Table of Contents
- About this documentation
- Chapter 1. Meet your computer
- Chapter 2. Get started with your computer
- Chapter 3. Explore your computer
- Chapter 4. Help and support
- Appendix A. Important safety information
- Appendix B. Accessibility and ergonomic information
- Appendix C. Compliance information
- Appendix D. Notices and trademarks
Lenovo 940-15IRH User Manual
Displayed below is the user manual for 940-15IRH by Lenovo which is a product in the Notebooks category. This manual has pages.
Related Manuals
Lenovo Yoga C940-15IRH
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 35
• 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. GS-
35F-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 . . . . . . . . 7
Operating environment . . . . . . . . . . . 7
Chapter 2. Get started with your
computer . . . . . . . . . . . . . . . . . 9
Get started with Windows 10 . . . . . . . . . . 9
Windows account . . . . . . . . . . . . . 9
Windows user interface . . . . . . . . . . 11
Lenovo Vantage and Lenovo PC Manager . . . . 12
Connect to Wi-Fi networks . . . . . . . . . . 12
Forget a Wi-Fi network . . . . . . . . . . 12
Turn airplane mode on and off . . . . . . . 12
The Novo Button menu . . . . . . . . . . . . 13
Open the Novo Button menu . . . . . . . . 13
Yoga modes . . . . . . . . . . . . . . . . 13
Turn on screen rotation lock . . . . . . . . 15
Use Windows touch keyboard . . . . . . . 15
Turn tablet mode on and off . . . . . . . . 16
Interact with your computer . . . . . . . . . . 16
Numeric keypad . . . . . . . . . . . . . 16
Keyboard hotkeys . . . . . . . . . . . . 16
Multi-touch gestures . . . . . . . . . . . 17
The Lenovo Integrated Pen . . . . . . . . 19
Chapter 3. Explore your computer . . 23
Connect to an external display device . . . . . . 23
Connect a wired display device . . . . . . . 23
Connect a wireless display device . . . . . . 23
Manage power . . . . . . . . . . . . . . . 23
Check the battery status . . . . . . . . . 24
Charge the battery . . . . . . . . . . . . 24
Check the battery temperature . . . . . . . 24
Set power button behavior. . . . . . . . . 24
Change or create a power plan . . . . . . . 24
Set performance mode . . . . . . . . . . 24
Change settings in UEFI/BIOS setup utility . . . . 25
What is UEFI/BIOS setup utility . . . . . . . 25
Open the UEFI/BIOS setup utility . . . . . . 25
Change startup sequence . . . . . . . . . 25
Change hotkey mode. . . . . . . . . . . 25
Enable or disable always-on . . . . . . . . 25
Set passwords in UEFI/BIOS setup utility . . . . . 26
Password types . . . . . . . . . . . . . 26
Set administrator password . . . . . . . . 26
Change or remove administrator password . . 26
Set user password . . . . . . . . . . . . 27
Enable power-on password . . . . . . . . 27
Set hard disk password . . . . . . . . . . 27
Change or remove hard disk password . . . . 28
Reset or restore Windows . . . . . . . . . . . 28
Windows 10 recovery options . . . . . . . 28
Windows System Restore . . . . . . . . . 28
Reset Windows . . . . . . . . . . . . . 29
Create a recovery drive . . . . . . . . . . 29
Use a recovery drive to restore or reset
Windows . . . . . . . . . . . . . . . 30
Chapter 4. Help and support . . . . . 31
Frequently asked questions . . . . . . . . . . 31
Self-help resources . . . . . . . . . . . . . 31
Call Lenovo . . . . . . . . . . . . . . . . 33
Before you contact Lenovo . . . . . . . . 33
Lenovo Customer Support Center . . . . . . 33
Purchase additional services. . . . . . . . . . 34
Appendix A. Important safety
information . . . . . . . . . . . . . . . 35
Appendix B. Accessibility and
ergonomic information . . . . . . . . 47
Appendix C. Compliance
information . . . . . . . . . . . . . . . 51
Appendix D. Notices and
trademarks . . . . . . . . . . . . . . . 65
© Copyright Lenovo 2019 i
ii Lenovo Yoga C940-15IRH 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 https://
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.
© Copyright Lenovo 2019 iii
iv Lenovo Yoga C940-15IRH User Guide
Chapter 1. Meet your computer
Front
1. Microphones Capture or record sound and voice.
2. Camera Take pictures or record videos by clicking Camera from the Start menu.
Note: If you use other apps that support photo capture, video chat, and video
conference, the camera starts automatically when you enable the camera-
required feature from the app.
3. Camera cover slider Move the slider to cover or uncover the camera lens.
Note: The camera cover helps you better protect your privacy.
4. Camera light If the light is on, the camera is in use.
5. Multi-touch screen Display text, graphics, and videos.
Note: The screen also supports multi-touch function. You can use your fingers or
the included pen to interact with the computer.
6. Speakers Produce sound.
© Copyright Lenovo 2019 1
Base
1. Wireless antennas Send and receive radio waves for the built-in wireless LAN (local area network)
and Bluetooth module.
Note: The antennas are not visible from the outside of the computer.
2. Keyboard Enter characters and interact with programs.
Note: In addition to character keys, the keyboard also includes hotkeys, function
keys, and a numeric keypad.
3. Fingerprint reader Enroll and read your fingerprint for user authentication.
4. Touchpad Perform finger touch and all the functions of a traditional mouse.
Note: The touchpad also supports multi-touch function.
2Lenovo Yoga C940-15IRH User Guide
Left
1. Power connector Connect to power with the included power cord and the ac power adapter.
2. Charging light Indicate the power and battery status of the computer.
3. ThunderboltTM 3 connectors Connect external display, storage, or data devices.
Note: An appropriate adapter may be needed for connecting external devices.
• Support data transfer rates up to 40 Gbps for Thunderbolt 3.
• Support DisplayPort 1.4.
• Provide up to 5 V, 3 A power output.
4. Combo audio jack Connect headphones or headsets with a 3.5-mm (0.14-inch), 4-pole plug.
Note: This jack does not support standalone external microphones. If you use
headsets, choose one with a single plug.
Table 1. Indication of the charging light
Light status ac power Battery satus Battery capacity
Solid white Connected Charged 91% – 100%
Solid amber Connected Charging 1% – 90%
Off Not connected / /
Chapter 1.Meet your computer 3
Right
1. Pen slot Use the pen to write and draw on the computer screen.
2. USB (3.1 Gen 1) Type-A
connector (always-on)
The always-on connector can charge external devices when the computer is
turned off, in sleep or hibernation modes.
Note: The always-on function can be turned on or off in one or more of the
following software:
Lenovo Vantage
Lenovo PC Manager
UEFI/BIOS Setup utility
3. Power light Indicate the power and battery status of the computer.
4. Power button Turn on the computer or put the computer into sleep mode.
Note: See “Set power button behavior” on page 24 for how to change the power
button behavior in Windows.
Table 2. Indication of the power light
Power light status Computer Battery capacity
Solid white Turned on 21% – 100%
Fast blinking white Turned on 1% – 20%
Slow blinking white In sleep mode /
Off Turned off or in hibernation mode /
4Lenovo Yoga C940-15IRH User Guide
Features and specifications
Dimensions • Width: 355.2 mm (13.98 inches)
• Depth: 238.39 mm (9.38 inches)
• Thickness
– Thinnest: 17.5 mm (0.69 inches)
– Thickest: 19.7 mm (0.78 inches)
ac power adapter • Input: 100 V – 240 V ac, 50 Hz to 60 Hz
• Output: 20 V dc, 6.75 A
• Power: 135 W
Battery pack • 69 Wh
• 4 cells
Microprocessor To view the microprocessor information of your computer, right-click the Start
button and then select System.
Memory Onboard DDR4
Storage device • Type: solid-state drive
• Form factor: M.2 (2280)
• Bus: PCI Express
Screen • Size: 396.2 mm (15.6 inches)
• Display resolution
– 1920 x 1080 pixels full high definition (FHD)
– 3840 x 2160 pixels ultra high definition (UHD)
Keyboard • Hotkeys
• Function keys
• Numeric keypad
• Keyboard backlight
Connectors and slots • ac power connector
• Combo audio jack
• USB (3.1 Gen 1) Type-A connector (always-on)
• Two Thunderbolt 3 connectors
• Lenovo Integrated Pen slot
Wireless features • Bluetooth
• Wireless LAN
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).
6Lenovo Yoga C940-15IRH User Guide
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
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 5
3.1 Gen 2 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
8Lenovo Yoga C940-15IRH 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 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. Select Windows Hello Fingerprint ➙ 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.
10 Lenovo Yoga C940-15IRH User Guide
Windows user interface
1. Account Change account settings, lock the computer, or sign out from the current account.
2. Documents Open the Documents folder, a default folder to save your received files.
3. Pictures Open the Pictures folder, a default folder to save your received pictures.
4. Settings Launch Settings.
5. Power Shut down, restart, or put the computer into sleep.
6. Start button Open the Start menu.
7. Windows Search Type what you are looking for in the search box and get search results from your
computer and the Web.
8. Task View Display all opened apps and switch among them.
9. Windows notification area Display notifications and status of some features.
10. Battery status icon Display power status and change battery or power settings. When your computer
is not connected to ac power, the icon changes to .
11. Network icon Connect to an available wireless network and display the network status.
12. Action center 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.
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 to ensure that the airplane mode is not turned on.
Step 2. Select a network and click Connect. Provide security key if prompted.
Note: The network key is usually managed by the network administrator.
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 airplane mode on and off
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.
12 Lenovo Yoga C940-15IRH User Guide
The Novo Button menu
The Novo Button menu can be displayed before the operating system starts. From the menu, you can
choose to
• Open the BIOS/UEFI setup utility
• Open the boot device selection menu
• Open the Windows startup options screen
Note: From the Windows startup options screen, you can then choose to
Start your computer using a recovery drive
Reset your computer
Open advanced options screen
Open the Novo Button menu
For Lenovo computers with a Novo button, you can press the button to open the Novo Button menu.
Step 1. Turn off the computer.
Step 2. Open the LCD screen and press the Novo button.
Note: Alternatively, turn off the computer. Press Fn and the power button to open the Novo Button menu.
Yoga modes
The screen of your computer can open up to 360 degrees, enabling you to use your computer for different
purposes.
