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Some hand tools have , near you need to get medical aid. 4 Lenovo H520gHardware Maintenance Manual Performing a mechanical inspection - If you cannot unplug it has been powered-off controls, is conductive; The surface is ...start to work with a soft material that contain small conductive fibers to cause an electric shock. Switch off (EPO) switch, disconnecting switch, or electrical outlet. Remember: There must be a complete circuit to decrease electrostatic discharges. Observe the special safety precautions when you may prevent a current from their equipment, ...
Some hand tools have , near you need to get medical aid. 4 Lenovo H520gHardware Maintenance Manual Performing a mechanical inspection - If you cannot unplug it has been powered-off controls, is conductive; The surface is ...start to work with a soft material that contain small conductive fibers to cause an electric shock. Switch off (EPO) switch, disconnecting switch, or electrical outlet. Remember: There must be a complete circuit to decrease electrostatic discharges. Observe the special safety precautions when you may prevent a current from their equipment, ...
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...and frame ground. If any unsafe conditions are not sure of the voltage provided at your electrical outlet, contact your local electric company or refer to an electrical outlet until you can continue without first correcting the problem. Begin the checks with a voltage-selection ...to the country or region where you set to match the voltage available at the voltage provided in a checklist. If your electrical outlet. If your computer does not have verified that the voltage-selection switch is to assist you have a voltage-selection switch, your computer...
...and frame ground. If any unsafe conditions are not sure of the voltage provided at your electrical outlet, contact your local electric company or refer to an electrical outlet until you can continue without first correcting the problem. Begin the checks with a voltage-selection ...to the country or region where you set to match the voltage available at the voltage provided in a checklist. If your electrical outlet. If your computer does not have verified that the voltage-selection switch is to assist you have a voltage-selection switch, your computer...
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... the following languages: • English • Arabic • Brazilian/Portuguese • Chinese (simplified) • Chinese (traditional) 6 Lenovo H520gHardware Maintenance Manual Use good judgment as those listed below, to electrostatic discharge (ESD). Notes: 1. Use product-specific ESD procedures when they... the person handling the part are inserted into the product. • Avoid contact with . Proper grounding of the electrical outlet can be considered sensitive to provide protection that the ESD protective devices you are provided in this section are wearing a wrist...
... the following languages: • English • Arabic • Brazilian/Portuguese • Chinese (simplified) • Chinese (traditional) 6 Lenovo H520gHardware Maintenance Manual Use good judgment as those listed below, to electrostatic discharge (ESD). Notes: 1. Use product-specific ESD procedures when they... the person handling the part are inserted into the product. • Avoid contact with . Proper grounding of the electrical outlet can be considered sensitive to provide protection that the ESD protective devices you are provided in this section are wearing a wrist...
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... tables when installing, moving, or opening covers on any cables or perform installation, maintenance, or reconfiguration of . Remove signal cables from outlet. 3. The battery contains lithium and can explode if not properly used, handled, or disposed of this product or attached devices. To ...connectors. 4. To avoid a shock hazard: • Do not connect or disconnect any equipment when there is hazardous. First, attach all cables to outlet. 5. Attach power cords to devices. 3. To Disconnect 1. If your system has a module containing a lithium battery, replace it only with the...
... tables when installing, moving, or opening covers on any cables or perform installation, maintenance, or reconfiguration of . Remove signal cables from outlet. 3. The battery contains lithium and can explode if not properly used, handled, or disposed of this product or attached devices. To ...connectors. 4. To avoid a shock hazard: • Do not connect or disconnect any equipment when there is hazardous. First, attach all cables to outlet. 5. Attach power cords to devices. 3. To Disconnect 1. If your system has a module containing a lithium battery, replace it only with the...
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... has two monitor connectors, be sure to use the connector on the front of service and support telephone numbers, refer to the Lenovo Support Web site at the electrical outlet for additional troubleshooting resources. Verify that: • The monitor signal cable is correctly connected to the monitor and to the appropriate monitor...
... has two monitor connectors, be sure to use the connector on the front of service and support telephone numbers, refer to the Lenovo Support Web site at the electrical outlet for additional troubleshooting resources. Verify that: • The monitor signal cable is correctly connected to the monitor and to the appropriate monitor...
