Chromebook 11 3180 Disassembly and Reassembly Guide - For use by Dell Certified Technicians only
Working on your computer
Removing and installing components
Product Specification
Software
Technology and components
Diagnostic and troubleshooting
Contacting Dell

DELL 3180 User Manual

Displayed below is the user manual for 3180 by DELL which is a product in the Notebooks category. This manual has pages.

Related Manuals

DELL 3180 Manual

Chromebook 11 3180

Disassembly and Reassembly Guide - For use by Dell

Certied Technicians only

Regulatory Model: P26T

Regulatory Type: P26T002

Notes, cautions, and warnings

NOTE: A NOTE indicates important information that helps you make better use of your product.

CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.

WARNING: A WARNING indicates a potential for property damage, personal injury, or death.

may be trademarks of their respective owners.

2017 - 02

Rev. A00

Contents

1 Working on your computer............................................................................................................................. 6

Safety instructions............................................................................................................................................................. 6

Before working inside your computer..............................................................................................................................6

After working inside your computer.................................................................................................................................7

2 Removing and installing components............................................................................................................. 8

Recommended tools.......................................................................................................................................................... 8

microSD card...................................................................................................................................................................... 8

Removing microSD card..............................................................................................................................................8

Installing microSD card................................................................................................................................................ 8

Base cover.......................................................................................................................................................................... 8

Removing base cover.................................................................................................................................................. 8

Installing base cover................................................................................................................................................... 10

Battery............................................................................................................................................................................... 10

Removing battery....................................................................................................................................................... 10

Installing battery..........................................................................................................................................................10

Keyboard.............................................................................................................................................................................11

Removing keyboard.....................................................................................................................................................11

Installing keyboard...................................................................................................................................................... 12

Audio board........................................................................................................................................................................13

Removing audio board................................................................................................................................................13

Installing audio board.................................................................................................................................................. 13

Power connector port......................................................................................................................................................14

Removing power connector port..............................................................................................................................14

Installing power connector port................................................................................................................................ 14

Speaker..............................................................................................................................................................................15

Removing speaker...................................................................................................................................................... 15

Installing speakers.......................................................................................................................................................16

Touchpad panel.................................................................................................................................................................16

Removing touchpad................................................................................................................................................... 16

Installing touchpad......................................................................................................................................................18

System board.................................................................................................................................................................... 18

Removing system board............................................................................................................................................ 18

Installing system board...............................................................................................................................................21

Display assembly............................................................................................................................................................... 21

Removing display assembly....................................................................................................................................... 21

Installing display assembly.........................................................................................................................................23

Display bezel..................................................................................................................................................................... 24

Removing display bezel............................................................................................................................................. 24

Installing display bezel................................................................................................................................................24

Display panel.....................................................................................................................................................................25

Removing display panel............................................................................................................................................. 25

Installing display panel................................................................................................................................................26

Contents 3

Display hinges...................................................................................................................................................................26

Removing display hinge.............................................................................................................................................26

Installing display hinge................................................................................................................................................27

Camera.............................................................................................................................................................................. 27

Removing camera.......................................................................................................................................................27

Display back cover..................................................................................................................................................... 28

Installing display back cover......................................................................................................................................30

Installing camera.........................................................................................................................................................30

Palm rest............................................................................................................................................................................ 31

Replacing palm rest.................................................................................................................................................... 31

3 Product Specication.................................................................................................................................. 33

4 Software......................................................................................................................................................35

Operating system.............................................................................................................................................................35

Chrome OS................................................................................................................................................................. 35

Veried Boot...............................................................................................................................................................36

Disk Partition Map......................................................................................................................................................37

Developer and Recovery mode................................................................................................................................ 38

Coreboot + U-boot Custom Firmware.................................................................................................................... 38

Chrome vs Chromium OS.........................................................................................................................................39

View system information.................................................................................................................................................39

Dell activity light...............................................................................................................................................................42

Overview.....................................................................................................................................................................42

Raise your Hand/Answer Question/Discussion buttons.......................................................................................43

MultiColor Poll ........................................................................................................................................................... 44

5 Technology and components....................................................................................................................... 45

Keyboard........................................................................................................................................................................... 45

Keyboard keys function.............................................................................................................................................45

Touchpad...........................................................................................................................................................................47

Integrated microphone.................................................................................................................................................... 48

Key features................................................................................................................................................................48

Typical applications.................................................................................................................................................... 48

Bluetooth...........................................................................................................................................................................48

6 Diagnostic and troubleshooting................................................................................................................... 50

Basic troubleshooting......................................................................................................................................................50

Power issues...............................................................................................................................................................50

CROSH..............................................................................................................................................................................54

CROSH commands......................................................................................................................................................... 55

Chrome commands..........................................................................................................................................................57

Commonly used CROSH command.............................................................................................................................. 63

Check battery charging status.................................................................................................................................63

Reset Chromebook.......................................................................................................................................................... 70

Recovery Chromebook....................................................................................................................................................75

Recovering the Chromebook....................................................................................................................................75

4Contents

7 Contacting Dell............................................................................................................................................ 79

Contents 5

Working on your computer

Safety instructions

Use the following safety guidelines to protect your computer from potential damage and to ensure your personal safety. Unless otherwise

noted, each procedure included in this document assumes that the following conditions exist:

• You have read the safety information that shipped with your computer.

• A component can be replaced or, if purchased separately, installed by performing the removal procedure in reverse order.

WARNING: Disconnect all power sources before opening the computer cover or panels. After you nish working inside the

computer, replace all covers, panels, and screws before connecting to the power source.

WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional

safety best practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance

CAUTION: Many repairs may only be done by a certied service technician. You should only perform troubleshooting and simple

repairs as authorized in your product documentation, or as directed by the online or telephone service and support team. Damage

due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow the safety instructions that came

with the product.

CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an

unpainted metal surface, such as a connector on the back of the computer.

CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by its

edges or by its metal mounting bracket. Hold a component such as a processor by its edges, not by its pins.

CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself. Some cables have

connectors with locking tabs; if you are disconnecting this type of cable, press in on the locking tabs before you disconnect the

cable. As you pull connectors apart, keep them evenly aligned to avoid bending any connector pins. Also, before you connect a

cable, ensure that both connectors are correctly oriented and aligned.

NOTE: The color of your computer and certain components may appear dierently than shown in this document.

Before working inside your computer

1 Ensure that your work surface is at and clean to prevent the computer cover from being scratched.

2 Turn o your computer.

3 If the computer is connected to a docking device (docked), undock it.

CAUTION: To disconnect a network cable, rst unplug the cable from your computer and then unplug the cable from

the network device.

4 Disconnect all network cables from the computer.

5 Disconnect your computer and all attached devices from their electrical outlets.

6 Close the display and turn the computer upside-down on a at work surface.

NOTE: To avoid damaging the system board, you must remove the main battery before you service the computer.

7 Remove the base cover.

8 Remove the main battery.

9 Turn the computer top-side up.

10 Open the display.

6 Working on your computer

11 Press and hold the power button for few seconds, to ground the system board.

CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the

display.

CAUTION: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface,

such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to

dissipate static electricity, which could harm internal components.

12 Remove any installed ExpressCards or Smart Cards from the appropriate slots.

After working inside your computer

After you complete any replacement procedure, ensure you connect any external devices, cards, and cables before turning on your

computer.

CAUTION: To avoid damage to the computer, use only the battery designed for this particular Dell computer. Do not use batteries

designed for other Dell computers.

1 Replace the battery.

2 Replace the base cover.

3 Connect any external devices, such as a port replicator or media base, and replace any cards, such as an ExpressCard.

4 Connect any telephone or network cables to your computer.

CAUTION: To connect a network cable, rst plug the cable into the network device and then plug it into the

computer.