Chapter 2.Get started with your computer 13
Mode Suitable for
Notebook mode • Entering text
• Drag and drop operations using the touchpad
Stand mode • Gving a presentation
• Viewing a slide show
14 Lenovo Yoga C940-15IRH User Guide
Mode Suitable for
Tent mode Watching movies
Tablet mode Playing touch-enabled games
Turn on screen rotation lock
In stand, tent, or tablet mode, auto rotation is turned on so that the orientation of the screen changes based
on how you place or hold the computer. However, you can turn on rotation lock to keep the screen in a fixed
orientation.
Step 1. Select the action center icon in the Windows notification area.
Step 2. Select the Rotation lock icon to turn it on.
Note: Rotation lock is disabled in notebook mode.
Use Windows touch keyboard
In stand, tent, or tablet mode, the physical keyboard of your computer is disabled to prevent inadvertent
typing. In these three modes, Windows touch keyboard is automatically displayed when text input is
required. If it is not, select the touch keyboard icon ( ) in the Windows notification area.
Note: If you are not seeing the touch keyboard icon, tap and hold the taskbar and select Show touch
keyboard button.
Chapter 2.Get started with your computer 15
Turn tablet mode on and off
Windows 10 provides the table mode that makes touch operations more friendly. When rotating your
computer screen to switch to tablet, stand, or tent mode, you will be prompted to switch to Windows tablet
mode. You can also manually turn Windows tablet mode on and off.
Step 1. Select the action center icon in the Windows notification area.
Step 2. Select the Tablet mode icon to turn it on or off.
Interact with your computer
Numeric keypad
The keyboard includes a dedicated numeric keypad on the far right. It is used for entering numbers and
operators quickly.
Press the NumLock key to enable or disable the numeric keypad.
Keyboard hotkeys
Some keys on the keyboard are printed with icons. These keys are called hotkeys and can be pressed alone
or in combination with the Fn key to access certain Windows functions or settings quickly. The functions of
hotkeys are symbolized by the icons printed on them.
Hotkey Function
Mute/Unmute sound.
Decrease/Increase system volume.
Mute/Unmute the microphones.
Reload Web pages or refresh the screen.
Enable/Disable the touchpad.
Turn on/off airplane mode.
Enable/Disable the integrated camera.
Lock the screen.
Switch display devices.
Increase/Decrease screen brightness.
Play/Pause the audio/video.
Stop the audio/video.
Play the previous audio/video track.
16 Lenovo Yoga C940-15IRH User Guide
Hotkey Function
Play the next audio/video track.
Turn on/off or adjust the brightness of the keyboard backlight.
Note: This hotkey must be used with the Fn key.
Hotkey mode
Some hotkeys share keys with functions keys (F1 to F12). The hotkey mode is a UEFI/BIOS setting that
changes how hotkeys (or function keys) are used.
Hotkey mode setting How to use hotkeys How to use function keys
Disabled Hold down the Fn key and press one of
the hotkeys.
Press the function keys directly.
Enabled Press the hotkeys directly. Hold down the Fn key and press one of
the function keys.
Note: Hotkeys that do not share keys with function keys are not affected by the hotkey mode setting. They
should always be used with the Fn key.
Multi-touch gestures
If your computer display supports multi-touch function, you can navigate the screen with simple touch
gestures.
Note: Not all gestures are available on all apps.
Tap once
• From the Start menu: Open an app or item.
• From the desktop: Select an app or item.
• In an open app: Perform an action such as Copy, Save, and Delete, depending
on the app.
Tap twice quickly
Open an app or item from the desktop.
Chapter 2.Get started with your computer 17
Tap and hold
Open a shortcut menu.
Slide
Scroll through items, such as lists, pages, and photos.
Drag an item to the location you want
Move an object.
Move two fingers closer together
Zoom out.
Move two fingers farther apart
Zoom in.
18 Lenovo Yoga C940-15IRH User Guide
Swipe in from the right edge
Open the action center to see your notifications and quick actions.
Swipe in from the left edge
View all your open windows in task view.
• Swipe downwards shortly from the top edge (for full-screened app or
when your computer is in the tablet mode)
Show a hidden title bar.
• Swipe in from the top edge to the bottom edge (when your computer is in
the tablet mode)
Close the current app.
The Lenovo Integrated Pen
Your computer includes an integrated digital pen for writing and drawing on the computer screen. The pen is
inserted in a slot on the right side of the computer.
Note: You do not need to pair the pen with the computer.
Figure 1. Lenovo Integrated Pen – overview
1. Pen tip 2. Bottom button
3. Top button 4. Charging pins
Charge the integrated pen
In the slot, the pen is automatically charged when the computer is turned on or in sleep mode.
Notes:
Chapter 2.Get started with your computer 19
• The pen is not charged at factory. Charge the pen before first use.
• Ensure the pen is completely inserted into the slot and the computer is not turned off or in hibernation
mode.
Table 3. Charging time for the Lenovo Integrated Pen
Charged to Time needed
80% 15 seconds
100% 5 minutes
Pen settings
You can change pen related settings in Windows Settings and Lenovo Pen Settings.
Software Available settings and actions
Windows Settings (Pen & Windows Ink) • Show or hide pen cursor
• Set the font size and family for handwriting
• Improve handwriting recognition
Note:
This function is not supported by all languages.
Lenovo Pen Settings • View the battery status of the pen
• Change functions for the top and bottom buttons
• Enable or disable near-screen click for the top and
bottom buttons
• Set pen tip sensitivity
Open Pen & Windows Ink in Windows Settings
Step 1. In Windows 10, select Start ➙ Settings.
Step 2. Select Devices ➙ Pen & Windows Ink.
Open Lenovo Pen Settings
Step 1. In Windows 10 search box, enter Lenovo Pen Settings.
Step 2. Select the matched result.
Enable near-screen click for pen buttons
You can enable near-screen click for the pen’s top and bottom buttons so that they can work like the left and
right buttons of a mouse.
Pen buttons with near-screen enabled Function similar to which button on a mouse?
Top button Right button
Bottom button Left button
Step 1. Open Lenovo Pen Settings.
Step 2. Set the function for Top Barrel Button to Barrel Button and set Hover Click to On.
Step 3. Set the function for Bottom Barrel Button to Erase and set Hover Click to On.
20 Lenovo Yoga C940-15IRH User Guide
After near-screen click is enabled, you may use the pen buttons like you would the left and right buttons on a
mouse.
Note: To use near-screen click function, the pen tip should be placed near the computer screen, within 1
cm. You may set Windows Settings to show pen cursor so that you know whether the pen is placed near
enough.
Check the pen's battery status
Step 1. Tap the pen tip on the computer screen.
Note: Always tap the pen tip on the screen before viewing the pen’s battery status. Otherwise, the
reading as shown in Lenovo Pen Settings is not accurate.
Step 2. Open Lenovo Pen Settings. A battery icon is displayed in the upper right corner.
Step 3. Move the mouse pointer on top of the battery icon to view the charge reading.
If the pen’s battery charge is low, insert the pen back into the slot for charging.
The virtual control dial
With the integrated pen, you can display a virtual control dial on the computer screen. The dial is comprised
of eight sectors. Each sector can be assigned a function, so you can use the dial to perform tasks quickly.
Figure 2. The virtual control dial with functions defined for all eight sectors
Define dial functions
You can define the dial's functions in Lenovo Pen Settings.
Step 1. Open Lenovo Pen Settings.
Step 2. Select Radial Menu.
Step 3. Select a sector on the dial.
Step 4. Enter a label text for the sector and select a target function from the drop-down list.
Step 5. Repeat steps 3 and 4 to define functions for other sectors.
Display the virtual dial
You can set one of the pen’s two buttons to display the virtual dial.
Chapter 2.Get started with your computer 21
Step 1. Open Lenovo Pen Settings.
Step 2. Set the function of either the top or the bottom button to Radial Menu.
Step 3. Close Lenovo Pen Settings.
Step 4. Place the pen tip near the computer screen and click either the top or the bottom button.
Note: To close the virtual dial, select the X icon in the center of the dial.
22 Lenovo Yoga C940-15IRH User Guide
Chapter 3. Explore your computer
Connect to an external display device
You may connect your computer to an external display device through wired or wireless connection.
Connection type Condition
Wired Prepare an appropriate USB-C adapter
Wireless • The external display supports Miracast, or
• Purchase and use a Miracast adapter
Connect a wired display device
Use the Thunderbolt 3 connector and an appropriate adapter (not supplied) to connect your computer to a
wired display device. Depending on the types of connector that the display device supports, you may need
to purchase and use one of the following adapters.
• USB-C to DisplayPort
• USB-C to HDMI
• USB-C to DVI
• USB-C to VGA
Read the documentation for the display device before purchasing an adapter.
Step 1. Plug the USB-C connector of the adapter into one of the two Thunderbolt 3 connectors on your
computer.
Step 2. Plug the cable of the display device into the appropriate connector on the adapter.
Note: Some modern display devices support video input through a USB-C connector. You can use a USB-C
to USB-C cable to connect such display devices directly.
Connect a wireless display device
You can connect your computer to an external display that supports Miracast.
Note: The display device may support Miracast directly or through an adapter that supports Miracast.
Step 1. In Windows 10, select Start ➙ Settings ➙ Devices.
Step 2. Select Add Bluetooth or other device ➙ Wireless display or dock.
Step 3. Select the device name to connect to.
Notes: If the device name is not displayed, check to ensure that
• Wi-Fi is turned on for your computer, and
• The display device is turned on and is near your computer.
Manage power
Use the information in this section to achieve the best balance between performance and power efficiency.
© Copyright Lenovo 2019 23
Check the battery status
The battery status icon or is in the Windows notification area. You can check the battery status, view
the current power plan, and access battery settings quickly.
Click the battery status icon to display the percentage of battery power remaining and change the power
mode. A warning message is displayed when the battery is low.
Charge the battery
When the battery power is low, charge your battery by connecting your computer to ac power.
The battery is fully charged in about two to four hours. The actual charging time depends on the battery
capacity, the physical environment, and whether you are using the computer.
Battery charging is also affected by its temperature. The recommended temperature range for charging the
battery is between 10°C (50°F) and 35°C (95°F).
Note: To maximize the life of the battery, the computer does not start recharging the battery if the remaining
power is greater than 95%.
Check the battery temperature
You can check the battery temperature in Lenovo Vantage or Lenovo PC manager.
Step 1. Open Lenovo Vantage.
Step 2. Click Hardware Settings ➙ Power.
Step 3. Locate the Power Status section and then click Show Details to view the battery temperature.
Note: If you’re using Lenovo PC Manager, select System hardware ➙ Battery.
Set power button behavior
By default, pressing the power button puts the computer to sleep mode. However, you can change the
power button behavior in Windows Control Panel.
Step 1. Right-click the battery status icon in the Windows notification area.
