Before Servicing Thinkpad X300 - Lenovo ThinkPad X300 Hardware Maintenance Manual

Before servicing ThinkPad X300

Removing the SIM card:
Some models of the ThinkPad X300 you are servicing might have the SIM card
that the customer has been 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 first. (See "1010
Battery pack" on page 61.)
After you finish the servicing, make sure that you insert the card back into the slot
firmly.
Notice on disconnecting the cable from flip-lock ZIF connector:
Some cables used in the ThinkPad X300 are connected to the flip-lock ZIF
connectors.
When disconnecting the cable from those connectors, do as shown in this figure.
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ThinkPad X300 Hardware Maintenance Manual