m
Minute hand
: 0.70
μ
N
・
m
Moment of inertia
City hand
: less than 0.2
µ
g
・
m²
5. BATTERY
Type / Size
Silver oxide battery /
φ
9.5mm
×
t 2.73mm
Recommended battery
SR927W
Nominal voltage
1.55 V
Battery life
Approx. 3 years
Driving current consumption
Approx. 0.80
μ
A
Operation stopping voltage
0.9 V
6. SEPARATED PARTS (Parts code)
Hand setting stem
0351584 (
φ
90)
、
0351585 (
φ
90_Long)
Magnetic shield plate
4259509
Holding ring for dial
0866650 (standard) 0866789 (special)
Battery
SR927W
A.C. comment seal
0110705
Piezoelectric element
4589801
7. TEST OF ACCURACY
Equipment to be used
SEIKO quartz tester QT-99, QT2100
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

YM26A Attention for assembly
1.How to change the battery
•Please use the exclusive battery to keep the stable performance for a long time.
•Please set the battery with the minus part toward the inside of the watch.
•When you assemble or change the battery, it is recommended to pull out three battery
clamp screws first, and then take out the battery clump in order not to add the damage to
the movement part.
•When you assemble the battery without taking out the battery clamp, please refer to the
picture in below and set the battery from the [→] direction.
•Regarding the [A] part of the following chart, it is recommended that the battery must be
under the circuit holder.
•It is necessary to do system-reset. After assembling the battery, please short the circuit
pattern “AC”and the battery clamp for more than 2 seconds.
•Please set the world time hour / minute , Alarm hour / minute hand at “0”position.
2.How to pull out the stem
•Please pull out the crown at 1st click and then pull out the stem while you are pressing the
hollow part of the setting lever by tweezers. If the stem is not at 1st position, it is
impossible to be pulled out. (Crown pulled out at 1st click)
3.Attention to set each hand
•Hand moves at one-second interval. Please set the each hand at correct position
according to the scale of the dial in order not to make a mistake.
•Please do not turn the hour hand forcibly.
4.How to take off the hand
•When you take off the hand, please use the fork-shaped exclusive tools.
•Please do not take off the dial when any hands are assembled.
5.How to test the accuracy
•Measure the timing with Quartz Tester in 10 seconds gate.
Date: 31/Aug./'12
Rev.: 00
P. 9
Battery clamp Circuit block cover
Battery
A section
A

Date :
1.Minute hand
2.Holding ring for dial
3.Case
4.Hour wheel
5.Magnetic shield plate
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.
Install magnetic shield plate on the movement(on battery clamp) before assembling the case back.
Refer to the following picture not to install magnetic shield plate incorrect direction.
Cal. YM26A Attention of casing part structure-01
30/Jan./'15
Rev. : 01
When set and remove the hour hand repeatedly, it may reduce the hand fixing torque because the
hour wheel is made by plastic.
To ensure the enough fixing torque, it isn't recommended to re-assemble the hour hand more than five
times.
Use the specified holding ring for dial to prevent rotation of the movement inside of the case in order to
stabilize the button operation.
Refer to the [Holding ring for dial] page instruction as to the shape and tolerance.
Use the metal case to prevent from the movement mal-function by static electricity.
Magnetic shield plate Movement
P.10-01

Date :
6.Piezoelectric element , A.C. comment seal
Stick piezoelectric element and A.C. comment seal to the center of case back.
(1) Piezoelectric element
Piezoelectric element must be stuck to case back by thermoplastic adhesive.
Thermoplastic adhesive is already printed to the surface of piezoelectric element.
Heating temperature and time to stick piezoelectric element is shown in the following table.
Material of case back Heating temperature
Stainless 250℃
Titanium 250℃
Check piezoelectric element is definitely stuck to case back after heating.
(2) Sticking position
: 0.35mm and less
: 0.50mm and less
6 seconds
The amount of the misalignment between the center of piezoelectric
element and A.C. comment seal
If the sticking position of piezoelectric element and A.C. comment seal is drastically misaligned or if the
electrical continuity is bad, no sound may occur.
The amount of the misalignment between the center of case back and
piezoelectric element
Heating time
5 seconds
Cal. YM26A Attention of casing part structure-02
30/Jan./'15
Rev. : 00
・
・
Case back
Piezoelectric element : φ18mm
A.C. comment seal : φ10mm
P.10-02

