Epson YM26A Guida

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. :

CAL. YM26A

Analog Quartz 12''' World time & Alarm Movement

1. MOVEMENT DIMENSIONS

Outside diameter

27.60mm(12H-6H)

24.00mm(3H-9H)

Casing diameter

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

－

℃

＋

℃

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

・

World time minute hand

: 0.03

・

World time hour hand

: 0.025

・

Alarm minute hand

: 0.03

・

Alarm hour hand

: 0.025

・

City hand

: 0.06

・

Minute hand

: 0.70

・

Moment of inertia

City hand

: less than 0.2

・

m²

5. BATTERY

Type / Size

Silver oxide battery /

9.5mm

t 2.73mm

Recommended battery

SR927W

Nominal voltage

1.55 V

Battery life

Approx. 3 years

Driving current consumption

Approx. 0.80

Operation stopping voltage

0.9 V

6. SEPARATED PARTS (Parts code)

Hand setting stem

0351584 (

90)

、

0351585 (

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

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