Lenovo E40-70 Laptop Hardware Maintenance Manual - Lenovo E40-xx Notebook - Page 59

Chapter 10. Removing or replacing a FRU This chapter provides instructions on how to remove or replace a FRU. CRU statement for customers: You can resolve some problems with your product with a replacement part you can install yourself, called a "Customer Replaceable Unit" or "CRU." Some CRUs are designated as self-service CRUs and others are designated as optional-service CRUs. Installation of self-service CRUs is your responsibility. For optional-service CRUs, you can either install the CRU yourself or you can request that a Service Provider install the CRU according to the warranty service for your product. If you intend on installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual can be found at http://www.lenovo.com/UserManuals. Follow the on-screen instructions to find the manual for your product. You might be required to return the defective part that is replaced by the CRU. When return is required: (1) return instructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) you might be charged for the replacement CRU if Lenovo does not receive the defective CRU within thirty (30) days of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full details. General guidelines When removing or replacing a FRU, be sure to observe the following general guidelines: 1. Do not try to service any computer unless you have been trained and certified. An untrained person runs the risk of damaging parts. 2. Before replacing any FRU, review Chapter 9 "FRU replacement notices" on page 51. 3. Begin by removing any FRUs that have to be removed before replacing the failing FRU. Any such FRUs are listed at the beginning of each FRU replacement section. Remove them in the order in which they are listed. 4. Follow the correct sequence in the steps for removing a FRU, as given in the illustrations by the numbers in square callouts. 5. When turning a screw, turn it in the direction as given by the arrow in the illustration. 6. When removing a FRU, move it in the direction as given by the arrow in the illustration. 7. To put the new FRU in place, reverse the removal procedure and follow any notes that pertain to replacement. 8. When replacing a FRU, use the correct screws as shown in the replacement procedures. DANGER Before removing any FRU, turn off the computer, unplug all power cords from electrical outlets, and then disconnect any interconnecting cables. Attention: After replacing a FRU, do not turn on the computer until you have made sure that all screws, springs, and other small parts are in place and none are loose inside the computer. Verify this by shaking the computer gently and listening for rattling sounds. Metallic parts or metal flakes can cause electrical short circuits. Attention: The system board is sensitive to, and can be damaged by, electrostatic discharge (ESD). Before touching it, establish personal grounding by touching a ground point with one hand or by using an electrostatic discharge strap. © Copyright Lenovo 2014 53