Lenovo ThinkPad W541 (English) Hardware Maintenance Manual - ThinkPad T540p, W - Page 64

Common service tools Below is the list of common service tools that you might need while servicing the computer. • Torx #T8 • Flat-head screwdriver size #2.5mm • Phillips screwdriver head size #0 • Phillips screwdriver head size #1 • Hex nut driver size #5mm • Menda Nylon Probe #35622 Before servicing the computer Carefully read this topic before servicing the computer. Removing the SIM card Some models you are servicing might have a SIM card that a customer has installed. If the computer you are servicing has a SIM card installed, remove it before you start the servicing. 1 2 After you finish the servicing, ensure that you install the card back into the slot firmly. 1010 Battery pack Important notices for replacing a battery pack Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use. The Lenovo Solution Center program provides an automatic battery diagnostic test that determines if the battery pack is defective. A battery pack FRU should not be replaced unless this diagnostic test shows 58 Hardware Maintenance Manual