5 Connect your computer and all attached devices to their electrical outlets.

6 Turn on your computer.

Working on your computer 7

Removing and installing components

This section provides detailed information on how to remove or install the components from your computer.

Recommended tools

The procedures in this document require the following tools:

• Phillips #0 screwdriver

• Phillips #1 screwdriver

• Plastic scribe

microSD card

Removing microSD card

1 Follow the procedure in Before working inside your computer.

2 Press in on the microSD card to release it from the computer.

3 Remove the microSD card from the computer.

Installing microSD card

1 Slide the SD card into its slot until it clicks into place.

2 Install the microSD card.

3 Follow the procedure in After working inside your computer.

Base cover

Removing base cover

1 Follow the procedure in Before working inside your computer.

2 Remove the microSD card.

3 To remove the base cover:

a Remove the mylar cap [1].

NOTE: The screw cover on the base cover is made up of a mylar sticker. To remove this screw, use a regular

philips driver and puncture the mylar cover. Once the mylar caps are removed it cannot replaced, and the

screws will be exposed from that point forward.

b Loosen the M2.5x7 captive screws that secure the base cover to the computer [2] .

8 Removing and installing components

c Pry the base cover from the edge.

NOTE: You may need a 3c plastic scribe to pry the base cover from the edge.

4 Lift the base cover away from the computer.

Removing and installing components 9

Installing base cover

1 Toe in the base cover front edge into the system.

2 Press the edges of the cover until it clicks into place.

3 Replace the M2.5x7 screws to secure the base cover to the computer.

4 Install the microSD card

5 Follow the procedure in After working inside your computer.

Battery

Removing battery

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

3 To remove the battery:

a Disconnect the battery cable from the connector on the system board [1].

b Remove the M2.0x3.0 screws that secure the battery to the computer [2].

c Lift the battery away from the computer [3].

Installing battery

1 Insert the battery into the slot on the computer.

2 Connect the battery cable to the connector on the battery.

10 Removing and installing components

3 Replace the M2.0x3.0 screws to secure the battery to the computer.

4 Install the:

abase cover

bmicroSD card

5 Follow the procedure in After working inside your computer.

Keyboard

Removing keyboard

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove keyboard:

a Disconnect the keyboard cable from the system board [1].

b Use the plastic scribe to the release the keyboard [2].

NOTE: The two release holes for the keyboard are indicated by the "KB" labeling.

4 Slide and lift the keyboard away from the computer.

Removing and installing components 11

Installing keyboard

1 Align the keyboard trim with the tabs on the computer, and press it until it clicks into place.

2 Connect the keyboard cable on the system board.

3 Install the:

abattery

bbase cover

cmicroSD card

4 Follow the procedure in After working inside your computer.

12 Removing and installing components

Audio board

Removing audio board

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove the audio board:

a Disconnect the audio cable from the connector on the audio board [1].

b Remove the M.2.0x3.0 screw that secures the audio board on the computer [2].

c Lift the audio board away from the computer [3].

Installing audio board

1 Insert the audio board into the slot on the computer.

2 Replace the M2.0x3.0 screw that secure the audio board to the computer.

3 Connect the audio cable to the connector on the audio board.

4 Install the:

abattery

bbase cover

cmicroSD card

5 Follow the procedure in After working inside your computer.

Removing and installing components 13

Power connector port

Removing power connector port

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove the power connector port:

a Disconnect the power connector cable from the connector on the system board [1].

b Remove the M.2.0x3.0 screws that secure the power connector port on the computer [2].

c Slide and lift the power connector port away from the computer [3].

Installing power connector port

1 Insert the power connector port into the slot on the computer.

2 Replace the M2.0x3.0 screw that secures the power connector port to the computer.

3 Connect the power connector cable to the connector on the system board.

4 Install the:

abattery

bbase cover

cmicroSD card

5 Follow the procedure in After working inside your computer.

14 Removing and installing components

Speaker

Removing speaker

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove the speaker:

a Disconnect the speaker cable from the connector on the system board [1].

b Remove the adhesive tape that secures the speaker cable on the computer .

c Unroute the speaker cable from the routing channel [2].

4 Remove the speaker from the computer.

Removing and installing components 15

Installing speakers

1 Place the speakers into the slots on the computer.

2 Route the speaker cable through the retention clips through routing channel.

3 Ax the adhesive tape to secure the speaker cable on the computer.

4 Connect the speaker cable to the connector on the system board.

5 Install the:

abattery

bbase cover

cmicroSD card

6 Follow the procedure in After working inside your computer.

Touchpad panel

Removing touchpad

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

dspeaker

3 To remove touchpad cable:

a Lift the latch, and disconnect the touchpad cable from the computer [1].

b Remove the touchpad cable [2].

16 Removing and installing components

4 To remove metal bracket:

a Remove the screws (M2.0x3.0, M.2.0x2.0) that secure the metal to the touchpad on the computer [1].

b Remove the adhesive tape [2].

c Slide and remove the metal bracket [3].

NOTE: Remove the adhesive tape that secures the speaker cable on the metal bracket.

5 Remove the touchpad from the computer.

Removing and installing components 17

Installing touchpad

1 Place the touchpad into the slots on the computer.

2 Place the metal bracket, and ax the adhesive tape.

3 Replace the screws (M2.0x3.0, M.2.0x2.0) that secure the metal bracket on the computer.

NOTE: Ax the adhesive tape that secures the speaker cable on the metal bracket.

4 Connect the touchpad cable.

5 Ax the adhesive tape to secure the speaker cable on the computer.

6 Connect the speaker cable to the connector on the system board.

7 Install the:

aspeaker

bbattery

cbase cover

dmicroSD card

8 Follow the procedure in After working inside your computer.

System board

Removing system board

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

18 Removing and installing components

3 Disconnect the following cables:

a audio cable [1]

b keyboard cable [2]

c touch pad cable [3]

4 To disconnect the cable:

a Disconnect coin cell battery, power connector port, and speaker cable [1, 2, 3].

b Remove the M2.0xM3.0 screws and lift the metal bracket that secure on the system board [4, 5].

Removing and installing components 19

5 To remove metal bracket:

a Remove the screw M2.0x3.0 and lift the metal bracket that secures the WLAN card on the system board [1, 2]

b Disconnect the WLAN cables [3].

c Remove the screws M2.0x.30 and lift the metal bracket that secures the display cable on the computer [4, 5]

d Lift the latch, and disconnect the cable [6]

6 Remove the M2. x3.0 screws and lift system board away from the computer[1 ,2]

20 Removing and installing components

Installing system board

1 Align the system board with the screw holders on the computer.

2 Tighten the M2.0x3.0 screws to secure the system board to the computer.

3 Connect the display cable to the connector.

4 Place the metal bracket over the connector and tighten the M2.0x3.0 screws to secure the display cable to the computer.

5 Connect the WLAN cables.

6 Place the metal bracket, and tighten the M2.0x3.0 screw to the WLAN cable on the system board.

7 Place the metal and tighten M2.0x3.0 screws to secure on the system board.

8 Connect the following cables:

a power connector cable

b touchpad cable

c keyboard cable

d speaker cable

e power board and audio cable

f sensor cable

9 Install the:

abattery

bbase cover

cmicroSD card

10 Follow the procedure in After working inside your computer.

Display assembly

Removing display assembly

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 To remove display cable:

a Remove the screws M2.0x.30 and lift the metal bracket that secures the display cable on the computer [1, 2].

b Lift the latch, and disconnect the cable [3].

