LENOVO THINKCENTRE E73 (01) PDF MANUAL


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PDF Content Summary: ThinkCentre E73 User Guide Machine Types: 10AU, 10AW, 10BF, 10BG, 10DU, and 10DT Note: Before using this information and the product it supports, be sure to read and understand the “Important safety information” on page v and Appendix A “Notices” on page 127. Fifth Edition (July 2015) © Copyright Lenovo 2013, 2015. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925.

Contents Important safety information . . . . . . v Service and upgrades . . . . . . . . . . . . . v Static electricity prevention. . . . . . . . . . . v Power cords and power adapters . . . . . . . . vi Extension cords and related devices . . . . . . . vi Plugs and outlets. . . . . . . . . . . . . . vii External devices . . . . . . . . . . . . . . vii Heat and product ventilation . . . . . . . . . vii Operating environment . . . . . . . . . . . viii Laser compliance statement . . . . . . . . . viii Power supply statement . . . . . . . . . . . . ix Cleaning and maintenance . . . . . . . . . . . ix Chapter 1. Product overview . . . . . . 1 Features . . . . . . . . . . . . . . . . . . 1 Specifications . . . . . . . . . . . . . . . . 5 Lenovo programs . . . . . . . . . . . . . . 5 Accessing a program on your computer . . . . 5 An introduction to Lenovo programs . . . . . 6 Locations. . . . . . . . . . . . . . . . . . 8 Locating connectors, controls, and indicators on the front of your computer . . . . . . . . 9 Locating connectors on the rear of your computer . . . . . . . . . . . . . . . 10 Locating components . . . . . . . . . . 12 Locating parts on the system board . . . . 13 Locating internal drives . . . . . . . . . 14 Machine type and model label. . . . . . . 15 Chapter 2. Using your computer . . . 17 Frequently asked questions . . . . . . . . . 17 Navigating among screens on the Windows 8 and Windows 8.1 operating systems . . . . . . . . 17 Navigating on Windows 8 . . . . . . . . 17 Navigating on Windows 8.1 . . . . . . . . 19 Accessing Control Panel on the Windows 8 or Windows 8.1 operating system . . . . . . . . 20 Using Windows shortcut keys. . . . . . . . . 20 Using the wheel mouse . . . . . . . . . . . 21 Setting the computer volume . . . . . . . . . 21 Adding an icon to the Windows notification area . 21 Using CDs and DVDs . . . . . . . . . . . . 22 Handling and storing CD and DVD media . . 22 Playing a CD or DVD . . . . . . . . . . 23 Recording a CD or DVD . . . . . . . . . 23 Chapter 3. You and your computer . . 25 Accessibility and comfort . . . . . . . . . . 25 Arranging your workspace . . . . . . . . 25 Comfort . . . . . . . . . . . . . . . 25 Glare and lighting . . . . . . . . . . . . 26 Air circulation . . . . . . . . . . . . . 26 Electrical outlets and cable lengths . . . . . 26 Accessibility information . . . . . . . . . 26 Registering your computer . . . . . . . . . . 29 Moving your computer to another country or region . . . . . . . . . . . . . . . . . . 29 Chapter 4. Security . . . . . . . . . . 31 Security features . . . . . . . . . . . . . . 31 Locking the computer cover . . . . . . . . . 32 Attaching a Kensington-style cable lock. . . . . 33 Preventing unauthorized access to your computer. . . . . . . . . . . . . . . . . 33 Using fingerprint authentication . . . . . . . . 34 Using and understanding firewalls . . . . . . . 34 Protecting data against viruses . . . . . . . . 34 Chapter 5. Installing or replacing hardware . . . . . . . . . . . . . . . 35 Handling static-sensitive devices . . . . . . . 35 Installing or replacing hardware . . . . . . . . 35 Installing external options . . . . . . . . 35 Removing the computer cover. . . . . . . 35 Removing and reinstalling the front bezel . . 36 Accessing the system board components and drives . . . . . . . . . . . . . . . . 37 Installing or replacing a PCI Express card . . 39 Installing or replacing a memory module. . . 41 Replacing the battery . . . . . . . . . . 42 Replacing the hard disk drive . . . . . . . 43 Replacing the optical drive . . . . . . . . 45 Replacing the solid-state drive . . . . . . 49 Replacing the power supply assembly . . . 54 Replacing the heat sink and fan assembly . . 58 Replacing the microprocessor. . . . . . . 61 Replacing the system fan assembly . . . . 64 Replacing the front audio and USB assembly . . . . . . . . . . . . . . . 65 Replacing the WiFi units . . . . . . . . . 66 Installing or removing the rear WiFi antenna . 71 Installing or removing the front WiFi antenna . 73 Replacing the keyboard or mouse . . . . . 75 Completing the parts replacement . . . . . 76 Chapter 6. Recovery information . . . 79

© Copyright Lenovo 2013, 2015 i

Recovery information for the Windows 7 operating system. . . . . . . . . . . . . . . . . . 79 Creating and using recovery media . . . . . 79 Performing backup and recovery operations . 80 Using the Rescue and Recovery workspace . 81 Creating and using a rescue medium . . . . 82 Reinstalling preinstalled applications and device drivers . . . . . . . . . . . . . 83 Reinstalling software programs . . . . . . 84 Reinstalling device drivers . . . . . . . . 84 Solving recovery problems . . . . . . . . 84 Recovery information for the Windows 8 or Windows 8.1 operating system . . . . . . . . 85 Refreshing your computer . . . . . . . . 85 Resetting your computer to the factory default settings. . . . . . . . . . . . . . . . 85 Using the advanced startup options . . . . 85 Recovering your operating system if Windows 8 or Windows 8.1 fails to start . . . . . . . 86 Recovery information for the Windows 10 operating system. . . . . . . . . . . . . . . . . . 86 Chapter 7. Using the Setup Utility program . . . . . . . . . . . . . . . . 89 Starting the Setup Utility program . . . . . . . 89 Viewing and changing settings . . . . . . . . 89 Using BIOS passwords . . . . . . . . . . . 89 Password considerations . . . . . . . . . 90 Power-On Password . . . . . . . . . . 90 Administrator Password . . . . . . . . . 90 Hard Disk Password. . . . . . . . . . . 90 Setting, changing, and deleting a password . 90 Erasing lost or forgotten passwords (clearing CMOS) . . . . . . . . . . . . . . . . 91 Enabling or disabling a device . . . . . . . . 91 Selecting a startup device . . . . . . . . . . 91 Selecting a temporary startup device . . . . 92 Selecting or changing the startup device sequence . . . . . . . . . . . . . . . 92 Enabling ErP LPS compliance mode . . . . . . 92 Exiting the Setup Utility program . . . . . . . 93 Chapter 8. Updating system programs . . . . . . . . . . . . . . . 95 Using system programs . . . . . . . . . . . 95 Updating the BIOS . . . . . . . . . . . . . 95 Recovering from a POST/BIOS update failure . . 95 Chapter 9. Preventing problems . . . 97 Keeping your computer current . . . . . . . . 97 Getting the latest device drivers for your computer . . . . . . . . . . . . . . . 97 Getting the latest system updates . . . . . 97 ii ThinkCentre E73 User Guide Cleaning and maintenance . . . . . . . . . . 98 Basics . . . . . . . . . . . . . . . . 98 Cleaning your computer . . . . . . . . . 98 Good maintenance practices . . . . . . . 99 Moving your computer . . . . . . . . . . . 100 Chapter 10. Troubleshooting and diagnostics . . . . . . . . . . . . . 103 Basic troubleshooting . . . . . . . . . . . . 103 Troubleshooting procedure . . . . . . . . . . 104 Troubleshooting . . . . . . . . . . . . . . 105 Audio problems . . . . . . . . . . . . 105 CD problems . . . . . . . . . . . . . 106 DVD problems . . . . . . . . . . . . . 107 Intermittent problems . . . . . . . . . . 109 Keyboard, mouse, or pointing device problems . . . . . . . . . . . . . . . 109 Monitor problems. . . . . . . . . . . . 111 Networking problems . . . . . . . . . . 113 Option problems . . . . . . . . . . . . 115 Performance and lockup problems . . . . . 116 Printer problems . . . . . . . . . . . . 118 Serial connector problems . . . . . . . . 118 Software problems . . . . . . . . . . . 118 USB problems . . . . . . . . . . . . . 120 Diagnostic programs . . . . . . . . . . . . 120 Lenovo Solution Center . . . . . . . . . 120 Lenovo ThinkVantage Toolbox . . . . . . . 121 PC-Doctor for DOS . . . . . . . . . . . 121 Chapter 11. Getting information, help, and service . . . . . . . . . . . . . 123 Information resources . . . . . . . . . . . . 123 Windows help system . . . . . . . . . . 123 Safety and Warranty. . . . . . . . . . . 123 Lenovo Web site . . . . . . . . . . . . 123 Lenovo Support Web site. . . . . . . . . 124 Help and service . . . . . . . . . . . . . . 124 Using the documentation and diagnostic programs . . . . . . . . . . . . . . . 124 Calling for service. . . . . . . . . . . . 124 Using other services . . . . . . . . . . 125 Purchasing additional services . . . . . . 125 Appendix A. Notices. . . . . . . . . 127 Trademarks . . . . . . . . . . . . . . . . 128 Appendix B. Regulatory information . . . . . . . . . . . . . 129 Export classification notice . . . . . . . . . . 129 Television output notice . . . . . . . . . . . 129 Electronic emissions notices . . . . . . . . . 129 Federal Communications Commission Declaration of Conformity . . . . . . . . 129 Eurasian compliance mark . . . . . . . . . . 131 Brazil audio notice . . . . . . . . . . . . . 131 Mexico wireless-radio compliance information . . 131 Additional regulatory information . . . . . . . 132 Appendix C. WEEE and recycling information . . . . . . . . . . . . . 133 Important WEEE information . . . . . . . . . 133 Recycling information for Japan . . . . . . . . 133 Recycling information for Brazil . . . . . . . . 134 Battery recycling information for Taiwan. . . . . 134 Battery recycling information for the European Union . . . . . . . . . . . . . . . . . . 134 Appendix D. Restriction of Hazardous Substances Directive (RoHS) . . . . 137 European Union RoHS . . . . . . . . . . . 137 China RoHS. . . . . . . . . . . . . . . . 137 Turkish RoHS . . . . . . . . . . . . . . . 137 Ukraine RoHS . . . . . . . . . . . . . . . 138 India RoHS . . . . . . . . . . . . . . . . 138 Appendix E. China Energy Label . . 139 Appendix F. ENERGY STAR model information . . . . . . . . . . . . . 141 Index. . . . . . . . . . . . . . . . . 143

