Mo91 ThinkPad T420s

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Table of contents

1 Rear View
2 Front view
3 Device Indicators
4 Bottom View

ThinkPad T420s, T420si

Rear View

source

Index	Item	Description
1	Power jack	The ac power adapter cable connects to the computer power jack to provide power to the computer and charge the battery.
2	Ethernet connector	Connect your computer to a LAN with the Ethernet connector. Two indicators, to the upper right and left of the connector, show the status of the network connection. When your computer connects to a LAN and a session with the network is available, the upper right indicator is solid green. While data is being transmitted, the upper left indicator blinks yellow. Note: If you attach your computer to the ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series 3, or ThinkPad Mini Dock Plus Series 3 (170 W); and use an Ethernet connector, use the Ethernet connector on the ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series 3, or ThinkPad Mini Dock Plus Series 3 (170 W), not the one on the computer.
3	USB connector (rear)	The Universal Serial Bus connectors are used for connecting devices compatible with a USB interface, such as a printer or a digital camera. Notes: Your computer is compatible with USB 1.1, 2.0, and 3.0. If your computer is a USB 3.0 model, any function specific to USB 3.0 will not work until your Windows operating system has been started. However, USB 2.0 or 1.0 devices will work.
4	Always on USB connector	The Universal Serial Bus connectors are used for connecting devices compatible with a USB interface, such as a printer or a digital camera. By default, even if your computer is in sleep (standby) mode, the Always On USB connector still enables you to charge some devices, such as iPod®, 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 configure 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 on-line help of the Power Manager program. Note: Your computer is compatible with USB 1.1 or USB 2.0.
5	DisplayPort connector	Your computer supports the DisplayPort, a next-generation digital display interface that connects a compatible projector, external monitor, or HDTV to your computer.
6	Monitor connector	You can attach an external monitor or a projector to your computer to display computer information. Note: If you attach your computer to the ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series 3, or ThinkPad Mini Dock Plus Series 3 (170 W); and use a monitor connector, use the monitor connector on the ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series 3, or ThinkPad Mini Dock Plus Series 3 (170 W), not the one on the computer.
7	Fan louvers (rear)	The internal fan and louvers enable air to circulate in the computer and cool the central processor. Note: To avoid impeding airflow, do not place any obstacle in front of the fan.

Front view

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Index	Item	Description
1	Computer display	The high-resolution, thin-film transistor (TFT) display provides clear and brilliant text and graphics.
2	Power switch	Use the power switch to turn on the computer. To turn off your computer, use the Start menu shutdown options. If you cannot turn off the computer by this method, press and hold the power switch for 2 seconds. If your computer stops responding, and you cannot turn it off, press and hold the power switch for 4 seconds or more. If the system is still not reset, remove the ac power adapter and the battery.
3	ThinkVantage® button	Press the ThinkVantage button to launch the SimpleTap program (for Windows® 7) or the ThinkVantage Productivity Center program (for Windows XP and Windows Vista®). Note: Depending on the date when your computer was manufactured, your computer might have the Lenovo ThinkVantage Toolbox program preinstalled instead of the SimpleTap program or the ThinkVantage Productivity Center program. You also can use the ThinkVantage button to interrupt the startup sequence of your computer and start the Rescue and Recovery® workspace.
4	TrackPoint buttons	The keyboard contains the unique TrackPoint® pointing device. Pointing, selecting, and dragging are all part of a single process that you can perform without moving your fingers from typing position. Move your fingertip across the UltraNav® touch pad to move the pointer. The TrackPoint and touch pad buttons provide functions similar to those of a mouse and its buttons.
5	TrackPoint pointing stick
18	Touch pad
19	Touch pad buttons
6	Volume control buttons	The built-in volume buttons enable you to quickly adjust the volume or mute the sound from your computer.
7	System and power-status indicators	Your computer has the system status indicators and the power status indicators.
8	UltraConnect wireless antennas (left)	The built-in antennas for the wireless communication are located at the top left and the top right portions of your computer display.
13	UltraConnect wireless antennas (right)
9	Built-in microphone (left)	The built-in microphone captures sound and voice when it is used with an application program capable of handling audio.
12	Built-in microphone (right)
10	Integrated camera	Some models have the integrated camera. By using this camera, you can take pictures or hold a video conference.
11	ThinkLight	You can use your computer under less than perfect lighting conditions. To illuminate the keyboard, turn on the ThinkLight® by pressing Fn+PgUp. To turn it off, press Fn+ PgUp again.
14	Built-in stereo speaker (right)	The stereo speakers are built into your computer.
21	Built-in stereo speaker (left)	The stereo speakers are built into your computer.
15	Forward and Back keys	The Forward and Back keys on your keyboard near the cursor-control keys are used with your Internet browser, such as Internet Explorer®. They function like the forward and back arrows in the browser that move you back and forward to pages you have viewed in the order that you opened them.
16	Fingerprint reader	Some models have the fingerprint reader.The fingerprint authentication technology enables you to use your fingerprint to start the computer and enter the UEFI Setup Utility.
17	Bluetooth antenna	Your computer has Bluetooth Integrated Bluetooth features.
20	Fn key	Use the Fn key to take advantage of ThinkPad® functions, such as turning on the ThinkLight. To use ThinkPad functions, press Fn + the required function key marked in blue.
22	CapsLock key indicator	The indicator of CapsLock is located on the CapsLock key.

