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4 Memory-upgrade slot
You can increase the amount of memory in your computer by installing a memory module in the memory
bay. Memory modules are available as options.
5 PCI Express Mini Card slot for wireless WAN card or mSATA solid state drive (some models)
Your computer might include a PCI Express Mini Card in the PCI Express Mini Card slot which enables
wireless WAN communications.
With Lenovo technologies advancing to provide you with the best engineered systems, some models are
equipped with a mSATA solid state drive for data storage.
6 SIM card slot (some models)
If your computer has a wireless WAN (Wide Area Network) feature, it may require a SIM (Subscriber
Identication Module) card to establish a wireless WAN connection. Depending on the country of delivery,
the SIM card may be already installed in the SIM card slot.
For details, refer to the instructions in “Replacing the SIM card” on page 104.
Rear view
Figure 5. ThinkPad L420 and L520 rear view
1 Always on USB connector 2 Security keyhole
3 Fan louvers (rear)
1 Always on USB connector
The Universal Serial Bus (USB) connector is used for connecting USB interface-compatible devices, such
as a printer or digital camera.
By default, even when your computer is in sleep (standby) mode, the Always On USB connector still enables
you to charge some devices, such as iPod
®
and iPhone and BlackBerry
®
smartphones, by attaching the
devices to the connector.
However, with the ac power adapter attached, if you want to charge these devices when your computer
is in hibernation mode or powered off, you will need to open the Power Manager program and congure
corresponding settings to enable the Always On USB connector function. For details about how to enable
the Always On USB connector function, refer to the online help of the Power Manager program.
Note: Your computer is compatible with USB 1.1 or USB 2.0.
8 User Guide