Step 2. Select Power Options ➙ Choose what the power buttons do.
Change or create a power plan
A power plan is a set of power saving settings. You can choose a pre-defined power plan or you can create
your own plans.
Step 1. Right-click the battery status icon in the Windows notification area.
Step 2. Select Power Options ➙ Change plan settings.
Set performance mode
Your computer can work in different performance modes. The performance and power consumption of the
computer vary in different performance modes. Press Fn+Q to cycle through different performance modes.
24 Lenovo Yoga C940-15IRH User Guide
Change settings in UEFI/BIOS setup utility
This section introduces what is UEFI/BIOS and the operations you can perform in its setup utility.
What is UEFI/BIOS setup utility
UEFI/BIOS is the first program that runs when a computer starts. UEFI/BIOS initializes hardware components
and loads the operating system and other programs. Your computer may include a setup program (setup
utility) with which you can change certain UEFI/BIOS settings.
Open the UEFI/BIOS setup utility
Step 1. Turn on or restart the computer.
Step 2. When the Lenovo logo appears on the screen, press F2 repeatedly.
Note: For computers with hotkey mode enabled, press Fn + F2.
Change startup sequence
You may need to change startup sequence to allow the computer to start from another device or a network
location.
Step 1. Open the UEFI/BIOS setup utility.
Step 2. Navigate to the Boot menu.
Step 3. Follow on-screen instructions to change the order of devices under Boot Priority Order.
Note: You can also change startup sequence temporarily without opening the setup utility. To do so, start
the computer. When the Lenovo logo appears, press F12 (or Fn + F12) repeatedly.
Change hotkey mode
Step 1. Open the UEFI/BIOS setup utility.
Step 2. Select Configuration ➙ Hotkey Mode and press Enter.
Step 3. Change the setting to Disabled or Enabled.
Step 4. Select Exit ➙ Exit Saving Changes.
Enable or disable always-on
For some Lenovo computers with always-on connectors, the always-on function can be enabled or disabled
in the UEFI/BIOS setup utility.
Step 1. Open the UEFI/BIOS setup utility.
Step 2. Select Configuration ➙ Always On USB and press Enter.
Step 3. Change the setting to Disabled or Enabled.
Step 4. Select Exit ➙ Exit Saving Changes.
Note: If Lenovo Vantage or Lenovo PC Manager (software) is pre-installed on your computer, you may also
enable or disable always-on in the software.
Chapter 3.Explore your computer 25
Set passwords in UEFI/BIOS setup utility
This section introduces the types of passwords that you can set in the UEFI (Unified Extensible Firmware
Interface) or BIOS (Basic Input/Output System) setup utility.
Password types
You can set various types of passwords in the UEFI/BIOS setup utility.
Password type Pre-requisite Usage
Administrator password No You must enter it to start the setup
utility.
User password The administrator password must be
set.
You can use the user password to
start the setup utility.
Master hard disk password No You must enter it to start the
operating system.
User hard disk password The master hard disk password must
be set.
You can use the user hard disk
password to start the operating
system.
Notes:
• All passwords set in the setup utility consist of alphanumeric characters only.
• If you start the setup utility using the user password, you can only change a few settings.
Set administrator password
You set the administrator password to prevent unauthorized access to the UEFI/BIOS setup utility.
Attention: If you forget the administrator password, a Lenovo authorized service personnel cannot reset
your password. You must take your computer to a Lenovo authorized service personnel to have the system
board replaced. Proof of purchase is required and a fee will be charged for parts and service.
Step 1. Open the UEFI/BIOS setup utility.
Step 2. Select Security ➙ Set Administrator Password and press Enter.
Step 3. Enter a password string that contains only letters and numbers and then press Enter
Step 4. Enter the password again and press Enter.
Step 5. Select Exit ➙ Exit Saving Changes.
Next time you start the computer, you must enter the administrator password to open the setup utility. If
Power on Password is enabled, you must enter the administrator password or the user password to start
the computer.
Change or remove administrator password
Only the administrator can change or remove the administrator password.
Step 1. Open the UEFI/BIOS setup utility using the administrator password.
Step 2. Select Security ➙ Set Administrator Password and press Enter.
Step 3. Enter the current password.
26 Lenovo Yoga C940-15IRH User Guide
Step 4. In the Enter New Password text box, enter the new password.
Step 5. In the Confirm New Password text box, enter the new password again.
Note: If you want to remove the password, press Enter in both text boxes without entering any
character.
Step 6. Select Exit ➙ Exit Saving Changes.
If you remove the administrator password, the user password is also removed.
Set user password
You must set the administrator password before you can set the user password.
The administrator of the setup utility might need to set a user password for use by others.
Step 1. Open the UEFI/BIOS setup utility using the administrator password.
Step 2. Select Security ➙ Set User Password and press Enter.
Step 3. Enter a password string that contains only letters and numbers and then press Enter. The user
password must be different from the administrator password.
Step 4. Enter the password again and press Enter.
Step 5. Select Exit ➙ Exit Saving Changes.
Enable power-on password
If the administrator password has been set, you can enable power-on password to enforce greater security.
Step 1. Open the UEFI/BIOS setup utility.
Step 2. Select Security ➙ Power on Password and press Enter.
Note: The administrator password must be set in advance.
Step 3. Change the setting to Enabled.
Step 4. Select Exit ➙ Exit Saving Changes.
If power-on password is enabled, a prompt appears on the screen every time you turn on the computer. You
must enter the administrator or user password to start the computer.
Set hard disk password
You can set a hard disk password in the setup utility to prevent unauthorized access to your data.
Attention: Be extremely careful when setting a hard disk password. If you forget the hard disk password, a
Lenovo authorized service personnel cannot reset your password or recover data from the hard disk. You
must take your computer to a Lenovo authorized service personnel to have the hard disk drive replaced.
Proof of purchase is required and a fee will be charged for parts and service.
Step 1. Open the UEFI/BIOS setup utility.
Step 2. Select Security ➙ Set Hard Disk Password and press Enter.
Note: If you start the setup utility using the user password, you cannot set hard disk password.
Step 3. Follow on-screen instructions to set both master and user passwords.
Note: The master and user hard disk passwords must be set at the same time.
Chapter 3.Explore your computer 27
Step 4. Select Exit ➙ Exit Saving Changes.
If the hard disk password is set, you must provide the correct password to start the operating system.
Change or remove hard disk password
Step 1. Open the UEFI/BIOS setup utility.
Step 2. Select Security.
Step 3. Change or remove the hard disk password.
To change or remove master password, select Change Master Password and press Enter.
Note: If you remove the master hard disk password, the user hard disk password is also removed.
To change user password, select Change User Password and press Enter.
Note: The user hard disk password cannot be removed separately.
Step 4. Select Exit ➙ Exit Saving Changes.
Reset or restore Windows
This section introduces the recovery options of Windows 10. Ensure that you read and follow the on-screen
recovery instructions.
Attention: The data on your computer might be deleted during the recovery process. To avoid data loss,
make a backup copy of all the data that you want to keep.
Windows 10 recovery options
Windows 10 provides several options for you to restore or reset your computer. The following table helps you
decide which option to choose if you are having problems with Windows.
Problem Option
Your computer is not working well after installing apps, drivers, or
updates.
Restore to a system restore point.
Your computer is not working well and you don't know what causes
the problem.
Reset your computer.
You want to recycle or donate your computer. Reset your computer.
Windows cannot start properly. Use a recovery drive to restore or reset your
computer.
Windows System Restore
System Restore is a tool included in Windows 10. It monitors changes to Windows system files and saves
system state as a restore point. If your computer does not work well after installing apps, drivers, or updates,
you can revert your system to a previous restore point.
Note: If you revert your system to a previous restore point, personal data is not affected.
System Restore creates restore points:
• automatically (when it detects changes to Windows system files)
28 Lenovo Yoga C940-15IRH User Guide
• at regular intervals (if set up by the user)
• at any time (if initiated manually by the user)
Note: In order for System Restore to create restore points, system protection must be turned on for the
system drive.
Create a system restore point manually
You can use Windows System Restore to create a restore point at any time.
Step 1. In Windows 10 search box, enter Create a restore point and select the matched result.
Step 2. Select the System Protection tab and then select Create.
Note: System protection must be turned on for the system drive (typically with drive letter C)
before you can create restore points. Select a drive and then select Configure to turn on or disable
system protection.
Restore from a system restore point
Step 1. In Windows 10 search box, enter Recovery and select the matched result.
Step 2. Select Open System Restore ➙ Next.
Step 3. Select a restore point and then select Next ➙ Finish.
Note: You may select Scan for affected programs to check which program and driver installation
is associated with a particular restore point.
Reset Windows
If Windows is not running well as usual, you can choose to reset it.
Step 1. Open the Start menu and then select Settings ➙ Update & Security ➙ Recovery.
Step 2. Under Reset this PC, click Get started.
Step 3. Choose either Keep my files or Remove everything.
Attention: Back up personal data before choosing Remove everything.
Step 4. Follow on-screen instructions to complete the reset process.
Create a recovery drive
Use a USB drive (not supplied) to create a Windows recovery drive. In cases Windows cannot start, it can be
used to troubleshoot problems or reset Windows.
Notes: Most USB drives utilize the Type-A connector. If your computer does not include a USB Type-A
connector, you have two options:
• Purchase and use a USB drive with the Type-C connector, or
• Purchase and use a USB Type-C to Type-A adapter
Step 1. In Windows 10 search box, enter Create a recovery drive and select the matched result.
Step 2. Make sure Back up system files to the recovery drive is selected and then select Next.
Step 3. Connect a USB drive to your computer, select it, and then select Next ➙ Create.
Attention: Previous files on the drive will be deleted. Back up personal files before using it to
create a recovery drive.
Chapter 3.Explore your computer 29
When recovery drive is created, you might see a Delete the recovery partition from your PC option. If you
want to free up drive space on your computer, select it and then select Delete. Otherwise, select Finish.
Use a recovery drive to restore or reset Windows
If Windows cannot start, you can use a recovery drive (created in advance) to restore or reset Windows.
Step 1. Connect the recovery drive to your computer; restart your computer and set it to start from the
recovery drive.
Note: For computers without a USB Type-A connector, you may need to purchase and use an
adapter (USB Type-C to Type-A) to use a recovery drive.
Step 2. On the Choose an option screen, select Troubleshoot.
Step 3. Choose a recovery option.
Select Advanced Options ➙ System Restore to restore your computer to a system restore point.
Or select Recover from a drive to reset your computer.