Date :
The design instruction of the city
The time in 24 cities is displayed.
The each interval of city is 15 degree.
When designing a dial, it has to be checked whether time difference has been changed.
(Time difference at 2015/1)
Display position Difference in hour
from UTC Representative city
0±0 UTC / LONDON
1 +1 PARIS / ROME
2 +2 CAIRO
3 +3 JEDDAH
4 +4 DUBAI
5 +5 KARACHI
6 +6 DHAKA
7 +7 BANGKOK
8 +8 BEIJING
9 +9 TOKYO
10 +10 SYDNEY
11 +11 NOUMEA
12 +12 WELLINGTON
13 -11 MIDWAY
14 -10 HONOLULU
15 -9 ANCHORAGE
16 -8 LOS ANGELES
17 -7 DENVER
18 -6 CHICAGO
19 -5 NEW YORK
20 -4 SANTIAGO
21 -3 RIO DE JANEIRO
22 -2 -
23 -1 AZORES
Cal. Attention of design
30/Jan./'15
Rev. : 00
YM26A
P.11

Date :
0 click 1st click
Crown Free Turn clockwise for date
change
2H button World time city setting
(Clockwise)
Sound demonstration
(more than 2 seconds)
4H button World time city setting
(Counterclockwise)
Alarm time setting
(at 6H small circle)
[*1] World time and alarm time setting / System-reset (Crown position : 2nd click)
How to set the world time and alarm time setting
Pull crown out to the 2nd click position.
↓
↓
Press 2H button for 2 seconds.
↓
Press 4H button repeatedly to set the city hand.
↓
Press 2H button for 2 seconds.
↓
Press 4H button repeatedly to set the world time hands.
↓
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 world time, city and alarm time after system-reset.
City hand turns a full round and can be set to the city.
World time hands turns a full round and can be set the world time
hands to the time of selected city.
Press 2H button for 2 seconds here will allow you to resume the procedure again as
indicated by the arrow if necessary.
Press 4H button repeatedly to set the alarm hands.
Crown position
2nd click
Time setting
[*1]
[*1]
Alarm time hands turn a full round and can be set to the time the main
time hands indicates.
Cal. YM26A Operation-01
30/Jan./'15
Rev. : 01
0 ® 1 ® 2
2H button
4H button
Minute hand
City hand
World time minute hand
Alarm hour hand
Crown
World time hour hand
Alarm minute hand
Hour hand
Small second hand
P.12-01

Date :
World time function
・The time in 24 cities is displayed by the 24 hour indication.
・Press the 2H or 4H button until the city hand points to the city whose time you wish to know.
Alarm function
・The alarm can be set to ring only once at a designated time within the coming 12 hours.
・The alarm time can be set in one minute increments.
Set the alarm time
Stop the alarm
・At the designated time the alarm rings for 20 seconds, and it is automatically disengaged as it stops.
It is possible to stop ringing manually when pressing any button.
Cancel the alarm (when alarm time is set)
Alarm sound demonstration
Cal. YM26A Operation-02
30/Jan./'15
Rev. : 01
Pull out
1st. position
Set the alarn time
[*1]
Push back
Normal position
Crown 4H button Crown
[*1]
Press 4H button repeatedly to set the alarm hands to the desired alarm time.
The alarm hands move quickly when the 4H button is kept pressed. They stop when the hands reach to the current time.
Release and press the 4H button, the alarm hands will start moving again.
Pull out
1st. position
Cancel the alarm
[*2]
Push back
Normal position
Crown 4H button Crown
[*2]
Press and hold 4H button until alarm hands stop and indicate the current time.
Pull out
1st. position
Alarm sound
demonstration
[*3]
Push back
Normal position
Crown 2H button Crown
[*3]
Press and hold 2H button for longer than 2 seconds.
The alarm sound can be heard while the button is kept pressed.
P.12-02

Watch Movement Parts List and Disassemble Guide
MOVEMENT SPECIFICATIONS
Movement Size
Casing Diameter
Height
Battery Life
Cal.YM26A WORLD TIME & ALARM
- World time
- Alarm
12’’’ 3.7mm
3 years
Ø27.0mm
World time
Small second
DateAlarm

