Jacques Lemans U-32 Manuel D'instructions page 7

Functions of the chronograph:
1. Starting and stopping of the time measurement by pusher A.
2. reset to zero of the chronograph hands by pusher B.
By repeating of point 1 several time measurements can be added.
Adjusting the chronograph:
This procedure should be performed when the chronograph
second hand do not return to the 0 second position after the
chronograph has been reset, and including after the battery has
been replaced.
1. Pull crown to position 3.
2. Press A to reset the chronograph second hand to zero.
3. Press B to reset the chronograph minute and hour hands.
4. reset the watch to the current time and return the crown to
its normal position.
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