Sony PCV-RS311 手册

arrow and correction keys on the numeric keypad area are active. 
Caps Lock 

The Caps Lock indicator lights up to advise you that the keyboard is set to type letters in uppercase. When

the indicator is off, the letters appear in lower case as you type. 
Scroll Lock 

The Scroll Lock indicator lights up to advise you that your screen's scrolling pattern has changed. When the

indicator is off, the screen scrolls normally. This function is not available with all software applications.