Lenovo Yoga A940WC User manual

Yoga A940
User Guide

First Edition (October 2018)
© Copyright Lenovo 2018
LENOVO products, data, computer software, and services have been developed
exclusively at private expense and are sold to governmental entities as commercial items
as defined by 48 C.F.R. 2.101 with limited and restricted rights to use, reproduction and
disclosure.
LIMITED AND RESTRICTED RIGHTS NOTICE: If products, data, computer software, or
services are 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.
NOTE:
Before using this information and the product it supports, ensure that you read and
understand the following:
• Safety and Warranty Guide
• Setup Guide
• “Importantsafetyinformation”onpage18
Lenovo makes constant improvements on the documentation of your computer,
including this User Guide. To get all the latest documents, go to:
https://support.lenovo.com

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Contents
Meeting your computer..............................................1
Front view ........................................................................................1
Rear view.........................................................................................3
Left view ..........................................................................................4
Right view .......................................................................................5
Peripheral devices............................................................................6
Touch screen instructions ........................................ 10
Touch screen calibration ................................................................10
Using touch screen........................................................................10
Troubleshooting and confirming setup....................12
Solving problems ...........................................................................12
Troubleshooting display problems ..................................................12
Troubleshooting audio problems ....................................................13
Troubleshooting software problems................................................14
Troubleshooting problems with optical drives and hard disks .........14
Special considerations for troubleshooting Windows......................15
Windows help system....................................................................16
BIOS setup utility ...........................................................................16
Performing daily maintenance tasks ...............................................17
Important safety information ...................................18
Conditions that require immediate action .......................................19
General safety guidelines ...............................................................20
Electrical current safety information................................................27

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Lithium battery notice.....................................................................28
Modem safety information..............................................................28
Laser compliance statement ..........................................................29
Power supply statement ................................................................29
Power cord notice..........................................................................30
Products with television tuner options installed...............................31
Data safety.....................................................................................32
Cleaning and maintenance.............................................................33
Using headphones or earphones ...................................................33
Plastic bag notice ..........................................................................34
Tip-over hazard prevention notice ..................................................34
Additional safety information ..........................................................35
Important safety information for service technicians .......................38
Service and support information .............................49
Downloading publications ..............................................................49
Lenovo limited warranty...........................................50
Part 1 – General terms ...................................................................50
Part 2 – Country-specific terms......................................................54
Part 3 – Warranty service information.............................................58
Notices...................................................................... 60
Declaration.....................................................................................60
Electronic emissions notices ..........................................................61
Regulatory information ...................................................................65
Compliance information .................................................................65
Mainland China RoHS....................................................................65
Taiwan RoHS .................................................................................66
Turkish statement of compliance....................................................67

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Ukraine RoHS statement................................................................67
India RoHS statement....................................................................67
Waste electrical and electronic equipment (WEEE) notices .............68
Eurasian compliance mark .............................................................71
ENERGY STAR information............................................................71
Enabling ErP compliance mode .....................................................72
Export Classification Notice............................................................73
Legal notices ............................................................74
Trademarks....................................................................................74

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Microphones
Camera indicator
Camera cover slider
Camera
(standard or Windows Hello
compatible)
Display
(with multi-touch function)
Speakers
(with Bluetooth connectivity)
Camera cover slider
Move this slider to cover or uncover the camera lens.
NOTE:
It is designed to protect your privacy. If you see a red dot, the lens is covered.
Meeting your computer
Front view

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Camera (standard or Windows Hello compatible)
Select models include a Windows Hello compatible camera.
Speakers (with Bluetooth connectivity)
The speakers have separate Bluetooth connection capability. In addition to providing
audio output for the computer, the speakers can be paired with Bluetooth-enabled
smartphones and provide audio output for them.
Paring the speakers with a smartphone
1. Turn on Bluetooth on your smartphone.
NOTE:
You don’t have to turn on the computer. However, it must be plugged into a working electrical
outlet.
2. In the Bluetooth device list, look for “Yoga A940 BT SPK-xxxxx,” where “xxxxx” is a
model-specific ID number.
NOTE:
If you cannot find the device name, the speakers have already been paired with another
smartphone. Hold down the LED lamp button for at least 5 seconds to clear the paring. Refer to
“Right view” for the location of the LED lamp button.
3. Select the device name, enter the PIN code "1111" when prompted.

