Epson YM04A Watch Movement Specification And Drawing page 13

Cal.
YM04A
Chronograph function
・ The chronograph can measure up to 60 minutes in 1/5 second increments, capable of timing 12 hours.
・ When the measurement reaches 12 hours, the chronograph automatically stops counting.
Standard measurement
2H button
Start
Accumulated elapsed time measurement
2H button
Start
Split time measurement
2H button
Start
Operation-02
2H button
Stop
2H button
Stop
4H button
Split
Measurement and release of split time
can be repeated by pressing 4H button.
4H button
Reset
2H button 2H button
Stop
Restart
Restart and stop of the chronograph
can be repeated by pressing 2H button.
4H button 2H button
Split release Stop
Date : 31/Jul./'14
Rev. : 01
4H button
Reset
4H button
Reset
P.10-02