Toa D-901 KR - Manual (Page 75)

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[Protect settings]
Select [Option
→ Protect Settings] from the menu. A dialog for protect setting is then displayed.
• Click each setting button to turn on or off the protect function. The dented button position indicates ON, and
the raised position indicates OFF.
• Click the [All keys] button to turn on the protect function for all key operations.
• Select "LOCK" to enable the protect function.
• Select "UNLOCK" to disable the protect function.