Casio SF-4990 User Manual page 16

PART 1 Getting Started
If this is the first time you ever turned on the SF Unit...
Perform the RESET procedure under "Before using the unit for the first time" on
page 1, starting from step 9.
If this is not the first time you are using the SF Unit...
There is probably a problem with the data in memory (data error). Note that once
data is lost it cannot be recovered. Such data errors are generally caused by one
of the following problems.
•
Interruption of battery power.
•
Severe electrostatic charge, impact, change in temperature, or change in
humidity.
•
Hardware problem.
After a data error is discovered, you will not be able to input or edit data. In order
to return memory to normal (allowing further input and editing of data), you must
perform the RESET operation to clear the memory of all data.
"THE RESET OPERATION DELETES ALL DATA IN MEMORY! DO YOU
WANT TO CONTINUE?"
Press to reset the unit.
ENTER
If you still have trouble after trying the RESET operation, you may have a
hardware problem. If so, consult with your nearest CASIO dealer.
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