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