Sonics FM - Manual (Page 34)

K E Y P A D S E C U R I T Y
The keypad can be “locked” so that all operating parameters that are selected
and set with the keypad are locked in, preventing unauthorized cancellation
or adjustment.
To activate the security feature, first press the INFO key 4 times to display the
current Mode Codes (i.e., T1 ZT NB IS 1 48 M, or other variation). Then,
press the numerical keys 0 and 7 in sequence within one second to lock the
keypad. When the keypad is secured in this manner, all parameter values
can still be displayed, but the CE key is not functional (the red LED will not
light up and parameters cannot be cancelled or changed). Any attempt to
change or enter parameters with the CE key will result in the following
message being displayed on the LCD screen:
To return to normal operation and unlock the keypad, repeat the lock
procedure - press the numerical keys 0 and 7 (within one second) while the
Mode Codes are displayed. The red LED in the upper corner of the CE key
will be illuminated again to prompt and permit cancellation.
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K E Y B OA R D I S L O C K E D