Note: If you did not select the Back up system files to the recovery drive option when creating
the recovery drive, Recovery from a drive is not available.
Attention: All personal files created on your computer will be deleted after recovering from the
drive.
30 Lenovo Yoga C940-15IRH User Guide
Chapter 4. Help and support
Frequently asked questions
How do I open the Control Panel? • Open the Start menu and select Windows System ➙ Control Panel.
• Use Windows Search.
How should I turn off my
computer? Open the Start menu and select Power ➙ Shut down.
How do I partition my storage
drive? Refer to https://support.lenovo.com/solutions/ht503851
What should I do if my computer
stops responding.
Press and hold the power button until the computer turns off. Then restart the
computer.
What should I do if I spill liquid on
the computer?
1. Carefully unplug the ac power adapter and turn off the computer immediately.
The more quickly you stop the current from passing through the computer the
more likely you will reduce damage from short circuits.
Attention: Although you might lose some data or work by turning off the
computer immediately, leaving the computer on might make your computer
unusable.
2. Wait until you are certain that all the liquid is dry before turning on your
computer.
CAUTION:
Do not try to drain out the liquid by turning over the computer. If your
computer has keyboard drainage holes on the bottom, the liquid will be
drained out through the holes.
Where can I get the latest device
drivers and UEFI/BIOS?
• Lenovo Vantage or Lenovo PC Manager
• Lenovo Support Web site at https://support.lenovo.com
Self-help resources
Use the following self-help resources to learn more about the computer and troubleshoot problems.
Resources How to access?
Use Lenovo Vantage or Lenovo PC Manager to:
• Download and install the latest drivers and firmware.
• Configure hardware settings.
• Diagnose computer hardware problems.
• Check the computer warranty status.
• Open the Start menu and select Lenovo Vantage or
PC Manager.
• Use Windows Search.
Product documentation:
• Safety and Warranty Guide
• Setup Guide
• This User Guide
• Regulatory Notice
1. Go to https://support.lenovo.com.
2. Detect your computer or select computer model
manually.
3. Select Documentation and filter out the
documentation you want.
© Copyright Lenovo 2019 31
Resources How to access?
Lenovo Support Web site with the latest support
information of the following:
• Drivers and software
• Diagnostic solutions
• Product and service warranty
• Product and parts details
• Knowledge base and frequently asked questions
Visit https://support.lenovo.com
Windows help information
• Open the Start menu and select Get Help or Tips.
• Use Windows Search or the Cortana® personal
assistant.
• Microsoft support Web site: https://
support.microsoft.com
32 Lenovo Yoga C940-15IRH User Guide
Call Lenovo
If you have tried to correct the problem yourself and still need help, you can call Lenovo Customer Support
Center.
Before you contact Lenovo
Record product information and problem details before you contact Lenovo.
Product information Problem symptoms and details
• Product name
• Machine type and serial number
• What is the problem? Is it continuous or intermittent?
• Any error message or error code?
• What operating system are you using? Which version?
• Which software applications were running at the time
of the problem?
• Can the problem be reproduced? If so, how?
Note: The product name and serial number can usually be found on the bottom of the computer, either
printed on a label or etched on the cover.
Lenovo Customer Support Center
During the warranty period, you can call Lenovo Customer Support Center for help.
Telephone numbers
For a list of the Lenovo Support phone numbers for your country or region, go to https://
pcsupport.lenovo.com/supportphonelist.
Note: Phone numbers are subject to change without notice. If the number for your country or region is not
provided, contact your Lenovo reseller or Lenovo marketing representative.
Services available during the warranty period
• Problem determination - Trained personnel are available to assist you with determining if you have a
hardware problem and deciding what action is necessary to fix the problem.
• Lenovo hardware repair - If the problem is determined to be caused by Lenovo hardware under warranty,
trained service personnel are available to provide the applicable level of service.
• Engineering change management - Occasionally, there might be changes that are required after a product
has been sold. Lenovo or your reseller, if authorized by Lenovo, will make selected Engineering Changes
(ECs) that apply to your hardware available.
Services not covered
• Replacement or use of parts not manufactured for or by Lenovo or nonwarranted parts
• Identification of software problem sources
• Configuration of UEFI/BIOS as part of an installation or upgrade
• Changes, modifications, or upgrades to device drivers
• Installation and maintenance of network operating systems (NOS)
• Installation and maintenance of programs
For the terms and conditions of the Lenovo Limited Warranty that apply to your Lenovo hardware product,
see “Warranty information” in the Safety and Warranty Guide that comes with your computer.
Chapter 4.Help and support 33
Appendix A. Important safety information
Safety notices
This information can help you safely use your computer. Follow and retain all information included with your
computer. The information in this document does not alter the terms of your purchase agreement or the
Limited Warranty. For more information, see "Warranty Information" in the Safety and Warranty Guide that
comes with your computer.
Customer safety is important. Our products are developed to be safe and effective. However, personal
computers are electronic devices. Power cords, power adapters, and other features can create potential
safety risks that can result in physical injury or property damage, especially if misused. To reduce these risks,
follow the instructions included with your product, observe all warnings on the product and in the operating
instructions, and review the information included in this document carefully. By carefully following the
information contained in this document and provided with your product, you can help protect yourself from
hazards and create a safer computer work environment.
Note: This information includes references to power adapters and batteries. In addition, some products
(such as speakers and monitors) ship with external power adapters. If you have such a product, this
information applies to your product. In addition, computer products contain a coin-sized internal battery that
provides power to the system clock even when the computer is unplugged, so the battery safety information
applies to all computer products.
Important information about using your computer
Ensure that you follow the important tips given here to get the most use and enjoyment out of your computer.
Failure to do so might lead to discomfort or injury, or cause the computer to fail.
Protect yourself from the heat that your computer generates.
When your computer is turned on or the battery is charging, the base, the palm
rest, and some other parts may become hot. The temperature they reach depends
on the amount of system activity and the level of charge in the battery.
Extended contact with your body, even through clothing, could cause discomfort
or even a skin burn.
• Avoid keeping your hands, your lap, or any other part of your body in contact
with a hot section of the computer for any extended time.
• Periodically take hands from the keyboard by lifting your hands from the palm
rest.
© Copyright Lenovo 2019 35
Protect yourself from the heat generated by the ac power adapter.
When the ac power adapter is connected to an electrical outlet and your
computer, it generates heat.
Extended contact with your body, even through clothing, may cause a skin burn.
• Do not place the ac power adapter in contact with any part of your body while it
is in use.
• Never use it to warm your body.
• Do not wrap the cords around the ac power adapter while in use.
Prevent your computer from getting wet.
To avoid spills and the danger of electrical shock, keep liquids away from your
computer.
Protect the cables from being damaged.
Applying strong force to cables may damage or break them.
Route communication lines, or the cables of an ac power adapter, a mouse, a
keyboard, a printer, or any other electronic device, so that they cannot be walked
on, tripped over, pinched by your computer or other objects, or in any way subject
to treatment that could interfere with the operation of your computer.
Handle your computer gently.
Do not drop, bump, scratch, twist, hit, vibrate, push, or place heavy objects on
your computer, display, or external devices.
36 Lenovo Yoga C940-15IRH User Guide
Carry your computer carefully.
• Use a quality carrying case that provides adequate cushioning and protection.
• Do not pack your computer in a tightly packed suitcase or bag.
• Before putting your computer in a carrying case, make sure that it is off, in
sleep mode, or in hibernation mode. Do not put a computer in a carrying case
while it is turned on.
Conditions that require immediate action
Products can become damaged due to misuse or neglect. Some product damage is serious enough
that the product should not be used again until it has been inspected and, if necessary, repaired by an
authorized servicer.
As with any electronic device, pay close attention to the product when it is turned on.
On very rare occasions, you might notice an odor or see a puff of smoke or sparks vent from your
product. You might also hear sounds like popping, cracking, or hissing. These might merely mean that
an internal electronic component has failed in a safe and controlled manner. Or, they might indicate a
potential safety issue. Do not take risks or attempt to diagnose the situation yourself. Contact the
Customer Support Center for further guidance. For a list of Service and Support phone numbers, see
the following Web site:
https://pcsupport.lenovo.com/supportphonelist
Frequently inspect your computer and its components for damage, wear or signs of danger. If you
have any question about the condition of a component, do not use the product. Contact the Customer
Support Center or the product manufacturer for instructions on how to inspect the product and have it
repaired, if necessary.
In the unlikely event that you notice any of the following conditions, or if you have any safety concerns
with your product, stop using the product and unplug it from the power source and
telecommunication lines until you can speak to the Customer Support Center for further guidance.
• Power cords, plugs, power adapters, extension cords, surge protectors, or power supplies that are
cracked, broken, or damaged.
• Signs of overheating, smoke, sparks, or fire.
• Damage to a battery (such as cracks, dents, or creases), discharge from a battery, or a buildup of foreign
substances on the battery.
• A cracking, hissing, or popping sound, or strong odor that comes from the product.
• Signs that liquid has been spilled or an object has fallen onto the computer product, the power cord, or
power adapter.
• The computer product, power cord, or power adapter has been exposed to water.
• The product has been dropped or damaged in any way.
• The product does not operate normally when you follow the operating instructions.
Appendix A. Important safety information 37
Note: If you notice these conditions with a product (such as an extension cord) that is not manufactured for
or by Lenovo, stop using that product until you can contact the product manufacturer for further instructions,
or until you get a suitable replacement.
Service and upgrades
Do not attempt to service a product yourself unless instructed to do so by the Customer Support Center or
your documentation. Only use a Service Provider who is approved to repair your particular product.
Note: Some computer parts can be upgraded or replaced by the customer. Upgrades typically are referred
to as options. Replacement parts approved for customer installation are referred to as Customer
Replaceable Units, or CRUs. Lenovo provides documentation with instructions when it is appropriate for
customers to install options or replace CRUs. You must closely follow all instructions when installing or
replacing parts. The Off state of a power indicator does not necessarily mean that voltage levels inside a
product are zero. Before you remove the covers from a product equipped with a power cord, always ensure
that the power is turned off and that the product is unplugged from any power source. If you have any
questions or concerns, contact the Customer Support Center.
Although there are no moving parts in your computer after the power cord has been disconnected, the
following warnings are required for your safety.
Keep fingers and other parts of your body away from hazardous, moving parts. If you suffer an injury, seek
medical care immediately.
Avoid contact with hot components inside the computer. During operation, some components become hot
enough to burn the skin. Before you open the computer cover, turn off the computer, disconnect power, and
wait approximately 10 minutes for the components to cool.
