Lenovo Yoga C640-13IML, Yoga C640-13IML LTE User Manual
Lenovo Yoga C640-13IML
User Guide
Read this first
Before using this documentation and the product it supports, ensure that you read and understand the
following:
• Appendix A “Important safety information” on page 33
• Safety and Warranty Guide
• Setup Guide
First Edition (July 2019)
© Copyright Lenovo 2019.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services
Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS35F-05925.
Contents
About this documentation . . . . . . . . iii
Chapter 1. Meet your computer. . . . . 1
Front . . . . . . . . . . . . . . . . . . . . 1
Base . . . . . . . . . . . . . . . . . . . . 2
Left . . . . . . . . . . . . . . . . . . . . 3
Right . . . . . . . . . . . . . . . . . . . . 4
Bottom . . . . . . . . . . . . . . . . . . . 5
Features and specifications . . . . . . . . . . . 6
Statement on USB transfer rate . . . . . . . . 6
Operating environment . . . . . . . . . . . 7
Chapter 2. Get started with your
computer . . . . . . . . . . . . . . . . . 9
Get started with Windows 10 . . . . . . . . . . 9
Windows account . . . . . . . . . . . . . 9
Windows user interface . . . . . . . . . . 11
Windows Updates . . . . . . . . . . . . 12
Lenovo Vantage and Lenovo PC Manager . . . . 12
Connect to Wi-Fi networks . . . . . . . . . . 12
Connect to a cellular network. . . . . . . . 12
Forget a Wi-Fi network . . . . . . . . . . 14
Turn on or off airplane mode . . . . . . . . 14
Interact with your computer . . . . . . . . . . 14
Yoga modes . . . . . . . . . . . . . . 14
Multi-touch gestures . . . . . . . . . . . 15
Lenovo Digital Pen . . . . . . . . . . . 18
Keyboard hotkeys . . . . . . . . . . . . 19
What is UEFI/BIOS setup utility . . . . . . . 23
Open the UEFI/BIOS setup utility . . . . . . 23
Change startup sequence . . . . . . . . . 23
Change hotkey mode. . . . . . . . . . . 23
Enable or disable always-on . . . . . . . . 23
Set passwords in UEFI/BIOS setup utility . . . . . 24
Password types . . . . . . . . . . . . . 24
Set administrator password . . . . . . . . 24
Change or remove administrator password . . 24
Set user password . . . . . . . . . . . . 25
Enable power-on password . . . . . . . . 25
Set hard disk password . . . . . . . . . . 25
Change or remove hard disk password . . . . 26
Reset or restore Windows . . . . . . . . . . . 26
Windows 10 recovery options . . . . . . . 26
Windows System Restore . . . . . . . . . 26
Reset Windows . . . . . . . . . . . . . 27
Create a recovery drive . . . . . . . . . . 27
Use a recovery drive to restore or reset
Windows . . . . . . . . . . . . . . . 28
Chapter 4. Help and support . . . . . 29
Frequently asked questions . . . . . . . . . . 29
Self-help resources . . . . . . . . . . . . . 29
Call Lenovo . . . . . . . . . . . . . . . . 31
Before you contact Lenovo . . . . . . . . 31
Lenovo Customer Support Center . . . . . . 31
Purchase additional services. . . . . . . . . . 32
Chapter 3. Explore your computer . . 21
Connect to an external display device . . . . . . 21
Connect a wired display device . . . . . . . 21
Connect a wireless display device . . . . . . 21
Manage power . . . . . . . . . . . . . . . 21
Check the battery status . . . . . . . . . 22
Charge the battery . . . . . . . . . . . . 22
Check the battery temperature . . . . . . . 22
Set power button behavior. . . . . . . . . 22
Change or create a power plan . . . . . . . 22
Set performance mode . . . . . . . . . . 22
Change settings in UEFI/BIOS setup utility . . . . 23
© Copyright Lenovo 2019 i
Appendix A. Important safety
information . . . . . . . . . . . . . . . 33
Appendix B. Accessibility and
ergonomic information . . . . . . . . 45
Appendix C. Compliance
information . . . . . . . . . . . . . . . 49
Appendix D. Notices and
trademarks . . . . . . . . . . . . . . . 63
ii Lenovo Yoga C640-13IML User Guide
About this documentation
• Illustrations in this documentation might look different from your product.
• Depending on the model, some optional accessories, features, and software programs might not be
available on your computer.
• Depending on the version of operating systems, some user interface instructions might not be applicable
to your computer.
• Documentation content is subject to change without notice. Lenovo makes constant improvements on the
documentation of your computer, including this User Guide. To get the latest documentation, go to
support.lenovo.com
• Microsoft
®
makes periodic feature changes to the Windows® operating system through Windows Update.
