- 4 -
CHRONOGRAPH OS10 (without date: OS30)
Time Setting
1. Pull crown out to position 3.
2. Turn crown to set the desired time.
3. Return crown to position 1.
Date Setting
1. Pull crown out to position 2.
2. Turn crown clockwise until the correct date is shown in the date window.
3. Return crown to position 1.
Chronograph Operation
1. Press A to start/stop the chronograph.
2. Press B for reset.
Adjusting The Chronograph
1. Pull crown to position 3.
2. Press A to reset the second hand to “0.”
3. Press B to reset the chronograph minute and hour hands.
4. Reset the watch to the current time and return crown to position 1.
A
B
123
MINUTE HAND
HOUR HAND
SECOND HAND
DATE
CHRONOGRAPH OS20 / OS21
Time Setting
1. Pull crown out to position 3. Chronograph second hand will return to “0.”
Do not return the crown to position 1 while the hands are returning to “0,” or else the position the
hands are at when this is done will be recognized as the new “0” position.
2. Turn crown to set the desired time.
3. Return the crown to position 1.
Date Setting
1. Pull crown out to position 2.
2. Turn crown counter-clockwise until the correct date is shown in the date window.
3. Return crown to position 1.
Chronograph Zero Reset
This procedure should be performed when the chronograph second hand does not return to the “0”
position after the chronograph has been reset.
1. Pull crown out to position 3.
2. Press A to set the chronograph second hand to the “0” position.
NOTE: The hands move quickly if the pushers are kept pressed.
3. Once the hand has been zeroed, reset the time and return the crown to position 1.
Do not return the crown to position 1 while the hands are returning to “0.” Doing so will cause the
position of the hands to be recognized as the new “0” position.
Chronograph Operation
This chronograph is able to measure and display time in 1/1 second up to maximum of 1 hour.
1. Press A to start/stop the chronograph.
2. Press B to reset the chronograph.
123
A
B
123
A
B
CHRONOGRAPH
MINUTE HAND
CHRONOGRAPH
MINUTE HAND
24-HOUR HAND
24-HOUR HAND
CHRONOGRAPH
SECOND HAND
CHRONOGRAPH
SECOND HAND
SECOND HAND
DATE
DATE
OS20
OS21
CHRONOGRAPH STOPWATCH JS25, vD53
Setting the Time
1. Pull the crown out to position 3.
2. Turn the crown to set hour and minute hands.
3. After the time has been set, push the crown back to position 1.
Setting the Date
1. Pull the crown out to position 2.
2. Turn the crown clockwise to set the date.
• If the date is set between the hours of around 9:00 PM and 1:00 AM, the date may not change on the
following day.
3. After the date has been set, push the crown back to position 1.
Using the Chronograph
1. Press A to start/stop the chronograph.
2. Press B to reset the chronograph to zero.
Chronograph Reset (including after replacing the battery)
This procedure should be performed when the stopwatch second or minute hand does not return to the
zero position.
1. Pull the crown out to position 3.
2. Press A to set the chronograph second hand forward. Press B to set the chronograph second hand
backward.
• The chronograph minute hand is synchronized with the chronograph second hand.
• The chronograph second hand can be advanced rapidly by continuously pressing A or B.
3. Once both hands have been set to zero, reset the time and return the crown to position 1.
123
A
B
CHRONOGRAPH
SECOND HAND
CHRONOGRAPH
MINUTE HAND 24-HOUR HAND
DATE