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Rear view
Air vents
Monitor/computer mode switch
Power connector
Ethernet connector
HDMI in/out connector
USB 3.1 Gen 1 connectors
Air vents
ATTENTION:
Do not block the air vents. Otherwise, the computer might overheat.
Monitor/computer mode switch
Switches what is displayed on the computer screen (computer/HDMI input).

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Left view
USB 2.0 connector
Thunderbolt 3 (USB-C) connector
USB 3.1 Gen 2 connector
Memory card slot
Combo audio jack
Power button (with indicator)
Thunderbolt 3 (USB-C) connector
With a compatible cable, it can connect to external display devices. The connector also
can be used to connect devices for data transfer.
Combo audio jack
NOTES:
• The combo audio jack does not support conventional microphones.
• Therecordingfunctionmaynotbesupportedifthirdpartyheadphonesorheadsetsare
connected, due to different industry standards.

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Right view
USB 2.0 connector
LED lamp button
LED lamp
Speakers
LED lamp button
Turns on/off or adjusts the brightness of the LED lamp .

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Peripheral devices
NOTE:
Your computer may not come with all the listed devices.
Lenovo Dial
Wireless mouse and keyboard
Wireless charging pad
Lenovo Digital Pen
Wireless mouse and keyboard
Read the documentation that came with the keyboard and mouse for usage
instructions.

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Lenovo Dial
Designed specifically for Yoga A940, Lenovo Dial includes a press button and two rotating
rings. When connected with the computer, it can be used to quickly change certain
settings or run certain commands.
NOTE:
Lenovo Dial is supported by some Adobe and Microsoft Office applications.
Press button
Outer rotating ring
360° LED light
Inner rotating ring
Connector
When you start different supported applications, the color of the dial's LED light changes
accordingly.
Adobe Illustrator
Adobe Photoshop Microsoft PowerPoint
Adobe Premier Pro
Microsoft Excel
Adobe Lightroom Unsupported Programs/
Windows Desktop
Microsoft Word

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Setting up button and ring functions
For each of the supported applications, you can set up functions for the dial’s press
button and two rotating rings.
1. Insert the dial into either of the two USB 2.0 connectors.
OR
2. Start a supported application.
3. Press and hold the button until vibration occurs. The settings page is displayed.
4. Press the button or rotate the rings to select a target command from the respective
lists.
5. Press and hold the button to exit the settings page.
Wireless charging pad
You can use the wireless charging pad to charge phones that support wireless charging.
Wireless charging pad — indicator status
Indicator status Meaning
Blinking white The phone is being charged
Solid amber Charging error occurs
Off No compatible phone is detected
NOTE:
Place your phone in the center of the pad. If the indicator is amber, adjust the phone’s position
and remove metal objects on or near the pad.

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Lenovo Digital Pen
Lenovo Digital Pen uses AAAA battery. The battery may or may not ship with the pen.
If the pen ships with an AAAA battery, check and remove an insulation pad before first
use.
ATTENTION:
Use and replace with the correct battery type.
Top button
Bottom button
Tip
Button functions of Lenovo Digital Pen
The table below lists Lenovo Digital Pen's button functions for some popular
applications. To use the eraser function, hold down the bottom button and tap on the
strokes you want to erase.
Lenovo Digital Pen — button functions
Application Top button Bottom button
Microsoft Word No function Eraser
Paint Color 2 No function
Microsoft Edge No function Eraser
Microsoft OneNote No function Eraser
Sticky Notes No function Eraser
Sketchpad No function Eraser
Screen sketch No function Eraser
NOTE:
Sticky Notes, Sketchpad, and Screen sketch are three applications provided with Windows Ink
Workspace.

