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Safety and warranty

The

ThinkCentre Safety and Warranty Guide

that came with your computer contains information about

safety, warranty, service and support phone numbers, CRUs, and other notices and information resources.
You can also get the latest service and support telephone numbers and a PDF version of the

ThinkCentre

Safety and Warranty Guide

from the Lenovo Support Web site at:

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Before using the information in this manual and the product it supports, be sure to read and understand the

ThinkCentre Safety and Warranty Guide

and Appendix A “Notices” on page 71.

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Help and service

This section provides information about obtaining help and service.

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Содержание ThinkCentre 7539

Страница 1: ...ThinkCentre User Guide Machine Types 0104 0154 7539 and 7548 ...

Страница 2: ......

Страница 3: ...ThinkCentre User Guide Machine Types 0104 0154 7539 and 7548 ...

Страница 4: ...services have been developed exclusively at private expense and are sold to governmental entities as commercial items as defined by 48 C F R 2 101with limited and restricted rights to use reproduction and disclosure LIMITED AND RESTRICTED RIGHTS NOTICE If products data computer software or services are delivered pursuant a General Services Administration GSA contract use reproduction or disclosure...

Страница 5: ...protection 46 Erasing a lost or forgotten password clearing CMOS 46 Chapter 3 Recovery information 49 Creating and using recovery media 49 Creating recovery media 49 Using recovery media 50 Performing backup and recovery operations 50 Performing a backup operation 50 Performing a recovery operation 51 Using the Rescue and Recovery workspace 51 Creating and using a rescue medium 52 Creating a rescu...

Страница 6: ...nty 68 Lenovo Web site http www lenovo com 68 Help and service 68 Using the documentation and diagnostic programs 69 Calling for service 69 Using other services 70 Purchasing additional services 70 Appendix A Notices 71 Television output notice 72 European conformance CE mark 72 Trademarks 72 Index 73 iv ThinkCentre User Guide ...

Страница 7: ...at you received with this product for the latest safety information Reading and understanding this safety information reduces the risk of personal injury and or damage to your product If you no longer have a copy of the ThinkCentre Safety and Warranty Guide you can obtain a Portable Document Format PDF version from the Lenovo Support Web site at http www lenovo com support Copyright Lenovo 2010 v ...

Страница 8: ...vi ThinkCentre User Guide ...

Страница 9: ...nformation covers a variety of models For information about your specific model use the Setup Utility program See Chapter 4 Using the Setup Utility program on page 55 Microprocessor Your computer comes with one of the following microprocessors internal cache size varies by model type Intel Core i3 microprocessor Intel Core i5 microprocessor Intel Core i7 microprocessor Intel Pentium microprocessor...

Страница 10: ...ystems Input Output I O features 9 pin serial port one standard and one optional One DVI monitor connector One Ethernet connector One parallel port available in some models One Personal System 2 PS 2 keyboard connector One PS 2 mouse connector One VGA monitor connector Six Universal Serial Bus USB 2 0 connectors two on the front panel and four on the rear panel Three audio connectors on the rear p...

Страница 11: ... software programs Your computer is preinstalled with some software programs to help you work more easily and securely For more information see Software overview on page 4 Preinstalled operating system Your computer is preinstalled with the Microsoft Windows 7 operating system Operating system s certified or tested for compatibility1 varies by model type Linux Specifications This section lists the...

Страница 12: ... range 50 to 60 Hz Voltage selection switch setting 115 V ac High range Minimum 200 V ac Maximum 240 V ac Input frequency range 50 to 60 Hz Voltage selection switch setting 230 V ac Software overview The computer comes with a preinstalled operating system and several software programs provided by Lenovo Software provided with your Windows operating system This section provides information about th...

Страница 13: ...rd Manager The Password Manager program automatically captures and fills in authentication information for Windows applications and Web sites Note If the Password Vault icon in the Lenovo ThinkVantage Tools program is dimmed it indicates that you need to install the Password Manager program manually before enabling its features To install the Password Manager program do the following 1 Click Start...

Страница 14: ... to 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 For more information about how to use your antivirus software refer to the help system of your antivirus software Locations This section provides information to help you l...

Страница 15: ...e connectors on the rear of your computer are color coded to help you determine where to connect the cables on your computer Figure 2 Rear connector and part locations 1 Power cord connector 8 Audio line out connector 2 PS 2 mouse connector 9 Audio line in connector 3 PS 2 keyboard connector 10 PCI Express x16 graphics card slot 4 DVI monitor connector 11 PCI Express x1 card slot 5 VGA monitor con...

