Acer Aspire M3-581T Acer Aspire M3-581T and M3-581TG Notebook Service Guide - Page 28

Lock Keys 0 The keyboard has three lock keys which the user can toggle on and off. Table 1-9. Lock Keys Lock key Caps Lock Num Lock Scroll Lock + Description When on, all alphabetic characters are in uppercase. Off by default. When On, internal keyboard acts as numeric key padlock. If an external keyboard or keypad is present, the Num Lock will have the following definitions:  When On, the system boots with external keyboard/keypad Num Lock status On. Internal keyboard overlay numeric keys are disabled.  The key can be turned on/off via the internal keyboard (Fn+F11) or the external keyboard/keypad. Num Lock affects the external keyboard/keypad only.  Shift state is NOT used for the cursor movement by the numeric keys.  The state of the Num Lock is not changed by the attachment/removal (hot plug) of the external keyboard/keypad. When On, the screen moves one line up or down when pressing up or down arrow keys. Scroll Lock is not applicable for all applications. 1-18 Hardware Specifications and Configurations