Lenovo 019923U Hardware Maintenance Manual

Contents

Chapter 7. FRU replacement noticesExternal CRU statement to customers:Some problems with your product can be resolved with a replacement part you can install yourself, calleda “Customer Replaceable Unit” or “CRU.” Some CRUs are designated as Self-service CRUs and othersare designated as Optional-service CRUs. Installation of Self-service CRUs is your responsibility; you mayrequest that Lenovo installs an Optional-service CRU according to the warranty service for your product.Where you are installing the CRU, Lenovo will ship the CRU to you. CRU information and replacementinstructions are shipped with your product and are available from Lenovo at any time upon request. You mayfind a list of CRUs in the publications that ship with your product or at http://www.lenovo.com/CRUs. Youmay be required to return the defective part that is replaced by the CRU. When return is required: (1) returninstructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) youmay be charged for the replacement CRU if Lenovo does not receive the defective part within thirty (30) daysof your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full details.This chapter presents notices related to removing and replacing parts. Read this chapter carefully beforereplacing any FRU.Screw noticesLoose screws can cause a reliability problem. In the ThinkPad notebook computer, this problem is addressedwith special nylon-coated screws that have the following characteristics:• They maintain tight connections.• They do not easily come loose, even with shock or vibration.• They are harder to tighten.Do the following when you service this machine:• Keep the screw kit in your tool bag. For the part number of the screw kit, see “Miscellaneous parts” onpage 140.• It is recommended to use new screws.• It is recommended to use each screw only once.• Use a torque screwdriver if you have one.Tighten screws as follows:• Plastic to plasticTurn an additional 90 degrees after the screw head touches the surface of the plastic part:• Logic card to plasticTurn an additional 180 degrees after the screw head touches the surface of the logic card:© Copyright Lenovo 2010, 2013 53