Key Lock; Releasing Key Lock - Citizen SA-SD Operation Manual

5-8 Key Lock

Hold down the ENTER and EXIT keys simultaneously for three seconds.
The display will show LOCK ON, and display will then return automatically to the basic
screen.
For reference
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LOCK ACT will be displayed when any key is pressed.
The external input function will still be in effect.

5-9 Releasing Key Lock

Hold down the ENTER and EXIT keys simultaneously
LOCK ACT will be displayed. Continue pressing the keys.
When LOCK OFF is displayed, release the keys.
5- 9