Citizen 0S21 User manual

CHRONOGRAPH FUNCTION: CENTER SECOND HAND CHRONOGRAPH 1/1 sec.
A) DISPLAYS AND BUTTONS
B) SETTING THE TIME
C) SETTING THE DATE
D) USING THE CHRONOGRAPH
E) CHRONOGRAPH RESET( INCL. AFTER REPLACING BATTERY)
A) DISPLAYS AND BUTTONS
B) SETTING THE TIME
1. Pull the crown out to the 2nd click position.
2. Turn the crown to set hour and minute hands.
C) SETTING THE DATE
1. Pull the crown out to the 1st click position.
2. Turn the crown anticlockwise 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 the Normal position.
Cal. 0S21 Instruction manual
Chronograph
second hand
Button A
Button B
Minute hand
2nd Click Position
1st Click Position
Normal Position
Calendar
Chronograph
minute hand
Hour hand
24hour hand

D) USING THE CHRONOGRAPH
This chronograph is able to measure and display time in 1/1 second united up to maximum of
59 minutes 59 seconds.
Measuring time with the chronograph
1. The chronograph can be started and stopped each time button "A" is pressed.
2. Pressing button "B" resets the chronograph and the chronograph second hand,
chronograph minute hand, an chronograph hour hand return to zero position.
E) CHRONOGRAPH RESET (INCL. AFTER REPLACING BATTERY)
This procedure shoud be performed when the chronograph second hand does not return to
the zero position after the chronograph has been reset to zero position,
and including after the battery has been replaced.
1. Pull the crown out to the 2nd Click Position.
2. Press button "A" to set the chronograph second hand to zero position.
The chronograph hand can be advanced rapidly by continuously pressing button "A".
3. Once the hand have been reset to zero position,
push the crown back to the normal position.
* Do not push the crown to normal position while the chronograph second hand returns to
zero position. It stops on the way when the crown are returned to normal position and
its position is recognized as zero position.
These specifications might be changed without prior notice.
Reset
Time
Stop
"A"
"B"
"A"
"A"
"B"
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