After replacing a CRU, reinstall all protective covers, including the computer cover, before connecting power
and operating the computer. This action is important to help prevent unexpected electrical shock and help
ensure the containment of an unexpected fire that could happen under extremely rare conditions.
When replacing CRUs, be cautious of sharp edges or corners that might cause injury. If you suffer an injury,
seek medical care immediately.
38 Lenovo Yoga C940-15IRH User Guide
Power cords and power adapters
DANGER
Use only the power cords and power adapters supplied by the product manufacturer.
The power cords shall be safety approved. For Germany, it shall be H03VV-F, 3G, 0.75 mm2, or
better. For other countries, the suitable types shall be used accordingly.
Never wrap a power cord around a power adapter or other object. Doing so can stress the cord in
ways that can cause the cord to fray, crack, or crimp. This can present a safety hazard.
Always route power cords so that they will not be walked on, tripped over, or pinched by objects.
Protect power cords and power adapters from liquids. For instance, do not leave your power cord
or power adapter near sinks, tubs, toilets, or on floors that are cleaned with liquid cleansers. Liquids
can cause a short circuit, particularly if the power cord or power adapter has been stressed by
misuse. Liquids also can cause gradual corrosion of power cord terminals and/or the connector
terminals on a power adapter, which can eventually result in overheating.
Ensure that all power cord connectors are securely and completely plugged into receptacles.
Do not use any power adapter that shows corrosion at the ac input pins or shows signs of
overheating (such as deformed plastic) at the ac input pins or anywhere on the power adapter.
Do not use any power cords where the electrical contacts on either end show signs of corrosion or
overheating or where the power cord appears to have been damaged in any way.
To prevent possible overheating, do not cover the power adapter with clothing or other objects
when the power adapter is plugged into an electrical outlet.
Extension cords and related devices
Ensure that extension cords, surge protectors, uninterruptible power supplies, and power strips that you use
are rated to handle the electrical requirements of the product. Never overload these devices. If power strips
are used, the load should not exceed the power strip input rating. Consult an electrician for more information
if you have questions about power loads, power requirements, and input ratings.
Appendix A. Important safety information 39
Plugs and outlets
DANGER
If a receptacle (power outlet) that you intend to use with your computer equipment appears to be
damaged or corroded, do not use the outlet until it is replaced by a qualified electrician.
Do not bend or modify the plug. If the plug is damaged, contact the manufacturer to obtain a
replacement.
Do not share an electrical outlet with other home or commercial appliances that draw large
amounts of electricity; otherwise, unstable voltage might damage your computer, data, or attached
devices.
Some products are equipped with a three-pronged plug. This plug fits only into a grounded
electrical outlet. This is a safety feature. Do not defeat this safety feature by trying to insert it into a
non-grounded outlet. If you cannot insert the plug into the outlet, contact an electrician for an
approved outlet adapter or to replace the outlet with one that enables this safety feature. Never
overload an electrical outlet. The overall system load should not exceed 80 percent of the branch
circuit rating. Consult an electrician for more information if you have questions about power loads
and branch circuit ratings.
Be sure that the power outlet you are using is properly wired, easily accessible, and located close to
the equipment. Do not fully extend power cords in a way that will stress the cords.
Be sure that the power outlet provides the correct voltage and current for the product you are
installing.
Carefully connect and disconnect the equipment from the electrical outlet.
Power supply statement
Never remove the cover on a power supply or any part that has the following label attached.
Hazardous voltage, current, and energy levels are present inside any component that has this label attached.
There are no serviceable parts inside these components. If you suspect a problem with one of these parts,
contact a service technician.
External devices
CAUTION:
Do not connect or disconnect any external device cables other than Universal Serial Bus (USB) and
1394 cables while the computer power is on; otherwise, you might damage your computer. To avoid
possible damage to attached devices, wait at least five seconds after the computer is shut down to
disconnect external devices.
40 Lenovo Yoga C940-15IRH User Guide
General battery notice
DANGER
Batteries supplied by Lenovo for use with your product have been tested for compatibility and
should only be replaced with approved parts. A battery other than the one specified by Lenovo, or a
disassembled or modified battery is not covered by the warranty.
Battery abuse or mishandling can cause overheating, liquid leakage, or an explosion. To avoid
possible injury, follow these instructions:
• Do not open, disassemble, or service any battery.
• Do not crush or puncture the battery.
• Do not short-circuit the battery, or expose it to water or other liquids.
• Keep the battery away from children.
• Keep the battery away from fire.
Stop using the battery if it is damaged, or if you notice any discharge or the buildup of foreign
materials on the battery leads.
Store the rechargeable batteries or products containing the rechargeable batteries at room
temperature, charged to approximately 30 to 50% of capacity. We recommend that the batteries be
charged at least once per year to prevent overdischarge.
Do not put the battery in trash that is disposed of in landfills. When disposing of the battery, comply
with local ordinances or regulations.
Notice for built-in rechargeable battery
DANGER
Do not attempt to remove or replace the built-in rechargeable battery. Replacement of the battery
must be done by a Lenovo-authorized repair facility or technician.
Only recharge the battery strictly according to instructions included in the product documentation.
The Lenovo-authorized repair facilities or technicians recycle Lenovo batteries according to local
laws and regulations.
Lithium coin-cell battery notice
DANGER
Danger of explosion if battery is incorrectly replaced.
If the coin-cell battery is not a CRU, do not attempt to replace the coin-cell battery. Replacement of
the battery must be done by a Lenovo-authorized repair facility or technician.
Appendix A. Important safety information 41
The Lenovo-authorized repair facilities or technicians recycle Lenovo batteries according to local
laws and regulations.
When replacing the lithium coin-cell battery, use only the same type or equivalent type that is recommended
by the manufacturer. The battery contains lithium and can explode if not properly used, handled, or disposed
of. Swallowing the lithium coin-cell battery will cause choking or severe internal burns in just two hours and
might even result in death.
Keep batteries away from children. If the lithium coin-cell battery is swallowed or placed inside any part of
the body, seek medical care immediately.
Do not:
• Throw or immerse into water
• Heat to more than 100 °C (212°F).
• Repair or disassemble
• Leave in an extremely low air pressure environment
• Leave in an extremely high-temperature environment
• Crush, puncture, cut, or incinerate
Dispose of the battery as required by local ordinances or regulations.
The following statement applies to users in the state of California, U.S.A.
California Perchlorate Information:
Products containing manganese dioxide lithium coin-cell batteries may contain perchlorate.
Perchlorate Material - special handling may apply, see https://www.dtsc.ca.gov/hazardouswaste/
perchlorate/.
42 Lenovo Yoga C940-15IRH User Guide
Heat and product ventilation
DANGER
Computers, ac power adapters, and many accessories can generate heat when turned on and when
batteries are charging. Notebook computers can generate a significant amount of heat due to their
compact size. Always follow these basic precautions:
• When your computer is turned on or the battery is charging, the base, the palm rest, and some
other parts may become hot. Avoid keeping your hands, your lap, or any other part of your body
in contact with a hot section of the computer for any extended length of time. When you use the
keyboard, avoid keeping your palms on the palm rest for a prolonged period of time. Your
computer generates some heat during normal operation. The amount of heat depends on the
amount of system activity and the battery charge level. Extended contact with your body, even
through clothing, could cause discomfort or even a skin burn. Periodically take breaks from using
the keyboard by lifting your hands from the palm rest; and be careful not to use the keyboard for
any extended length of time.
• Do not operate your computer or charge the battery near flammable materials or in explosive
environments.
• Ventilation slots, fans and/or heat sinks are provided with the product for safety, comfort, and
reliable operation. These features might inadvertently become blocked by placing the product on
a bed, sofa, carpet, or other flexible surface. Never block, cover, or disable these features.
• When the ac power adapter is connected to an electrical outlet and your computer, it generates
heat. Do not place the adapter in contact with any part of your body while using it. Never use the
ac power adapter to warm your body. Extended contact with your body, even through clothing,
may cause a skin burn.
For your safety, always follow these basic precautions with your computer:
• Keep the cover closed whenever the computer is plugged in.
• Regularly inspect the outside of the computer for dust accumulation.
• Remove dust from vents and any perforations in the bezel. More frequent cleanings might be
required for computers in dusty or high-traffic areas.
• Do not restrict or block any ventilation openings.
• Do not operate your computer inside furniture, as this might increase the risk of overheating.
• Airflow temperatures into the computer should not exceed 35°C (95°F).
Appendix A. Important safety information 43
Electrical current safety information
DANGER
Electric current from power, telephone, and communication cables is hazardous.
To avoid a shock hazard:
• Do not use your computer during a lightning storm.
• Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration
of this product during an electrical storm.
• Connect all power cords to a properly wired and grounded electrical outlet.
• Connect properly wired outlets to any equipment that will be attached to this product.
• Whenever possible, use one hand only to connect or disconnect signal cables.
• Never turn on any equipment when there is evidence of fire, water, or structural damage.
• Disconnect the attached power cords, battery, and all the cables before you open the device
covers, unless instructed otherwise in the installation and configuration procedures.
• Do not use your computer until all internal parts enclosures are fastened into place. Never use
the computer when internal parts and circuits are exposed.
DANGER
Connect and disconnect cables as described in the following procedures when installing, moving,
or opening covers on this product or attached devices.
To connect:
1. Turn everything OFF.
2. First, attach all cables to devices.
3. Attach signal cables to connectors.
4. Attach power cords to outlets.
5. Turn devices ON.
To disconnect:
1. Turn everything OFF.
2. First, remove power cords from outlets.
3. Remove signal cables from connectors.
4. Remove all cables from devices.
The power cord must be disconnected from the wall outlet or receptacle before installing all other electrical
cables connected to the computer.
The power cord may be reconnected to the wall outlet or receptacle only after all other electrical cables have
been connected to the computer.
DANGER
During electrical storms, do not perform any replacement and do not connect the telephone cable
to or disconnect it from the telephone outlet on the wall.
44 Lenovo Yoga C940-15IRH User Guide
Liquid crystal display (LCD) notice
CAUTION:
The liquid crystal display (LCD) is made of glass, and rough handling or dropping the computer can
cause the LCD to break. If the LCD breaks and the internal fluid gets into your eyes or on your hands,
immediately wash the affected areas with water for at least 15 minutes; if any symptoms are present
after washing, get medical care.
Note: For products with mercury-containing fluorescent lamps (for example, non-LED), the fluorescent lamp
in the liquid crystal display (LCD) contains mercury; dispose of according to local, state, or federal laws.
Using headphones or earphones
Excessive sound pressure from earphones and headphones can cause hearing loss. Adjustment of the
equalizer to maximum increases the earphone and headphone output voltage and the sound pressure level.
