Your K400 keyboard's Scroll Lock function key is located on the F12 key on the top row.
To toggle Scroll Lock off or on, press the FN + F12 key at the same time.
NOTE: If you have installed the Logitech SetPoint mouse and keyboard software, the confirmation message "Scroll Lock Off" or "Scroll Lock On" will be displayed for about 2 seconds in the lower portion of your monitor each time you toggle the key.
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