Removing and installing components 21

4 To disconnect WLAN cable:

a Remove the screw M2.0x3.0 and lift the metal bracket that secures the WLAN card on the system board [1, 2].

b Disconnect the WLAN cables [3].

c Turn over the computer [4].

5 To remove the display assembly:

a Remove the display hinge screws M2.0xM5.0 that secure the display assembly to the computer [1].

b Lift the display assembly away from the computer [2].

22 Removing and installing components

Installing display assembly

1 Place the display assembly to align with the screw holders on the computer.

2 Replace the screws that secure the display hinges to the palm-rest assembly.

3 Flip over the computer.

4 Connect the display cable to the connector on the system board.

5 Place the metal bracket over the (display cable) connector, and tighten the M2.0x3.0 screws to secure the display cable to the

computer.

6 Connect the WLAN cables.

7 Place the metal bracket, and tighten the M2.0x3.0 screw to the WLAN cable on the system board.

8 Install the:

abattery

bbase cover

cmicroSD card

9 Follow the procedure in After working inside your computer.

Removing and installing components 23

Display bezel

Removing display bezel

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

3 Remove the hinge cap and the mylar cap that secures the display bezel to the display assembly [1,2].

4 Remove the M2.5x3.5 screws and pry the edges to release the display bezel from the display assembly

Installing display bezel

1 Place the display bezel on the display assembly.

2 Starting from the top corner, press on the display bezel and work around the entire bezel until it clicks on to the display assembly.

3 Replace the M2.0x3.5 screws to secure the display bezel to the display assembly.

4 Ax the hinge cap.

5 Install the:

abattery

bbase cover

cmicroSD card

6 Follow the procedure in After working inside your computer

24 Removing and installing components

Display panel

Removing display panel

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

ddisplay assembly

edisplay bezel

3 Remove the M2.0x3.0 screws that secure the display panel to the display assembly [1] and lift to turn over the display panel to access

the eDP cable [2].

4 To remove display panel:

a Peel o the adhesive tape [1].

b Disconnect the display cable from the connector on the display panel [2].

Removing and installing components 25

Installing display panel

1 Connect the eDP cable to the connector, and ax the tape.

2 Replace the display panel to align with the screw holders on the display assembly.

3 Replace the M2.0x3.0 screws to secure the display panel to the display assembly.

4 Install the:

adisplay bezel

bdisplay assembly

cbattery

dbase cover

emicroSD card

5 Follow the procedure in After working inside your computer

Display hinges

Removing display hinge

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

ddisplay assembly

edisplay bezel

fdisplay panel

3 To remove display hinge:

26 Removing and installing components

a Remove the M2.5x2.5 screws that secure the display hinge to the display assembly [1].

b Lift the display hinge away from the display assembly [2].

Installing display hinge

1 Place the display hinge cover on the display assembly.

2 Replace the M2.5x2.5 screws to secure the display hinge cover to the display assembly.

3 Install the:

adisplay panel

bdisplay bezel

cdisplay assembly

dbattery

ebase cover

fmicroSD card

4 Follow the procedure in After working inside your computer

Camera

Removing camera

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

ddisplay assembly

edisplay bezel

fdisplay panel

3 To remove display camera:

Removing and installing components 27

a Disconnect the camera cable from the connector [1].

b Lift the camera away from the display [2].

Display back cover

Removing display back cover

1 Follow the procedure in Before working inside your computer.

2 Using the plastic scribe pry the edges of the display back cover.

28 Removing and installing components

3 Remove the display back cover away from the computer.

Removing and installing components 29

NOTE: The display back-cover and antenna assembly cannot be further disassembled once all the pre-removal parts

procedures are completed. The picture and table below shows the display back-cover and antenna assembly after

performing the pre-removal parts procedures for any display back-cover and antenna assembly replacement.

a Display cable

b LED Daughter board

c Camera module

d Wireless Antennas (Main+Aux)

e Right Display Hinge

f Left Display Hinge

Installing display back cover

1 Align the display back cover with the tabs on the computer, and press it until it clicks into place.

2 Follow the procedure in After working inside your computer.

Installing camera

1 Place the camera on the display assembly.

2 Connect the camera cable to the connector on the display assembly.

3 Install the:

adisplay panel

bdisplay bezel

cdisplay assembly

dbattery

ebase cover

fmicroSD card

30 Removing and installing components

4 Follow the procedure in After working inside your computer

Palm rest

Replacing palm rest

1 Follow the procedure in Before working inside your computer.

2 Remove the:

amicroSD card

bbase cover

cbattery

dkeyboard

eaudio

fpower connector

gspeaker

htouchpad

idisplay assembly

jsystem board

NOTE: The component you are left with is the palm rest.

3 Install the following components on the new palm rest:

asystem board

bdisplay assembly

ctouchpad

dspeaker

epower connector

faudio

gkeyboard

Removing and installing components 31

hbattery

ibase cover

jmicroSD card

4 Follow the procedure in After working inside your computer.

32 Removing and installing components

Product Specication

This section gives information about product specications.

Table 1. Chrome 11 (3180) Product Specication

Features Chromebook 11 (3180)

Processor Intel Celeron Processor N3060 (6 W, 2 M cache, up to 2.48 GHz)

Operating System Google Chrome OS

Chipset Intel Braswell

Security TPM 1.2 discrete

Dimension Front Height: 20.75 mm

Back Height: 20.75 mm

Width: 303.3 mm

Depth: 206.0 mm

Weight 1265.2 g

Display 11.6 (1366 x 768) eDP 200 nits Anti-Glare

Graphics Intel HD Graphics 500

Memory • LPDDR3 2 GB

• LPDDR3 4 GB

AC Adapter 65 W Dell E4 series AC adapter

Battery 3-cell lithium ion (42 Whr Rechargeable)

Audio Codec Realtek I2S based codec ALC5650

Integrated Microphone Akustica AKU240 digital-output MEMS microphone

Primary Storage 16 GB/32 GB Build-in eMMC storage

Connectivity • Intel Dual Band Wireless-AC 7265 802.11AC

• Bluetooth: 4.0

Multimedia • Stereo Speakers

• Webcam 720p

Ports and Slots • 2x USB 3.1 Gen 1 with BC1.2 Charging

• 1 x HDMI 1.4b (Out)

• Universal Audio Jack

• DC-IN (7.4 mm)

• LEDs

• microSD card reader

• Noble wedge lock slot

Product Specication 33

Features Chromebook 11 (3180)

Internal MiniCard Slots (NGFF)

Warranty • 1 year onsite repair/service

• ProSupport with NBD Onsite

• Premium Phone Support In-Home

• 1-4 years warranty extension options.

Multiple Display Options A connector is available for an external HDMI display up to 1080p

Dock Options N/A

Regulatory and Environmental Compliance Regulatory and product certication for US and EMEA

34 Product Specication

Software

This section provides information about the operating system, commands, and bundled software for Dell Chromebook 11 (3180).

Topics:

• Operating system

• View system information

• Dell activity light

Operating system

This page contains information about the operating system used by the Dell Chromebook 11 (3180).

Chrome OS

Chromebooks are powered by the Google Chrome operating system, based on Google's popular Chrome browser. It has been developed to

provide a fast, simple, and more secure computing experience for users who spend most of their time online.

Key Benets

• Speed

• Simplicity

• Security

• Updatability

Software 35

• Syncronisability

• High power at low cost

• Easy to learn and use

• Documents, calendar, e-mail, contacts, and tasks available online and oine, and all securely backed-up and synchronised in the cloud.

• Access to the Chrome web app store

• Killer web apps

• The latest Intel Core processors

• Fun games

• Built-in support for popular le types and external devices

For more information about the Chrome OS, please visit the Chrome OS training page.