© Copyright Lenovo 2013, 2015 iii iv ThinkCentre E73 User Guide Important safety information CAUTION: Before using this manual, be sure to read and understand all the related safety information for this product. Refer to the information in this section and the safety information in the Safety, Warranty, and Setup Guide that you received with this product. Reading and understanding this safety information reduces the risk of personal injury and damage to your product. If you no longer have a copy of the Safety, Warranty, and Setup Guide, you can obtain a Portable Document Format (PDF) version from the Lenovo® Support Web site at lenovo.com/UserManuals. The Lenovo Support Web site also provides the Safety, Warranty, and Setup Guide and this User Guide in additional languages. Service and upgrades Do not attempt to service a product yourself unless instructed to do so by the Customer Support Center or your documentation. Only use a Service Provider who is approved to repair your particular product. Note: Some computer parts can be upgraded or replaced by the customer. Upgrades typically are referred to as options. Replacement parts approved for customer installation are referred to as Customer Replaceable Units, or CRUs. Lenovo provides documentation with instructions when it is appropriate for customers to install options or replace CRUs. You must closely follow all instructions when installing or replacing parts. The Off state of a power indicator does not necessarily mean that voltage levels inside a product are zero. Before you remove the covers from a product equipped with a power cord, always make sure that the power is turned off and that the product is unplugged from any power source. For more information on CRUs, refer to Chapter 5 “Installing or replacing hardware” on page 35. If you have any questions or concerns, contact the Customer Support Center. Although there are no moving parts in your computer after the power cord has been disconnected, the following warnings are required for your safety. CAUTION: Hazardous moving parts. Keep fingers and other body parts away. CAUTION: Before you open the computer cover, turn off the computer and wait several minutes until the computer is cool. Static electricity prevention Static electricity, although harmless to you, can seriously damage computer components and options. Improper handling of static-sensitive parts can cause damage to the part. When you unpack an option © Copyright Lenovo 2013, 2015 v or CRU, do not open the static-protective package containing the part until the instructions direct you to install it. When you handle options or CRUs, or perform any work inside the computer, take the following precautions to avoid static-electricity damage: • Limit your movement. Movement can cause static electricity to build up around you. • Always handle components carefully. Handle adapters, memory modules, and other circuit boards by the edges. Never touch exposed circuitry. • Prevent others from touching components. • When you install a static-sensitive option or CRU, touch the static-protective package containing the part to a metal expansion-slot cover or other unpainted metal surface on the computer for at least two seconds. This reduces static electricity in the package and your body. • When possible, remove the static-sensitive part from the static-protective packaging and install the part without setting it down. When this is not possible, place the static-protective packaging on a smooth, level surface and place the part on it. • Do not place the part on the computer cover or other metal surface. Power cords and power adapters Use only the power cords and power adapters supplied by the product manufacturer. Do not use the ac power cord for other devices. The power cords shall be safety approved. For Germany, it shall be H05VV-F, 3G, 0.75 mm2, or better. For other countries, the suitable types shall be used accordingly. Never wrap a power cord around a power adapter or other object. Doing so can stress the cord in ways that can cause the cord to fray, crack, or crimp. This can present a safety hazard. Always route power cords so that they will not be walked on, tripped over, or pinched by objects. Protect power cord and power adapters from liquids. For instance, do not leave your power cord or power adapter near sinks, tubs, toilets, or on floors that are cleaned with liquid cleansers. Liquids can cause a short circuit, particularly if the power cord or power adapter has been stressed by misuse. Liquids also can cause gradual corrosion of power cord terminals and/or the connector terminals on a power adapter, which can eventually result in overheating. Ensure that all power cord connectors are securely and completely plugged into receptacles. Do not use any power adapter that shows corrosion at the ac input pins or shows signs of overheating (such as deformed plastic) at the ac input or anywhere on the power adapter. Do not use any power cords where the electrical contacts on either end show signs of corrosion or overheating or where the power cord appears to have been damaged in any way. Extension cords and related devices Ensure that extension cords, surge protectors, uninterruptible power supplies, and power strips that you use are rated to handle the electrical requirements of the product. Never overload these devices. If power strips are used, the load should not exceed the power strip input rating. Consult an electrician for more information if you have questions about power loads, power requirements, and input ratings. vi ThinkCentre E73 User Guide Plugs and outlets If a receptacle (power outlet) that you intend to use with your computer equipment appears to be damaged or corroded, do not use the outlet until it is replaced by a qualified electrician. Do not bend or modify the plug. If the plug is damaged, contact the manufacturer to obtain a replacement. Do not share an electrical outlet with other home or commercial appliances that draw large amounts of electricity; otherwise, unstable voltage might damage your computer, data, or attached devices. Some products are equipped with a three-pronged plug. This plug fits only into a grounded electrical outlet. This is a safety feature. Do not defeat this safety feature by trying to insert it into a non-grounded outlet. If you cannot insert the plug into the outlet, contact an electrician for an approved outlet adapter or to replace the outlet with one that enables this safety feature. Never overload an electrical outlet. The overall system load should not exceed 80 percent of the branch circuit rating. Consult an electrician for more information if you have questions about power loads and branch circuit ratings. Be sure that the power outlet you are using is properly wired, easily accessible, and located close to the equipment. Do not fully extend power cords in a way that will stress the cords. Be sure that the power outlet provides the correct voltage and current for the product you are installing. Carefully connect and disconnect the equipment from the electrical outlet. External devices Do not connect or disconnect any external device cables other than Universal Serial Bus (USB) and 1394 cables while the computer power is on; otherwise, you might damage your computer. To avoid possible damage to attached devices, wait at least five seconds after the computer is shut down to disconnect external devices. Heat and product ventilation Computers, power adapters, and many accessories can generate heat when turned on and when batteries are charging. Always follow these basic precautions: • Do not leave your computer, power adapter, or accessories in contact with your lap or any part of your body for an extended period when the products are functioning or when the battery is charging. Your computer, power adapter, and many accessories produce some heat during normal operation. Extended contact with the body could cause discomfort or, potentially, a skin burn. • Do not charge the battery or operate your computer, power adapter, or accessories near flammable materials or in explosive environments. • Ventilation slots, fans, and heat sinks are provided with the product for safety, comfort, and reliable operation. These features might inadvertently become blocked by placing the product on a bed, sofa, carpet, or other flexible surface. Never block, cover, or disable these features. Inspect your desktop computer for dust accumulation at least once every three months. Before inspecting your computer, turn off the power and unplug the computer's power cord from the electrical outlet; then remove any dust from vents and perforations in the bezel. If you notice external dust accumulation, then examine and remove dust from the inside of the computer including heat sink inlet fins, power supply vents, and fans. Always turn off and unplug the computer before opening the cover. If possible, avoid operating your computer within two feet of high-traffic areas. If you must operate your computer in or near a high-traffic area, inspect and, if necessary, clean your computer more frequently. © Copyright Lenovo 2013, 2015 vii For your safety and to maintain optimum computer performance, always follow these basic precautions with your desktop computer: • Keep the cover closed whenever the computer is plugged in. • Regularly inspect the outside of the computer for dust accumulation. • Remove dust from vents and any perforations in the bezel. More frequent cleanings might be required for computers in dusty or high-traffic areas. • Do not restrict or block any ventilation openings. • Do not store or operate your computer inside furniture, as this might increase the risk of overheating. • Airflow temperatures into the computer should not exceed 35°C (95°F). • Do not install air filtration devices. They may interfere with proper cooling. Operating environment The optimal environment in which to use your computer is 10°C-35°C (50°F-95°F) with humidity ranging between 35% and 80%. If your computer is stored or transported in temperatures less than 10°C (50°F), allow the cold computer to rise slowly to an optimal operating temperature of 10°C-35°C (50°F-95°F) before use. This process could take two hours in extreme conditions. Failure to allow your computer to rise to an optimal operating temperature before use could result in irreparable damage to your computer. If possible, place your computer in a well-ventilated and dry area without direct exposure to sunshine. Keep electrical appliances such as an electric fan, radio, high-powered speakers, air conditioner, and microwave oven away from your computer because the strong magnetic fields generated by these appliances can damage the monitor and data on the hard disk drive. Do not place any beverages on top of or beside the computer or other attached devices. If liquid is spilled on or in the computer or an attached device, a short circuit or other damage might occur. Do not eat or smoke over your keyboard. Particles that fall into your keyboard can cause damage. Laser compliance statement CAUTION: When laser products (such as CD-ROMs, DVD drives, fiber optic devices, or transmitters) are installed, note the following: • Do not remove the covers. Removing the covers of the laser product could result in exposure to hazardous laser radiation. There are no serviceable parts inside the device. • Use of controls or adjustments or performance of procedures other than those specified herein might result in hazardous radiation exposure. DANGER Some laser products contain an embedded Class 3A or Class 3B laser diode. Note the following: Laser radiation when open. Do not stare into the beam, do not view directly with optical instruments, and avoid direct exposure to the beam. viii ThinkCentre E73 User Guide Power supply statement Never remove the cover on a power supply or any part that has the following label attached. Hazardous voltage, current, and energy levels are present inside any component that has this label attached. There are no serviceable parts inside these components. If you suspect a problem with one of these parts, contact a service technician. Cleaning and maintenance Keep your computer and workspace clean. Shut down the computer and then disconnect the power cord before cleaning the computer. Do not spray any liquid detergent directly on the computer or use any detergent containing flammable material to clean the computer. Spray the detergent on a soft cloth and then wipe the computer surfaces. © Copyright Lenovo 2013, 2015 ix x ThinkCentre E73 User Guide Chapter 1. Product overview This chapter provides information about the computer features, specifications, software programs provided by Lenovo, and locations of connectors, components, parts on the system board, and internal drives. Features This section introduces the computer features. The information covers a variety of models. To view the information about your specific model, do one of the following: • On the Microsoft® Windows®7 operation system, click Start, right-click Computer, and select Properties to view the information. • On the Microsoft Windows 8 or Windows 8.1 operating system, go to the desktop and move your pointer to the top-right or bottom-right corner of the screen to display the charms. Then click Settings ➙ PC info to view the information. • On the Microsoft Windows 10 operating system, click the Start button to open the Start menu. Then, click Settings ➙ System ➙ About to view the information. Microprocessor To view the microprocessor information of your computer, do the following: • On the Microsoft Windows 7 operation system, click Start, right-click Computer, and select Properties to view the information. • On the Microsoft Windows 8 or Windows 8.1 operating system, go to the desktop and move your pointer to the top-right or bottom-right corner of the screen to display the charms. Then click Settings ➙ PC info to view the information. • On the Microsoft Windows 10 operating system, click the Start button to open the Start menu. Then, click Settings ➙ System ➙ About to view the information. Memory Your computer supports up to two double data rate 3 unbuffered dual inline memory modules (DDR3 UDIMMs). Internal drives • Optical drive: DVD-ROM or DVD-R (available in some models) • Hybrid drive (available in some models) • Serial Advanced Technology Attachment (SATA) hard disk drive • SATA solid-state drive (available in some models) Video subsystem • Integrated graphics for a Video Graphics Array (VGA) connector and a DisplayPort®connector • Peripheral Component Interconnect (PCI) Express x16 graphics card slot on the system board for a discrete graphics card Audio subsystem • Integrated high-definition (HD) audio © Copyright Lenovo 2013, 2015 1 • Audio line-in connector, audio line-out connector, and microphone connector on the rear panel • Microphone connector and headphone connector on the front panel • Internal speaker (installed in some models) Connectivity • PCI Express Fax modem (some models) System management features • Ability to store power-on self-test (POST) hardware test results • Desktop Management Interface (DMI) Desktop Management Interface provides a common path for users to access information about all aspects of a computer, including processor type, installation date, attached printers and other peripherals, power sources, and maintenance history. • ErP LPS compliance mode The energy-related products directive (ErP) lowest power state (LPS) compliance mode reduces the consumption of electricity when your computer is in sleep or off mode. For more information, see “Enabling ErP LPS compliance mode” on page 92. • Preboot Execution Environment (PXE) The Preboot Execution Environment is an environment to start computers using a network interface independent of data storage devices (such as the hard disk drive) or installed operating systems. • System Management (SM) Basic Input/Output System (BIOS) and SM software The SM BIOS specification defines data structures and access methods in a BIOS that allows a user or application to store and retrieve information specific about the computer in question. • Wake on LAN Wake on LAN is an Ethernet computer networking standard that allows a computer to be turned on or woken up by a network message. The message is usually sent by a program running on another computer on the same local area network. • Wake on Ring Wake on Ring, sometimes referred to as Wake on Modem, is a specification that allows supported computers and devices to resume from sleep or hibernation mode. • Windows Management Instrumentation (WMI) Windows Management Instrumentation is a set of extensions to the Windows Driver Model. It provides an operating system interface through which instrumented components provide information and notification. 