Lenovo - L420

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Contents

ThinkPad Hardware Maintenance Manual ThinkPad L420 L421 and L520 Note Before using this information and the product it supports be sure to read the generai information under Appendix A Notices on page 165 Second Edition April 2011 Copyright Lenovo 2011 LIMITED AND RESTRICTED RIGHTS NOTICE If data or software is delivered pursuant a General Services Administration GSA contract use reproduction or disclosure is subject to restrictions set forth in Contract No GS 35F 05925 Contents About this manual iii Chapter 1 Safety information 1 General safety 1 Electrical safety 2 Safety Inspection guide 3 Handling devices that are sensitive to electrostatic discharge 3 Grounding requirements 4 Safety notices multilingual ...