Epson YM82A Guide

Watch Movement Specification and Drawing
CHRONOGRAPH
Cal. YM82A
Movement Size
Casing Diameter
Height
Battery Life
12’’’
Ø27.0mm
3.7mm
3 years

Date: 30/Jan./'15
Cal. YM82A
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 10
Attention of dial design 01 11
Operation-01 01 12-01
Operation-02 01 12-02

Date :
1. MOVEMENT DIMENSIONS
Outside diameter
φ
27.60mm (12H-6H)
×
24.00mm (3H-9H)
Casing diameter
φ
27.00mm (12H-6H)
Total height
3.7mm (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 (Center)
Small hands
1/100 second chronograph / 1/10 second chronograph (12H)
40 minute chronograph (6H) / Small second (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)
Chronograph
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
1/100 second chronograph hand
: 0.005
μ
N
・
m
1/10 second chronograph hand
: 0.025
μ
N
・
m
40 minute chronograph hand
: 0.03
μ
N
・
m
Second chronograph hand
: 0.06
μ
N
・
m
Minute hand
: 0.70
μ
N
・
m
Moment of Inertia
Second chronograph 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
(120 minutes chronograph operation per day)
Driving current consumption
Approx. 0.80
μ
A
Operation stopping voltage
0.9 V
6. SEPARATED PARTS (Parts code)
Hand setting stem
0351584 (Standard) or 0351585 (Long)
Holding ring for dial
0866650 (Standard) or 0866789 (Special)
Battery
SR927W
Magnetic shield plate
4259519
A.C. comment seal
0110705
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.
Cal.
Rev. : 01
30/Jan./'15
YM82A Specifications
Analog Quartz 12''' Center second Chronograph Movement
The chronograph can measure up to 41 minutes in 1/100 second
increments, capable of timing 120 minutes.
P. 1

Date :
1.How to replace the battery
・Please use the specified battery to keep the stable performance for a long time.
・Please install the minus part of the battery towards inside of the watch.
・
・Install the battery under the circuit cover as illustrated below Fig.[1] and Fig.[2].
・
2.How to remove the stem
3.How to set the hands
・
・Do not turn the hand forcibly.
4.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.
5.How to test the accuracy
When measuring the time accuracy, use specified Quartz Tester and change the gate time in 10 seconds.
When removing the stem, pull out the crown at 1st click position and then remove the stem while
pressing the hollow portion of setting lever by tweezers. (Refer to the Fig.[3].)
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 installing or changing the battery, it is recommended to remove three battery clamp screws first,
then remove the battery clamp not to damage the movement parts.
If you install the battery without removing the battery clamp, please install the battery from [→] direction
as illustrated below Fig.[1].
System-reset is required as below.
After installing battery, short the circuit pattern “AC” to battery clamp for more than 2 seconds.
Then, under time setting condition, set 1/100 second chronograph / 1/10 second chronograph hand,
second chronograph hand and 40 minute chronograph hand at "0" position.
Cal. YM82A Attention for assembly
30/Jan./'15
Rev. : 01
Battery
Battery clamp Circuit cover
Fig.[2] A section
A
Fig.[1]
Fig.[3] Crown pulled out at 1st click
P. 9

Date :
1.Minute hand
2.Holding ring for dial
3.Case
4.Hour wheel
5.Magnetic shield plate
6. A.C. comment seal
Stick A.C. comment seal to the center of case back.
Sticking position
: 0.50mm and lessThe amount of the misalignment between the center of case back and A.C.
comment seal
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. YM82A Attention of casing part structure
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
Case back
A.C. comment seal : φ10mm
・
P.10

Date :
1.The index design instruction of chronograph hand
(1) Chronograph function
(2) Set to "0" position
(3) Dial index design
Index height : 50 and less
2.The start position of chronograph hand
When the chronograph function is activated, the 40 minute chronograph hand moves 240 degrees
from the start point.
The start position of the 40 minute chronograph hand can be set on the arbitrary positions in the range
of 360 degrees.
Cal. Attention of dial design
30/Jan./'15
Rev. : 01
YM82A
When the 40 minute chronograph hand set to "0" position, the 40 minute chronograph hand turns
a full round.
The dial index must be designed on the assumption that the 40 minute chronograph hand turns a
full round.
(Dial)
(Index)
50 and less
40 minute chronograph hand
P.11

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 [*2]
Split
Split release
Chronograph Reset
Split
Split release
[*1] "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.
[*2] How to view the demonstration (Crown position : 0 click)
Reset the chronograph, press 4H button for 3 seconds.
Press 2H button for 2 seconds here will allow you to resume the procedure again as
indicated by the arrow if necessary.
1/100 second chronograph and 1/10 second chronograph hands turns a full
round and can now be set to correct "0" position.
Second chronograph hand turns a full round and can now be set to correct
"0" position.
40 minute chronograph hand turns a full round and can now be set to correct "0" position.
[*1]
2nd click
Time setting
[*1]
Crown position
Cal. Operation-01
30/Jan./'15
Rev. : 01
YM82A
0 ® 1 ® 2
2H button
4H button
Minute hand
Second chronograph hand
40 minute chronograph hand
Crown
Hour hand
Small second hand
1/100 second chronograph hand
1/10 second chronograph hand
P.12-01

Date :
Chronograph function
・
・When the measurement reaches 120 minutes, the chronograph automatically stops counting.
Each hand stops at following position.
1/100 second chronograph hand : Stop at 0 position
1/10 second chronograph hand : Stop at 0 position
Second chronograph hand : Stop at 0 position
40 minute chronograph hand : Stop at 40 minute position
・
・
Standard measurement
Accumulated elapsed time measurement
Split time measurement
Indicator of 1/100 second chronograph and 1/10 second chronograph hands
How to view the 1/100 second chronograph hand display
The left side picture shows 0.82 second.
The chronograph can measure up to 41 minutes in 1/100 second increments, capable of timing 120
minutes.
After the chronograph is started or restarted or split released, the 1/100 second chronograph and
1/10 second chronograph hands move for 3 minutes and automatically stop at the “0” position.
(counting continues inside.)
40 minute chronograph hand
When the minute counting reaches 41 minutes, the hand immediately returns and continues
counting from "1" position and again after 120 minutes. (40 minutes x 3 times)
Cal. Operation-02
30/Jan./'15
Rev. : 01
YM82A
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
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.
P.12-02