Lenovo 20RK, Hardware Maintenance Manual

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Chapter 6. FRU replacement notices
This chapter presents notices related to removing and replacing parts. Read this chapter carefully before
replacing any 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 https://support.lenovo.com . Tap
Guides & Manuals and then 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.
Service tool kit
Ensure that the following service tool kit is prepared before you service a ThinkPad notebook computer.
No. Tool name Tool type
1 Phillips-head screwdriver Common tool
2 Torx-head screwdriver Common tool
3 Conductive tweezers Common tool
4 Hexagonal socket Common tool
5
Silicone grease Consumable tool
6 Polyamide tape Consumable tool
7 Mylar tape
Consumable tool
8 Eraser Consumable tool
9 Electrical tape Consumable tool
10 Double-sided tape Consumable tool
11 Conductive tape Consumable tool
Note: The silicone grease can be applied to the surfaces of the microprocessor and heatsink to eliminate air
gaps. The hexagonal socket is used to pick up the antenna connectors.
Screw notices
Loose screws can cause a reliability problem. In the ThinkPad computer, this problem is addressed with
special nylon-coated screws that have the following characteristics:
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