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Lenovo ThinkCentre Edge 72 Hardware Maintenance Manual (HMM) for ThinkCentre E - Page 137

Remove the computer cover. See Removing the computer cover

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10. Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until it snaps into position. Figure 74. Installing the heat sink fan duct 11. Secure the power supply assembly cables with the cable clips and ties in the chassis. 12. To complete the installation or replacement, go to "Completing the parts replacement" on page 154. 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" in the ThinkCentre User Guide. To obtain a copy of the ThinkCentre User Guide, go to: http://www.lenovo.com/ThinkCentreUserGuides 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. Turn off the computer and wait three to five minutes to let the computer cool before removing the computer cover. 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 116. 3. Remove the front bezel. See "Removing and reinstalling the front bezel" on page 117. Chapter 10. Replacing FRUs (Machine Types: 3493, 3496, and 3497) 133

Section	Page
Chapter 1. About this manual	5
Important safety information	5
Chapter 2. Safety information	7
General safety	7
Electrical safety	7
Voltage-selection switch	9
Safety inspection guide	9
Handling electrostatic discharge-sensitive devices	10
Grounding requirements	10
Safety notices (multi-lingual translations)	10
Chapter 3. General information	33
Specifications	33
For machine types: 3484, 3485, and 3492	33
For machine types: 3493, 3496, and 3497	34
Lenovo programs	34
Accessing Lenovo programs on the Windows 7 operating system	34
Accessing Lenovo programs on the Windows 8 operating system	36
Lenovo Support Web site	36
Chapter 4. General checkout	37
Problem determination tips	37
Chapter 5. Troubleshooting and diagnostics	39
Basic troubleshooting	39
Accessing Control Panel on the Windows 8 operating system	40
Troubleshooting procedure	40
Troubleshooting	41
Audio problems	41
CD problems	43
DVD problems	44
Intermittent problems	45
Hard disk drive problems	45
Keyboard, mouse, or pointing device problems	46
Monitor problems	48
Networking problems	49
Option problems	52
Performance and lockup problems	53
Printer problems	55
Serial port problems	55
Software problems	56
USB problems	57
Diagnostics	57
Lenovo Solution Center	57
Chapter 6. Using the Setup Utility program	59
Starting the Setup Utility program	59
Viewing and changing settings	59
Using passwords	59
Password considerations	60
Power-On Password	60
Administrator Password	60
Hard Disk Password	60
Setting, changing, and deleting a password	60
Erasing lost or forgotten passwords (clearing CMOS)	61
Enabling or disabling a device	61
Selecting a startup device	62
Selecting a temporary startup device	62
Selecting or changing the startup device sequence	62
Enabling ErP compliance mode	62
Changing the BIOS settings before installing a new operating system	63
Exiting the Setup Utility program	63
Chapter 7. Symptom-to-FRU index	65
Hard disk drive boot error	65
Power supply problems	65
Beep symptoms	65
POST error codes	66
Miscellaneous error messages	68
Undetermined problems	69
Chapter 8. Locations	71
Locations	71
Locating connectors, controls, and indicators on the front of your computer	71
Locating connectors on the rear of your computer	72
Locating major FRUs and CRUs	73
Looking up FRU information	75
Locating parts on the system board	76
Locating internal drives	77
Locations	77
Locating connectors, controls, and indicators on the front of your computer	78
Locating connectors on the rear of your computer	79
Locating major FRUs and CRUs	80
Looking up FRU information	82
Locating parts on the system board	83
Locating internal drives	84
Chapter 9. Replacing FRUs (Machine Types: 3484, 3485, and 3492)	85
Handling static-sensitive devices	85
Installing or replacing hardware	85
Removing the computer cover	86
Removing and reinstalling the front bezel	87
Installing or replacing a PCI card	88
Replacing the battery	91
Installing or replacing a memory module	92
Replacing the optical drive	94
Replacing the heat sink and fan assembly	96
Replacing the power supply assembly	98
Replacing the microprocessor	99
Replacing the system board	102
Replacing the primary hard disk drive	104
Replacing the front audio and USB assembly	106
Replacing the WiFi units	107
Installing or removing the rear WiFi antenna	113
Installing or removing the front WiFi antenna	114
Completing the parts replacement	116
Chapter 10. Replacing FRUs (Machine Types: 3493, 3496, and 3497)	119
Handling static-sensitive devices	119
Installing or replacing hardware	119
Removing the computer cover	120
Removing and reinstalling the front bezel	121
Accessing the system board components and drives	122
Installing or replacing a PCI card	123
Installing or replacing a memory module	125
Replacing the battery	126
Replacing the hard disk drive	127
Replacing the optical drive	129
Replacing the power supply assembly	133
Replacing the heat sink and fan assembly	137
Replacing the microprocessor	140
Replacing the system board	143
Replacing the system fan assembly	145
Replacing the front audio and USB assembly	147
Replacing the WiFi units	148
Installing or removing the rear WiFi antenna	153
Installing or removing the front WiFi antenna	155
Replacing the keyboard or mouse	157
Completing the parts replacement	158
Chapter 11. Additional service information	161
Security features	161
Hardware-controlled passwords	161
Operating system password	161
Vital Product Data	161
BIOS levels	161
Flash update procedures	161
Updating (flashing) the BIOS from a disc	162
Updating (flashing) the BIOS from your operating system	163
Recovering from a POST and BIOS update failure	163
Power management	164
Advanced Configuration and Power Interface (ACPI) BIOS	164
Automatic Power-on features	164
Appendix A. Notices	165
Television output notice	166
European conformance CE mark	166
Trademarks	166

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10. Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until it snaps

into position.

Figure 74. Installing the heat sink fan duct

11. Secure the power supply assembly cables with the cable clips and ties in the chassis.

12. To complete the installation or replacement, go to “Completing the parts replacement” on page 154.

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”

in the

ThinkCentre User Guide

. To obtain a copy of the

ThinkCentre User Guide

, go to:

http://www.lenovo.com/ThinkCentreUserGuides

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. Turn off the computer and wait three to ﬁve

minutes to let the computer cool before removing the computer cover.

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 116.

3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 117.

Chapter 10

Replacing FRUs (Machine Types: 3493, 3496, and 3497)

133