Citizen 0S21 Manual page 2

"A"
"A"
"A"
"B"
"B"
E) CHRONOGRAPH RESET(INCL. AFTER REPLACING BATTERY)
This procedure should be performed when the chronograph second hand does not return to zero position after
the chronograph has been reset, and including after the battery has been replaced.
1. Pull the crown out to the 2nd 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.