2 ThinkCentre E73 User Guide Input/Output (I/O) features • One DisplayPort connector • One Ethernet connector • One 9-pin serial connector (optional) • One VGA monitor connector • Six Universal Serial Bus (USB) connectors – Two USB 2.0 connectors on the front panel – Two USB 2.0 connectors on the rear panel – Two USB 3.0 connectors on the rear panel • Three audio connectors on the rear panel (audio line-in connector, audio line-out connector, and microphone connector) • Two audio connectors on the front panel (microphone connector and headphone connector) For more information, see “Locating connectors, controls, and indicators on the front of your computer” on page 9 and “Locating connectors on the rear of your computer” on page 10. Expansion • One optical drive bay • One PCI Express x16 graphics card slot • One secondary solid-state drive bay (optional) • One slim card reader drive bay • Two hard disk drive bays (one standard and one optional) • Two PCI Express x1 card slots Power supply Your computer comes with one of the following power supplies: • 180-watt automatic voltage-sensing power supply • 240-watt automatic voltage-sensing power supply Security features • Computrace Agent software embedded in firmware • Ability to enable or disable a device • Ability to enable and disable USB connectors individually • Power-on password (POP), administrator password, and hard disk drive password to deter unauthorized use of your computer • Startup sequence control • Startup without keyboard or mouse • Support for a Kensington-style cable lock • Support for a padlock For more information, see Chapter 4 “Security” on page 31. Preinstalled software programs Chapter 1. Product overview 3 Your computer is preinstalled with software programs to help you work more easily and securely. For more information, see “Lenovo programs” on page 5. Preinstalled operating system Your computer is preinstalled with one of the following operating systems: • Microsoft Windows 7 operating system • Microsoft Windows 8 operating system • Microsoft Windows 8.1 operating system • Microsoft Windows 10 operating system Operating system(s), certified or tested for compatibility1(varies by model type) • Linux® 1. The operating system(s) listed here are being certified or tested for compatibility at the time this publication goes to press. Additional operating systems might be identified by Lenovo as compatible with your computer following the publication of this manual. This list is subject to change. To determine if an operating system has been certified or tested for compatibility, check the Web site of the operating system vendor. 4 ThinkCentre E73 User Guide Specifications This section lists the physical specifications for your computer. Dimensions Width: 97 mm (3.8 inches) Height: 333 mm (13.1 inches) Depth: 368 mm (14.5 inches) Weight Maximum configuration as shipped: 6 kg (13.2 lb) (without package) Maximum configuration as shipped: 8.5 kg (18.7 lb) (with package) Environment • Air temperature: Operating: 10°C to 35°C (50°F to 95°F) Storage in original shipping package: -40°C to 60°C (-40°F to 140°F) Storage without package: -10°C to 60°C (14°F to 140°F) • Humidity: Operating: 20% to 80% (non-condensing) Storage: 20% to 90% (non-condensing) • Altitude: Operating: -50 to 10 000 ft (-15.2 to 3048 m) Storage: -50 to 35 000 ft (-15.2 to 10 668 m) Electrical input • Input voltage: – Low range: Minimum: 100 V ac Maximum: 127 V ac Input frequency range: 50/60 Hz Voltage-selection switch setting: 115 V ac – High range: Minimum: 200 V ac Maximum: 240 V ac Input frequency range: 50/60 Hz Voltage-selection switch setting: 230 V ac Lenovo programs Your computer comes with Lenovo programs to help you work more easily and securely. Depending on the Windows operating system preinstalled, the programs might vary. Accessing a program on your computer Note: For Windows 7, some of the Lenovo programs might be ready to be installed, so you need to install them manually. Then, you can access and use these programs. To install a program that is ready to be installed, open the Lenovo ThinkVantage®Tools program, and then view the program icons using Tiles. Chapter 1. Product overview 5 Follow the instructions under greyed-out icons to locate the icon for the desired program. Double-click the icon to install the program. To access a program on your computer, do one of the following: • For Windows 7 or Windows 10: – From Windows Search: 1. Depending on your Windows version, do one of the following: – For Windows 7: Click the Start button to open the Start menu, and then type the program name into the search box. – For Windows 10: Type the program name into the search box next to the Start button. 2. In the search results, click the name of the desired program to launch the program. – From the Start menu or Control Panel: 1. Click the Start button to open the Start menu. Then, click the name of the desired program to launch the program. 2. If the program name is not displayed, click All Programs for Windows 7 or All apps for Windows 10 to display the program list. From the list or a folder in the list, click the name of the desired program to launch the program. 3. If the program name is not displayed on the Start menu, access the program from Control Panel. a. Depending on your Windows version, do one of the following: – For Windows 7: Click Control Panel on the Start menu. – For Windows 10: Right-click the Start button to open the Start context menu, and then click Control Panel. b. View Control Panel using Large icons or Small icons, and then click the name of the desired program to launch the program. • For Windows 8 or Windows 8.1: 1. Press the Windows key to go to the Start screen. Click the name of the desired program to launch the program. 2. If you cannot find the program you need, depending on your Windows version, do one of the following: – For Windows 8: Move the pointer to the bottom-right corner of the screen to display the charms. Then click the Search charm to search for the desired program. – For Windows 8.1: Click the arrow icon in the bottom-left corner of the screen to go to the Apps screen. Find the desired program in the apps list or search for it in the search box in the top-right corner of the screen. An introduction to Lenovo programs This section provides information about the major Lenovo programs available on your operating system. Note: Depending on your computer model, some of the following programs might not be available. • For Windows 7 only: – Create Recovery Media The Create Recovery Media program enables you to restore only the C drive or the entire storage drive to the factory-default settings. – Lenovo PowerENGAGE The Lenovo PowerENGAGE program enables you to register your computer with Lenovo. 6 ThinkCentre E73 User Guide – Message Center Plus The Message Center Plus program automatically displays messages informing you about important notices from Lenovo, such as alerts on system updates and alerts on conditions that require your attention. – Rescue and Recovery® The Rescue and Recovery program is a one-button recovery and restore solution. It includes a set of self-recovery tools to help you diagnose computer problems, get help, and recover from system crashes, even if you cannot start the Windows operating system. • For Windows 10 only: – Lenovo ID The Lenovo ID program enables you to create your Lenovo ID and access all supported Lenovo programs and web portals with single sign-on. • For Windows 8 and Windows 8.1: – Lenovo Support The Lenovo Support program enables you to register your computer with Lenovo, check the computer health condition and battery status, download and view user manuals for your computer, get the warranty information of your computer, and explore help and support information. • For Windows 7, Windows 8, and Windows 8.1: – Fingerprint Manager Pro or ThinkVantage Fingerprint Software The Fingerprint Manager Pro or ThinkVantage Fingerprint Software program enables you to use a fingerprint reader. The integrated fingerprint reader provided on some keyboards enables you to enroll your fingerprint and associate it with your power-on password, hard disk password, and Windows password. As a result, fingerprint authentication can replace passwords and enable simple and secure user access. – Password Manager The Password Manager program automatically captures and fills in authentication information for Windows programs and Web sites. • For Windows 7, Windows 8.1, and Windows 10: – Lenovo Bluetooth Lock The Lenovo Bluetooth Lock program enables you to use a Bluetooth device (such as your smartphone) as a proximity-based unit for locking or unlocking your computer automatically. By detecting the distance between your computer and the predefined Bluetooth device that you are carrying, the Lenovo Bluetooth Lock program automatically locks your computer when you walk away and unlocks your computer when you come back. This is a simple way to protect your computer against unauthorized access in case that you forget to lock your computer. – PC Cloud Manager The PC Cloud Manager (PCM) program is a browser-based solution for client-computer management. The PCM program has two components: PCM Server and PCM Client. PCM Server is installed on the computer, where the administrator performs management work, such as power management and security management. PCM Client is installed on the client computers to be managed. The administrator can log in to PCM Server to manage computers with PCM Client installed, through the Internet Web browser. • For Windows 8, Windows 8.1, and Windows 10: Chapter 1. Product overview 7 – Lenovo Companion Your computer’s best features and capabilities should be easy to access and understand. With Lenovo Companion, they are. Use Lenovo Companion to do the following: – Optimize your computer’s performance, monitor your computer’s health, and manage updates. – Access your user guide, check warranty status, and view accessories customized for your computer. – Read how-to articles, explore Lenovo forums, and stay up-to-date on technology news with articles and blogs from trusted sources. Lenovo Companion is filled with exclusive Lenovo content to help you learn more about what you can do with your computer. • For Windows 7, Windows 8, Windows 8.1, and Windows 10: – Lenovo Device Experience or Lenovo PC Experience The Lenovo Device Experience or Lenovo PC Experience program helps you work more easily and securely. The program provides easy access to Lenovo ThinkVantage Tools or Lenovo Tools, important settings and information about your computer, the Lenovo Support Web site, and so on. – Lenovo Solution Center The Lenovo Solution Center program enables you to troubleshoot and resolve computer problems. It combines diagnostic tests, system information collection, security status, and support information, along with hints and tips for maximum system performance. – Power Manager The Power Manager program provides convenient, flexible, and complete power management for your computer. It enables you to adjust your computer power settings to achieve the best balance between performance and power saving. – REACHit or Lenovo Reach The REACHit or Lenovo Reach program enhances your cloud experience. This program keeps you connected at all times and enables you to access all your favorite items from personal computers, smartphones, or tablets. As a result, you can access, edit, and share your files from anywhere. You also can add your favorite Web services to your cloud desktop and stay logged-in to Web sites with the cloud password manager. – SHAREit or Lenovo SHAREit The SHAREit or Lenovo SHAREit program provides a quick and easy way to share files and folders among computers, smartphones, tablets, or smart TVs with the Android or the Windows operating system installed. SHAREit or Lenovo SHAREit uses any type of network or even no network at all to share files and folders. – System Update The System Update program provides regular access to the system updates for your computer, such as device driver updates, software updates, and BIOS updates. The program gathers information from the Lenovo Help Center about new updates for your computer, then sorts and displays the updates for download and installation. You have complete control of which updates to download and install. Locations This section provides information to help you locate the connectors on the front and rear of your computer, parts on the system board, and components and internal drives in your computer. 8 ThinkCentre E73 User Guide Locating connectors, controls, and indicators on the front of your computer Figure 1 “Front connector, control, and indicator locations” on page 9 shows the locations of the connectors, controls, and indicators on the front of your computer. Figure 1. Front connector, control, and indicator locations 1 Optical drive eject/close button 2 Power button 3 Hard disk drive activity indicator 4 Power indicator 5 USB 2.0 connector 6 Microphone connector 7 Headphone connector 8 USB 2.0 connector Chapter 1. Product overview 9 Locating connectors on the rear of your computer Figure 2 “Rear connector locations” on page 10 shows the locations of the connectors on the rear of your computer. Some connectors on the rear of your computer are color-coded to help you determine where to connect the cables on your computer. 5 6 5 6 3 4 3 4 Figure 2. Rear connector locations 1 Power cord connector 2 DisplayPort connector 3 VGA monitor connector 4 USB 3.0 connectors 5 USB 2.0 connectors 6 Microphone connector 7 Audio line-out connector 8 Audio line-in connector 9 PCI Express x16 graphics card slot 10 PCI Express x1 card slots (2) 11 Ethernet connector 12 Security-lock slot 13 Padlock loop Note: If your computer is installed with a graphics card, ensure that you use the monitor connectors on the graphics card. Connector Description Audio line-in connector Used to receive audio signals from an external audio device, such as a stereo system. When you attach an external audio device, a cable is connected between the audio line-out connector of the device and the audio line-in connector of the computer. Audio line-out connector Used to send audio signals from the computer to external devices, such as powered stereo speakers (speakers with built-in amplifiers), headphones, multimedia keyboards, or the audio line-in connector on a stereo system or other external recording device. 10 ThinkCentre E73 User Guide