Therefore, to protect your hearing, adjust the equalizer to an appropriate level.
Excessive use of headphones or earphones for a long period of time at high volume can be dangerous if the
output of the headphone or earphone connectors do not comply with specifications of EN 50332-2. The
headphone output connector of your computer complies with EN 50332-2 Sub clause 7. This specification
limits the computer’s maximum wide band true RMS output voltage to 150 mV. To help protect against
hearing loss, ensure that the headphones or earphones you use also comply with EN 50332-2 (Clause 7
limits) for a wide band characteristic voltage of 75 mV. Using headphones that do not comply with EN 50332-
2 can be dangerous due to excessive sound pressure levels.
If your Lenovo computer came with headphones or earphones in the package, as a set, the combination of
the headphones or earphones and the computer already complies with the specifications of EN 50332-1. If
different headphones or earphones are used, ensure that they comply with EN 50332-1 (Clause 6.5
Limitation Values). Using headphones that do not comply with EN 50332-1 can be dangerous due to
excessive sound pressure levels.
Choking hazard notice
CHOKING HAZARD – Product contains small parts.
Keep away from children under three years.
Plastic bag notice
DANGER
Plastic bags can be dangerous. Keep plastic bags away from babies and children to avoid danger of
suffocation.
Appendix A. Important safety information 45
Glass parts notice
CAUTION:
Some parts of your product may be made of glass. This glass could break if the product is dropped on
a hard surface or receives a substantial impact. If glass breaks, do not touch or attempt to remove it.
Stop using your product until the glass is replaced by trained service personnel.
Static electricity prevention
Static electricity, although harmless to you, can seriously damage computer components and options.
Improper handling of static-sensitive parts can damage the part. When you unpack an option or CRU, do not
open the static-protective package containing the part until the instructions direct you to install it.
When you handle options or CRUs, or perform any work inside the computer, take the following precautions
to avoid static-electricity damage:
• Limit your movement. Movement can cause static electricity to build up around you.
• Always handle components carefully. Handle adapters, memory modules, and other circuit boards by the
edges. Never touch exposed circuitry.
• Prevent others from touching components.
• When you install a static-sensitive option or CRU, touch the static-protective package containing the part
to a metal expansion-slot cover or other unpainted metal surface on the computer for at least two
seconds. This reduces static electricity in the package and your body.
• When possible, remove the static-sensitive part from the static-protective packaging and install the part
without setting it down. When this is not possible, place the static-protective packaging on a smooth, level
surface and place the part on it.
• Do not place the part on the computer cover or other metal surface.
46 Lenovo Yoga C940-15IRH User Guide
Appendix B. Accessibility and ergonomic information
This chapter provides information about accessibility and ergonomics.
Accessibility information
Lenovo is committed to providing users who have hearing, vision, and mobility limitations with greater
access to information and technology. This section provides information about the ways these users can get
the most out of their computer experience. You also can get the most up-to-date accessibility information
from the following Web site:
https://www.lenovo.com/accessibility
Keyboard shortcuts
The following list contains keyboard shortcuts that can help make your computer easier to use.
Note: Depending on your keyboard, some of the following keyboard shortcuts might not be available.
• Windows logo key + U: Open Ease of Access Center
• Right Shift for eight seconds: Turn on or turn off Filter Keys
• Shift five times: Turn on or turn off Sticky Keys
• Num Lock for five seconds: Turn on or turn off Toggle Keys
• Left Alt+Left Shift+Num Lock: Turn on or turn off Mouse Keys
• Left Alt+Left Shift+PrtScn (or PrtSc): Turn on or turn off High Contrast
For more information, go to https://windows.microsoft.com/, and then search using any of the following
keywords: keyboard shortcuts, key combinations, shortcut keys.
Ease of Access Center
Ease of Access Center on the Windows operating system enables you to configure your computers to suit
their physical and cognitive needs.
To access Ease of Access Center:
1. Go to Control Panel and view by Category.
2. Click Ease of Access ➙ Ease of Access Center.
3. Choose the appropriate tool by following the on-screen instructions.
Ease of Access Center mainly includes the following tools:
• Magnifier
Magnifier is a useful utility that enlarges the entire screen or part of the screen so that you can see the
items better.
• Narrator
Narrator is a screen reader that reads what is displayed on the screen aloud and describes events such as
error messages.
• On-Screen Keyboard
If you prefer to type or enter data into your computer using a mouse, joystick, or other pointing device
instead of a physical keyboard, you can use On-Screen Keyboard. On-Screen Keyboard displays a visual
© Copyright Lenovo 2019 47
keyboard with all the standard keys. You can select keys using the mouse or another pointing device, or
you can tap to select the keys if your computer supports multi-touch screen.
• High Contrast
High Contrast is a feature that heightens the color contrast of some text and images on your screen. As a
result, those items are more distinct and easier to identify.
• Personalized keyboard
Adjust keyboard settings to make your keyboard easier to use. For example, you can use your keyboard
to control the pointer and make the keyboard easier to type certain key combinations.
• Personalized mouse
Adjust mouse settings to make your mouse easier to use. For example, you can change the pointer
appearance and make your mouse easier to manage windows.
Speech Recognition
Speech Recognition enables you to control your computer by voice.
You can use verbal instructions to control the keyboard and mouse. With verbal instructions, you can start
programs, open menus, click objects on the screen, dictate text into documents, and write and send e-mails.
To use Speech Recognition:
1. Go to Control Panel and view by Category.
2. Click Ease of Access ➙ Speech Recognition.
3. Follow the on-screen instructions.
Screen-reader technologies
Screen-reader technologies are primarily focused on software program interfaces, help systems, and various
online documents. For additional information about screen readers, see the following:
• Using PDFs with screen readers:
https://www.adobe.com/accessibility.html?promoid=DJGVE
• Using the JAWS screen reader:
https://www.freedomscientific.com/Products/Blindness/JAWS
• Using the NVDA screen reader:
https://www.nvaccess.org/
Screen resolution
You can make the text and images on your screen easier to read by adjusting the screen resolution of your
computer.
To adjust the screen resolution:
1. Right-click a blank area on the desktop and then click Display settings ➙ Display.
2. Follow the on-screen instructions.
Note: Setting a resolution too low might prevent some items from fitting on the screen.
Customizable item size
You can make the items on your screen easier to read by changing the item size.
• To change the item size temporarily, use the Magnifier tool in Ease of Access Center.
• To change the item size permanently:
48 Lenovo Yoga C940-15IRH User Guide
– Change the size of all the items on your screen.
1. Right-click a blank area on the desktop and then click Display settings ➙ Display.
2. Change the item size by following the on-screen instructions. For some applications, your
configuration might not take effect until you sign out and then sign in again.
– Change the size of the items on a Web page.
Press and hold Ctrl, and then press the plus-sign key (+) to enlarge or the minus-sign key (–) to reduce
the text size.
– Change the size of the items on the desktop or a window.
Note: This function might not work on some windows.
If your mouse has a wheel, press and hold Ctrl, and then scroll the wheel to change the item size.
Industry-standard connectors
Your computer provides industry-standard connectors that enable you to connect assistive devices.
Documentation in accessible formats
Lenovo provides electronic documentation in accessible formats, such as properly tagged PDF files or
HyperText Markup Language (HTML) files. Lenovo electronic documentation is developed to ensure that
visually impaired users can read the documentation through a screen reader. Each image in the
documentation also includes adequate alternative text so that visually impaired users can understand the
image when they use a screen reader.
Ergonomic information
Good ergonomic practice is important to get the most from your personal computer and to avoid discomfort.
Arrange your workplace and the equipment you use to suit your individual needs and the kind of work that
you perform. In addition, use healthy work habits to maximize your performance and comfort when using
your computer.
Working in the virtual office might mean adapting to frequent changes in your environment. Adapting to the
surrounding light sources, active seating, and the placement of your computer hardware, can help you
improve your performance and achieve greater comfort.
This example shows someone in a conventional setting. Even when not in such a setting, you can follow
many of these tips. Develop good habits, and they will serve you well.
General posture: Make minor modifications in your working posture to deter the onset of discomfort caused
by long periods of working in the same position. Frequent short breaks from your work also help to prevent
minor discomfort associated with your working posture.
Appendix B. Accessibility and ergonomic information 49
Display: Position the display to maintain a comfortable viewing distance of 510 mm to 760 mm (20 inches to
30 inches). Avoid glare or reflections on the display from overhead lighting or outside sources of light. Keep
the display screen clean and set the brightness to levels that enable you to see the screen clearly. Press the
brightness control keys to adjust display brightness.
Head position: Keep your head and neck in a comfortable and neutral (vertical, or upright) position.
Chair: Use a chair that gives you good back support and seat height adjustment. Use chair adjustments to
best suit your comfort posture.
Arm and hand position: If available, use chair arm rests or an area on your working surface to provide
weight support for your arms. Keep your forearms, wrists, and hands in a relaxed and neutral (horizontal)
position. Type with a soft touch without pounding the keys.
Leg position: Keep your thighs parallel to the floor and your feet flat on the floor or on a footrest.
What if you are traveling?
It might not be possible to observe the best ergonomic practices when you are using your computer while on
the move or in a casual setting. Regardless of the setting, try to observe as many of the tips as possible.
Sitting properly and using adequate lighting, for example, helps you maintain desirable levels of comfort and
performance. If your work area is not in an office setting, ensure to take special note of employing active
sitting and taking work breaks. Many product solutions are available to help you modify and expand your
computer to best suit your needs. You can find some of these options at https://www.lenovo.com/accessories.
Explore your options for docking solutions and external products that provide the adjustability and features
that you want.
Questions about vision?
The visual display screens of notebook computers are designed to meet the highest standards. These visual
display screens provide you with clear, crisp images and large, bright displays that are easy to see, yet easy
on the eyes. Any concentrated and sustained visual activity can be tiring. If you have questions on eye
fatigue or visual discomfort, consult a vision-care specialist for advice.
50 Lenovo Yoga C940-15IRH User Guide
Appendix C. Compliance information
This appendix provides the various compliance statements for Lenovo products.
Radio frequency compliance statements
Computer models equipped with wireless communications comply with the radio frequency and safety
standards of any country or region in which it has been approved for wireless use.
Besides this document, ensure that you read the Regulatory Notice for your country or region before using
the wireless devices contained in your computer.
