Lenovo 21BX001LGE, Hardware Maintenance Manual, Page: 55 / 96

Chapter 7. FRU replacement notices
Read this chapter carefully before replacing any FRU.
Service tool kit
Ensure that the following service tool kit is prepared before you service a notebook computer.
No. Tool name Tool type
1 Phillips-head screwdriver Common tool
2 Conductive tweezers Common tool
3 Silicone grease Consumable tool
4 Polyamide tape Consumable tool
5 Mylar tape Consumable tool
6 Eraser
Consumable tool
7 Electrical tape
Consumable tool
8 Double-sided tape Consumable tool
9 Conductive tape Consumable tool
Note: The silicone grease can be applied to the surfaces of the microprocessor and heatsink to eliminate air
gaps.
Screw notices
Loose screws can cause a reliability problem. In your computer, this problem is addressed with 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 the computer:
• Keep the screw kit in your tool bag. For the part number of the screw kit, go to:
https://support.lenovo.com/partslookup
Tighten screws as follows:
• Plastic to plastic
Turn an additional angle of 90 degrees after the screw head touches the surface of the plastic part.
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