Connector Description DisplayPort connector Used to attach a high-performance monitor, a direct-drive monitor, or other devices that use a DisplayPort connector. Ethernet connector Used to attach an Ethernet cable for a local area network (LAN). Note: To operate the computer within Federal Communications Commission (FCC) Class B limits, use a Category 5e or better Ethernet cable. Microphone connector Used to attach a microphone to your computer when you want to record sound or if you use speech-recognition software. USB 2.0 connector Used to attach a device that requires a USB 2.0 connection, such as a keyboard, a mouse, a scanner, a printer, or a personal digital assistant (PDA). USB 3.0 connector Used to attach a device that requires a USB 2.0 or 3.0 connection, such as a keyboard, a mouse, a scanner, a printer, or a personal digital assistant (PDA). A USB 3.0 connector provides high transmission speeds to reduce the time that is required for data transmission. VGA monitor connector Used to attach a VGA monitor or other devices that use a VGA monitor connector. Chapter 1. Product overview 11

Locating components Figure 3 “Component locations” on page 12 shows the locations of the various components in your computer. To remove the computer cover, see “Removing the computer cover” on page 35. Figure 3. Component locations 1 Heat sink and fan assembly 2 Power supply assembly 3 Memory modules (2) 4 Optical drive 5 Front audio and USB assembly 6 Front bezel 7 System fan assembly 8 Thermal sensor 9 Hard disk drive 10 PCI Express card (installed in some models) 11 Heat sink fan duct 12 ThinkCentre E73 User Guide Locating parts on the system board Figure 4 “System board part locations” on page 13 shows the locations of the parts on the system board. Figure 4. System board part locations 1 4-pin power connector 2 Microprocessor 3 Microprocessor fan connector 4 Memory slot 1 (DIMM1) 5 Memory slot 2 (DIMM2) 6 Thermal sensor connector 7 Power fan connector 8 Hard disk drive/ Optical drive power connectors (number and location vary by model) 9 14-pin power connector 10 BIOS ROM 11 SATA 3.0 connectors 12 Power supply fan connector 13 SATA 2.0 connector 14 Front panel connector (for connecting LED indicators and the power button)

15 Front USB connector 1 (for connecting USB ports 1 and 2 on the front bezel) 17 Clear CMOS (Complementary Metal Oxide Semiconductor) /Recovery jumper 16 Front USB connector 2 (for connecting an additional USB device) 18 Serial (COM2) connector

19 Front audio connector 20 Internal speaker connector 21 PCI Express x1 card slots (2) 22 PCI Express x16 graphics card slot 23 System fan connector 24 Battery Chapter 1. Product overview 13 Locating internal drives Internal drives are devices that your computer uses to read and store data. You can add drives to your computer to increase storage capacity and enable your computer to read other types of media. Internal drives are installed in bays. In this manual, the bays are referred to as bay 1, bay 2, and so on. When installing or replacing an internal drive, it is important to note the type and size of the drive that you can install or replace in each bay and correctly connect the cables to the drive installed. Refer to the appropriate section in “Installing or replacing hardware” on page 35 for instructions on how to install or replace internal drives for your computer. Figure 5 “Drive bay locations” on page 14 shows the locations of the drive bays. Figure 5. Drive bay locations 1 Secondary hard disk drive bay (with a SATA solid-state drive or a hybrid drive installed in some models) 2 Optical drive bay (with an optical drive installed in some models) 3 Slim card reader drive bay (with a slim card reader installed in some models) 4 Hard disk drive bay (with a 2.5-inch or 3.5-inch SATA hard disk drive installed) 14 ThinkCentre E73 User Guide Machine type and model label The machine type and model label identifies your computer. When you contact Lenovo for help, the machine type and model information helps support technicians to identify your computer and provide faster service. The following is a sample of the machine type and model label. Machine Type: XXXX Model Number: XXX Figure 6. Machine type and model label Chapter 1. Product overview 15 16 ThinkCentre E73 User Guide Chapter 2. Using your computer This chapter provides information on using some of the computer components. Frequently asked questions The following are a few tips that will help you optimize the use of your computer. Can I get my user guide in another language? The user guide is available in various languages on the Lenovo Support Web site at: lenovo.com/UserManuals Where is my recovery disc set or recovery USB key? Depending on your Windows version, your computer comes with a recovery disc set or recovery USB key. If your computer does not come with it, contact the Lenovo Customer Support Center to order a recovery disc set or recovery USB key. For a list of Lenovo Support phone numbers, go to lenovo.com/support/phone. If you cannot find the support telephone number for your country or region, contact your Lenovo reseller. Where can I find help about the Windows operating system? See “Windows help system” on page 123. Can I change the Windows 8.1 startup behavior to open either the desktop or the Start screen? On the Windows 8.1 operating system, you can set the computer to open either the desktop or the Start screen by default. To set the default startup screen, do the following: 1. On the desktop, move your pointer to the taskbar at the bottom of the screen and right-click on the taskbar. 2. Click Properties. The Taskbar and Navigation properties window is displayed. 3. On the Navigation tab, locate the Start screen section, and then do one of the following: • To set the desktop as your default startup screen, select When I sign in or close all apps on a screen, go to the desktop instead of Start so a check is visible. • To set the Start screen as your default startup screen, remove the check from the When I sign in or close all apps on the screen, go to desktop instead of Start checkbox. 4. Click OK to save the new setting. This feature is not available on the Windows 8 operating system. Navigating among screens on the Windows 8 and Windows 8.1 operating systems This section provides instructions on how to navigate among the desktop, the Start screen, and applications that were opened from the Start screen on the Windows 8 and Windows 8.1 operating systems. For detailed instructions, see “Navigating on Windows 8” on page 17 or “Navigating on Windows 8.1” on page 19. Navigating on Windows 8 To navigate among the desktop, the Start screen, and applications that were opened from the Start screen on the Windows 8 operating system, do one of the following: © Copyright Lenovo 2013, 2015 17 • From the Start screen, do one of the following to navigate to the most recently accessed workspace (application, PC settings, or desktop): – Using a pointing device: Move the pointer to the extreme bottom-left corner of the screen until a small representation of the workspace is displayed; then click the representation. – Using a touch screen: Swipe in and out on the left edge of the screen. Representations of all available workspaces are displayed along the left edge of the screen. Tap the representation of the workspace at the bottom. Note: The representation of a workspace is displayed only if you have at least one active workspace in the background of the system. • From the desktop or any other workspace that is opened from the Start screen, do one of the following to navigate to the Start screen: – Using a pointing device: Move the pointer to the extreme bottom-left corner of the screen until a small representation of the Start screen is displayed; then click the representation. – Using a touch screen: Do one of the following: – Swipe in and out on the left edge of the screen. Representations of all available workspaces are displayed along the left edge of the screen. Tap the representation of the Start screen at the bottom. – Swipe in from the right edge of the screen to display the charms; then tap Start. • From any workspace (Start screen, desktop, PC settings, or application opened from the Start screen), use any of the following procedures to go to another workspace that you have previously opened: – To navigate to a previously accessed workspace (application, PC settings, or desktop), do one of the following: – Using a pointing device: 1. Do one of the following: • Move the pointer to the extreme top-left corner of the screen and then move the pointer downward along the left edge of the screen. • Move the pointer to the extreme bottom-left corner of the screen and then move the pointer upward along the left edge of the screen. Representations of all available workspaces are displayed along the left edge of the screen. Note: Only active workspaces that you have accessed during the current Windows session are displayed along the left edge. If you close an active workspace, its representation does not display along the left edge of the screen. 2. Click the representation. – Using a touch screen: • Method 1 1. Swipe in and out on the left edge of the screen. Representations of all available workspaces are displayed along the left edge of the screen. 2. Tap the desired workspace. • Method 2 1. Swipe in from the left edge of the screen to navigate to the next available workspace. 2. Repeat step 1 until you navigate to the desired workspace. – To navigate to the most recently accessed workspace (application, PC settings, or desktop), do one of the following: – Using a pointing device: Move the pointer to the extreme top-left corner of the screen until a small representation of the workspace is displayed; then click the representation. 18 ThinkCentre E73 User Guide

– Using a touch screen: Swipe in from the left edge of the screen. For information about using other features of the Windows 8 operating system, refer to the Windows help system. For more information, see “Windows help system” on page 123. Navigating on Windows 8.1 To navigate among the desktop, the Start screen, and applications that were opened from the Start screen on the Windows 8.1 operating system, do one of the following: • From the Start screen, do one of the following to navigate to the most recently accessed workspace (application, setting, or desktop): – Using a pointing device: Move the pointer to the extreme bottom-left corner of the screen until the Windows screen-control icon is displayed; then click the icon. – Using a touch screen: Swipe in and out on the left edge of the screen. Representations of all available workspaces are displayed along the left edge of the screen. Tap the Windows screen-control icon at the bottom. Note: The Windows screen-control icon is displayed only if you have at least one active workspace in the background of the system. • From the desktop or any other workspace that is opened from the Start screen, do one of the following to navigate to the Start screen: – Using a pointing device: – From the desktop, click the Windows screen-control icon in the bottom-left corner of the screen. – From any other workspace, move the pointer to the extreme bottom-left corner of the screen until the Windows screen-control icon is displayed; then click the icon. – Using a touch screen: Do one of the following: – From the desktop, tap the Windows screen-control icon in the bottom-left corner of the screen. – From any other workspace, do one of the following: • Swipe in and out on the left edge of the screen. Representations of all available workspaces are displayed along the left edge of the screen. Tap the Windows screen-control icon at the bottom. • Swipe in from the right edge of the screen to display the charms; then tap Start. • From any workspace (Start screen, desktop, PC settings, or application opened from the Start screen), use any of the following procedures to go to another workspace that you have previously opened: – To navigate to a previously accessed workspace (application, setting, or desktop), do one of the following: – Using a pointing device: 1. Do one of the following: • Move the pointer to the extreme top-left corner of the screen and then move the pointer downward along the left edge of the screen. • Move the pointer to the extreme bottom-left corner of the screen and then move the pointer upward along the left edge of the screen. Representations of all available workspaces are displayed along the left edge of the screen. Chapter 2. Using your computer 19