.
As a result, some information in this documentation might become outdated. Refer to Microsoft resources
for the latest information.
• This documentation applies to the following product models:
Model Name Machine Type
Lenovo Yoga C640-13IML 81UE
https://
Lenovo
Yoga C640-13IML LTE
81XL
© Copyright Lenovo 2019 iii
iv Lenovo Yoga C640-13IML User Guide
Chapter 1. Meet your computer
Front
1. Microphones
Camera
2.
3. Camera cover slider Move the slider to cover or uncover the camera lens.
4. Multi-touch screen Display text, graphics, and videos and supports multi-touch function.
Capture or record sound and voice.
Take pictures or record videos by clicking Camera from the Start
menu.
Note: If you use other apps that support photographing, video
chatting, and video conference, the camera starts automatically when
you enable the camera-required feature from the app.
Note: The camera cover helps you better protect your privacy.
See “Multi-touch gestures” on page 15.
© Copyright Lenovo 2019 1
Base
1. Keyboard Enter characters and interact with programs.
Note: The keyboard also includes hotkeys and function keys for
changing settings and performing tasks quickly.
2. Speakers
3. Fingerprint reader Enroll and read your fingerprint for user authentication.
4. LTE antennas* Establish wireless-WAN connection.
5. Wireless antennas Send and receive radio waves for the built-in wireless LAN (local area
6. Touchpad Perform finger touch and all the functions of a traditional mouse.
Produce sound.
Note: The antennas are not visible from the outside of the computer.
network) and Bluetooth module.
Note: The antennas are not visible from the outside of the computer.
Note: The touchpad also supports multi-touch function.
* for selected models
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Lenovo Yoga C640-13IML User Guide
Left
1. Power connector Connect to power with the included power cord and ac power
adapter.
2. Charging light
3. USB (3.1 Gen 1) Type-A connector Connect a USB-compatible device, such as a USB keyboard, a USB
4. Combo audio jack Connect headphones or headsets with a 3.5-mm (0.14-inch), 4-pole
Indicate whether the computer is connected to ac power.
• Solid white: connected to ac power; battery capacity 91% – 100%
• Solid amber: connected to ac power; battery capacity 1% – 90%
• Off: not connected to ac power
mouse, a USB storage device, or a USB printer.
plug.
Note: This jack does not support standalone external microphones. If
you use headsets, choose one with a single plug.
Chapter 1. Meet your computer 3
Right
1. SIM card slot* Insert a SIM card to connect to a cellular data network.
2. USB-C
TM
connector (USB 3.1 Gen 1)
• Charge USB-C compatible devices with the output voltage and
current of 5 V and 3 A.
• Transfer data at USB 3.1 speed, up to 5 Gbps.
• Connect to an external display.
• Connect to USB-C accessories to help expand your computer
functionality. To purchase USB-C accessories, go to
www.lenovo.com/accessories
Note: When the battery power is below 10%, the connected USB-C
accessories might not work correctly.
.
https://
3. USB (3.1 Gen 1) Type-A connector Connect a USB-compatible device, such as a USB keyboard, a USB
mouse, a USB storage device, or a USB printer.
4. Power button (with power button light) Press to turn on the computer or put the computer to sleep mode.
To turn off the computer, open the Start menu, click
then select Shut down.
The indicator on the power button shows the system status of your
computer.
• Solid white/amber: the computer is on.
• Off: the computer is off or in hibernation mode.
• Blinking slowly: the computer is in sleep mode.
Power, and
* for selected models
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Lenovo Yoga C640-13IML User Guide
Bottom
1. Ventilation slots Dissipate heat.
2. Novo button hole Press the Novo button to open the Novo Button menu. From the
menu, you can choose to open the UEFI/BIOS setup utility, the Boot
menu, or the Windows startup options screen.
Chapter 1. Meet your computer 5
Features and specifications
Dimensions
ac power adapter
Battery pack
Microprocessor To view the microprocessor information of your computer, right-click
Memory
Storage device
Screen
• Width: 306 mm (12.04 inches)
• Depth: 204.48 mm (8.05 inches)
• Thickness:
– Thinnest: 16.18 mm (0.63 inches)
– Thickest: 16.91 mm (0.66 inches)
• Input: 100 V to 240 V ac, 50 Hz to 60 Hz
• Output: 20 V dc, 2.25 A
• Power: 45 W
• 60 Wh
• 4 cells
the Start button and then select System.
