Цитата:
Сообщение от stalyngrad
и английский в PDF
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Все там нормально написано на странице 4 (пункты 6 и 7):
6. Power Lock Out - Press SET, UP, and DOWN at the same
time and hold 3 sec onds to lock the power switch on. To
turn the unit off, place the power switch in the OFF po si -
tion and push SET, UP, or DOWN. To re move the lock,
press SET, UP, and DOWN again at the same time and
hold 3 sec onds. A one-time only ON-LOCK mode can also
be en tered by quickly cy cling the power switch three
times.
7. Set Key Lock-Out, by press ing and hold ing the UP and
DOWN ar row keys to gether for 3 sec onds, the SET key is
dis abled. To re ac ti vate the SET key sim ply press and hold
the UP and DOWN keys again for 3 sec onds.
Думаю, что должно быть понятно - удерживать нажатой кнопку не менее 3 секунд.