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Touch screen instructions
ATTENTION:
Touch screens are only available on some models.
The monitor is touch-sensitive thanks to its touch-sensitive screen. A touch screen is
an input device just like a mouse or a keyboard, and the user’s fingers transmit position
information via the touch screen to the computer. With this technology, you only need
to touch the pictures or words on the computer display lightly with your finger, and the
computer will react.
Touch screen calibration
Prior to first use or whenever the touch screen reacts in a different place where you are
touching it, start the calibration program. The procedure is as follows:
• EnterTablet PC Setting into the search box on the taskbar, then click Calibrate to
start the program.
• Toperformcalibration,useyourngeroratouchpenwithadiameterofover9mm
to touch each of the calibration points shown in sequence.
Using touch screen
NOTE:
Refer to Get Started to learn more about how to use the touch screen. Enter Get
Started into the search box on the taskbar, then select Touch and keyboard for
additional information.
Other touch screen settings
• EnterPen and Touch into the search box on the taskbar.
• Selectthetouchactionsyouwanttoadjust.ClickonSettings to adjust the Speed
and Spatial tolerance parameters to match the user’s natural way of double-
tapping. Double-tap the graphic in the lower right-hand corner of the window to test
the settings.

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Precautions when using the touch screen
1. When using the touch screen, be careful not to tear the surface with any sharp
objects.
2. To ensure normal use of the touch screen, ensure that both the screen surface and
your fingers are clean and dry.
3. To ensure precise positioning on the touch screen, avoid handling or touching the
glass frame when you are touching the screen.
4. Turn the computer off for safety before cleaning the screen and frame with a soft
cotton cloth. Do not wipe it with a wet cloth as this may leave a water mark and
affect touch operation.
5. Do not place or drop anything on the four corners or frame of the screen. This could
separate the screen from the frame and prevent the screen sensing properly. Please
avoid leaving water and dust in the gap between the casing and glass when you are
cleaning the frame.
6. Avoid using the touch screen in dusty environments or hot or humid conditions. Any
abrupt temperature change may cause condensation on the inside surface of the
glass screen. This condensation will disappear after a short time and does not affect
normal use.
7. Do not spray any liquid or cleaner directly onto the touch screen.
8. Do not use solvents or industrial alcohol-based cleaners.
9. Avoid using the computer in strong sunlight, which will affect the function of the
touch screen.
10. Recognition of touch gestures can be influenced by the following:
• Touchingthecorrectplaceonthescreen.
• Thespeedofmovement.
• Thetimeintervalfromwhenthescreenwaslasttouched.
11. The touch screen also does not function during the startup process, in Hibernate
mode and in Sleep mode or Safe mode.
12. Do not touch the screen with your finger or any other objects during the computer
startup or wake up process.

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Troubleshooting and
confirming setup
Solving problems
Follow these tips when troubleshooting your computer:
• Ifyouaddedorremovedapartbeforetheproblemstarted,reviewtheinstallation
procedures to ensure that the part is correctly installed.
• Ifaperipheraldevicedoesnotwork,ensurethatthedeviceisproperlyconnected.
• Ifanerrormessageappearsonthescreen,writedowntheexactmessage.
This message may help support personnel diagnose and fix the problem(s).
• Ifanerrormessageoccursinaprogram,seetheHelpdocumentofthatprogram.
Troubleshooting display problems
Problem: Blank screen or no image is displayed on the monitor.
Troubleshooting and problem resolution:
1 Check to see if the monitor has been turned on; if not, press the Power button.
2. Check to see if the monitor power cord is loose; if so, plug the power cord securely
into the monitor.
3. Check to see if the signal cable to the monitor is securely connected to the
connector on the computer graphics card; if not, shut down the computer then
connect the signal cable of the monitor securely to the connector on the computer
graphics card.

