About this manual
This manual contains service and reference information for the following ThinkPad® products.
ThinkPad T520 and T520i
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 23.
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