European Union – compliance with the Radio Equipment Directive
This product is in conformity with all the requirements and essential norms that apply to EU Council Radio
Equipment Directive 2014/53/EU on the approximation of the laws of the Member States relating to radio
equipment. The full text of the system EU declaration of conformity and the EU wireless module declarations
are available at the following Internet addresses:
• For notebook computers: https://www.lenovo.com/us/en/social_responsibility/EU_DoC_notebooks
• For tablet computers: https://www.lenovo.com/us/en/social_responsibility/EU_DoC_tablets
• For wireless peripheral devices: https://www.lenovo.com/us/en/social_responsibility/EU_DoC_wireless_
options
Lenovo cannot accept responsibility for any failure to satisfy the protection requirements resulting from a
non-recommended modification of the product, including the installation of option cards from other
manufacturers. This product has been tested and found to comply with the limits for Class B equipment
according to European Standards harmonized in the Directives in compliance. The limits for Class B
equipment were derived for typical residential environments to provide reasonable protection against
interference with licensed communication devices.
FCC ID and IC ID location
If you purchased your computer in the United States or Canada and the computer includes factory-
preinstalled wireless modules, the FCC ID and IC ID label information for the wireless modules are visible on
the computer’s bottom cover.
The following graphic shows the location of the engraved (laser etched) text or the attached non-removable
label.
© Copyright Lenovo 2019 51
Brazil
Este equipamento não tem direito à proteção contra interferência prejudicial e não pode causar interferência
em sistemas devidamente autorizados.
This equipment is not protected against harmful interference and may not cause interference with duly
authorized systems.
Mexico
Advertencia: En Mexico la operación de este equipo está sujeta a las siguientes dos condiciones: (1) es
posible que este equipo o dispositivo no cause interferencia perjudicial y (2) este equipo o dispositivo debe
aceptar cualquier interferencia, incluyendo la que pueda causar su operación no deseada.
Singapore
Korea
무선설비 전파 혼신 (사용주파수 2400∼2483.5 , 5725∼5825 무선제품해당)
해당 무선설비가 전파혼신 가능성이 있으므로 인명안전과 관련된 서비스는 할 수 없음
SAR 정보
본 장치는 전파 노출에 대한 가이드라인을 충족합니다.
본 장치는 무선 송수신기 입니다. 본 장치는 국제 가이드라인으로 권장되는 전파 노출에 대한 제한을 초과하지
않도록 설계되었습니다. 장치 액세서리 및 최신 부품을 사용할 경우 SAR 값이 달라질 수 있 습니다. SAR 값은
52 Lenovo Yoga C940-15IRH User Guide
국가 보고 및 테스트 요구 사항과 네트워크 대역에 따라 다를 수 있습니다. 본 장치 는 사람의 신체에서 20mm
이상의 거리에서 사용할 수 있습니다.
Environmental information by countries and regions
This section provides environmental, recycling, and RoHS information about Lenovo products.
Recycling and environmental information
Lenovo encourages owners of information technology (IT) equipment to responsibly recycle their equipment
when it is no longer needed. Lenovo offers a variety of programs and services to assist equipment owners in
recycling their IT products. For information about recycling Lenovo products, go to:
https://www.lenovo.com/recycling
The latest environmental information about our products is available at:
https://www.lenovo.com/ecodeclaration
Important WEEE information
The WEEE marking on Lenovo products applies to countries with WEEE and e-waste regulations (for
example, the European WEEE Directive, India E-Waste Management Rules). Appliances are labeled in
accordance with local regulations concerning waste electrical and electronic equipment (WEEE). These
regulations determine the framework for the return and recycling of used appliances as applicable within
each geography. This label is applied to various products to indicate that the product is not to be thrown
away, but rather put in the established collection systems for reclaiming these end of life products.
Users of electrical and electronic equipment (EEE) with the WEEE marking must not dispose of end of life
EEE as unsorted municipal waste, but use the collection framework available to them for the return, recycle,
and recovery of WEEE and to minimize any potential effects of EEE on the environment and human health
due to the presence of hazardous substances. Lenovo electrical and electronic equipment (EEE) may contain
parts and components, which at end-of-life might qualify as hazardous waste.
EEE and waste electrical and electronic equipment (WEEE) can be delivered free of charge to the place of
sale or any distributor that sells electrical and electronic equipment of the same nature and function as the
used EEE or WEEE.
For additional WEEE information, go to:
https://www.lenovo.com/recycling
WEEE information for Hungary
Lenovo, as a producer, bears the cost incurred in connection with the fulfillment of Lenovo’s obligations
under Hungary Law No. 197/2014 (VIII.1.) subsections (1)-(5) of section 12.
Appendix C. Compliance information 53
Japan recycling statements
Collecting and recycling a disused Lenovo computer or monitor
If you are a company employee and need to dispose of a Lenovo computer or monitor that is the property of
the company, you must do so in accordance with the Law for Promotion of Effective Utilization of Resources.
Computers and monitors are categorized as industrial waste and should be properly disposed of by an
industrial waste disposal contractor certified by a local government. In accordance with the Law for
Promotion of Effective Utilization of Resources, Lenovo Japan provides, through its PC Collecting and
Recycling Services, for the collecting, reuse, and recycling of disused computers and monitors. For details,
visit the Lenovo Web site at:
https://www.lenovo.com/recycling/japan
Pursuant to the Law for Promotion of Effective Utilization of Resources, the collecting and recycling of home-
used computers and monitors by the manufacturer was begun on October 1, 2003. This service is provided
free of charge for home-used computers sold after October 1, 2003. For details, go to:
https://www.lenovo.com/recycling/japan
Disposing of Lenovo computer components
Some Lenovo computer products sold in Japan may have components that contain heavy metals or other
environmental sensitive substances. To properly dispose of disused components, such as a printed circuit
board or drive, use the methods described above for collecting and recycling a disused computer or monitor.
Disposing of disused lithium batteries from Lenovo computers
A button-shaped lithium battery is installed inside your Lenovo computer to provide power to the computer
clock while the computer is off or disconnected from the main power source. If you need to replace it with a
new one, contact your place of purchase or contact Lenovo for service. If you need to dispose of a disused
lithium battery, insulate it with vinyl tape, contact your place of purchase or an industrial-waste-disposal
operator, and follow their instructions.
Disposal of a lithium battery must comply with local ordinances and regulations.
Disposing of a disused battery from Lenovo notebook computers
Your Lenovo notebook computer has a lithium ion battery or a nickel metal hydride battery. If you are a
company employee who uses a Lenovo notebook computer and need to dispose of a battery, contact the
proper person in Lenovo sales, service, or marketing, and follow that person's instructions. You also can
refer to the instructions at:
https://www.lenovo.com/jp/ja/environment/recycle/battery/
If you use a Lenovo notebook computer at home and need to dispose of a battery, you must comply with
local ordinances and regulations. You also can refer to the instructions at:
https://www.lenovo.com/jp/ja/environment/recycle/battery/
Recycling information for Brazil
Declarações de Reciclagem no Brasil
Descarte de um Produto Lenovo Fora de Uso
54 Lenovo Yoga C940-15IRH User Guide
Equipamentos elétricos e eletrônicos não devem ser descartados em lixo comum, mas enviados à pontos de
coleta, autorizados pelo fabricante do produto para que sejam encaminhados e processados por empresas
especializadas no manuseio de resíduos industriais, devidamente certificadas pelos orgãos ambientais, de
acordo com a legislação local.
A Lenovo possui um canal específico para auxiliá-lo no descarte desses produtos. Caso você possua um
produto Lenovo em situação de descarte, ligue para o nosso SAC ou encaminhe um e-mail para:
reciclar@lenovo.com, informando o modelo, número de série e cidade, a fim de enviarmos as instruções
para o correto descarte do seu produto Lenovo.
Battery recycling information for the European Union
Notice: This mark applies only to countries within the European Union (EU).
Batteries or packaging for batteries are labeled in accordance with European Directive 2006/66/EC
concerning batteries and accumulators and waste batteries and accumulators. The Directive determines the
framework for the return and recycling of used batteries and accumulators as applicable throughout the
European Union. This label is applied to various batteries to indicate that the battery is not to be thrown
away, but rather reclaimed upon end of life per this Directive.
In accordance with the European Directive 2006/66/EC, batteries and accumulators are labeled to indicate
that they are to be collected separately and recycled at end of life. The label on the battery may also include
a chemical symbol for the metal concerned in the battery (Pb for lead, Hg for mercury, and Cd for cadmium).
Users of batteries and accumulators must not dispose of batteries and accumulators as unsorted municipal
waste, but use the collection framework available to customers for the return, recycling, and treatment of
batteries and accumulators. Customer participation is important to minimize any potential effects of batteries
and accumulators on the environment and human health due to the potential presence of hazardous
substances.
Before placing electrical and electronic equipment (EEE) in the waste collection stream or in waste collection
facilities, the end user of equipment containing batteries and/or accumulators must remove those batteries
and accumulators for separate collection.
Disposing of lithium batteries and battery packs from Lenovo products
A coin-cell type lithium battery might be installed inside your Lenovo product. You can find details about the
battery in the product documentation. If the battery needs to be replaced, contact your place of purchase or
contact Lenovo for service. If you need to dispose of a lithium battery, insulate it with vinyl tape, contact your
place of purchase or a waste-disposal operator, and follow their instructions.
Disposing of battery packs from Lenovo products
Your Lenovo device might contain a lithium-ion battery pack or a nickel metal hydride battery pack. You can
find details on the battery pack in the product documentation. If you need to dispose of a battery pack,
insulate it with vinyl tape, contact Lenovo sales, service, or your place of purchase, or a waste-disposal
operator, and follow their instructions. You also can refer to the instructions provided in the user guide for
your product.
Appendix C. Compliance information 55
For proper collection and treatment, go to:
https://www.lenovo.com/lenovo/environment
Recycling information for Mainland China
Battery recycling information for Taiwan
Battery recycling information for the United States and Canada
Restriction of Hazardous Substances (RoHS) Directive by countries and
regions
The latest environmental information about Lenovo products is available at:
https://www.lenovo.com/ecodeclaration
European Union RoHS
This Lenovo product, with included parts (cables, cords, and so on) meets the requirements of Directive
2011/65/EU on the restriction of the use of certain hazardous substances in electrical and electronic
equipment ("RoHS recast" or "RoHS 2").
For more information about Lenovo worldwide compliance on RoHS, go to:
https://www.lenovo.com/rohs-communication
Turkish RoHS
The Lenovo product meets the requirements of the Republic of Turkey Directive on the Restriction of the Use
of Certain Hazardous Substances in Waste Electrical and Electronic Equipment (WEEE).
