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Before servicing ThinkPad T520, T520i, and W520
Removal steps of SIM card
Some models of the ThinkPad T520, T520i, and W520 you are servicing might have the SIM card that the
customer has installed.
If the computer you are servicing has the SIM card, remove it before you start the servicing.
To remove the SIM card, you need to remove the battery pack rst. (See “1010 Battery pack” on page 66.)
After you nish the servicing, make sure that you insert the card back into the slot rmly.
1010 Battery pack
Important notice for replacing a battery pack:
The Lenovo ThinkVantage Toolbox and Lenovo Solution Center (in Windows 7) have an automatic battery
diagnostic that determines if the battery pack is defective. A battery pack FRU should not be replaced unless
this diagnostic shows that the battery is defective.
The only exception to this is if the battery pack is physically damaged or a customer is reporting a possible
safety issue.
If ThinkVantage Toolbox or Lenovo Solution Center is not installed in the computer, the customer should
download this program before a non-physically damaged battery pack is replaced. Note that the replacement
of a physically damaged battery pack is not covered by the warranty.
Removal steps of battery pack
DANGER
Use only the battery specied in the parts list for your computer. Any other battery could ignite
or explode.
Unlock the battery latch 1 . Holding the battery latch in the unlocked position 2 , remove the battery pack in
the direction shown by arrow 3 .
66 Hardware Maintenance Manual