Casio PV-200 Secret Function - Manual (Page 5)

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Chapter 7 Secret Function
3. Tap the Menu Bar icon to display the menu bar, and then tap Edit – To
secret area.
4. Input the correct password and then tap Set.
•
You do not need to input the password if you have entered the secret
memory area since you last turned on power.
5. Tap Yes to transfer the data.