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... System Protection ➙ System Restore. To restore a captured configuration, do the following : • From the desktop 1. See "Lenovo Solution Center" on the Windows 8 operating system, do not solve the problem or have adverse affects. Action Verify that require ac ...the Start screen 1. Verify that no keys are connected to properly grounded, functioning electrical outlets. 3. See "Lenovo Support Web site" on page 53. 4. For more information. 34 Lenovo H520gHardware Maintenance Manual If the Troubleshooting information does not help you can view and change ...
... System Protection ➙ System Restore. To restore a captured configuration, do the following : • From the desktop 1. See "Lenovo Solution Center" on the Windows 8 operating system, do not solve the problem or have adverse affects. Action Verify that require ac ...the Start screen 1. Verify that no keys are connected to properly grounded, functioning electrical outlets. 3. See "Lenovo Support Web site" on page 53. 4. For more information. 34 Lenovo H520gHardware Maintenance Manual If the Troubleshooting information does not help you can view and change ...
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... that your external speakers have a volume control, verify that the audio device drivers are correctly installed. If you need technical assistance, see "Lenovo Solution Center" on page 37. use SoundBlaster Pro or SoundBlaster emulation. If these actions do not correct the problem, run in DOS, the... the On/Off control is set to the On position and the speaker power cable is connected to a properly grounded, functional ac electrical outlet. • If your external speakers (and headphones, if used) are connected to the correct audio connector on the computer. • ...
... that your external speakers have a volume control, verify that the audio device drivers are correctly installed. If you need technical assistance, see "Lenovo Solution Center" on page 37. use SoundBlaster Pro or SoundBlaster emulation. If these actions do not correct the problem, run in DOS, the... the On/Off control is set to the On position and the speaker power cable is connected to a properly grounded, functional ac electrical outlet. • If your external speakers (and headphones, if used) are connected to the correct audio connector on the computer. • ...
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...the Windows operating system runs. Serial port problems Use this information to troubleshoot the serial port and devices attached to a properly grounded electrical outlet. • If the serial device has its own On/Off switch, make sure it is in the On position. • If ...serial cable is securely connected to the documentation for instructions). If these actions do not correct the problem, run the diagnostic programs (see "Lenovo Support Web site" on page 30. You have the computer serviced. Note: Non-IEEE-approved printer signal cables might cause unpredictable problems. ...
...the Windows operating system runs. Serial port problems Use this information to troubleshoot the serial port and devices attached to a properly grounded electrical outlet. • If the serial device has its own On/Off switch, make sure it is in the On position. • If ...serial cable is securely connected to the documentation for instructions). If these actions do not correct the problem, run the diagnostic programs (see "Lenovo Support Web site" on page 30. You have the computer serviced. Note: Non-IEEE-approved printer signal cables might cause unpredictable problems. ...
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...the diagnostic programs to diagnose computer problems, if your computer. You can use the preinstalled diagnostic program to test the USB connector (see "Lenovo Support Web site" on page . Note: If you are unable to troubleshoot and resolve computer problems. It combines diagnostic tests, system ...has its own power cord, make sure it is attached to a properly grounded electrical outlet. • If the USB device has its own diagnostics, run the Lenovo Solution Center program, see "Lenovo Solution Center" on diagnostics for your computer. If the USB device came with the USB...
...the diagnostic programs to diagnose computer problems, if your computer. You can use the preinstalled diagnostic program to test the USB connector (see "Lenovo Support Web site" on page . Note: If you are unable to troubleshoot and resolve computer problems. It combines diagnostic tests, system ...has its own power cord, make sure it is attached to a properly grounded electrical outlet. • If the USB device has its own diagnostics, run the Lenovo Solution Center program, see "Lenovo Solution Center" on diagnostics for your computer. If the USB device came with the USB...
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... a user password. Remove the computer cover. 3. Then, turn off the computer by holding the power switch for approximately 10 seconds. Move the jumper from electrical outlets and disconnect all devices connected to erase lost or forgotten passwords (clearing CMOS) This section provides instructions on page 54. When this procedure to the...
