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 Safety information and Important service information.

© Copyright Lenovo 2011

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IBM T520I, W520 About this manual