Note: Only active workspaces that you have accessed during the current Windows session are displayed along the left edge. If you close an active workspace, its representation does not display along the left edge of the screen. 2. Click the representation. – Using a touch screen: • Method 1 1. Swipe in and out on the left edge of the screen. Representations of all available workspaces are displayed along the left edge of the screen. 2. Tap the desired workspace. • Method 2 1. Swipe in from the left edge of the screen to navigate to the next available workspace. 2. Repeat step 1 until you navigate to the desired workspace. – To navigate to the most recently accessed workspace (application, PC settings, or desktop), do one of the following: – Using a pointing device: Move the pointer to the extreme top-left corner of the screen until the Windows screen-control icon is displayed; then click the icon. – Using a touch screen: Swipe in from the left edge of the screen. For information about using other features of the Windows 8.1 operating system, open the Help+Tips application from the Start screen or Apps screen, or refer to the Windows help system. For more information, see “Windows help system” on page 123. Accessing Control Panel on the Windows 8 or Windows 8.1 operating system On the Windows operating system, you can view and change computer settings through Control Panel. To access Control Panel on the Windows 8 or Windows 8.1 operating system, do one of the following: • From the desktop 1. Move the pointer to the top-right or bottom-right corner of the screen to display the charms. 2. Click Settings. 3. Click Control Panel. • From the Start screen – For Windows 8: 1. Move the pointer to the top-right or bottom-right corner of the screen to display the charms. 2. Click Search. 3. On the Apps screen, scroll to the right side, and click Control Panel in the Windows System section. – For Windows 8.1: 1. Click the arrow icon in the bottom-left corner of the screen to go to the Apps screen. 2. Scroll to the right side, and click Control Panel in the Windows System section. Using Windows shortcut keys Both the standard keyboard and the fingerprint reader keyboard provide three keys you can use with your Microsoft Windows operating system. 20 ThinkCentre E73 User Guide • The two Windows logo keys are located beside the Alt key on either side of the spacebar. They feature the Windows logo. On the Windows 7 or Windows 10 operating system, press the Windows key to open the Start menu. On the Windows 8 or Windows 8.1 operating system, press the Windows key to switch between the current workspace and the Start screen. The style of the Windows logo varies depending on the keyboard type. • The context-menu key is located next to the Ctrl key on the right side of the Spacebar. Pressing the context-menu key opens the context menu for the active program, icon, or object. Note: You can use the mouse or the Up and Down arrow keys to highlight menu selections. On the Windows 7 operating system, you can close the Start menu or the context menu by clicking the mouse or pressing Esc. Using the wheel mouse The wheel mouse has the following controls: 1 Primary mouse button Use this button to select or start a program or menu item. 2 Wheel Use the wheel to control the scrolling action of the mouse. The direction in which you rotate the wheel controls the direction of the scrolling action. 3 Secondary mouse button Use this button to display a menu for the active program, icon, or object. You can switch the function of the primary and secondary mouse buttons and change other default behavior through the mouse properties function in the Windows Control Panel. Setting the computer volume To set the computer volume, do the following: 1. Click the volume icon in the Windows notification area on the taskbar. Note: If the volume icon is not displayed in the Windows notification area, add the icon to the notification area. See “Adding an icon to the Windows notification area” on page 21. 2. Follow the instructions on the screen to adjust the volume. Click the speaker icon to mute the audio. Adding an icon to the Windows notification area To add an icon to the Windows notification area, do the following: 1. Click the arrow next to the notification area to view hidden icons. Then, click the desired icon and drag it to the notification area. 2. If the icon is not displayed, turn on the icon. a. Depending on your Windows version, do one of the following: Chapter 2. Using your computer 21

• For Windows 7: Click the Start button to open the Start menu, and then click Control Panel. View Control Panel using Large icons or Small icons, and then click Notification Area Icons ➙ Turn system icons on or off. • For Windows 8 or Windows 8.1: Open Control Panel. View Control Panel using Large icons or Small icons, and then click Notification Area Icons ➙ Turn system icons on or off. Note: For detailed information on how to open Control Panel on Windows 8 and Windows 8.1, see “Accessing Control Panel on the Windows 8 or Windows 8.1 operating system” on page 20. • For Windows 10: Click the Start button to open the Start menu. Then, click Settings ➙ System ➙ Notifications & actions ➙ Turn system icons on or off. b. Turn on the desired icon. 3. If the icon is still not displayed in the Windows notification area, repeat step 1. Using CDs and DVDs Your computer might have a DVD ROM drive or recordable DVD drive installed. DVD drives use industry-standard, 12 cm (4.75-inch) CD media or DVD media. If your computer comes with a DVD drive, the drive can read DVD-ROM discs, DVD-R discs, DVD-RAM discs, DVD-RW discs, and all types of CDs, such as CD-ROM discs, CD-RW discs, CD-R discs, and audio CDs. If you have a recordable DVD drive, it can also record on DVD-R discs, DVD-RW discs, type II DVD-RAM discs, CD-RW standard and high speed discs, and CD-R discs. Follow these guidelines when using the DVD drive: • Do not place the computer in a location where the drive is exposed to the following: – High temperature – High humidity – Excessive dust – Excessive vibration or sudden shock – An inclined surface – Direct sunlight • Do not insert any object other than a CD or DVD into the drive. • Before moving the computer, remove the CD or DVD from the drive. Handling and storing CD and DVD media CD and DVD media are durable and reliable, but they do require some care and special handling. When handling and storing a CD or DVD, follow these guidelines: • Hold the disc by its edges. Do not touch the surface of the side that is not labeled. • To remove dust or fingerprints, wipe the disc with a clean, soft cloth from the center to the outside. Wiping the disc in a circular direction might cause loss of data. • Do not write or stick paper on the disc. • Do not scratch or mark the disc. • Do not place or store the disc in direct sunlight. • Do not use benzene, thinners, or other cleaners to clean the disc. • Do not drop or bend the disc. • Do not insert damaged discs into the drive. Warped, scratched, or dirty discs can damage the drive. 22 ThinkCentre E73 User Guide

