Справочник Пользователя для Lenovo A2109

This section presents notices related to removing and replacing parts. Read 

this section carefully before replacing any FRU.

Loose screws can cause a reliability problem. In the Lenovo IdeaPad 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.

• 

Each one should be used only once.

• 

Do the following when you service this machine: 

Keep the screw kit in your tool bag.

• 

Always use new screws.

• 

Use a torque screwdriver if you have one.

• 

Tighten screws as follows:

• 
  Turn an additional 90° after the screw head touches the surface of the 

plastic part:

• 
  Turn an additional 180° after the screw head touches the surface of the 

logic card: 

• 
  If you have a torque screwdriver , refer to the “Torque” column for each step.

Make sure that you use the correct screws. If you have a torque screwdriver, 

• 

tighten all screws firmly to the torque shown in the table. 

tightened firmly.
Ensure  torque  screwdrivers  are  calibrated  correctly  following  country 

• 

specifications.