JRC JCY-1900 Instruction Manual page 108

Chapter 4 Operation Method
4. Tapping the [Release] button, then the PASSWORD INPUT screen is displayed.
5. Enter the password and tap the [Enter] button. The preserved data is released, and the
successful completion message is displayed.
[Information]
The factory default password is "0000". Manage the password by the ship administrator.
About how to enter a number, see "4.1.5 Number input".
Completion message
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DATA PROTECT screen
PASSWORD INPUT screen
Figure 4-67 [Release] button
Figure 4-68 Release preserved data