Hardware Maintenance Manual: http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/x240s_hm_en_0c11160.pdf User Manual: http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/x240s_ug_en.pdf Source: http://forum.notebookreview.com/lenovo/724575-thinkpad-x240s.html