RND 320-KA3305P USER MANUAL
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6 Keyboard Lock
Press and hold the voltage adjustment knob for 3 seconds, and then the front
panel will be locked; press and hold it again for 3 seconds, and then it will be
unlocked.
7 Beep ON/OFF
Press and hold the current adjustment knob for 3 seconds, and then the beep will
be turned off. Press and hold it again for 3 seconds, it will be turned on.