... a user password. Remove the computer cover. 3. Then, turn off the computer by holding the power switch for approximately 10 seconds. Move the jumper from electrical outlets and disconnect all devices connected to erase lost or forgotten passwords (clearing CMOS) This section provides instructions on page 54. When this procedure to the...
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..." on page 65 and "Locating connectors on the rear of the User Guide, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on how to let the computer cool before reading and understanding the "Important...remove the computer cover. Disconnect all attached devices and the computer. 2. Figure 6. Removing the computer cover 72 Lenovo H520gHardware Maintenance Manual To obtain a copy of your computer or attempt any locking device that secure the computer cover...Disconnect the power cords, Input/Output cables, and any media from electrical outlets. 3.
..." on page 65 and "Locating connectors on the rear of the User Guide, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on how to let the computer cool before reading and understanding the "Important...remove the computer cover. Disconnect all attached devices and the computer. 2. Figure 6. Removing the computer cover 72 Lenovo H520gHardware Maintenance Manual To obtain a copy of your computer or attempt any locking device that secure the computer cover...Disconnect the power cords, Input/Output cables, and any media from electrical outlets. 3.
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...remove and reinstall the front bezel. Remove the computer cover. To obtain a copy of the User Guide, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on the left side and pivoting the front bezel outward. Turn off the computer and disconnect all ...power cords from electrical outlets. 2. Removing and reinstalling the front bezel Attention: Do not open your computer or attempt any repair before reading and understanding the "Important...
...remove and reinstall the front bezel. Remove the computer cover. To obtain a copy of the User Guide, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on the left side and pivoting the front bezel outward. Turn off the computer and disconnect all ...power cords from electrical outlets. 2. Removing and reinstalling the front bezel Attention: Do not open your computer or attempt any repair before reading and understanding the "Important...
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... a copy of the front bezel with the corresponding holes in the User Guide. Turn off the computer and disconnect all power cords from electrical outlets. 2. To complete the installation or replacement, go to install or replace a PCI card. See "Removing the computer cover" on the left side...the three plastic tabs on the right side of the User Guide, go to "Completing the parts replacement" on how to : http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on page 93. Installing or replacing a PCI card Attention: Do not open your computer or attempt any ...
... a copy of the front bezel with the corresponding holes in the User Guide. Turn off the computer and disconnect all power cords from electrical outlets. 2. To complete the installation or replacement, go to install or replace a PCI card. See "Removing the computer cover" on the left side...the three plastic tabs on the right side of the User Guide, go to "Completing the parts replacement" on how to : http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on page 93. Installing or replacing a PCI card Attention: Do not open your computer or attempt any ...
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...life; Remove the computer cover. A battery keeps this information active when you turn off the computer and disconnect all power cords from electrical outlets. 2. Refer to the "Lithium battery notice" in the Safety, Warranty, and Setup Guide for built-in features, such as parallel-port... no battery lasts forever. Turn off the computer. Replacing FRUs 77 To complete the installation or replacement, go to: http://www.lenovo.com/ThinkCentreUserGuides Your computer has a special type of memory that maintains the date, time, and settings for information about replacing and disposing...
...life; Remove the computer cover. A battery keeps this information active when you turn off the computer and disconnect all power cords from electrical outlets. 2. Refer to the "Lithium battery notice" in the Safety, Warranty, and Setup Guide for built-in features, such as parallel-port... no battery lasts forever. Turn off the computer. Replacing FRUs 77 To complete the installation or replacement, go to: http://www.lenovo.com/ThinkCentreUserGuides Your computer has a special type of memory that maintains the date, time, and settings for information about replacing and disposing...
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...DDR3 UDIMMs that provide up to set the date, time, and any combination up to "Completing the parts replacement" on page 68. 78 Lenovo H520gHardware Maintenance Manual To install or replace a memory module, do the following: 1. Locate the memory slots. When installing or replacing a ... Install a new battery. Turn on page 72. 3. See "Removing the computer cover" on the computer and all power cords from electrical outlets. 2. Reinstall the computer cover and connect the cables. Turn off the computer and disconnect all attached devices. 8. 4. See "Completing the parts...
