Casio SF-5580 Owner's Manual page 4

5. Press the RESET button on the back of the Digital Diary with a thin, pointed
object.
RESET
button
6. Press Y.
7. Press OK to reset the Digital Diary or ESC to abort.
At this time the message "SET TIME!" appears.
After about two seconds, the Home Time screen appears.
8. Press FUNC, select "Time set", and then use the procedure on page 18 to set the
Home Time.
If you turn power off without setting the Home Time, the "SET TIME!" message
appears the next time you turn power on. The Digital Diary will not operate
properly until you set the Home Time.
Important!
Turn on the unit at least once a month to check the current condition of the
batteries.
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RESET