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Problem: You need to change the display property settings.
Setting display background and icon properties:
1. Right-click the desktop anywhere except over an icon, then select Personalize from
the pop-up menu.
2. From here, select the appropriate options to:
• Changethedesktopbackground
• Selectascreensaver
• SelectWindowscoloroptionsforbordersandtaskbar
• Selectatheme
3. Right-click the desktop anywhere except over an icon, then select Display settings
from the pop-up menu to change the appearance.
Problem: Ripple on screen.
Troubleshooting and problem resolution:
1. Check to see if any of the following devices are located less than one meter from
the computer: refrigerators, electric fans, electric dryers, UPS systems, regulators,
fluorescent lamps or other computers that may be generating magnetic interference.
2. Move any interfering devices away from the computer.
3. If the problem persists, contact Lenovo Service.
Troubleshooting audio problems
Problem: No sound from the integrated speakers.
Troubleshooting and problem resolution:
• AdjusttheWindowsvolumecontrol:selectthespeakericonfromthetaskbar.Ensure
that the volume is turned up and the sound is not muted. Adjust the volume, bass, or
treble controls to eliminate distortion.
• Reinstalltheaudiodriver.
• Disconnectanyheadphonesfromtheheadphoneconnector:soundfromthe
speakers is automatically disabled when headphones are connected to the
computer’s side-panel headphone connector.
Problem: No sound from headphones.
Troubleshooting and problem resolution:
• Checktheheadphonecableconnection:ensurethattheheadphonecableis
securely inserted into the headphone connector.
• AdjusttheWindowsvolumecontrol:selectthespeakericonfromthetaskbar.
Ensure that the volume is turned up and the sound is not muted.

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Troubleshooting software problems
Problem: You are unable to exit a running program normally.
Troubleshooting and problem resolution:
1. Press the Ctrl, Alt and Delete keys at the same time, then select the Task Manager
option from the Windows logon screen.
2. Select the problem program, then click the End Task button.
Problem: You need to install or uninstall a program.
Problem resolution:
During installation never abort the install process by powering the system off or
through other drastic means. This can cause system program problems or even failure
during system initialization.
During the uninstall process, never directly delete the files or folders. This is harmful
to the operating system, and might cause a system-wide malfunction. Use the following
procedure to properly uninstall programs:
1. Back up all documents and system settings related to the program before removing
it.
2. If the program has its own uninstaller, run it directly to uninstall the program.
3. If the program does not have its own uninstaller, use the search box on the taskbar
to open the Control Panel.
4. From the Control Panel, choose Programs →Programs and Features.
5. Find the program in the Programs and Features dialog box and then select
Uninstall/Change.
6. Follow the prompts displayed to uninstall the software.
Troubleshooting problems with optical
drives and hard disks
Problem: The optical drive is unable to read a CD/DVD.
Troubleshooting and problem resolution:
1. Check to see if there is an optical drive icon in the resource manager of the operating
system. If not, restart your computer. If there is still no icon, contact Lenovo Service.
Otherwise, continue with the next step of this procedure.
2. Confirm that the CD/DVD has been properly placed in the drive. If not, reload the CD
or DVD. Otherwise, continue with the next step of this procedure.
3. Check the specifications that came with your computer to confirm that this optical
drive is capable of reading this type of CD or DVD.

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4. If the CD/DVD cannot be read, replace it with a known good CD/DVD such as one
that was shipped with the computer.
5. If the known good CD cannot be read, visually check the operating side of the CD/
DVD for defects.
Problem: The capacity of the hard disk, as indicated by the system, is less than the
nominal capacity.
Troubleshooting and problem resolution: For computers equipped with the OneKey
Recovery feature, the system recovery feature needs to occupy some hard disk space.
This may account for the apparent hard disk capacity deficit.
Further technical explanation: The nominal capacity of the hard disk is expressed in
the decimal system as 1000 bytes. But the actual hard disk capacity is expressed in the
binary system as 1024 bytes (For example, the nominal capacity 1G is 1000M, while the
actual capacity 1G is 1024M).
The capacity of the hard disk shown in Windows can be calculated according to the
calculations in the following example:
The nominal capacity of the hard disk is 40G, while its actual capacity should be:
40G x 1000 x 1000 x 1000/(1024 x 1024 x 1024) = 37G.
The capacity of the hard disk shown in the system can be obtained by
subtracting the service partition:
3G x 1000 x 1000 x 1000/(1024 x 1024 x 1024) = 2.79G.
The capacity of the hard disk as calculated using this method may be slightly different
from the actual capacity due to the rounding of totals.
Special considerations for
troubleshooting Windows
Record the following information as it may be useful later when troubleshooting system
problems:
The drivers for this computer model only support the Windows 10 system.
Problem: The operating system fails to start up.
Troubleshooting and problem resolution:
If the computer is installed with an Optane memory:
• EnsurethattheOptanememoryisnotremoved.
• ChecktheOptanememoryusingthediagnostictoolthatispreinstalledinyour
computer, to ensure it is not damaged.