Playing a CD or DVD If your computer comes with a DVD drive, you can listen to audio CDs or watch DVD movies. To play a CD or DVD, do the following: 1. Press the Eject/Load button on the DVD drive to open the tray. 2. With the tray fully extended, insert the CD or DVD into the tray. Some DVD drives have a snap hub in the center of the tray. If your drive has a snap hub, support the tray with one hand and then push the center of the CD or DVD until it snaps into place. 3. Press the Eject/Load button again or gently push the tray forward to close the tray. The CD or DVD player program starts automatically. For additional information, refer to the CD or DVD player program help system. To remove a CD or DVD from the DVD drive, do the following: 1. With the computer on, press the Eject/Load button. When the tray slides out automatically, carefully remove the disc. 2. Close the tray by pressing the Eject/Load button or by gently pushing the tray forward. Note: If the tray does not slide out of the drive when you press the Eject/Load button, insert a straightened paper clip into the emergency-eject hole on the front of the DVD drive. Make sure that the drive is powered off when using the emergency eject. Use the Eject/Load button instead of the emergency eject except in an emergency. Recording a CD or DVD If your optical drive supports recording, you can record a CD or DVD. To record a CD or DVD, do the following: 1. Insert a recordable disc into the optical drive that supports recording. 2. Open the PowerDVD Create, PowerProducer, or Power2Go program. See “Accessing a program on your computer” on page 5. 3. Follow the instructions on the screen. Chapter 2. Using your computer 23 24 ThinkCentre E73 User Guide Chapter 3. You and your computer This chapter provides information about accessibility, comfort, and relocating your computer to other countries or regions. Accessibility and comfort Good ergonomic practice is important to get the most from your personal computer and to avoid discomfort. Arrange your workplace and the equipment you use to suit your individual needs and the kind of work that you perform. In addition, use healthy work habits to maximize your performance and comfort while using your computer. The following topics provide information about arranging your work area, setting up your computer equipment, and establishing healthy work habits. Arranging your workspace To get the most from your computer, arrange both the equipment you use and your work area to suit your needs and the kind of work you do. Your comfort is of foremost importance, but light sources, air circulation, and the location of electrical outlets can also affect the way you arrange your workspace. Comfort Although no single working position is ideal for everyone, here are a few guidelines to help you find a position that suits you best. Sitting in the same position for a long time can cause fatigue. The backrest and seat of your chair should adjust independently and provide good support. The seat should have a curved front to relieve pressure on the thighs. Adjust the seat so that your thighs are parallel to the floor and your feet are either flat on the floor or on a footrest. When using the keyboard, keep your forearms parallel to the floor and your wrists in a comfortable position. Use a light touch on the keyboard and your hands and fingers relaxed. Change the angle of the keyboard for maximum comfort by adjusting the position of the keyboard feet. Adjust the monitor so the top of the screen is at, or slightly below, eye level. Place the monitor at a comfortable viewing distance, usually 51 to 61 cm (20 to 24 inches), and position it so you can view it without having to twist your body. Also, position other equipment you use regularly, such as the telephone or a mouse, within easy reach. © Copyright Lenovo 2013, 2015 25 Glare and lighting Position the monitor to minimize glare and reflections from overhead lights, windows, and other light sources. Reflected light from shiny surfaces can cause annoying reflections on your monitor screen. Place the monitor at right angles to windows and other light sources, when possible. Reduce overhead lighting, if necessary, by turning off lights or using lower wattage bulbs. If you install the monitor near a window, use curtains or blinds to block the sunlight. You can adjust the brightness and contrast controls on the monitor as the room lighting changes throughout the day. Where it is impossible to avoid reflections or to adjust the lighting, an antiglare filter placed over the screen might be helpful. However, these filters might affect the clarity of the image on the screen; try them only after you have exhausted other methods of reducing glare. Dust buildup compounds problems associated with glare. Remember to clean your monitor screen periodically using a soft cloth as directed in your monitor documentation. Air circulation Your computer and monitor produce heat. The computer has a fan that pulls in fresh air and forces out hot air. The monitor lets hot air escape through vents. Blocking the air vents can cause overheating, which might result in a malfunction or damage. Place the computer and monitor so that nothing blocks the air vents; usually, 51 mm (2 inches) of air space is sufficient. Also, make sure that the vented air is not blowing on people. Electrical outlets and cable lengths The location of electrical outlets, the length of power cords and cables that connect to the monitor, printer, and other devices might determine the final placement of your computer. When arranging your workspace: • Avoid the use of extension cords. When possible, plug the computer power cord directly into an electrical outlet. • Keep power cords and cables neatly routed away from walkways and other areas where they might get kicked accidentally. For more information about power cords, see “Power cords and power adapters” on page vi. Accessibility information Lenovo is committed to providing users who have hearing, vision, and mobility limitations with greater access to information and technology. This section provides information about the ways these users can get the most out of their computer experience. You also can get the most up-to-date accessibility information from the following Web site: lenovo.com/accessibility Keyboard shortcuts The following table contains keyboard shortcuts that can help make your computer easier to use. Note: Depending on your keyboard, some of the following keyboard shortcuts might not be available. Keyboard shortcut Function Windows logo key + U Open Ease of Access Center Right Shift for eight seconds Turn on or turn off Filter Keys 26 ThinkCentre E73 User Guide Keyboard shortcut Function Shift five times Turn on or turn off Sticky Keys Num Lock for five seconds Turn on or turn off Toggle Keys Left Alt+Left Shift+Num Lock Turn on or turn off Mouse Keys Left Alt+Left Shift+PrtScn (or PrtSc) Turn on or turn off High Contrast For more information, go to windows.microsoft.com/, and then perform a search using any of the following keywords: keyboard shortcuts, key combinations, shortcut keys. Ease of Access Center Ease of Access Center on the Windows operating system enables users to configure their computers to suit their physical and cognitive needs. To use Ease of Access Center, do the following: 1. Depending on your Windows version, do one of the following: • For Windows 7: Click the Start button to open the Start menu, and then click Control Panel. View Control Panel using Large icons or Small icons, and then click Ease of Access Center. • For Windows 8 or Windows 8.1: Move the pointer to the top-right or bottom-right corner of the screen to display the charms. Then, click Settings ➙ Change PC settings ➙ Ease of Access. • For Windows 10: Click the Start button to open the Start menu. Then, click Settings ➙ Ease of Access. 2. Choose the appropriate tool by following the instructions on the screen. Ease of Access Center mainly includes the following tools: • Magnifier Magnifier is a useful utility that enlarges the entire screen or part of the screen so that you can see the items better. • Narrator Narrator is a screen reader that reads aloud what is displayed on the screen and describes events such as error messages. • On-Screen Keyboard If you prefer to type or enter data into your computer using a mouse, joystick, or other pointing device instead of a physical keyboard, you can use On-Screen Keyboard. On-Screen Keyboard displays a visual keyboard with all the standard keys. • High Contrast High Contrast is a feature that heightens the color contrast of some text and images on your screen. As a result, those items are more distinct and easier to identify. • Personalized keyboard Adjust keyboard settings to make your keyboard easier to use. For example, you can use your keyboard to control the pointer and type certain key combinations easier. • Personalized mouse Adjust mouse settings to make your mouse easier to use. For example, you can change the pointer appearance and make it easier to manage windows with the mouse. Speech Recognition Speech Recognition enables you to control your computer by voice. Chapter 3. You and your computer 27 Using only your voice, you can start programs, open menus, click objects on the screen, dictate text into documents, and write and send e-mails. Everything you do with the keyboard and mouse can be done with only your voice. To use Speech Recognition, do the following: 1. Depending on your Windows version, do one of the following: • For Windows 7: Click the Start button to open the Start menu, and then click Control Panel. • For Windows 8 or Windows 8.1: Open Control Panel. See “Accessing Control Panel on the Windows 8 or Windows 8.1 operating system” on page 20. • For Windows 10: Right-click the Start button to open the Start context menu, and then click Control Panel. 2. View Control Panel using Large icons or Small icons, and then click Speech Recognition. 3. Follow the instructions on the screen. Screen-reader technologies Screen-reader technologies are primarily focused on software program interfaces, help information systems, and various online documents. For additional information about screen readers, see the following: • Using PDFs with screen readers: adobe.com/accessibility.html?promoid=DJGVE • Using the JAWS screen reader: freedomscientific.com/jaws-hq.asp • Using the NVDA screen reader: nvaccess.org/ Screen resolution You can make the text and images on your screen easier to read by adjusting the screen resolution of your computer. To adjust the screen resolution, do the following: 1. Right-click a blank area on the desktop. 2. Depending on your Windows version, do one of the following: • For Windows 7, Windows 8, or Windows 8.1: Click Screen resolution. • For Windows 10: Click Display settings. On the Display tab, click Advanced display settings. 3. Follow the instructions on the screen. Note: Setting the resolution too low might prevent some items from fitting on the screen. Customizable item size You can make the items on your screen easier to read by changing the item size. • To change the item size temporarily, use the Magnifier tool in Ease of Access Center. See “Ease of Access Center” on page 27. • To change the item size permanently, do the following: – Change the size of all the items on your screen. 1. Right-click a blank area on the desktop. 2. Depending on your Windows version, do one of the following: 28 ThinkCentre E73 User Guide – For Windows 7, Windows 8, or Windows 8.1: Click Screen resolution ➙ Make text and other items larger or smaller. – For Windows 10: Click Display settings. 3. Change the item size by following the instructions on the screen. 4. Click Apply. This change will take effect the next time you log in to the operating system. – Change the size of the items on a Web page. Press and hold Ctrl, and then press the plus-sign key (+) to enlarge or the minus-sign key (-) to reduce the text size. – Change the size of the items on the desktop or a window. Note: This function might not work on some windows. If your mouse has a wheel, press and hold Ctrl, and then scroll the wheel to change the item size. Industry-standard connectors Your computer provides industry-standard connectors that enable you to connect assistive devices. For more information about the location and function of the connectors, see “Locations” on page 8. TTY/TDD conversion modem Your computer supports the use of a text telephone (TTY) or the telecommunications device for the deaf (TDD) conversion modem. The modem must be connected between your computer and a TTY/TDD telephone. Then, you can type a message on your computer and send it to the telephone. Documentation in accessible formats Lenovo provides electronic documentation in accessible formats, such as properly tagged PDF files or HyperText Markup Language (HTML) files. Lenovo electronic documentation is developed to ensure that visually impaired users can read the documentation through a screen reader. Each image in the documentation also includes adequate alternative text so that visually impaired users can understand the image when they use a screen reader. Registering your computer When you register your computer with Lenovo, you enter required information into a Lenovo database. The information enables Lenovo to contact you when there is a recall or other severe problem and provide quicker service when you call Lenovo for help. In addition, some locations offer extended privileges and services to registered users. To register your computer with Lenovo, ensure that your computer is connected to the Internet. Then, go to lenovo.com/register and follow the instructions on the screen. Moving your computer to another country or region When you move your computer to another country or region, you must take local electrical standards into consideration. If you relocate your computer to a country or region that uses an electrical outlet style different from the type you are currently using, you will have to purchase either electrical plug adapters or new power cords. You can order power cords directly from Lenovo. For power cord information and part numbers, go to: lenovo.com/powercordnotice Chapter 3. You and your computer 29 30 ThinkCentre E73 User Guide

Chapter 4. Security This chapter provides information about how to protect your computer from theft and unauthorized use. Security features The following security features are available on your computer: • Computrace Agent software embedded in firmware The Computrace Agent software is an IT asset management and computer theft recovery solution. The software detects if changes have been made on the computer, such as hardware, software, or the computer call-in location. Note: You might have to purchase a subscription to activate the Computrace Agent software. • Ability to enable and disable devices and USB connectors For more information, see “Enabling or disabling a device” on page 91. • Startup sequence control For more information, see “Selecting or changing the startup device sequence” on page 92. • Startup without keyboard or mouse Your computer is able to log in to the operating system without keyboard or mouse connected. © Copyright Lenovo 2013, 2015 31

Locking the computer cover Locking the computer cover helps prevent unauthorized people from gaining access to the inside of your computer. Your computer comes with a padlock loop so that the computer cover cannot be removed when a padlock is installed. 5 6 3 4 Figure 7. Installing a padlock 32 ThinkCentre E73 User Guide Attaching a Kensington-style cable lock You can use a Kensington-style cable lock to secure your computer to a desk, table, or other non-permanent fixture. The cable lock attaches to the security-lock slot at the rear of your computer and is operated with a key or combination depending on the type selected. The cable lock also locks the buttons used to open the computer cover. This is the same type of lock used with many notebook computers. You can order such a cable lock directly from Lenovo by searching for Kensington at: lenovo.com/support 5 6 3 4 Figure 8. Kensington-style cable lock Preventing unauthorized access to your computer You can use BIOS passwords and Windows accounts to prevent unauthorized access to your computer and data. • To use BIOS passwords, see “Using BIOS passwords” on page 89. • To use Windows accounts, do the following: 1. Depending on your Windows version, do one of the following: – For Windows 7: Click the Start button to open the Start menu, and then click Control Panel ➙ User Accounts. – For Windows 8 or Windows 8.1: Move the pointer to the top-right or bottom-right corner of the screen to display the charms. Then, click Settings ➙ Change PC settings ➙ Accounts. – For Windows 10: Click the Start button to open the Start menu, and then click Settings ➙ Accounts. 2. Follow the instructions on the screen. Chapter 4. Security 33 Using fingerprint authentication If your keyboard has a fingerprint reader, you can use fingerprint authentication to replace passwords for simple and secure user access. To use fingerprint authentication, first enroll your fingerprints and associate them with your passwords (such as the power-on password, hard disk password, and Windows password). Use the fingerprint reader and the fingerprint program to complete this procedure. To use fingerprint authentication, do one of the following: • For Windows 7, Windows 8, or Windows8.1: Use the Fingerprint Manager Pro or ThinkVantage Fingerprint Software program provided by Lenovo. To open the program, see “Accessing a program on your computer” on page 5. For more information about using the program, refer to the help system of the program. • For Windows 10: Use the fingerprint tool provided by Windows. Click the Start button to open the Start menu, and then click Settings ➙ Accounts ➙ Sign-in options. Follow the instructions on the screen. To use the fingerprint reader, refer to the documentation shipped with the fingerprint keyboard or located on the Lenovo Support Web site at lenovo.com/support/keyboards. Using and understanding firewalls A firewall can be hardware, software, or a combination of both depending on the level of security required. Firewalls work on a set of rules to determine which inbound and outbound connections are authorized. If your computer is preintalled with a firewall program, it helps protect against computer Internet security threats, unauthorized access, intrusions, and Internet attacks. It also protects your privacy. For more information about how to use the firewall program, refer to the help system of your firewall program. The Windows operating system preinstalled on your computer provides the Windows Firewall. For details on using the Windows Firewall, refer to “Windows help system” on page 123. Protecting data against viruses Your computer is preinstalled with an antivirus program to help you guard against, detect, and eliminate viruses. Lenovo provides a full version of antivirus software on your computer with a free 30-day subscription. After 30 days, you must renew the license to continue receiving the antivirus software updates. Note: Virus definition files must be kept up-to-date to guard against new viruses. For more information about how to use your antivirus software, refer to the help system of your antivirus software. 34 ThinkCentre E73 User Guide Chapter 5. Installing or replacing hardware This chapter provides instructions on how to install or replace hardware for your computer. Handling static-sensitive devices Do not open the static-protective package containing the new part until the defective part has been removed from the computer and you are ready to install the new part. Static electricity, although harmless to you, can seriously damage computer components and parts. When you handle parts and other computer components, take these precautions to avoid static-electricity damage: • Limit your movement. Movement can cause static electricity to build up around you. • Always handle parts and other computer components carefully. Handle PCI Express cards, memory modules, system boards, and microprocessors by the edges. Never touch any exposed circuitry. • Prevent others from touching the parts and other computer components. • Before you replace a new part, touch the static-protective package containing the part to a metal expansion-slot cover or other unpainted metal surface on the computer for at least two seconds. This reduces static electricity from the package and your body. • When possible, remove the new part from the static-protective packaging, and install it directly in the computer without setting the part down. When this is not possible, place the static-protective package that the part came in on a smooth, level surface and place the part on it. • Do not place the part on the computer cover or other metal surface. Installing or replacing hardware This section provides instructions on how to install or replace hardware for your computer. You can expand the capabilities of your computer and maintain your computer by installing or replacing hardware. Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. Notes: 1. Use only computer parts provided by Lenovo. 2. When installing or replacing an option, use the appropriate instructions in this section along with the instructions that come with the option. Installing external options You can connect external options to your computer, such as external speakers, a printer, or a scanner. For some external options, you must install additional software in addition to making the physical connection. When installing an external option, see “Locating connectors, controls, and indicators on the front of your computer” on page 9 and “Locating connectors on the rear of your computer” on page 10 to identify the required connector. Then, use the instructions that come with the option to help you make the connection and install any software or device drivers that are required for the option. Removing the computer cover Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. © Copyright Lenovo 2013, 2015 35