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P制按擔控 彈制市E 向夾I彈E控E Q擔橫 橫市2（制1
擔芯片秒罩 表示ee組 b芯秒界ge
󱭮󲦯
1
0125 509
向e罩蓋e芯 表示ee組 & p秒罩秒耐罩
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1
0221 583
擔示秒芯界 表示ee組 & p秒罩秒耐罩
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1
0231 580
圧耐號芯蓋示 表示ee組 & p秒罩秒耐罩
4󴢏󵅚
1
0241 583
圧秒盤蓋示 表示ee組 & p秒罩秒耐罩
5󴢏󵅚
1
0701 581
控蓋ep 芯耐蓋耐芯
󵅹󱶀
1
414（ 710
按耐蓋耐芯 s蓋片蓋耐芯
󵅹󱶀󳝢󲦯/󱷊󱶀
1
4239 710
向耐秒組 b組耐c籠
󴀊󱤸
1
4002 700
向e罩蓋e芯 表示ee組 sp芯秒罩g
󱁝󲇳󵅚󲅸󲅃
1
4283 581
市秒罩號蓋es 表示ee組
󲃖󲞨󵅚/󱐶󵅚
1
02（1 580
夾耐號芯 表示ee組
󲡲󵅚
1
0271 588
控e蓋蓋秒罩g 表示ee組
󱸿󵙥󵃺/󲛕󵐍󵅚
1
0281 580
向組號蓋c示 表示ee組
󴺜󳺐󵅚
1
0282 585
控e蓋蓋秒罩g 組eve芯
󲓬󱑦󳴯
1
0383 592
橫耐籠e
󲲛󲜄
1
0384 583
擔芯片秒罩 表示ee組 se蓋蓋秒罩g 組eve芯
󵅚󳽴󲶒󱔅󳴯
1
0391 591
向秒芯c號秒蓋 b組耐c籠
󵤫󵀟󲦯
1
4000 （19
向耐罩界號c蓋秒耐罩 b片s片組 p組片蓋e
󱸾󵉊󱨪󲦯
1
4224 514
控ec耐罩界s 表示ee組 盤芯秒c蓋秒耐罩 sp芯秒罩g
󴰸󳰂󵡫󱓋󳹗
1
039（ 580
向秒芯c號秒蓋 c耐ve芯
󵤫󵀟󲦯󴛻
1
4457 980
動片蓋蓋e芯計 c耐罩罩ec蓋秒耐罩(-)
󴻐󲮥󳑷
1
4270 710
動號zze芯 組e片界 蓋e芯線秒罩片組
󵨯󵵗󳑷󲅅󲮥
1
424（ 527
動片蓋蓋e芯計 c組片線p
󵤫󲺐󱭮
1
4225 （（3
控線片組組 sec耐罩界 表示ee組 & p秒罩秒耐罩
󳽠󳰂󵐍󵅚
1
0240 580
向e罩蓋e芯 表示ee組 sp芯秒罩g
󱁝󲇳󵅚󲅸󲅃
1
039（ 580
制組片芯線 ce罩蓋e芯 表示ee組
󵨯󵵗󱁝󲇳󵅚
1
0270 582
制組片芯線 秒罩蓋e芯線e界秒片蓋e 表示ee組
󵨯󵵗󱐶󵅚
1
0950 590
控蓋ep 芯耐蓋耐芯 盤耐芯 片組片芯線
󵨯󵵗󵅹󱶀
1
414（ 710
按耐蓋耐芯 s蓋片蓋耐芯 盤耐芯 片組片芯線
󵨯󵵗󱷊󱶀
1
4239 712
向耐秒組 b組耐c籠 盤耐芯 片組片芯線
󵨯󵵗󴀊󱤸
1
4002 711
制組片芯線 線秒罩號蓋es 表示ee組
󵨯󵵗󱐶󵅚
1
02（1 582
制組片芯線 示耐號芯 表示ee組
󵨯󵵗󲡲󵅚
1
0271 583
控表秒蓋c示 組eve芯 (制)
󲔹󱑦󳴯󰦅
制
󰦆
1
4450 703
