Lenovo 90GS, Hardware Maintenance Manual

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Contents
Chapter 1. About this manual . . . . . 1
Important Safety Information . . . . . . . . . 1
Chapter 2. Safety information . . . . . 3
General safety . . . . . . . . . . . . . . . 3
Electrical safety . . . . . . . . . . . . . . 3
Safety inspection guide . . . . . . . . . . . 5
Handling electrostatic discharge-sensitive
devices
. . . . . . . . . . . . . . . . . 5
Grounding requirements . . . . . . . . . . . 6
Safety notices . . . . . . . . . . . . . . . 6
Chapter 3. General information . . . . 9
Specifications . . . . . . . . . . . . . . . 9
Chapter 4. General Checkout . . . . . 11
Chapter 5. Using the Setup Utility. . . 13
Starting the Lenovo BIOS Setup Utility program . 13
Viewing and changing settings . . . . . . . . 13
Using passwords. . . . . . . . . . . . . . 13
Enabling or disabling a device . . . . . . . . 15
Selecting a startup device . . . . . . . . . . 16
Exiting the Lenovo BIOS Setup Utility program . . 17
Chapter 6. Symptom-to-FRU Index . . 19
Hard disk drive boot error . . . . . . . . . . 19
Power Supply Problems . . . . . . . . . . . 19
POST error codes . . . . . . . . . . . . . 20
Undetermined problems . . . . . . . . . . . 20
Chapter 7. Locating connectors,
controls and components . . . . . .
21
Chapter 8. Replacing hardware . . . . 29
General information . . . . . . . . . . . . . 29
Replacing the keyboard and mouse . . . . . . 30
Removing the computer cover . . . . . . . . 30
Replacing the power supply assemby . . . . . 31
Removing the front bezel . . . . . . . . . . 32
Replacing an optical drive . . . . . . . . . . 33
Replacing the M.2 storage drive . . . . . . . . 34
Replacing the 3.5-inch storage drive . . . . . . 35
Replacing the 2.5-inch storage drive . . . . . . 37
Replacing the front card reader . . . . . . . . 38
Replacing the PCI Express card . . . . . . . . 39
Replacing a memory module . . . . . . . . . 40
Replacing the Wi-Fi card. . . . . . . . . . . 42
Replacing the front Wi-Fi antenna . . . . . . . 43
Replacing the rear Wi-Fi antenna . . . . . . . 44
Replacing the heat-sink and fan assembly . . . . 44
Replacing the microprocessor . . . . . . . . 45
Replacing the front fan . . . . . . . . . . . 47
Replacing the rear fan . . . . . . . . . . . . 48
Replacing the motherboard. . . . . . . . . . 49
Chapter 9. FRU lists . . . . . . . . . . 51
Chapter 10. General information . . . 73
Additional Service Information . . . . . . . . 73
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