Страница 16: ...d or if you use speech recognition software Parallel port Use this port to attach a parallel printer or other devices that use a 25 pin parallel port PS 2 keyboard connector Used to attach a keyboard that uses a PS 2 keyboard connector PS 2 mouse connector Used to attach a mouse a trackball or other pointing devices that use a PS 2 mouse connector Serial port Used to attach an external modem a ser...

Страница 17: ...ry modules 2 8 Hard disk drive 4 Optical drive available in some models 9 PCI card available in some models 5 Front USB and audio assembly 10 Heat sink fan duct Locating parts on the system board Figure 4 System board part locations on page 10 shows the locations of the parts on the system board Chapter 1 Product overview 9 ...

Страница 18: ...onnector 10 Front USB connectors 2 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 dr...

Страница 19: ...the locations of the drive bays in your computer Figure 5 Drive bay locations 1 Bay 1 Optical drive bay with an optical drive installed in some models 2 Bay 2 Slim card reader drive bay 3 Bay 3 SATA hard disk drive bay Chapter 1 Product overview 11 ...

Страница 20: ...12 ThinkCentre User Guide ...

Страница 21: ...uter for at least two seconds This reduces static electricity from the package and your body Remove the new part from the static protective package and directly install it in the computer without placing it on any other surface If it is hard for you to do this in your specific situation place the static protective package of the new part on a smooth level surface and then place the new part on the...

Страница 22: ... computer cover CAUTION Turn off the computer and wait three to five minutes to let the computer cool before removing the computer cover To remove the computer cover do the following 1 Remove all media from the drives Then turn off all attached devices and the computer 2 Disconnect all power cords from electrical outlets 3 Disconnect the power cord Input Output I O cables and all other cables that...

Страница 23: ...bezel 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 14 3 Remove the front bezel by releasing the three plastic tabs on the top of the front bezel and pivoting...

Страница 24: ... Guide that came with your computer To obtain a copy of the ThinkCentre Safety and Warranty Guide go to http www lenovo com support 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 Remove all media from the drives and turn off all attached devices and the computer Then disconnect all power...

Страница 25: ...bay assembly downward as shown Figure 10 Lowering the drive bay assembly Installing or replacing a PCI card Attention Do not open your computer or attempt any repair before reading and understanding the Important safety information in the ThinkCentre Safety and Warranty Guide that came with your computer To obtain a copy of the ThinkCentre Safety and Warranty Guide go to http www lenovo com suppor...

Страница 26: ...old PCI card from the PCI card slot Then carefully remove the old PCI card from the chassis as shown in Figure 11 Removing the PCI card on page 19 Notes a If there are any cables between the PCI card and the system board note the cable routing and then disconnect the cables b If the PCI card is secured in place by a retaining latch 1 press the retaining latch to release the PCI card from the latch...

Страница 27: ...ng a PCI card remove the appropriate PCI card slot cover See Locating parts on the system board on page 9 to identify the types of PCI card slots 4 Remove the new PCI card from its static protective package Chapter 2 Installing or replacing hardware 19 ...

Страница 28: ...mation in the ThinkCentre Safety and Warranty Guide that came with your computer To obtain a copy of the ThinkCentre Safety and Warranty Guide go to http www lenovo com support This section provides instructions on how to install or replace a memory module Your computer has four memory slots for installing or replacing DDR3 SDRAM DIMMs that provide up to a maximum of 16 GB of system memory When in...

Страница 29: ... to the memory slots 6 Do one of the following If you are replacing a memory module open the retaining clips and remove the old memory module that is currently installed Figure 13 Removing the memory module 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 14 Opening the retaining clips of the memory slot Chapt...

Страница 30: ...that maintains the date time and configuration information for built in features The battery keeps this information active when you turn off the computer 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 tur...

Страница 31: ... might be displayed This is normal after replacing the battery 12 Use the Setup Utility program to set the date time passwords and any other configuration information See Chapter 4 Using the Setup Utility program on page 55 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 43 Replacing the...

Страница 32: ...ables that are connected to the computer 2 Remove the computer cover See Removing the computer cover on page 14 3 Remove the front bezel See Removing and reinstalling the front bezel on page 15 4 Pivot the drive bay assembly upward Remove the four screws that secure the heat sink fan duct and then lift the heat sink fan duct up to remove it from the chassis Figure 18 Removing the heat sink fan duc...

Страница 33: ... 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 Make sure that you properly place the new heat sink and fan assembly so that you can easily connect the new heat sink and fan assembly cable to the microprocessor fan connector on the system board...

