Citizen 0S80 Instructions Manual page 7

F) CHRONOGRAPH RESET (INCL. AFTER REPLACING BATTERY)
This procedure shoud be performed when the chronograph second hand and
chronograph 1/20 second hand do not return to the 0 second position after the
chronograph has been reset, and including after the battery has been replaced.
Chronograph
minute hand
Hour
hand
Chronograph
hour hand
Button C
1. Pull the crown out to the 2nd position.
2. Press button "A" to set the chronograph second hand to the 0 position.
3. Press button "B" to set the chronograph 1/20 second hand to 0 position.
The chronograph hands can be advanced rapidly by continuously pressing button
"A"or "B".
4. Once the hands have been zeroed, reset the time and return the crown to its
normal position.
5. Press button "B" to check that the chronograph hands are reset to the 0 position.
* Do not return crown to normal position while chronograph second hand and 1/20
chronograph second hand return to 12:00 (ZERO) position.
Each hands stop on the way when crown are returned to normal position and these
positions are recognized as 12:00 (ZERO) position.
G) FITTING METHOD OF HANDS
Place the module on case back shown in the figure and position the reference hand,
then fit the hands according to the following procedure.
CAL. 0S80
Chronograph
second hand
Second hand
or 1/20 sec
chronograph hand
Button A
Minute hand
Normal crown
position
Button B
Alarm hand
Calendar