Veried Boot

Read Only rmware veries the integrity of Read/Write (R/W) rmware. R/W rmware veries the active Linux kernel. During run time,

the kernel veries each block read from disk.

If a verication step fails and there is no backup option, the machine enters recovery mode.

36 Software

The Developer Mode switch turns o veried boot (at the Kernel stage) to enable users to run Chromium OS (or other OS). The BIOS is

always veried.

Disk Partition Map

There are two copies of Chrome OS on disk: an active copy and a backup copy. Each copy consists of a kernel partition and a root le

system. The backup copy is updated automatically in the background. Users only need to reboot. The partition contains encrypted user

data and is also used in the factory for storing test software.

Software 37

Developer and Recovery mode

Table 2. Developer and Recovery mode

Developer Mode Recovery Mode

• Used to boot without verication.

• Can be turned on via key combination during boot.

• Stateful partition is wiped during transitions.

• Used in the factory to boot test image.

• Allows a user to reinstall the Chrome OS from a USB key or SD

card.

• Recovery mode is entered if veried boot fails.

• A user can force recovery mode via a key combination during

boot.

Coreboot + U-boot Custom Firmware

Coreboot (x86 only)

• Memory and chipset initialization

• Open-source, except for MRC binary from Intel.

U-Boot

• Performs veried boot

• Handles recovery and Developer Mode

• Open source code

Normal boot is very fast, as it takes less than 1 second to start loading kernel. Chromebook does not boot other operating systems such as

Windows or OS X.

38 Software

Chrome vs Chromium OS

Table 3. Dierence between Chromium and Chrome OS

Dierence between Chromium and Chrome OS

Chromium OS Chrome OS

• Is an open source project: http://www.chromium.org/

chromium-os

• Runs on regular PCs and Chrome devices

• Is based on Chromium OS

• Only runs on the Chrome devices with required hardware

features (TPM, RO rmware, recovery button, developer

switch).

• Includes additional licensed features such as the Netix plugin,

video codecs, and fonts

View system information

This page contains all the information about viewing system information for the Dell Chromebook.

Dell Chromebook 11 (3180) does not support Dell BIOS. Hence, there are several ways to check system specications depending on the

information you are searching for. The table below lists some of the most commonly used methods to view system information and

specications.

Software 39

Table 4. View system information

Commands Action and Purpose Screenshot

Chrome:help View basic OS information.

Chrome:settings View information such as

screen resolution options

(Device>Display settings),

touchpad, and other basic

hardware information.

40 Software

Commands Action and Purpose Screenshot

Chrome:system View advanced system

information such as the Google

Chrome version, BIOS

information, CPU information,

memory information, network

status, power supply

information, etc.

Software 41

Commands Action and Purpose Screenshot

Chrome:net-

internals

View advanced networking

information.

Dell activity light

This page contains all the information about the Dell Bright Light software that is used to control Dell Activity Light.

Overview

Dell Activity Light can be used as an indicator for the interaction between school teacher and student, and Dell has designed a software

over this feature. The application will not be factory installed when product RTS, but it can be downloaded and installed via the web-store

through the following link: https://chrome.google.com/webstore/detail/dell-led/klhphccnhmdlnljpdljjhehlmplnmini

42 Software

Raise your Hand/Answer Question/Discussion buttons

Students can either click the on-screen button or press keyboard hot key to on/o the Ask question LED. The on-screen button can be the

Chrome application in the menu or the shortcut icon on the task bar.

Software 43

MultiColor Poll

Students can vote with dierent LED color by either clicking the on-screen button (suggested) or pressing keyboard hot key.

44 Software

Technology and components

This chapter details the technology and components available in the systems.

Topics:

• Keyboard

• Touchpad

• Integrated microphone

• Bluetooth

Keyboard

Dell Chromebook 11 (3180) keyboards have a few extra features to help you browse the web eortlessly and eciently. The keyboard

contains a dedicated search key and a new row of web shortcut keys. A standard USB Windows keyboard can also be used with the

Chromebook, using the same keyboard shortcuts. The image below shows the keyboard layout.

Keyboard keys function

The Chrome device keyboard is designed to help you get to the things you need the most. The table below is an overview of the special

keys on the top row of the keyboard:

Table 5. Special keys

Special keys

Go to the previous page in browser history

Go to the next page in browser history

Reload current page

Technology and components 45

Special keys

Enter Immersive mode, which hides the tabs and launcher

Enter Overview mode, which shows all windows

Decrease screen brightness

Increase screen brightness

Mute

Decrease the volume

Increase the volume

Search applications and the web at the same time. On a Chromebook, this key is on the side, where the Caps Lock key

is normally located.

Keyboard shortcut keys

Table 6. Shortcut keys

Shortcut keys

Function Combination keys

Page up Press Alt and the up arrow

Page down Press Alt and the down arrow

Home Press Ctrl+Alt, and the up arrow

End Press, Ctrl+Alt and the down arrow

Delete Press Alt+Backspace

Toggle the bookmark bar Ctrl+Shift+B

Search current webpage Ctrl+F

Open a new tab Ctrl+T

Open a new window Ctrl+N

Open the link you clicked in a new background tab Press Alt and click a link

Switch to next tab Ctrl+Tab

Switch to next window Switch to next window

Sign out of Google Account Ctrl+Shift+Q

Close current tab Ctrl+W

46 Technology and components

To see more shortcuts, simply press Ctrl+Alt+? To open the keyboard viewer on your screen.

Touchpad

This page contains information for Dell Chromebook 11 (3180) touchpad gestures.

The following table lists some gestures and actions supported by the Chromebook touchpad:

Table 7. Touch pad gestures

Touchpad gestures

Gestures Explanation

Simply move your nger across the touchpad.

Press down on the lower half of the touchpad. Since tap-to-click is enabled by default, you can quickly tap the

touchpad to click.

Click the touchpad with two ngers.

Place two ngers on the touchpad and move them up and down to scroll vertically, left and right to scroll

horizontally. If you have Australian scrolling enabled, move two ngers up to scroll down. (It works in the same

way as say, your smartphone or tablet.) If you have multiple browser tabs open, you can also swipe left and

right with three ngers to quickly move between tabs.

Swipe Quickly move two ngers left or right to go backward or forward on web pages or while using apps.

Click the item you want to move with one nger. With a second nger, move the item. Release both ngers to

drop the item at its new location.

Technology and components 47

Integrated microphone

This page contains all the information about the Dell integrated microphone.

Akustica AKU240 is an HD Voice quality, top port, digital output MEMS microphone in a small 4.0 x 3.0 x 1.0 mm package. The robust digital

output stream from the AKU240 is virtually immune to all forms of Radio Frequency Interference (RFI) and Electromagnetic Interference

(EMI) allowing the microphone to be integrated anywhere on the platform regardless of proximity to displays, the Wi-Fi antennae, or other

sources of interference that would degrade the signal of conventional analog microphones. For the device manufacturer, this translates to a

higher degree of design exibility by providing a consistent SNR level regardless of environment, resulting in shorter design cycles.

The output of the microphone is pulse density modulated (PDM), a single-bit digital output stream designed to enable the multiplexing of

stereo microphone data onto a single wire. With a user selectable Left/Right channel option, the AKU240 is ideal for use in multiple

microphone applications.

Key features

• Digital MEMS Microphone with PDM (pulse density modulation) output

• Excellent acoustic performance with 63 dB SNR

• Compatible with Microsoft Windows 8 and Intel Ultrabook Requirements for Digital Microphones

• Tightly controlled sensitivity of -26 dBFS +/- 2 dB

• Robust digital-output immune to RF/EM interference

• Matched microphones in frequency and phase response for array applications

• Output supports dual-microphone, single-wire multiplexing •Industry standard microphone interface compatible with multiple codecs.