Страница 34: ...efore reading and understanding the Important safety information in the ThinkCentre Safety and Warranty Guide that came with your computer To obtain a copy of the ThinkCentre Safety and Warranty Guide go to http www lenovo com support This section provides instructions on how to replace the microprocessor CAUTION The heat sink and microprocessor might be very hot Turn off the computer and wait thr...

Страница 35: ...r socket as shown in Figure 22 Removing the microprocessor on page 28 Notes a Your microprocessor and socket might look different from the one illustrated 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 ...

Страница 36: ...arts and reconnect any cables that have been removed or disconnected 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 43 Replacing the power supply assembly Attention Do not open your computer or attempt any repair before reading and understanding the Important safety information in the T...

Страница 37: ... To replace the power supply assembly 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 14 3 Remove the front bezel See Removing and reinstalling the front bezel ...

Страница 38: ...he power supply assembly out of the computer Figure 24 Removing the power supply assembly 7 Make sure that the new power supply assembly is the correct replacement Some power supply assemblies automatically sense the voltage or accept universal input some power supply assemblies are voltage specific and some power supply assemblies have a voltage selection switch If your power supply assembly has ...

Страница 39: ... 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 Figure 25 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 9 Chapter 2 Installing or replacing hardware 31 ...

Страница 40: ...anding the Important safety information in the ThinkCentre Safety and Warranty Guide that came with your computer To obtain a copy of the ThinkCentre Safety and Warranty Guide go to http www lenovo com support This section provides instructions on how to replace the optical drive To replace the optical drive do the following 1 Remove all media from the drives and turn off all attached devices and ...

Страница 41: ...l drive and remove the two screws that secure the optical drive Figure 27 Removing the optical drive screws 7 Press the drive bay assembly clip 1 inward and pivot the drive bay assembly downward as shown Figure 28 Lowering the drive bay assembly Chapter 2 Installing or replacing hardware 33 ...

Страница 42: ...e out of the front of the computer Figure 29 Removing the optical drive 9 Slide the new optical drive into the optical drive bay from the front of the computer Figure 30 Installing a new optical drive 34 ThinkCentre User Guide ...

Страница 43: ...locate an available five wire power connector and connect it to the rear of the new optical drive Figure 32 Connecting a SATA optical drive 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 43 Replacing the hard disk drive Attention Do not open your computer or attempt any repair before re...

Страница 44: ...ower 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 14 3 Remove the front bezel See Removing and reinstalling the front bezel on page 15 4 Note the location of the four screws 1 that secure the hard disk drive Then pivot the drive bay assembly upward Figure 33 Pivoting the drive bay asse...

Страница 45: ...move it from the chassis Figure 34 Removing the hard disk drive 6 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 9 Then locate an available five wire power connector and connect it to the rear of the new hard disk drive Figure 35 Connecting a SATA hard dis...

Страница 46: ...d Warranty Guide that came with your computer To obtain a copy of the ThinkCentre Safety and Warranty Guide go to http www lenovo com support This section provides instructions on how to replace the card reader Note The card reader is available only in some models To replace the card reader do the following 1 Remove all media from the drives and turn off all attached devices and the computer Then ...

Страница 47: ... new card reader cable to the USB connector on the system board See Locating parts on the system board on page 9 12 Properly route the cable of the new card reader and then secure the cable with the cable clip on 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...

Страница 48: ...6 5 Remove the hard disk drive for easier access to the front fan assembly See Replacing the hard disk drive on page 35 6 Remove the heat sink fan duct See Replacing the power supply assembly on page 28 7 Note the cable routing and disconnect the front fan assembly cable from the system fan connector on the system board See Locating parts on the system board on page 9 8 The front fan assembly is a...

Страница 49: ...nk fan duct See Figure 26 Installing the heat sink fan duct on page 32 12 Reinstall the hard disk drive See Replacing the hard disk drive on page 35 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 43 Replacing the keyboard Attention Do not open your computer or attempt any repair before ...

Страница 50: ...Keyboard connectors 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 43 Replacing the mouse Attention Do not open your computer or attempt any repair before reading and understanding the Important safety information in the ThinkCentre Safety and Warranty Guide that came with your computer...

Страница 51: ...parts you need to reinstall the computer cover and reconnect cables To reinstall the computer cover and reconnect cables to your computer do the following 1 Make sure that all components have been reassembled correctly and that no tools or loose screws are left inside your computer See Locating components on page 8 for the locations of the various components in your computer 2 Make sure that all t...

Страница 52: ...ou installed or replaced you might need to confirm the updated information in the Setup Utility program See Chapter 4 Using the Setup Utility program on page 55 Note In most areas of the world Lenovo requires the return of the defective Customer Replaceable Units CRUs Information about this will come with the new CRUs or will come a few days after you receive the new CRUs Obtaining device drivers ...