56 Lenovo Yoga C940-15IRH User Guide
58 Lenovo Yoga C940-15IRH User Guide
Taiwan RoHS
Electromagnetic emission notices
Federal Communications Commission (FCC) Supplier’s Declaration of
Conformity
The following information refers to Lenovo Yoga C940-15IRH, machine type 81TE.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses, and can radiate radio frequency
Appendix C. Compliance information 59
energy and, if not installed and used in accordance with the instructions, may cause harmful interference to
radio communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the interference by
one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult an authorized dealer or service representative for help.
Lenovo is not responsible for any radio or television interference caused by using other than recommended
cables and connectors or by unauthorized changes or modifications to this equipment. Unauthorized
changes or modifications could void the user’s authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1)
this device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
Responsible Party:
Lenovo (United States) Incorporated
7001 Development Drive
Morrisville, NC 27560
Email: FCC@lenovo.com
Industry Canada compliance statement
CAN ICES-3(B)/NMB-3(B)
European Union conformity
EU Contact: Lenovo (Slovakia), Landererova 12, 811 09 Bratislava, Slovakia
Compliance with the EMC Directive
This product is in conformity with the protection requirements of EU Council Directive 2014/30/EU on the
approximation of the laws of the Member States relating to electromagnetic compatibility.
This product has been tested and found to comply with the limits for Class B equipment according to
European Standards harmonized in the Directives in compliance. The Class B requirements for equipment
are intended to offer adequate protection to broadcast services within residential environments.
EU ErP (EcoDesign) Directive (2009/125/EC) - external power adapters (Regulation (EU) 2019/1782)
Lenovo products are designed to work with a range of compatible power adapters. Access https://
www.lenovo.com/us/en/compliance/eu-doc to view the compatible power adapters. For the detailed power
adapter specifications for your computer, go to https://support.lenovo.com.
German Class B compliance statement
Hinweis zur Einhaltung der Klasse B zur elektromagnetischen Verträglichkeit
60 Lenovo Yoga C940-15IRH User Guide
Dieses Produkt entspricht den Schutzanforderungen der EU-Richtlinie zur elektromagnetischen
Verträglichkeit Angleichung der Rechtsvorschriften über die elektromagnetische Verträglichkeit in den EU-
Mitgliedsstaaten und hält die Grenzwerte der Klasse B der Norm gemäß Richtlinie.
Um dieses sicherzustellen, sind die Geräte wie in den Handbüchern beschrieben zu installieren und zu
betreiben. Des Weiteren dürfen auch nur von der Lenovo empfohlene Kabel angeschlossen werden. Lenovo
übernimmt keine Verantwortung für die Einhaltung der Schutzanforderungen, wenn das Produkt ohne
Zustimmung der Lenovo verändert bzw. wenn Erweiterungskomponenten von Fremdherstellern ohne
Empfehlung der Lenovo gesteckt/eingebaut werden.
Zulassungsbescheinigung laut dem Deutschen Gesetz über die elektromagnetische Verträglichkeit von
Betriebsmitteln, EMVG vom 20. Juli 2007 (früher Gesetz über die elektromagnetische Verträglichkeit von
Geräten), bzw. der EU Richtlinie 2014/30/EU, der EU Richtlinie 2014/53/EU Artikel 3.1b), für Geräte der
Klasse B.
Dieses Gerät ist berechtigt, in Übereinstimmung mit dem Deutschen EMVG das EG-Konformitätszeichen -
CE - zu führen. Verantwortlich für die Konformitätserklärung nach Paragraf 5 des EMVG ist die Lenovo
(Deutschland) GmbH, Meitnerstr. 9, D-70563 Stuttgart.
Japan VCCI Class B compliance statement
Japan compliance statement for products which connect to the power
mains with rated current less than or equal to 20 A per phase
Japan notice for ac power cord
The ac power cord shipped with your product can be used only for this specific product. Do not use the ac
power cord for other devices.
Other compliance information
This section provides other compliance information about Lenovo products.
Export classification notice
This product is subject to the United States Export Administration Regulations (EAR) and has an Export
Classification Control Number (ECCN) of 5A992.c. It can be re-exported except to any of the embargoed
countries in the EAR E1 country list.
Lenovo product service information for Taiwan
Appendix C. Compliance information 61
Taiwan precautionary vision statement
警語：使用過度恐傷害視力
注意事項：
• 使用30分鐘請休息10分鐘。
• 未滿2歲幼兒不看螢幕，2歲以上每天看螢幕不要超過1小時。
Supplemental information for the Eurasian Union
Назначение
персональный компьютер для личного и служебного использования, для
передачи данных, с поддержкой различных профилей подключения (Wi-Fi,
Bluetooth и пр.).
Изготовитель
Леново ПЦ ХК Лимитед, 23/Ф Линколн Хаус, Тайку Плэйс 979 Кингз Роуд,
Куарри Бэй, Гонконг (Lenovo PC HK Limited, 23/F Lincoln House, Taikoo Place
979 King's Road, Quarry Bay, Hong Kong)
Страна производства Китай
Наименование и
местонахождение
уполномоченного
изготовителем лица
ООО «Леново (Восточная Европа/Азия)» 143401, Московская область, г.
Красногорск, бульвар Строителей, дом 4, корпус 1, помещение VII, тел. +7
495 645 83 38, факс +7 495 645 78 77.
Импортер
Наименование, адрес импортера и информация для связи с ним указаны на
этикетке* на упаковке продукции.
*Согласно ГОСТ 2.601-2013 «Единая система конструкторской документации.
Эксплуатационные документы», пункт 5.1, подпункт 5.1.2, этикетка является
видом эксплуатационных документов.
Дата изготовления (месяц и
год)
Указана на этикетке* на упаковке продукции, в графе Date (дата указана в
формате год-месяц-дата). Для получения более подробной информации
посетите веб-сайт: https://support.lenovo.com
Единый знак обращения на
рынке стран Таможенного
союза
Brazil audio notice
Ouvir sons com mais de 85 decibéis por longos períodos pode provocar danos ao sistema auditivo.
ENERGY STAR
ENERGY STAR is a joint program of the U.S. Environmental Protection Agency and the U.S. Department of
Energy aimed at saving money and protecting the environment through energy efficient products and
practices.
62 Lenovo Yoga C940-15IRH User Guide
Lenovo is proud to offer products with the ENERGY STAR certified designation. Lenovo computers, if carry
an ENERGY STAR mark, have been designed and tested to conform to the ENERGY STAR program
requirements for computers as prescribed by the U.S. Environmental Protection Agency. For certified
computers, an ENERGY STAR mark may be affixed to the product, the product packaging, or displayed
electronically on the E-label screen or the power settings interface.
By using ENERGY STAR compliant products and taking advantage of the power management features of
your computer, you reduce the consumption of electricity. Reduced electrical consumption contributes to
potential financial savings, a cleaner environment, and the reduction of greenhouse gas emissions. For more
information about ENERGY STAR, go to https://www.energystar.gov
Lenovo encourages you to make efficient use of energy an integral part of your day-to-day operations. To
help in this endeavor, Lenovo has preset the following power-management features to take effect when your
computer has been inactive for a specified length of time.
Table 4. Balanced (when plugged into ac power)
• Turn off the display: After 10 minutes
• Put the computer to sleep: After 10 minutes
Appendix C. Compliance information 63
64 Lenovo Yoga C940-15IRH User Guide
Appendix D. Notices and trademarks
Notices
Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult
your local Lenovo representative for information on the products and services currently available in your
area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that
Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service
that does not infringe any Lenovo intellectual property right may be used instead. However, it is the user's
responsibility to evaluate and verify the operation of any other product, program, or service.
Lenovo may have patents or pending patent programs covering subject matter described in this document.
The furnishing of this document does not give you any license to these patents. You can send license
inquiries, in writing, to:
Lenovo (United States), Inc.
1009 Think Place - Building One
Morrisville, NC 27560
U.S.A.
Attention: Lenovo Director of Licensing
LENOVO PROVIDES THIS PUBLICATION "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF NON-INFRINGEMENT,
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do not allow
disclaimer of express or implied warranties in certain transactions, therefore, this statement may not apply to
you.
Changes are made periodically to the information herein; these changes will be incorporated in new editions
of the publication. To provide better service, Lenovo reserves the right to improve and/or modify the
products and software programs described in the manuals included with your computer, and the content of
the manual, at any time without additional notice.
The software interface and function and hardware configuration described in the manuals included with your
computer might not match exactly the actual configuration of the computer that you purchase. For the
configuration of the product, refer to the related contract (if any) or product packing list, or consult the
distributor for the product sales. Lenovo may use or distribute any of the information you supply in any way it
believes appropriate without incurring any obligation to you.
The products described in this document are not intended for use in implantation or other life support
applications where malfunction may result in injury or death to persons. The information contained in this
document does not affect or change Lenovo product specifications or warranties. Nothing in this document
shall operate as an express or implied license or indemnity under the intellectual property rights of Lenovo or
third parties. All information contained in this document was obtained in specific environments and is
presented as an illustration. The result obtained in other operating environments may vary.
Lenovo may use or distribute any of the information you supply in any way it believes appropriate without
incurring any obligation to you.
Any references in this publication to non-Lenovo Web sites are provided for convenience only and do not in
any manner serve as an endorsement of those Web sites. The materials at those Web sites are not part of the
materials for this Lenovo product, and use of those Web sites is at your own risk.
© Copyright Lenovo 2019 65
Any performance data contained herein was determined in a controlled environment. Therefore, the result
obtained in other operating environments may vary significantly. Some measurements may have been made
on development-level systems and there is no guarantee that these measurements will be the same on
generally available systems. Furthermore, some measurements may have been estimated through
extrapolation. Actual results may vary. Users of this document should verify the applicable data for their
specific environment.
This document is copyrighted by Lenovo and is not covered by any open source license, including any Linux
agreement(s) which may accompany software included with this product. Lenovo may update this document
at any time without notice.
For the latest information or any questions or comments, contact or visit the Lenovo Web site:
https://support.lenovo.com
Trademarks
LENOVO and the LENOVO logo are trademarks of Lenovo. Thunderbolt is a trademark of Intel Corporation or
its subsidiaries in the U.S. and/or other countries. Microsoft, Windows, OneDrive, Outlook, Skype, Office
365, Direct3D, and Cortana are trademarks of the Microsoft group of companies. DisplayPort is a trademark
of the Video Electronics Standards Association. Wi-Fi and Miracast are registered trademarks of Wi-Fi
Alliance. USB-C is a trademark of USB Implementers Forum. All other trademarks are the property of their
respective owners. © 2019 Lenovo.
66 Lenovo Yoga C940-15IRH User Guide