• Low current power-down mode

• Lead-free surface-mountable and RoHS2 compliant

• Halogen-free in accordance with IEC61249-2-21

• Thin prole, SMT packaging

• Industry-standard package of 4.00 x 3.00 x 1.00 mm

Typical applications

• Ultrabooks

• Mobile phones

• Media tablets

• eReaders

• Microphone arrays

• Webcams and camera modules

Bluetooth

This section outlines the instruction to pair a bluetooth device with your Chrome devices.

Bluetooth technology lets you connect devices wirelessly over short distances. To use the Bluetooth accessories with your Chromebook,

rst check if your Chromebook supports Bluetooth. You will then need to pair it with the accessory.

To see if you can use the Bluetooth accessories with your Chromebook, click the status area in the lower right corner, where your account

picture appears. If you see the Bluetooth icon or in the menu, your Chromebook supports Bluetooth. If you do not see either of

48 Technology and components

these icons, your Chromebook does not support Bluetooth. If your Chromebook supports Bluetooth, it can connect to a wide range of the

Bluetooth accessories, including the following:

• Keyboards

• Mice

• Speakers

• Headphones

• Headsets (audio only)

To connect a Bluetooth device with your Chromebook, you need to pair them. Here is how:

1 Sign in to your Chromebook.

2 Click the status area in the lower-right corner, where your account picture appears.

3 Select your Bluetooth status in the menu that appears.

4 If Bluetooth is disconnected, click the disconnected icon. or click Enable Bluetooth in the menu. Your Chromebook will

automatically begin scanning for available Bluetooth devices.

5 Pick the device you want to add from the list of available Bluetooth devices and click Connect.

6 Follow the instructions on the screen to connect your Bluetooth device.

• If you are connecting a mouse, no PIN is normally required. If you are prompted for a PIN, enter the PIN for your mouse using your

Chrome device's keyboard.

• If you are connecting a keyboard, enter the randomly generated PIN on the keyboard you wish to pair and press Enter.

To conrm that your Bluetooth device is connected, check the Bluetooth status. You should see your device listed there.

NOTE: Just got your Chromebook or Chromebox? If you are turning on your chrome device for the rst time and you have a

Bluetooth device nearby that is also turned on, your chrome device may automatically detect the device and show you steps to

pair it. You will see these instructions only if your chrome device does not already have a similar device connected or its

functionality is not built in, like a keyboard or trackpad.

Technology and components 49

Diagnostic and troubleshooting

This section covers the diagnostics tool and troubleshooting information for eld service technicians.

Topics:

• Basic troubleshooting

• CROSH

• CROSH commands

• Chrome commands

• Commonly used CROSH command

• Reset Chromebook

• Recovery Chromebook

Basic troubleshooting

This page contains all the information for Dell basic troubleshooting

NOTE: Refer to Google Help Center for the online troubleshooter.

NOTE: Resetting the Chromebook, also known as Powerwash, can be attempted before Recovering the Chromebook.

Recovering the Chromebook is the last resort.

Power issues

Table 8. Power issue

Power issues

Issue Possible solutions

Chromebook would not Power On

If the Chromebook will not turn on, follow these steps:

1 Remove all external devices.

a If the Chromebook starts, reconnect devices one at a

time while restarting the computer to gure out which

device is causing the problem. You are done.

b If the Chromebook still does not start or exhibits the

same problem, do not reconnect anything, and continue

troubleshooting.

2 The battery life might be too low. Plug the Chromebook into

the AC adapter and let it charge for at least an hour and try

turning it on again.

NOTE: When a new Chromebook is used for the

rst time, the battery is still in shipping mode.

To resolve this issue, turn o the Chromebook

and plug in the AC adapter and turn on the

Chromebook again.

3 Depending on the Chromebook you have, you may see a

power indicator light close to the charging port. If you have let

50 Diagnostic and troubleshooting

Power issues

the Chromebook charge and the light is not coming on,

perform a hard reset.

NOTE: You can perform a hard reset by pressing

Refresh + Power.

4 Use a dierent AC adapter with the same power voltage.

5 Remove the AC adapter, and turn on with the battery power

only.

Display issue

Table 9. Display issue

Display issue

Issue Possible solutions

Screen is Blank

If the Chromebook's screen is blank, try the following

troubleshooting steps to resolve the issue, checking to see if the

screen turns on after each step:

1 Make sure the Chromebook is on. If you are using the battery,

plug the Chromebook in and press the power button.

2 Restart the Chromebook by holding the power button down

until the device turns o, then turn it back on again.

3 Reset or Recover the Chromebook.

Audio, screen, and camera issues

Table 10. Audio, screen, and camera issues

Audio, screen, and camera issues

Issues Possible solutions

Audio issues

If you hear static, or the volume from the speakers is low when

attempting to listen to audio:

1 Make sure the device is not muted. Try adjusting the volume.

2 Try rebooting the Chromebook.

3 Try playing audio from various sources, including YouTube and

audio les stored locally on the Chromebook.

If the speakers are not responding when attempting to listen to

audio:

1 Unplug the device from all cables (USB, headphones, and

displays).

2 Try playing audio from various sources, including YouTube and

audio les stored locally on the Chromebook.

3 Try rebooting the Chromebook.

4 If audio still does not respond, try to Reset or Recover the

Chomebook.

Screen issues If the screen is not operating properly (images are too dark or no

image is appearing):

Diagnostic and troubleshooting 51

Audio, screen, and camera issues

1 Try adjusting the brightness with the brightness keys at the

top of the keyboard.

2 In the status area in the bottom-right of the screen, check the

display and make sure there are no issues with a mirrored or

extended display.

3 Try rebooting the Chromebook

4 If the screen issues persist, try to Reset or Recover the

Chomebook.

Camera issues

If the camera is not operating properly (blurry images or poor

performance):

1 Check that the camera is not being blocked or covered by a

privacy screen or other obstruction.

2 Try using dierent apps that use the camera. Try a Google+

Hangout or the onboard camera app

3 Try rebooting the Chromebook

4 If the camera issues persist, try to Reset or Recover the

Chomebook.

Bluetooth issue

Table 11. Bluetooth issue

Bluetooth issue

Issue Possible solutions

Bluetooth issues

If you run into issues while attempting to pair or use a Bluetooth

device with the Chromebook, try the following steps to resolve the

issue:

1 First, make sure that the Bluetooth device you are trying to

pair is supported by the Chromebook.

2 Try disabling and re-enabling Bluetooth connectivity from the

status area in the lower-right corner.

3 Try restarting the Chromebook.

4 If you are still encountering issue with bluetooth, try to Reset

or Recover the Chomebook.

Touchpad / Hotkeys issues

Table 12. Touchpad / hotkeys issues

Touchpad / Hotkeys issues

Issue Possible solutions

Touchpad not responding

If the touch pad has stopped responding, try the following steps to

resolve the issue: Try moving the cursor after each step:

1 Tap the Esc key several times.

2 Drumroll the ngers across the touch pad for a few seconds.

3 Restart the Chrome OS by holding down the power button

until the device turns o, and then turn it back on again.

52 Diagnostic and troubleshooting

Touchpad / Hotkeys issues

4 If the cursor still does not move when using the touch pad, try

logging in from the Guest account using the tab key to

navigate.

5 If users experience touch pad issues with the account that is

not the owner (primary) account, delete the user account and

re-create it. Again, use the tab key to navigate.

6 If none of the above steps work, try to Reset or Recover the

Chomebook.

Top row of keys (Hotkeys) not responding

If a hotkey (like the volume or brightness keys) are not responding,

try the following troubleshooting steps, making sure to test the keys

after each one:

1 If the aected key is volume or brightness, check to make sure

you are not at the upper or lower limit for that setting.

