Removing and installing Customer 
Replaceable Units (CRUs)
The replaceable components in this chapter are Customer Replaceable Units (CRUs).
CAUTION: Customers can replace only the Customer Replaceable Units (CRUs) following the safety precautions 
and replacement procedures.
NOTE: The images in this document may differ from your computer depending on the configuration you ordered.
SIM card tray
Removing the SIM card tray (optional)
Prerequisites
1. Follow the procedure in Before working inside your computer.
NOTE: The procedure for SIM card tray removal is only applicable for computers that are shipped with a WWAN module.
CAUTION: Removing the SIM card when the computer is turned on can cause data loss or damage to the card. 
Ensure that your computer is turned off or the network connections are disabled.
About this task
The following images indicate the location of the SIM card tray and provide a visual representation of the removal procedure.
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46 Removing and installing Customer Replaceable Units (CRUs)