Lenovo ThinkPad W520 Hardware Maintenance Manual - Page 5
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About this manual This manual contains service and reference information for the following ThinkPad® products. ThinkPad T520 and T520i Machine type (MT) 4239, 4240, 4241, 4242, 4243, 4244, and 4246 ThinkPad W520 MT 4249, 4260, 4270, 4276, 4281, 4282, and 4284 Use this manual along with the advanced diagnostic tests to troubleshoot problems. Important: This manual is intended only for trained service technicians who are familiar with ThinkPad products. Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively. Before servicing a ThinkPad product, be sure to read all the information under Chapter 1 "Safety information" on page 1 and Chapter 2 "Important service information" on page 25. © Copyright Lenovo 2011, 2012 iii