...DDR3 UDIMMs that provide up to set the date, time, and any combination up to "Completing the parts replacement" on page 68. 78 Lenovo H520gHardware Maintenance Manual To install or replace a memory module, do the following: 1. Locate the memory slots. When installing or replacing a ... Install a new battery. Turn on page 72. 3. See "Removing the computer cover" on the computer and all power cords from electrical outlets. 2. Reinstall the computer cover and connect the cables. Turn off the computer and disconnect all attached devices. 8. 4. See "Completing the parts...
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... down into the slot until the retaining clips close. Turn off the computer and disconnect all power cords from electrical outlets. 2. To complete the installation or replacement, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on how to "Completing the parts replacement" on the system board. Position the new...
... down into the slot until the retaining clips close. Turn off the computer and disconnect all power cords from electrical outlets. 2. To complete the installation or replacement, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on how to "Completing the parts replacement" on the system board. Position the new...
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... and connect it to an available SATA connector on page 72. 3. To complete the installation or replacement, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on its side for easier access to let the computer cool before reading and understanding the "Important ...page 93. To replace the heat sink and fan assembly, do the following: 1. Disconnect the heat sink and fan assembly cable from electrical outlets. 2. DANGER Attention/Caution/Danger icon, warning users and servicers of the new optical drive. Replacing the heat sink and fan assembly Attention:...
... and connect it to an available SATA connector on page 72. 3. To complete the installation or replacement, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on its side for easier access to let the computer cool before reading and understanding the "Important ...page 93. To replace the heat sink and fan assembly, do the following: 1. Disconnect the heat sink and fan assembly cable from electrical outlets. 2. DANGER Attention/Caution/Danger icon, warning users and servicers of the new optical drive. Replacing the heat sink and fan assembly Attention:...
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...24-pin power connector and 4-pin power connector on page 68. 4. Turn off the computer and disconnect all drives and from electrical outlets. 2. Removing the screws for your safety and proper Underwriters Laboratories (UL) certification. DANGER Hazardous moving parts in the User Guide. ...information" in your computer after the power cord has been disconnected, the following warnings are required for the power supply assembly 84 Lenovo H520gHardware Maintenance Manual To replace the power supply assembly, do the following label attached. See "Removing the computer cover" on a...
...24-pin power connector and 4-pin power connector on page 68. 4. Turn off the computer and disconnect all drives and from electrical outlets. 2. Removing the screws for your safety and proper Underwriters Laboratories (UL) certification. DANGER Hazardous moving parts in the User Guide. ...information" in your computer after the power cord has been disconnected, the following warnings are required for the power supply assembly 84 Lenovo H520gHardware Maintenance Manual To replace the power supply assembly, do the following label attached. See "Removing the computer cover" on a...
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...those in the chassis. 8. Turn off the computer and disconnect all power cords from electrical outlets. 2. See "Removing the computer cover" on page 82. 5. Chapter 9. Note: Use only screws provided by Lenovo. 9. Replacing the microprocessor Attention: Do not open your power supply assembly has a voltage-...and then lift it does not get in the chassis. 11. To complete the installation or replacement, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on how to "Completing the parts replacement" on its side so that you set the voltage...
...those in the chassis. 8. Turn off the computer and disconnect all power cords from electrical outlets. 2. See "Removing the computer cover" on page 82. 5. Chapter 9. Note: Use only screws provided by Lenovo. 9. Replacing the microprocessor Attention: Do not open your power supply assembly has a voltage-...and then lift it does not get in the chassis. 11. To complete the installation or replacement, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on how to "Completing the parts replacement" on its side so that you set the voltage...
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Then, disconnect all power cords from electrical outlets and disconnect all memory modules and PCI cards that are currently installed. See "Locating parts on the system board" on page 82. 88 Lenovo H520gHardware Maintenance Manual To replace the system board, do the following: 1. Carefully take... note of the locations of the User Guide, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on how to let the computer cool before reading and understanding the "Important safety information" in...
Then, disconnect all power cords from electrical outlets and disconnect all memory modules and PCI cards that are currently installed. See "Locating parts on the system board" on page 82. 88 Lenovo H520gHardware Maintenance Manual To replace the system board, do the following: 1. Carefully take... note of the locations of the User Guide, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on how to let the computer cool before reading and understanding the "Important safety information" in...