On-board double data rate 4 (DDR4) synchronous dynamic randomaccess memory (SDRAM)
• Type: M.2 solid-state drive
• Bus: PCI Express
• Multi-touch screen
• Display size: 337.8 mm (13.3 inches)
• Display resolution: 1920 x 1080 pixels
Keyboard
Connectors and slots
Wireless features
• Hotkeys
• Keyboard backlight
• ac power connector
• Combo audio jack
• USB-C connector (USB 3.1 Gen 1)
• Two USB (3.1 Gen 1) Type-A connectors
• SIM card slot*
• Bluetooth
• Wireless LAN
* for selected models
Note: The battery capacity is the typical or average capacity as measured in a specific test environment.
Capacities measured in other environments may differ but are no lower than the rated capacity (see product
label).
Statement on USB transfer rate
Depending on many factors such as the processing capability of the host and peripheral devices, file
attributes, and other factors related to system configuration and operating environments, the actual transfer
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Lenovo Yoga C640-13IML User Guide
rate using the various USB connectors on this device will vary and will be slower than the data rate listed
below for each corresponding device.
USB device Data rate (Gbit/s)
3.1 Gen 1
Gen 2
3.1
3.2 20
5
10
Operating environment
Maximum altitude (without pressurization)
3048 m (10 000 ft)
Temperature
• At altitudes up to 2438 m (8000 ft)
– Operating: 5°C to 35°C (41°F to 95°F)
– Storage: 5°C to 43°C (41°F to 109°F)
• At altitudes above 2438 m (8000 ft)
– Maximum temperature: 31.3°C (88°F)
Note: When you charge the battery, its temperature must be no lower than 10°C (50°F).
Relative humidity
• Operating: 8% to 95% at wet-bulb temperature 23°C (73°F)
• Storage: 5% to 95% at wet-bulb temperature 27°C (81°F)
Chapter 1. Meet your computer 7
8 Lenovo Yoga C640-13IML User Guide
Chapter 2. Get started with your computer
Get started with Windows 10
Learn the basics of Windows 10 and start working with it right away. For more information about Windows
10, see the Windows help information.
Windows account
You must create at least one account to use the Windows operating system. It can be either a local account
or a Microsoft account.
Local accounts
A local account is created on a particular Windows-enabled device and it can only be used on that device. It
is recommended that you set a password for each local account to prevent unauthorized access to the
device.
Microsoft accounts
A Microsoft account is a user account that you use to sign in to Microsoft software and services. If you use
Microsoft services like OneDrive, Outlook.com, Xbox Live, Office 365, and Skype, you might already have
one. If you don't have it, you can create one for free.
There are two main benefits of using a Microsoft account:
• Sign in only once. If you use a Microsoft account to sign in to Windows 10, you don’t need to sign in again
to use OneDrive, Skype, Outlook.com, and other Microsoft services.
• Settings can be synced. If you use your Microsoft account to sign in to multiple Windows-enabled
devices, certain Windows settings can be synced among the devices.
Switch between a local and a Microsoft account
If you are using a local account to sign in to Windows 10, you can switch to use a Microsoft account instead.
Step 1. Open the Start menu and select Settings ➙ Accounts.
Step 2. Select Sign in with a Microsoft account instead.
Step 3. If you already have a Microsoft account, enter the account name and password to sign in.
Otherwise, select Create one to create a new Microsoft account.
Note: The device must have Internet access the first time you use a Microsoft account on that
device.
If you want to switch back to use a local account, open the Start menu and select Settings ➙ Accounts ➙
Sign in with a local account instead.
Add additional user accounts
Your user account must be of the “Administrator” type to add additional user accounts to Windows.
Add additional user accounts if you need to share your computer with family members or other people.
Step 1. Open the Start menu and select Settings ➙ Accounts ➙ Family & other users.
Step 2. Select either Add a family member or Add someone else to this PC.
© Copyright Lenovo 2019 9
Note: By default, you are prompted to add Microsoft accounts. If you don’t know the person’s
Microsoft account, select I don’t have this person’s sign-in information. Follow on-screen
instructions to create a Microsoft account for the person. Alternatively, select Add a user without a
Microsoft account to create a local account for the person.
Enroll your fingerprint
If your computer includes a fingerprint reader, you can enroll your fingerprint for Windows sign-in.
Step 1. Open the Start menu and select Settings ➙ Accounts ➙ Sign-in options.
Note: If you are using a local account, the account must be password protected. Otherwise, you
cannot enroll fingerprints.
Step 2. Under Fingerprint, select Set up ➙ Get started.
Step 3. Follow on-screen instructions to complete enrollment. Create a PIN when prompted, in case your
fingerprint cannot be recognized at Windows sign-in.
Note: You can enroll more than one fingerprint.
