Citizen 520 Instruction Manual page 12

[Chronograph Hand Zero Positioning]
1. Pull the crown out to the time correction position.
2. Press button (B) to position the chronograph second at the 0 position.
* The chronograph second hand can be advanced rapidly by depressing button
(B) continuously.
3. Once the chronograph second hand has been positioned at the 0 position, reset
the time and return the crown to the normal position.
4. Press button (A) to check that each of the chronograph hands has been reset to
the 0 position.
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