Страница 53: ...he cable lock also locks the computer cover See Figure 43 Installing an integrated cable lock on page 45 This is the same type of lock used with many notebook computers You can order an integrated cable lock from Lenovo by searching for Kensington at http www lenovo com support Note Make sure that the integrated cable lock you installed does not interfere with other computer cables Figure 43 Insta...

Страница 54: ... forgotten password clearing CMOS This section provides instructions on how to erase a lost or forgotten password such as a user password To erase a lost or forgotten password 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 Re...

Страница 55: ...computer by holding the power switch for approximately five seconds 9 Repeat step 1 through step 4 10 Move the Clear CMOS Recovery jumper back to the standard position pin 1 and pin 2 11 Reinstall any parts and reconnect any cables that have been removed or disconnected 12 Reinstall the computer cover and reconnect all cables See Completing the parts replacement on page 43 13 Turn on the computer ...

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Страница 57: ...n the event of a software or hardware related problem Some methods vary depending on the type of your operating system 3 The product on the recovery media may be used only for the following purposes Restore the product preinstalled on your computer Reinstall the product Modify the product using the Additional Files Creating and using recovery media You can use recovery media to restore the hard di...

Страница 58: ...ight have to reinstall device drivers for some devices See Installing or reinstalling device drivers on page 53 2 Some computers come with Microsoft Office or Microsoft Works preinstalled If you need to recover or reinstall your Microsoft Office or Microsoft Works applications you must use the Microsoft Office CD or Microsoft Works CD These discs are provided only with computers preinstalled with ...

Страница 59: ...ce enables you to locate files on your hard disk drive and transfer them to a network drive or other recordable media such as a USB device or a disc This solution is available even if you did not back up your files or if changes were made to the files since your last backup operation You can also rescue individual files from a Rescue and Recovery backup located on your local hard disk drive a USB ...

Страница 60: ...oft Office or Microsoft Works Creating and using a rescue medium With a rescue medium such as a disc or a USB hard disk drive you can recover the computer from failures that prevent you from gaining access to the Rescue and Recovery workspace on your hard disk drive Notes 1 The recovery operations you can perform using a rescue medium vary depending on the operating system 2 The rescue disc can be...

Страница 61: ...lled devices are also available at http www lenovo com support Other device drivers are on the software media that come with individual devices To install or reinstall the device driver for a factory installed device do the following 1 Turn on the computer 2 Use Windows Explorer or My Computer to display the directory structure of your hard disk drive 3 Go to the C SWTOOLS directory 4 Open the DRI...

Страница 62: ...external devices set as the first boot device in the startup device sequence You must first make sure that your rescue device is set as the first boot device in the startup device sequence in the Setup Utility program See Selecting a startup device on page 57 for detailed information about temporarily or permanently changing the startup device sequence For more information about the Setup Utility ...

Страница 63: ...r see a logo screen release the F1 key The Setup Utility program opens Note If a password has been set the Setup Utility program menu will not be displayed until you type the correct password For more information see Using passwords on page 55 Viewing or changing settings The Setup Utility program menu lists various items about the system configuration settings To view or change the settings start...

Страница 64: ...of several computers you might want to set an administrator password For more information about how to set a password see Setting changing or deleting a password on page 56 After you have set an administrator password a password prompt is displayed each time you try to access the Setup Utility program You cannot access the Setup Utility program until a valid password is typed in If you have set bo...

Страница 65: ...turn to the default settings press F9 or select Exit Load Optimal Defaults Selecting a startup device If your computer does not start up from a device such as a hard disk drive or the disc in an optical drive as expected do one of the following to select the desired startup device Selecting a temporary startup device This section provides instructions on how to select a temporary startup device Yo...

Страница 66: ...ave the new settings select Exit Discard Changes and Exit b If you want to return to the default settings press F9 or select Exit Load Optimal Defaults Exiting the Setup Utility program After you finish viewing or changing settings press Esc to return to the Setup Utility program main menu You might have to press Esc several times Then you can do one of the following If you want to save the new se...

Страница 67: ...ystem program update disc or running a special update program from your operating system Lenovo might make changes and enhancements to the POST and BIOS When updates are released they are available as downloadable files on the Lenovo Web site at http www lenovo com Instructions for using the POST and BIOS updates are available in a TXT file that is included with the update files For most models yo...

Страница 68: ...a POST and BIOS update failure If the power to your computer is interrupted while the POST and BIOS is being updated your computer might not restart correctly If this happens perform the following procedure which is commonly called Boot block Recovery 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 di...