This section provides instructions on how to remove the computer cover. CAUTION: Before you open the computer cover, turn off the computer and wait several minutes until the computer is cool. To remove the computer cover, do the following: 1. Remove any media from the drives and turn off all attached devices and the computer. 2. Disconnect all power cords from electrical outlets. 3. Disconnect the power cords, Input/Output cables, and any other cables that are connected to the computer. See “Locating connectors, controls, and indicators on the front of your computer” on page 9 and “Locating connectors on the rear of your computer” on page 10. 4. Remove any locking device that secures the computer cover, such as a padlock or a Kensington-style cable lock. See “Locking the computer cover” on page 32 and “Attaching a Kensington-style cable lock” on page 33. 5. Remove the two screws that secure the computer cover and slide the computer cover to the rear to remove it. 6 5 4 3 Figure 9. Removing the computer cover Removing and reinstalling the front bezel Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. This section provides instructions on how to remove and reinstall the front bezel. To remove and reinstall the front bezel, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 36 ThinkCentre E73 User Guide

3. Remove the front bezel by releasing the three plastic tabs on the top of the front bezel and pivoting the front bezel outward to remove it from the computer. Carefully lay the front bezel aside without disconnecting the power switch and light-emitting diode (LED) assembly cable. Figure 10. Removing the front bezel 4. To reinstall the front bezel, align the other three plastic tabs on the bottom of the front bezel with the corresponding holes in the chassis, then pivot the front bezel inward until it snaps into position. Figure 11. Reinstalling the front bezel What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 76. Accessing the system board components and drives Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. Chapter 5. Installing or replacing hardware 37 This section provides instructions on how to access the system board components and drives. To access the system board components and drives, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 36. 4. Pivot the drive bay assembly upward to access all the internal drives, cables, and other components. 6 5 4 3 Figure 12. Pivoting the drive bay assembly upward 5. To lower the drive bay assembly, press the drive bay assembly clip 1 inward and pivot the drive bay assembly downward as shown. Figure 13. Lowering the drive bay assembly 38 ThinkCentre E73 User Guide Installing or replacing a PCI Express card Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. This section provides instructions on how to install or replace a PCI Express card. Your computer has two PCI Express x1 card slots and one PCI Express x16 graphics card slot. To install or replace a PCI Express card, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Depending on whether you are installing or replacing a PCI Express card, do one of the following: • If you are installing a PCI Express card, remove the screw that secures the appropriate metal slot cover. Then, remove the metal slot cover. Chapter 5. Installing or replacing hardware 39 • If you are replacing an old PCI Express card, remove the screw that secures the old PCI Express card, grasp the old card that is currently installed, and gently pull it out of the slot. 6 5 4 3 Figure 14. Removing a PCI Express card Notes: a. The card fits tightly into the card slot. If necessary, alternate moving each side of the card a small amount until it is removed from the card slot. b. If the card is held in place by a retaining latch, press the card retaining latch 1 as shown to disengage the latch. Grasp the card and gently pull it out of the slot. 4. Remove the new PCI Express card from its static-protective package. 5. Install the new PCI Express card into the appropriate slot on the system board. See “Locating parts on the system board” on page 13. Note: If you are installing a PCI Express x16 graphics card, make sure that the memory slot retaining clips are closed before you install the graphics card. 6. Install the screw to secure the new PCI Express card in place. 40 ThinkCentre E73 User Guide What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 76. Installing or replacing a memory module Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. This section provides instructions on how to install or replace a memory module. Your computer has two slots for installing or replacing DDR3 UDIMMs that provide up to a maximum of 8 GB system memory. When installing or replacing a memory module, use 1 GB, 2 GB, or 4 GB DDR3 UDIMMs in any combination up to a maximum of 8 GB. To install or replace a memory module, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 36. 4. Pivot the drive bay assembly upward to gain access to the memory slots. See “Accessing the system board components and drives” on page 37. 5. Remove the heat sink fan duct. See “Replacing the heat sink and fan assembly” on page 58. 6. Locate the memory slots. See “Locating parts on the system board” on page 13. 7. Remove any parts that might prevent your access to the memory slots. Depending on your computer model, you might need to remove the PCI Express x16 graphics card for easier access to the memory slots. See “Installing or replacing a PCI Express card” on page 39. 8. Depending on whether you are installing or replacing a memory module, do one of the following: • If you are replacing an old memory module, open the retaining clips and gently pull the memory module out of the memory slot. Figure 15. Removing a memory module Chapter 5. Installing or replacing hardware 41 • If you are installing a memory module, open the retaining clips of the memory slot into which you want to install the memory module. Figure 16. Opening the retaining clips 9. Position the new memory module over the memory slot. Make sure that the notch 1 on the memory module aligns correctly with the slot key 2 on the system board. Push the memory module straight down into the slot until the retaining clips close. Figure 17. Installing a memory module 10. Reinstall the PCI Express x16 graphics card if you have removed it. What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 76. Replacing the battery Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. Your computer has a special type of memory that maintains the date, time, and settings for built-in features, such as parallel-connector assignments (configuration). A battery keeps this information active when you turn off the computer. 42 ThinkCentre E73 User Guide The battery normally requires no charging or maintenance throughout its life; however, no battery lasts forever. If the battery fails, the date, time, and configuration information (including passwords) are lost. An error message is displayed when you turn on the computer. Refer to the “Lithium battery notice” in the Safety, Warranty, and Setup Guide for information about replacing and disposing of the battery. To replace the battery, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Locate the battery. See “Locating parts on the system board” on page 13. 4. Remove the old battery. Figure 18. Removing the old battery 5. Install a new battery. Figure 19. Installing a new battery 6. Reinstall the computer cover and connect the cables. See “Completing the parts replacement” on page 76. Note: When the computer is turned on for the first time after replacing the battery, an error message might be displayed. This is normal after replacing the battery. 7. Turn on the computer and all attached devices. 8. Use the Setup Utility program to set the date, time, and any passwords. See Chapter 7 “Using the Setup Utility program” on page 89. What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 76. Replacing the hard disk drive Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. Chapter 5. Installing or replacing hardware 43 This section provides instructions on how to replace the hard disk drive. To replace the hard disk drive, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 36. 4. Note the location of the four screws 1 that secure the hard disk drive. Then, pivot the drive bay assembly upward. 6 5 4 3 Figure 20. Pivoting the drive bay assembly 5. Hold the hard disk drive and remove the four screws that secure the hard disk drive. Then, remove the hard disk drive from the drive bay assembly. 6 5 4 3 Figure 21. Removing the hard disk drive 44 ThinkCentre E73 User Guide 6. Disconnect the signal cable and the power cable from the hard disk drive to completely remove the hard disk drive from the chassis. 7. Connect one end of the signal cable to the rear of the new hard disk drive and the other end to an available SATA connector on the system board. See “Locating parts on the system board” on page 13. Then, locate an available five-wire power connector and connect it to the rear of the new hard disk drive. Figure 22. Connecting a SATA hard disk drive 8. Position the new hard disk drive into the hard disk drive bay and align the screw holes in the new hard disk drive with the corresponding holes in the drive bay. Then, install the four screws to secure the new hard disk drive in place. 6 5 4 3 Figure 23. Installing the hard disk drive What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 76. Replacing the optical drive Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. Chapter 5. Installing or replacing hardware 45 This section provides instructions on how to install or replace the optical drive. Note: The optical drive is only available in some models. To replace an optical drive, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 36. 4. Pivot the drive bay assembly upward. See “Accessing the system board components and drives” on page 37 5. Disconnect the signal cable and the power cable from the optical drive. 6. Hold the optical drive and remove the two screws that secure the optical drive. Figure 24. Removing the optical drive 46 ThinkCentre E73 User Guide 7. Press the drive bay assembly clip 1 inward and pivot the drive bay assembly downward as shown. Figure 25. Lowering the drive bay assembly 8. Slide the optical drive out of the front of the computer. Figure 26. Removing the optical drive Chapter 5. Installing or replacing hardware 47 9. Slide the new optical drive into the optical drive bay from the front of the computer. Figure 27. Installing a new optical drive 10. Hold the new optical drive and pivot the drive bay assembly upward. Align the screw holes in the new optical drive with the corresponding holes in the drive bay. Then, install the two screws to secure the new optical drive in place. Figure 28. Installing the optical drive 48 ThinkCentre E73 User Guide 11. Connect one end of the signal cable to the rear of the new optical drive and the other end to an available SATA connector on the system board. See “Locating parts on the system board” on page 13. Then, locate an available five-wire power connector and connect it to the rear of the new optical drive. Figure 29. Connecting the optical drive 12. Lower the drive bay assembly. What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 76. Replacing the solid-state drive Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. This section provides instructions on how to replace the solid-state drive. The solid-state drive is only available in some models. It might be installed in the hard disk drive bay or on the bottom of the optical drive bay. • To replace the solid-state drive in the hard disk drive bay, see “Replacing the solid-state drive in the hard disk drive bay” on page 49. • To replace the solid-state drive on the bottom of the optical drive bay, see “Replacing the solid-state drive on the bottom of the optical drive bay” on page 51. Replacing the solid-state drive in the hard disk drive bay To replace the storage converter with the solid-state drive installed in it, you might follow the steps of replacing the hard disk drive. See “Replacing the hard disk drive” on page 43. To replace the solid-state drive in the storage converter, do the following: Chapter 5. Installing or replacing hardware 49 1. Remove the four screws that secure the solid-state drive to the storage converter. Then, remove the drive from the converter as shown. Figure 30. Removing the solid-state drive from the storage converter 2. Take the new solid-state drive out of the static-protective package. 3. Position the solid-state drive into the storage converter so that the holes in the drive are aligned with the corresponding holes in the converter. Then, install the four screws to secure the solid-state drive to the converter. Figure 31. Installing the solid-state drive into the storage converter 50 ThinkCentre E73 User Guide Replacing the solid-state drive on the bottom of the optical drive bay To replace the solid-state drive on the bottom of the optical drive bay, do the following: 1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 36. 4. Pivot the drive bay assembly upward. See “Accessing the system board components and drives” on page 37. 5. Note the cable routing and disconnect the signal cable and the power cable from the solid-state drive. See “Locating parts on the system board” on page 13. 6. Remove the screw 1 and then carefully slide the solid-state drive bracket upward to remove the bracket from the bottom of the optical drive bay. 6 5 4 3 Figure 32. Removing the solid-state drive bracket Chapter 5. Installing or replacing hardware 51 7. Remove the four screws that secure the solid-state drive to the bracket. Then, slide the drive as shown to remove it from the bracket. Figure 33. Removing the solid-state drive from the bracket 8. Take the new solid-state drive out of the static-protective package. 9. Slide the new solid-state drive into the solid-state drive bracket as shown until the four holes in the drive are aligned with the corresponding holes in the bracket. Then, install the four screws to secure the new solid-state drive to the bracket. Figure 34. Installing the solid-state drive into the bracket 52 ThinkCentre E73 User Guide