2 If the backward or forward buttons do not work, check that

the same icons in a web browser are not grayed out. For

example, if the back button on a web page is grayed, this is

because the browser is not aware of a page to move

backward to.

3 Restart the Chrome OS by holding down the power button

until the device turns o, and then turn it back on again.

4 Try using the keys in the Guest account.

5 If users experience hotkey issues with the account that is not

the owner (primary) account, delete the user account and re-

create it.

6 If none of the above steps work, try to Reset or Recover the

Chomebook.

Chrome OS issue

Table 13. Chrome OS issue

Chrome OS issues

He’s Dead, Jim! error message

If the Chromebook becomes slow or unresponsive, and the He's

Dead, Jim! error message appears, the system could be running

low on memory.

NOTE: If you terminated the process using Google

Chrome's Task Manager, the system's task manager, or

with a command line tool, this message will appear as well.

1 If the page was not ended intentionally, reload the page to

continue. If the message continues to appear, try closing

inactive tabs or other programs to free up more memory.

2 If issue persists, please see He's Dead, Jim! from Google

knowledge base.

Chrome OS is missing or damaged

If the Chromebook does not start and displays the message,

Chrome OS is missing or damaged. Please insert a recovery USB

stick into the USB ports on the device:

Perform a system recovery. See performing Recover Chromebook

for more information.

Chrome OS stops responding and nothing moves on the computer

display

If the Chrome OS stops responding and nothing moves on the

computer display:

1 Turn o the computer.

Diagnostic and troubleshooting 53

Chrome OS issues

2 Disconnect all peripheral devices, and remove all USB devices

and media cards.

3 Disconnect the AC adapter.

4 Press and hold the power button for 10 seconds.

5 Reconnect the AC adapter, and turn on the system.

6 If issue persists, please perform a Reset or Recover the

Chromebook.

Lost / Forget Sign in password (Chrome OS)

If you lost/forget the sign-in password to the Chromebook:

1 Check if this is a managed device (Enterprise enrolled device).

a If this is a managed device, please contact the

administrator to have them reset the password via

Google Admin Console.

b If this is not a managed device, please proceed with the

following steps:

2 Sign in as guest or use a dierent PC.

3 Open an internet browser, and navigate to https://

www.google.com/accounts/recovery/

4 Select I do not know my password, and then enter the email

address that you use to sign in to Google.

5 Click Continue and follow the on-screen instructions to reset

the password.

Other Chromebook lock up or freeze symptoms that are not listed

here

If none of the above symptoms match the Chromebook’s issue,

refer to Google Help Center for the online troubleshooter and more

help.

CROSH

This topic covers the information you need to know for the Chrome Shell (CROSH). CROSH and the Google Chrome URL commands

provide some troubleshooting tools, information, and advanced settings.

The Chrome OS does not support ePSA, Dell BIOS, the F12 boot menu, or DellConnect. There are no preboot diagnostics. All

troubleshooting must be done inside the OS. Chrome Shell (CROSH) and the Chrome URL commands provide some troubleshooting tools,

information, and advanced settings. CROSH is a command line interface similar to the Linux BASH or Windows command (cmd.exe)

terminals. Chrome OS is based on Linux, but CROSH does not recognize most Linux commands. The most useful commands for

troubleshooting are memory test, storage_test_1, storage_test_2, ping, and tracepath. Ping works dierently than it does in Windows. By

default, it repeats until you press <Ctrl> + <C>, and it does not show any statistics. The tracepath command is similar to the Windows

traceroute command. A detailed explanation of the commands can be viewed below, by typing help, or help_advanced in CROSH.

1 Open the Chrome browser.

54 Diagnostic and troubleshooting

2 Press <Clrl> + <Alt> + <T> The interface appears as shown in the screenshot below:

3 Type in the CROSH command for diagnostics. Type 'help' for a list of available commands. Type help_advanced to display a complete

list of commands for debugging purposes

Alternately, refer to CROSH Commands for the list of the CROSH commands available for diagnostics.

CROSH commands

The table below lists the available commands in Chrome Shell (CROSH).

Table 14. Help commands

Command Purpose

exit Exits the CROSH Shell.

help Displays this help.

help_advanced Displays the help for more advanced commands, used for

debugging.

ping [-c count] [-i interval] [-n] [-s packetsize] [-W waittime] — Sends

ICMP ECHO_REQUEST packets to a network host. If is "gw", then

the next hop gateway for the default route is used. It works just like

the ping command on other operating systems. Press <Clrt> + <C>

to stop the ping process or halt any other command in CROSH.

ssh [optional args...] — Starts the ssh subsystem if invoked without any

arguments. "ssh <user> <host>", "ssh <user> <host> <port>", "ssh<

user>@<host>". or "ssh <user>@<host> <port>" connect without

entering the subsystem

ssh_forget_host Removes a host from the list of known ssh hosts. This command

displays a menu of known hosts and prompts for the host to forget.

top Sets the chaps debug logging level. No arguments start verbose

logging

Diagnostic and troubleshooting 55

Table 15. Advanced help command

Command Purpose

battery_test[<test length>] Tests the battery discharge rate for a given number of seconds. No

argument defaults to a 300 s test.

bt_console [<agent capability>] Enters a Bluetooth debugging console. The Optional argument

species the capability of a pairing agent the console provides; see

the Bluetooth Core specication for valid options.

chaps_debug [start|stop|<log_level>] Sets the chaps debug logging level. No arguments will start verbose

logging.

connectivity Shows connectivity status.

experimental_storage<status|enable|disable> Enables or disables experimental storage features.

_debug [<tag_expr>] [--help] [--list_valid_tags] [--reset] Adds and removes imam debugging tags.

memory_test Performs extensive memory testing on the available free memory.

modem <command> [args...] Interacts with the 3G modem. Run modem help for detailed help.

modem_set_carrier carrier-name Congures the modem for the specied carrier.

network_diag[--date] [--link] [--show-macs] [--wi] [--help] [--wi-

mon] <host>

Performs a suite of network diagnostics and saves a copy of the

output to your download directory

network_logging <wi|cellular|ethernet> Enables a predened set of tags useful for debugging the specied

device.

p2p_update [enable | disable] Enables or disables the peer-to-peer (P2P) sharing of updates over

the local network. This will both attempt to get updates from other

peers in the network and shares the downloaded updates with

them. Run this command without arguments to see the current

state.

rlz < status | enable | disable> Enables or disables RLZ.

rollback Attempts to roll back to the previous update cached on your

system. Only available on non-stable channels and non-enterprise

enrolled devices. Please note that this will power wash your device.

route [-n] [-6] Displays the routing tables.

set_apn [-n <network-id>] [-u <username>] [-p <password>] <apn> Sets the APN to use when connecting to the network specied by

<network-id>. If <network-id> is not specied, use the network-id

of the currently registered network.

set_apn - c Clears the APN to be used, so that the default APN is used instead.

set_arpgw <true | false> Turns on the extra network state checking to make sure the default

gateway is reachable.

set_cellular_ppp [-u <username>] [-p <password>] Sets the PPP username and/or password for an existing cellular

connection. If neither -u nor -p is provided, this shows the existing

PPP username for the cellular connection.

set_cellular_ppp -c Clears any existing PPP username and PPP password for an

existing cellular connection.

sound <command> <argument> Low level sound conguration. Can be used to play/record audio

samples and enable beam forming on Pixel. sound beamforming

<on|o > will enable/disable the feature. sound record [duration]

will start recording. sound play <lename> plays the recorded audio

samples

storage_status Reads storage device SMART health status, vendor attributes, and

error logs.

storage_test_1 Performs a short oine SMART test.