Right side view

dex	Item	Description
1	Security keyhole	Your computer comes with a security keyhole. You can purchase a security cable and lock to fit this keyhole.
2	Serial Ultrabay Slim	Your computer has a bay for Serial Ultrabay Slim devices. An optical drive is installed in the bay. Note: You can install only a 9.5-mm-thick Serial Ultrabay Slim device in the Serial Ultrabay Slim. You cannot install a Serial Ultrabay Enhanced device.
3	Wireless radio switch	You can quickly turn the wireless features of your computer on and off using this switch.

dex

Item

Description

Security keyhole

Your computer comes with a security keyhole. You can purchase a security cable and lock to fit this keyhole.

Serial Ultrabay Slim

Your computer has a bay for Serial Ultrabay Slim devices. An optical drive is installed in the bay.

Note: You can install only a 9.5-mm-thick Serial Ultrabay Slim device in the Serial Ultrabay Slim. You cannot install a Serial Ultrabay Enhanced device.

Wireless radio switch

You can quickly turn the wireless features of your computer on and off using this switch.

Device Indicators

Index	Item	Description
1	Device Access	A hard disk drive or an optional drive, such as a drive in the Ultrabay, is being used to read or write data. When this indicator is blinking, do not put the computer into sleep (standby) mode, remove the device from the bay, or turn off the computer.
2	Power On	The power switch stays lit whenever the computer is on, blinks when the computer is in sleep (standby) mode, and is off when the computer is off.
3	CapsLock	Caps Lock mode is enabled. You can enter all alphabetic characters (A-Z) in upper case without pressing the Shift key.
4	Numeric lock	By default, when the numeric lock is on, the numeric lock indicator is displayed on the screen. Note: Another mode available for your computer, though there is no indicator for it, is Scroll Lock mode. When this mode is enabled, the arrow keys can be used as function keys for screen-scrolling, but not for moving the cursor. To enable or disable this mode, press ScrLk. Not all application programs support this function.

Bottom View

ex	Item	Description
1	PCI Express Mini Card slot for wireless LAN/WiMAX	Your computer might include a PCI Express Mini Card in the PCI Express Mini Card slot which enables wireless LAN/WiMAX communications.
2	PCI Express Mini Card slot for wireless WAN card or mSATA solid state drive	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.
3	Docking connector	With a ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series 3, and ThinkPad Mini Dock Plus Series 3 (170 W), you can extend the computer capabilities when you are in your office or at home.
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	Hard disk drive or solid state drive	Your computer may have a large-capacity, customer-upgradable hard disk drive that can meet a variety of storage demands. To keep the drive safe, Active Protection System™ is installed on your computer. If you wish, you can purchase another hard disk drive and install it in the serial Ultrabay slim. With Lenovo® technologies advancing to provide you with the best engineered systems, some models are equipped with a solid state drive for data storage. This cutting-edge technology enables notebook computers to be lighter, smaller and faster. Note: The hidden service partition is the reason why there is less free space than expected on your hard disk drive or solid state drive drive. This reduction is more noticeable on the solid state drive drive because of its smaller capacity.
6	SIM card slot	If your computer has a wireless WAN feature, it may require a SIM (Subscriber Identification Module) card to establish a wireless WAN (Wide Area Network) connections. Depending on the country of delivery, the SIM card may be already installed in the SIM card slot.
7	Battery	Use your computer with battery power whenever ac power adapter is unavailable. By installing a second battery, available as an option, in the Serial Ultrabay Slim, you can extend the operating time of the computer. You can also use Power Manager to adjust your power setting as needed.

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