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Lenovo Yoga C640-13IML User Guide
Windows user interface
1. Account
2. Documents
3. Pictures
4. Settings
5. Power
6. Start button
7. Windows Search
8. Task View
9. Windows notification area
10. Battery status icon
11. Network icon
12. Action center
Change account settings, lock the computer, or sign out from the current account.
Open the Documents folder, a default folder to save your received files.
Open the Pictures folder, a default folder to save your received pictures.
Launch Settings.
Shut down, restart, or put the computer in sleep mode.
Open the Start menu.
Type what you are looking for in the search box and get search results from your
computer and the Web.
Display all opened apps and switch among them.
Display notifications and status of some features.
Display power status and change battery or power settings. When your computer
is not connected to ac power, the icon changes to
Connect to an available wireless network and display the network status.
Display the latest notifications from apps and provide quick access to some
features.
Open the Start menu
• Click the Start button.
• Press the Windows logo key on the keyboard.
.
Access Control Panel
• Open the Start menu and click Windows System ➙ Control Panel.
• Use Windows Search.
Chapter 2. Get started with your computer 11
Launch an app
• Open the Start menu and select the app you want to launch.
• Use Windows Search.
Windows Updates
Microsoft periodically releases feature and security updates to the Windows operating system. Updates that
are applicable to your version of Windows are downloaded automatically when your computer is connected
to the Internet. When updates are downloaded, you are prompted to restart the computer to install these
updates.
Manually check for updates
Updates to Windows are downloaded automatically. However, you can also manually check if there are
available updates for the installed version of Windows.
Attention: Only download and install updates using Windows Update. Updates downloaded from other
sources may include security risks.
Step 1. Select Start ➙ Settings ➙ Update & Security.
Step 2. Click Check for updates.
Lenovo Vantage and Lenovo PC Manager
Lenovo Vantage and Lenovo PC Manager is software developed by Lenovo. Using the software, you can:
• View product information
• View warranty and support information
• Run hardware scan and diagnose problems
• Change hardware settings
• Update Windows, drivers, and UEFI/BIOS
Lenovo Vantage or PC Manager may be pre-installed on your computer. To open it, enter the software name
in Windows Search and select the matched result.
Note: If Lenovo Vantage is not pre-installed, you can download it from Microsoft Store.
Connect to Wi-Fi networks
If your computer includes a wireless adapter, you can connect your computer to Wi-Fi networks.
Step 1. Click the network icon in the Windows notification area. A list of nearby networks is displayed.
Note: If no network is displayed, check whether the airplane mode is turned off.
Step 2. Select a network and click Connect. Provide security key if prompted.
Note: The network key is usually managed by the network administrator.
Connect to a cellular network
If your computer has a wireless wide area network (WAN) card and a nano-SIM card installed, you can
connect to a cellular data network and get online using the cellular signal.
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Lenovo Yoga C640-13IML User Guide
Note: The cellular service is provided by authorized mobile service carriers in some countries or regions.
You must have a cellular plan from a service carrier to connect to the cellular network.
To establish a cellular connection:
Shut down your computer before inserting a SIM card.
Step 1. Use the pin to eject the SIM card tray as shown.
Step 2. Insert the SIM card in the SIM card tray. Note the orientation of the card and ensure that it is seated
correctly.
Step 3. Insert the SIM card tray into the SIM card slot.
Step 4. Click the network icon in the Windows notifications area, and then select the cellular network icon
from the list.
Chapter 2. Get started with your computer 13
Step 5. Provide the required information if needed.
Forget a Wi-Fi network
Windows saves a list of Wi-Fi networks you have connected to, along with their passwords and other
settings. By doing this, your computer is automatically connected when it is in the range of a previously
connected network. However, if the network password has been changed, you need to forget the network in
order to enter the new password.
Step 1. Select Start ➙ Settings ➙ Network & Internet ➙ Wi-Fi.
Step 2. Click Manage known networks.
Step 3. Click the network name and click Forget.
Turn on or off airplane mode
Airplane mode is a convenient setting to turn on or off all wireless communication of your computer. You may
need to turn it on when boarding an airplane.
Step 1. Click the notification icon in the Windows notification area.
Step 2. Click the airplane mode icon to turn it on or off.
Note: Click Expand if you cannot find the airplane mode icon.
Interact with your computer
Yoga modes
The screen of your computer can open up to 360 degrees, enabling you to use your computer for different
purposes.
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Lenovo Yoga C640-13IML User Guide
Mode Suitable for
Notebook mode
• Entering text
• Drag and drop operations using the touchpad
Stand mode
• Giving a presentation
• Viewing a slide show
Tent mode
Tablet mode
Watching movies
Playing touch-enabled games
Multi-touch gestures
If your computer display supports multi-touch function, you can navigate the screen with simple touch
gestures.
Chapter 2. Get started with your computer 15
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