56 Diagnostic and troubleshooting

Command Purpose

storage_test_2 Performs an extensive readability test.

syslog <message> Logs a message to system log.

tpcontrol{status | taptoclick [on|o] sensitivity [1-5] | set

<property>< value>} tpcontrol {syntp [on|o]}

Allows the user to manually adjust advanced touchpad settings.

tracepath [-n] <destination>[/port] Traces the path/route to a network host.

update_over_cellular [enable|disable] Enables or disables the auto updates over cellular networks. Run

without arguments to see the current state.

upload crashes Uploads available crash reports to the crash server.

wpa_debug [<debug_level>] [--help] [--list_valid_level] [--reset] Sets the wpa_supplicant debugging level.

xset m [acc_mult[/acc_div] [thr]] xset m default Tweaks the mouse acceleration rate.

xset r rate [delay [rate]] Tweaks the autorepeat rates. The delay is the number of

milliseconds before autorepeat starts. The rate is the number of

repeats per second.

xset r [keycode] < on|o > Turns autorepeat on/o. If a keycode is specied, it aects only

that key. If not specied, it aects global behavior.

Chrome commands

Chrome:// pages contain experimental features, diagnostic tools, and detailed statistics. They are hidden in Chrome's user interface.

Chrome://about page lists all Chrome's internal pages. To view all the commands, type chrome://about in the Chrome browser URL as

shown below:

Table 16. Chrome browser shortcuts

Purpose Browser Shortcut Explanation

System Information chrome://system/ "Who am I".. BIOS version, and so on

Basic Connectivity Diags chrome://diagnostics/ Test for NIC and Internet connection

Chrome Information chrome://version More "Who am I" type of stu

Create Recovery USB Stick chrome://imageburner/ Google's version of DBAR/DBRM

Chrome Flags chrome://ags Experimental features beyond the scope of

what Dell supports

Diagnostic and troubleshooting 57

Purpose Browser Shortcut Explanation

Memory Troubleshooting chrome://memory View running processes and memory

utilization

Module Load chrome://conicts Shows conicts of all modules loaded by

Chrome

Chrome Sync Status chrome://syncchrome://sync-internals Allows troubleshooting of connected

accounts

Connectivity Troubleshooting chrome://net-internals Comprehensive network/connectivity

diagnostics, including DNS analysis, Waterfall

and Bandwidth diagnostics, and so on

Histogram chrome://histograms Actual work and I/O audit

Credits chrome://credits References to all module/libs contributions

and their respective wiki/license URLs

Crash Reporting chrome://crashes Shows detailed crash report, if the feature

was enabled

Apps RAM Utilization chrome://appcache-internals Detailed memory usage for apps/extensions,

especially handy for 2 GB Chromebooks

Following are the 12 most helpful chrome:// commands that you should know:

58 Diagnostic and troubleshooting

Table 17. Helpful chrome commands

Chrome Commands Purpose Screenshot

chrome://ags From here you can enable some of the

experimental features that are hidden in the

Google Chrome browser. Please note that as

mentioned on this page, since these are

experimental, these might not work as

expected and might cause issues. Enable

these features, and use it at your own risk.

chrome://dns This displays the list of hostnames for which

the browser will prefetch the DNS records.

Diagnostic and troubleshooting 59

Chrome Commands Purpose Screenshot

chrome://downloads This is also available from the Menu >

Downloads. Shortcut key is Ctrl+J.

chrome://extensions This is also available from the Menu > Tools

> Extensions.

chrome://bookmarks This is also available from the Menu >

Bookmarks > Bookmark Manager. Short cut

key is Ctrl+Shift+O.

60 Diagnostic and troubleshooting

Chrome Commands Purpose Screenshot

chrome://history This is also available from the Menu >

History. Short cut key is Ctrl+H.

chrome://memory This will redirect to “chrome://memory-

redirect/”. This will display the memory used

by the Google Chrome browser. This also

displays all the process related to browser

with their PID, process name, and the

memory it takes.

chrome://net-internals This displays all networking related

information. Use this to capture network

events generated by the browser. You can

also export this data. You can view DNS

host resolver cache. One of the important

features in this feature is “Test”. If a URL

failed to load, you can go to “chrome://net-

internals” > click on “Tests” tab > type that

URL which failed, and click on “Start Test”,

which does some test and report you why

that URL failed. chrome://plugins/.

Diagnostic and troubleshooting 61

Chrome Commands Purpose Screenshot

chrome://quota-internals This gives information about the disk space

quote used by the browser, including the

breakdown of how much space the

individual websites took under temporary

les.

chrome://sessions This displays the number of sessions and

magic list that are currently running.

chrome://settings This is also available from the Menu >

Options (on Windows), and Menu >

Preferences (on Linux). From here you can

control various browser related settings.

62 Diagnostic and troubleshooting

Chrome Commands Purpose Screenshot

chrome://sync-internals This gives information about the Chrome

sync feature, including the Sync URL used

by Google, and sync statistics.

Commonly used CROSH command

This page contains information about the most commonly used CROSH commands to diagnose the Dell Chromebook 11 (3180).

Below are some of the most commonly used CROSH commands to troubleshoot a hardware issue.

NOTE: CROSH storage_test_1 and storage_test_2 are not supported on the eMMC storage device.

Check battery charging status

The Chrome Shell (CROSH) includes a simple battery health diagnostic test. This is to conrm that the battery is charging and to check on

the battery health and discharge rate. Follow the instruction provided to check on the battery charging status:

1 Connect the AC adapter to the Chromebook and a power outlet.

2 Turn on, and sign in to the Chromebook.

3 Open the Chrome browser.

4 Press CTRL + ALT + T to open CROSH.

Diagnostic and troubleshooting 63

5 Type battery_test 1 into CROSH, and then press Enter.

6 Check the result to conrm that the battery is charging.

Check battery health

Follow the steps to evaluate the health of the Chromebook battery, and check the discharge rate:

1 Disconnect the AC adapter from the Chromebook.

2 Turn on and sign in to Chromebook.

3 Open the Chrome browser.

64 Diagnostic and troubleshooting

4 Press CTRL + ALT + T to open CROSH.

5 Type battery_test 1 into CROSH, and then press Enter.

6 A screen displays the current battery health and discharge rate.

• If the Battery health percentage is greater than 50%, the battery is within the expected wear limits.

• If the Battery health percentage is equal to or less than 50% and the battery is less than a year old, the battery is outside expected

wear limits and might need to be replaced.

Diagnostic and troubleshooting 65

• If the test results show that Battery is Unknown, the battery might need to be replaced.

Checking memory

Follow the steps below to perform a memory check for Chromebook:

NOTE: This will approximately take 20 minutes to complete the test, and it also depends on the capacity of the memory.

1 Turn on and sign in to Chromebook.

2 Open the Chrome browser.

3 Press CTRL + ALT + T to open CROSH.

4 Type memory_test into CROSH, and then press Enter.

66 Diagnostic and troubleshooting

5 A diagnostic screen displays the result of the memory test passed without any errors.

Example of a memory test failure.

Diagnostic and troubleshooting 67

Checking network status

If you are having trouble connecting to the Internet, use the steps in one or more of the following sections to test the network adapter:

Follow the instruction to gather the information about the network and diagnose the network errors.

1 Turn on and sign in to Chromebook.

2 Open the Chrome browser.

3 Press CTRL + ALT + T to open CROSH.

4 Type network_diag into CROSH, and then press Enter.

68 Diagnostic and troubleshooting

5 Wait while CROSH performs a set of network diagnostic tests. A diagnostic screen displays the results of the network adapter health

test.