Страница 69: ...removed or disconnected 13 Reinstall the computer cover and reconnect power cords and all other external cables See Completing the parts replacement on page 43 14 Turn on the computer and remove the disc from the optical drive Chapter 5 Updating system programs 61 ...

Страница 70: ...62 ThinkCentre User Guide ...

Страница 71: ...enovo com support Symptom Action The computer does not start when you press the power switch Verify that The power cord is correctly connected to the rear of the computer and to a working electrical outlet The power indicator on the front of the computer is on The computer voltage matches the voltage available at the electrical outlet for your country or region The monitor screen is blank Verify t...

Страница 72: ...the log files created by the programs You will need the log files when you speak to a Lenovo technical support representative Lenovo ThinkVantage Toolbox The Lenovo ThinkVantage Toolbox program helps you maintain your computer improve computing security diagnose computer problems get familiar with the innovative technologies provided by Lenovo and get more information about your computer You can u...

Страница 73: ...d diagnostic test For additional help press the F1 key 6 Remove the diagnostic disc from the optical drive after completing the diagnostic test Cleaning an optical mouse This section provides instructions on how to clean an optical mouse An optical mouse uses a light emitting diode and an optical sensor to navigate the pointer If the pointer on the screen does not move smoothly with the optical mo...

Страница 74: ...66 ThinkCentre User Guide ...

Страница 75: ... Notes 1 The publication is in PDF version To view the publication you need to have the Adobe Reader program preinstalled on your computer If the Adobe Reader program has not been installed on your computer a message will be displayed when you attempt to view the PDF file and you will be guided through the Adobe Reader installation 2 The publication is available in other languages on the Lenovo Su...

Страница 76: ...fety and Warranty Guide from the Lenovo Support Web site at http www lenovo com support Before using the information in this manual and the product it supports be sure to read and understand the ThinkCentre Safety and Warranty Guide and Appendix A Notices on page 71 Lenovo Web site http www lenovo com The Lenovo Web site provides up to date information and services to help you buy upgrade and main...

Страница 77: ...e management There might be changes that are required after a product has been sold Lenovo or your reseller will make selected Engineering Changes ECs that apply to your hardware available The following items are not covered by the warranty Replacement or use of parts not manufactured for or by Lenovo or non warranted Lenovo parts Identification of software problem sources Configuration of the BIO...

Страница 78: ...To determine whether your computer is eligible for International Warranty Service and to view a list of the countries where service is available go to http www lenovo com support click Warranty and follow the instructions on the screen For technical assistance with the installation of or questions related to Service Packs for your preinstalled Microsoft Windows product refer to the Microsoft Produ...

Страница 79: ...e publication Lenovo may make improvements and or changes in the product s and or the program s described in this publication at any time without notice The products described in this document are not intended for use in implantation or other life support applications where malfunction may result in injury or death to persons The information contained in this document does not affect or change Len...

Страница 80: ...g uses only unless otherwise authorized by Macrovision Corporation Reverse engineering or disassembly is prohibited European conformance CE mark Trademarks Lenovo the Lenovo logo Rescue and Recovery ThinkCentre and ThinkVantage are trademarks of Lenovo in the United States other countries or both Microsoft and Windows are trademarks of the Microsoft group of companies Intel Intel Core and Pentium ...

Страница 81: ...ting the replacement 43 D device drivers 44 installing 53 reinstalling 53 devices handling static sensitive 13 diagnostic programs troubleshooting 63 diagnostic programs using 69 documentation using 69 drivers device 44 drives internal 10 DVI monitor connector 8 E environment operating 4 Ethernet 2 Ethernet connector 8 exiting Setup Utility program 58 expansion 2 external options installing 13 F f...

Страница 82: ... replacing 17 slots 18 physical specifications 3 power supply features 3 power supply assembly replacing 28 power on password 56 power on self test POST 59 programs updating system 59 protection password 46 PS 2 keyboard connector 8 PS 2 mouse connector 8 purchasing additional services 70 R rear connectors 7 recovering from a POST and BIOS update failure 60 software 49 recovery Boot block Recovery...

Страница 83: ...devices handling 13 system management 2 programs 59 system board locating parts 9 location 9 system board components and drives accessing 16 T television output notice 72 temporary startup device 57 the BIOS updating flashing 59 60 trademarks 72 troubleshooting basic 63 troubleshooting diagnostic programs 63 U updating flashing the BIOS 59 system programs 59 updating flashing the BIOS 60 USB conne...

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Страница 86: ...Part Number 0A22638 Printed in USA 1P P N 0A22638 0A22638 ...

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