Proceed PDSD - Manual (Page 30)

30
more difficult to accidently disturb the carefully calibrated settings in the Setup
and Custom Menus. Toggle the lock on and off by moving the “select-it” cursor to
this item, changing to the “change-it” cursor by pressing
enter , and pressing either
volume + or volume – (with only two settings, either plus or minus will work).
Then save your change by pressing enter .