6 The diagnostic test log is saved as a.txt (plain text) le in the Files app.

Diagnostic and troubleshooting 69

7 If the diagnostic test returns a failure message, make sure the Wi-Fi adapter is enabled and connect to a network.

Reset Chromebook

This page contains all information about resetting Dell Chromebook 11 (3180).

All local user data stored on the Chromebook can be cleared by resetting it to its original factory state (also known as Powerwash).

This step might be helpful if you want to reset owner permissions or if you are experiencing issues with your user prole.

NOTE: All data stored on your Chromebook such as downloaded les, photos, owner permissions, and saved networks, will be

deleted for all accounts when performing a factory reset. After clearing this data, you will be guided through the initial setup

again. Resetting your device will not aect your accounts themselves, or any data synced to these accounts.

NOTE: Do not follow the instructions below if you're using a managed Chrome device, as you will not be able to re-enroll your

device after powerwashing it.

Follow these steps to reset your Chromebook to its original factory state:

70 Diagnostic and troubleshooting

1 Click the status area in the lower-right corner, where your account picture appears.

Diagnostic and troubleshooting 71

2 Click Settings as highlighted from the screenshot below.

72 Diagnostic and troubleshooting

3 Click Show advanced settings to expand the menu.

Diagnostic and troubleshooting 73

4 Click the Powerwash button.

74 Diagnostic and troubleshooting

5 Click Restart when prompted.

You can also reset your Chromebook from the sign-in screen by holding down the keys Ctrl+Alt+Shift+R and clicking Restart. (If you

are signed in to your Chromebook, sign out rst before you press on Ctrl+Alt+Shift+R, then click Restart. Once the Chromebook is

restarted, click Reset.)

After you restart the Chromebook, you should now see the setup screen. Follow the instructions on the screen to set up your Chromebook

again. Make sure you sign in with your primary Google Account, because this account is set as the owner account.

Recovery Chromebook

This page contains information about recovering Dell Chromebook 11 (3180).

Recovering the Chromebook

Install a new version of the Chrome operating system on your Chromebook by going through the recovery process. You may want to go

through this process if you are having problems updating your Chromebook or if it stops working.

Diagnostic and troubleshooting 75

NOTE: All account information and data stored on your Chromebook, such as photos, downloaded les, and saved networks, will

be deleted. Owner privileges for your primary account will also be reset. However, the actual Google Accounts and any data

synced to these accounts are not aected by the recovery process. After the recovery process is complete, you will be guided

through the initial setup again.

Prerequisites:

Before starting this process, you need the following:

• A Chrome device, Windows, Mac, or the Linux computer with administrative rights.

• A 4 GB or larger USB ash drive or SD card that you do not mind clearing.

Step 1: Check for the "Chrome OS is missing or damaged" message

If you see this message, you can rst try to perform a hard reset on your Chromebook by pressing Refresh + Power. If you still see this

message after performing a hard reset, please proceed to Step 2.

If you see the Chrome OS verication is turned o message, refer to Chrome OS verication is turned o section below.

Step 2: Create the recovery USB ash drive or SD card

Insert a USB ash drive or SD card into your computer and follow the instructions below:

Table 18. USB ash drive or SD card

Operating System Instructions

Chrome Device Instructions

Create a recovery ash drive by using the Image Burner. The tool

may not be available in all languages.

1 Type chrome://imageburner into the omnibox (browser's

address bar) .

2 Run the tool and follow the instructions that appear on your

screen.

NOTE: When recovering your Chromebook, make sure to

create the recovery ash drive on the same model.

Windows Instructions

1 Click this link to download the Recovery Tool. If you are a

network administrator for your school, business, or

organization, click this link to download the Recovery Tool: 2.

2 Run the tool and follow the instructions that appear on your

screen.

3 After you recover your Chromebook, you must format your

USB ash drive or SD card using the Recovery Tool. If you do

not format your USB ash drive or SD card, you will not be

able to use all the storage space on your external device.

Additionally, your USB ash drive or SD card may not be

recognizable by Windows.

Mac Instructions

Create a recovery ash drive by using the Recovery Tool. The tool

may not be available in all languages.

1 Click this link to download the Recovery Tool.

2 Run the tool and follow the instructions that appear on your

screen.

After the process is complete, you might see an alert saying your

USB drive or SD card is unreadable. If this fails, try removing and

76 Diagnostic and troubleshooting

Operating System Instructions

reinserting your USB drive or SD card. Your USB drive or SD card

should now be ready to use for recovery.

Linux Instructions

Create a recovery ash drive by using the Recovery Tool. The tool

may not be available in all languages.

1 1.Click this link to download the Recovery Tool.

2 Modify the script permissions to allow execution with the

following command: $ & sudo chmod 755 linux_recovery.sh

3 Run the script with root privileges with the following

command:$ sudo bash linux_recovery.sh

4 Follow the prompts from the tool to complete building the

operating system image.

Reinstall the Chrome Operating System

1 Start your Chromebook.

2 When the Chrome OS is missing or damaged screen appears, insert the USB ash drive or SD card you created into the USB port or

SD card slot on your Chrome device

3 Wait for the Chromebook to boot up from the ash drive

4 Follow the instructions that appear on the screen.

5 On successful installation of the Chrome operating system, you will be prompted to remove the USB ash drive or SD card.

6 Remove the USB ash drive or SD card when prompted, and your Chromebook will automatically restart.

You should now be able to start your Chromebook as normal. Because the data stored on your Chromebook has been cleared, you will need

to go through the initial setup again. Make sure you sign in with your primary Google Account, because this account will be set as the

owner account.

"Chrome OS verication is turned o" Message

By default, Chromebooks are set to the normal user mode. If you've set the user mode to developer mode instead, you'll see a screen with

the message "Chrome OS verication is turned o" when you start up. Use the developer mode if you want to test your own version of the

Chrome operating system.

Press Ctrl+D to enter developer mode. If you press the space bar instead, you'll see a screen asking to recover your device.

Troubleshooting Tips

Table 19. Troubleshooting tips

Question Solution

I am unable to recover my Chromebook To help ensure that you are running the latest version of Chrome

OS once you recover your Chromebook, we recommend creating

the recovery media with the latest version of Chrome OS and avoid

using recovery media that may contain an older version of the

operating system.

An error message An unexpected error has occurred. Try the following steps:

1Conrm that you successfully completed all instructions

exactly as specied in Step 2: Create the recovery USB ash

drive or SD card above.

2 Try using a dierent USB stick or SD card.

Diagnostic and troubleshooting 77

Question Solution

3 If the problem persists, contact Google Chrome support team.

An error message You are using an out-of-date Chrome OS

recovery image.

You should download an up-to date recovery image. Simply follow all

the instructions exactly as specied in Step 2 above.

You successfully recovered your Chromebook but now you can not

use your USB or SD card with Windows

After you have completed recovery, you need to format your USB

or SD card using the recovery tool.

You successfully recovered your Chromebook but now Windows

does not recognize the whole size of the USB or SD card used for

recover.

After you have completed recovery, you need to format your USB

or SD card using the recovery tool.

78 Diagnostic and troubleshooting

Contacting Dell

NOTE: If you do not have an active Internet connection, you can nd contact information on your purchase invoice, packing slip,

bill, or Dell product catalog.

Dell provides several online and telephone-based support and service options. Availability varies by country and product, and some services

may not be available in your area. To contact Dell for sales, technical support, or customer service issues:

1 Go to Dell.com/support.

2 Select your support category.

3 Verify your country or region in the Choose a Country/Region drop-down list at the bottom of the page.

4 Select the appropriate service or support link based on your need.

Contacting Dell 79

Table of Contents

DELL 3180 User Manual

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