10. Carefully slide the solid-state drive bracket downward until it is secured by the three retaining clips 1 on the bottom of the optical drive bay. 6 5 4 3 Figure 35. Installing the solid-state drive bracket 11. Install the screw 1 to secure the bracket on the bottom of the optical drive bay. Chapter 5. Installing or replacing hardware 53

6 5 4 3

Figure 36. Installing the screw to secure the bracket on the bottom of the optical drive bay 12. Connect one end of the signal cable to the bottom of the new solid-state drive and the other end to an available SATA connector on the system board. See “Locating parts on the system board” on page 13. Then, locate an available four-wire power connector and connect it to the bottom of the new solid-state drive. What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 76. Replacing the power supply assembly Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. This section provides instructions on how to replace the power supply assembly. Although there are no moving parts in your computer after the power cord has been disconnected, the following warnings are required for your safety and proper Underwriters Laboratories (UL) certification. CAUTION: 54 ThinkCentre E73 User Guide Hazardous moving parts. Keep fingers and other body parts away. CAUTION: Never remove the cover on a power supply or any part that has the following label attached. Hazardous voltage, current, and energy levels are present inside any component that has this label attached. There are no serviceable parts inside these components. If you suspect a problem with one of these parts, contact a service technician. To replace the power supply assembly, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 36. 4. Pivot the drive bay assembly upward. Then, pivot the two plastic retaining clips outward to remove the heat sink fan duct from the failing heat sink and fan assembly. 6 5 4 3 Figure 37. Removing the heat sink fan duct 5. Disconnect the power supply assembly cables from all drives and from the 24-pin power connector and 4-pin power connector on the system board. See “Locating parts on the system board” on page 13. Note: You might also need to release the power supply assembly cables from some cable clips or ties that secure the cables to the chassis. Make sure that you note the cable routing before disconnecting the cables. Chapter 5. Installing or replacing hardware 55 6. At the rear of the computer, remove the three screws that secure the power supply assembly. Press the power supply clip 1 downward to release the power supply assembly and then slide the power supply assembly to the front of the computer. Lift the power supply assembly out of the computer. 6 5 4 3 Figure 38. Removing the power supply assembly 7. Make sure that the new power supply assembly is the correct replacement. 56 ThinkCentre E73 User Guide 8. Install the new power supply assembly into the chassis so that the screw holes in the new power supply assembly are aligned with the corresponding holes in the rear of the chassis. Then, install the three screws to secure the new power supply assembly in place. Note: Use only screws provided by Lenovo. 6 5 4 3 Figure 39. Installing the power supply assembly 9. Connect the new power supply assembly cables to all drives and the system board. See “Locating parts on the system board” on page 13. Chapter 5. Installing or replacing hardware 57 10. Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until it snaps into position. 6 5 4 3 Figure 40. Installing the heat sink fan duct 11. Secure the power supply assembly cables with the cable clips and ties in the chassis. What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 76. Replacing the heat sink and fan assembly Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. This section provides instructions on how to replace the heat sink and fan assembly. CAUTION: The heat sink and fan assembly might be very hot. Before you open the computer cover, turn off the computer and wait several minutes until the computer is cool. To replace the heat sink and fan assembly, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 36. 58 ThinkCentre E73 User Guide 4. Pivot the drive bay assembly upward. Then, pivot the two plastic retaining clips outward to remove the heat sink fan duct from the failing heat sink and fan assembly. 6 5 4 3 Figure 41. Removing the heat sink fan duct 5. Disconnect the heat sink and fan assembly cable from the microprocessor fan connector on the system board. See “Locating parts on the system board” on page 13. Chapter 5. Installing or replacing hardware 59 6. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the system board: a. Partially remove screw 1 , then fully remove screw 2 , and then fully remove screw 1 . b. Partially remove screw 3 , then fully remove screw 4 , and then fully remove screw 3 . Note: Carefully remove the four screws from the system board to avoid any possible damage to the system board. The four screws cannot be removed from the heat sink and fan assembly. Figure 42. Removing the heat sink and fan assembly 7. Lift the failing heat sink and fan assembly off the system board. Notes: a. You might have to gently twist the heat sink and fan assembly to free it from the microprocessor. b. When handling the heat sink and fan assembly, do not touch the thermal grease on the bottom of the heat sink and fan assembly. 8. Place the new heat sink and fan assembly on the system board so that the four screws are aligned with the corresponding holes in the system board. Note: Position the new heat sink and fan assembly so that the heat sink and fan assembly cable is toward the microprocessor fan connector on the system board. 9. Follow the following sequence to install the four screws to secure the new heat sink and fan assembly. Do not over-tighten the screws. a. Partially tighten screw 1 , then fully tighten screw 2 , and then fully tighten screw 1 . b. Partially tighten screw 3 , then fully tighten screw 4 , and then fully tighten screw 3 . 10. Connect the new heat sink and fan assembly cable to the microprocessor fan connector on the system board. See “Locating parts on the system board” on page 13. 11. Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until it snaps into position. 60 ThinkCentre E73 User Guide 6 5 4 3 Figure 43. Installing the heat sink fan duct What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 76. Replacing the microprocessor Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. This section provides instructions on how to replace the microprocessor. CAUTION: The heat sink and microprocessor might be very hot. Before you open the computer cover, turn off the computer and wait several minutes until the computer is cool. To replace the microprocessor, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Remove the heat sink and fan assembly. See “Replacing the heat sink and fan assembly” on page 58. Note: Place the heat sink and fan assembly on its side so that the thermal grease on the bottom of it does not get in contact with anything. 4. Locate the system board and disconnect all cables connected to the system board. See “Locating parts on the system board” on page 13. Chapter 5. Installing or replacing hardware 61

5. Lift the small handle 1 and open the retainer 2 to access the microprocessor 3 . Figure 44. Accessing the microprocessor 6. Lift the microprocessor straight up and out of the microprocessor socket. Figure 45. Removing the microprocessor Notes: a. Your microprocessor and socket might look different from the one illustrated. 62 ThinkCentre E73 User Guide

b. Note the orientation of the microprocessor in the socket. You can either look for the small triangle 1 on one corner of the microprocessor or note the orientation of the notches 2 on the microprocessor. This is important when installing the new microprocessor on the system board. c. Touch only the edges of the microprocessor. Do not touch the gold contacts on the bottom. d. Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must be kept as clean as possible. 7. Make sure that the small handle is in the raised position and the microprocessor retainer is fully open. 8. Remove the protective cover that protects the gold contacts of the new microprocessor. 9. Hold the new microprocessor by its sides and align the small triangle on one corner of the new microprocessor with the corresponding small triangle on one corner of the microprocessor socket. 10. Lower the new microprocessor straight down into the microprocessor socket on the system board. Figure 46. Installing the microprocessor 11. Close the microprocessor retainer and lock it into position with the small handle to secure the new microprocessor in the socket. 12. Reinstall the heat sink and fan assembly. See “Replacing the heat sink and fan assembly” on page 58. 13. Reconnect all cables that were disconnected from the system board. Chapter 5. Installing or replacing hardware 63 What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the replacement, go to “Completing the parts replacement” on page 76. Replacing the system fan assembly Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. This section provides instructions on how to replace the system fan assembly. To replace the system fan assembly, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 36. 4. Pivot the drive bay assembly upward to gain access to the system fan assembly. See “Accessing the system board components and drives” on page 37. 5. Remove the hard disk drive for easier access to the system fan assembly. See “Replacing the hard disk drive” on page 43. 6. Remove the heat sink fan duct. See “Replacing the heat sink and fan assembly” on page 58. 7. Note the cable routing and disconnect the system fan assembly cable from the power fan connector on the system board. See “Locating parts on the system board” on page 13. 8. The system fan assembly is attached to the chassis by four rubber mounts. Remove the system fan assembly by cutting the four rubber mounts 1 and lifting the system fan assembly out of the chassis. Note: The new system fan assembly will have four new rubber mounts attached. 6 5 4 3 Figure 47. Removing the system fan assembly 64 ThinkCentre E73 User Guide 9. Install the new system fan assembly by aligning the new rubber mounts that came with the new system fan assembly with the corresponding holes in the chassis, and then push the rubber mounts through the holes. Then, carefully pull on the tips of the rubber mounts from the bottom until the new system fan assembly is secured in place. 6 5 4 3 Figure 48. Installing the system fan assembly 10. Connect the new system fan assembly cable to the system fan connector on the system board. See “Locating parts on the system board” on page 13. 11. Reinstall the heat sink fan duct. See “Replacing the heat sink and fan assembly” on page 58. 12. Reinstall the hard disk drive. See “Replacing the hard disk drive” on page 43. What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 76. Replacing the front audio and USB assembly Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. This section provides instructions on how to replace the front audio and USB assembly. To replace the front audio and USB assembly, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 36. Chapter 5. Installing or replacing hardware 65 4. Pivot the drive bay assembly upward. See “Accessing the system board components and drives” on page 37. 5. Disconnect the front audio and USB assembly cables from the system board. See “Locating parts on the system board” on page 13. Note: Make sure that you note the locations of the cables when you disconnect the cables from the system board. 6. Remove the screw that secures the front audio and USB assembly bracket to the chassis to remove the bracket from the chassis. Figure 49. Removing the front audio and USB assembly 7. Install the front audio and USB assembly bracket into the chassis and align the screw hole in the bracket with the corresponding hole in the chassis. 8. Install the screw to secure the bracket to the chassis. 9. Pivot the drive bay assembly upward and reconnect the front USB and front audio cables to the system board. See “Locating parts on the system board” on page 13. 10. Reconnect the front audio and USB assembly cables to the front audio connector and the front USB connector on the system board. See “Locating parts on the system board” on page 13. 11. Lower the drive bay assembly. See “Accessing the system board components and drives” on page 37. 12. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 36. What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 76. Replacing the WiFi units Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page v. This section provides instructions on how to replace the WiFi units. The WiFi units include a WiFi adapter card, a WiFi card module, and a rear WiFi antenna cable. 66 ThinkCentre E73 User Guide Replacing the WiFi units involves the following operations: • “Removing the WiFi adapter card” on page 67 • “Removing the WiFi card module” on page 67 • “Installing the WiFi units” on page 69 Removing the WiFi adapter card To remove the WiFi adapter card, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 35. 3. Remove the screw that secures the WiFi adapter card. 4. Grasp the WiFi adapter card that is installed and gently pull it out of the slot. Figure 50. Removing the WiFi adapter card Note: The card fits tightly into the card slot. If necessary, alternate moving each side of the card a small amount until it is removed from the card slot. Removing the WiFi card module To remove the WiFi card module, do the following: Chapter 5. Installing or replacing hardware 67 1. Remove the WiFi adapter card from the computer, and then disconnect the front and rear WiFi antenna cables from the WiFi card module. Figure 51. Removing the WiFi antenna cables 2. Remove the two screws that secure the WiFi card module to the WiFi adapter card. Figure 52. Removing the screws that secure the WiFi card module 68 ThinkCentre E73 User Guide


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