控表秒蓋c示 組eve芯 (動)
󲗗󱑦󳴯󰦅
動
󰦆
1
4450 701
柱耐芯組界 蓋秒線e ce罩蓋e芯 表示ee組
󱁆󳝼󲡲󵟃󱁝󲇳󵅚
1
0270 582
柱耐芯組界 蓋秒線e 秒罩蓋e芯線e界秒片蓋e 表示ee組
󱁆󳝼󲡲󵟃󵉾󵅚
1
0950 590
控蓋ep 芯耐蓋耐芯 盤耐芯 表耐芯組界 蓋秒線e
󱁆󳝼󲡲󵟃󵅹󱶀
1
414（ 710
按耐蓋耐芯 s蓋片蓋耐芯 盤耐芯 表耐芯組界 蓋秒線e
󱁆󳝼󲡲󵟃󱷊󱶀
1
4239 713
向耐秒組 b組耐c籠 盤耐芯 表耐芯組界 蓋秒線e
󱁆󳝼󲡲󵟃󴀊󱤸
1
4002 711
柱耐芯組界 蓋秒線e 線秒罩號蓋e 表示ee組
󱁆󳝼󲡲󵟃24󱐶󵅚
1
02（4 580
柱耐芯組界 蓋秒線e 24示耐號芯 表示ee組
󱁆󳝼󲡲󵟃24󲡲󵅚
1
0278 581
向秒蓋計 秒罩界秒c片蓋耐芯 表示ee組
󱧾󲀲󵅚
1
0888 582
1s蓋 c秒蓋計 秒罩界秒c片蓋耐芯 秒罩蓋e芯線e界秒片蓋e 表示ee組
󳵜󱀰󱧾󲀲󵉾󵅚
1
0885 594
2罩界 c秒蓋計 秒罩界秒c片蓋耐芯 秒罩蓋e芯線e界秒片蓋e 表示ee組
󳵜󱂼󱧾󲀲󵉾󵅚
1
0885 595
控蓋ep 芯耐蓋耐芯 盤耐芯 c秒蓋計
󱧾󲀲󵅹󱶀
1
414（ 710
按耐蓋耐芯 s蓋片蓋耐芯 盤耐芯 c秒蓋計
󱧾󲀲󱷊󱶀
1
4239 711
向耐秒組 b組耐c籠 盤耐芯 c秒蓋計
󱧾󲀲󴀊󱤸
1
4002 700
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󲠕󲣖󳤔󱤪󱷊󳑷
1
0808 580
D片蓋e 秒罩界秒c片蓋耐芯
󲠕󲣶󱸾󱙁󳤔
1
0878 ***
D片蓋e 界芯秒ve 表示ee組
󲠕󲣶󵱵󱔅󳤔
1
0802 580
向片組e罩界片芯 c耐芯芯ec蓋耐芯 se蓋蓋秒罩g 蓋芯片罩s線秒ss秒耐罩 表示ee組
󲠕󲣖󵉾󵅚
1
09（2 580
D片蓋e c耐芯芯ec蓋耐芯 表示ee組
󲠕󲣶󱈞󲶓󵅚
1
0737 580
圧秒x秒罩g p秒罩 盤耐芯 蓋芯片秒罩 表示ee組 b芯秒界ge
󱭮󲦯󲔆󲨡󱄄
1
0027 974
P秒罩 盤耐芯 界片蓋e 秒罩界秒c片蓋耐芯 線片秒罩蓋片秒罩秒罩g p組片蓋e
󲠕󲣶󱸾󱙁󳤔󲨡󱄄
2
0027 973
控c芯e表(制)
󴧪󳾢
3
0022 230
控c芯e表(動)
󴧪󳾢
3
0022 459
動片蓋蓋e芯計
󵤫󲺐
1
3013 250
控e蓋蓋秒罩g s蓋e線(s蓋片罩界片芯界)
󲧴󵄨/󲀤󴓟
1
0351 584
控e蓋蓋秒罩g s蓋e線(組耐罩g)
󲧴󵄨/󲀤󴓟
1
0351 585
市片g罩e蓋秒c s示秒e組界 p組片蓋e
󴉀󳫱󲦯
1
4259 519
制 向 c耐線線e罩蓋 se片組 制 向󲱉󳭪 1 0110 705
P秒ez耐e組ec蓋芯秒c e組e線e罩蓋 󱥗󵤫󳽐󱶀 1 4589 801
夾耐組界秒罩g 按秒罩g 盤耐芯 D秒片組 (s蓋片罩界片芯界󰦆 󲠕󲣖󳤔󱷊󱅽󴆙 1 08（（ （50
夾耐組界秒罩g 按秒罩g 盤耐芯 D秒片組 (spec秒片組󰦆 󲠕󲣖󳤔󱷊󱅽󴆙 (1) 08（（ 789