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Lenovo ThinkCentre Edge 91 Hardware Maintenance Manual (HMM) (April 2012) - Th - Page 84

Removing and reinstalling the front bezel

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5. Remove the two screws that secure the computer cover and slide the computer cover to the rear to remove it. 5 6 7 8 3 4 Figure 6. 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 1. 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 79. 80 ThinkCentre Hardware Maintenance Manual

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	37
Lenovo Welcome	37
Lenovo ThinkVantage Tools	37
Lenovo Solution Center	37
SimpleTap	37
Additional information resources	38
Specifications	38
For machine types: 1852, 1853, 1855, 3247, and 3248	38
For machine types: 1857, 1893, 1895, 3250, and 3253	39
Chapter 4. General checkout	41
Problem determination tips	41
Chapter 5. Diagnostic programs	43
Lenovo ThinkVantage Toolbox	43
Lenovo Solution Center	43
PC-Doctor for DOS	44
Creating a diagnostic disc	44
Running the diagnostic program from the diagnostic disc	44
Navigating through the diagnostic programs	44
Running tests	44
Viewing the test log	46
Chapter 6. Using the Setup Utility program	47
Starting the Setup Utility program	47
Viewing and changing settings	47
Using passwords	47
Password considerations	48
Power-On Password	48
Administrator Password	48
Hard Disk Password	48
Setting, changing, and deleting a password	48
Erasing lost or forgotten passwords (clearing CMOS)	49
Enabling or disabling a device	49
Selecting a startup device	50
Selecting a temporary startup device	50
Selecting or changing the startup device sequence	50
Enabling ErP compliance mode	50
Exiting the Setup Utility program	51
Chapter 7. Symptom-to-FRU index	53
Hard disk drive boot error	53
Power supply problems	53
Diagnostic error codes	53
Beep symptoms	71
POST error codes	71
Miscellaneous error messages	73
Undetermined problems	75
Chapter 8. Replacing FRUs (Machine Types: 1852, 1853, and 1855)	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 components	80
Locating parts on the system board	81
Locating internal drives	82
Handling static-sensitive devices	82
Installing or replacing hardware	83
Removing the computer cover	83
Removing and reinstalling the front bezel	84
Installing or replacing a PCI card	86
Installing or replacing a memory module	89
Replacing the battery	91
Replacing the primary hard disk drive	92
Replacing the optical drive	94
Replacing the power supply assembly	96
Replacing the heat sink and fan assembly	98
Replacing the microprocessor	100
Replacing the system board	102
Replacing the rear fan assembly	105
Replacing the front audio and USB assembly	107
Completing the parts replacement	108
Chapter 9. Replacing FRUs (Machine Types: 1857, 1893, and 1895)	111
Locations	111
Locating connectors, controls, and indicators on the front of your computer	111
Locating connectors on the rear of your computer	112
Locating components	112
Locating parts on the system board	113
Locating internal drives	115
Handling static-sensitive devices	115
Installing or replacing hardware	116
Removing the computer cover	116
Removing and reinstalling the front bezel	117
Accessing the system board components and drives	118
Installing or replacing a PCI card	120
Installing or replacing a memory module	122
Replacing the battery	123
Replacing the hard disk drive	124
Replacing the optical drive	127
Replacing the power supply assembly	130
Replacing the heat sink and fan assembly	134
Replacing the microprocessor	137
Replacing the system board	140
Replacing the system fan assembly	143
Replacing the front audio and USB assembly	144
Completing the parts replacement	145
Chapter 10. FRU lists	147
Overall: 1852, 1853, 1855, 3247, and 3248	147
Mechanical FRUs	153
Keyboard and Mouse	156
Adapters and miscellaneous FRUs	181
Power Cords	182
Recovery discs	187
Windows 7 Starter Recovery CD	187
Windows 7 Home Basic 32 Recovery CD	188
Windows 7 Home Premium 32 Recovery CD	189
Windows 7 Home Premium 64 Recovery CD	190
Windows 7 Professional 32 Recovery CD	193
Windows 7 Professional 64 Recovery CD	194
Windows XP Professional 32 Recovery CD	196
Windows XP Professional Generic 32 Recovery CD	196
Overall: MT 1857, 1893, 1895, 3250, and 3253	199
Mechanical FRUs	206
Keyboard and Mouse	209
Adapters and miscellaneous FRUs	234
Power Cords	234
Recovery discs	239
Windows 7 Starter Recovery CD	239
Windows 7 Home Basic 32 Recovery CD	240
Windows 7 Home Premium 32 Recovery CD	241
Windows 7 Home Premium 64 Recovery CD	242
Windows 7 Professional 32 SP 1 Recovery CD	245
Windows 7 Professional 64 SP 1 Recovery CD	246
Windows XP Professional 32 Recovery CD	248
Windows XP Professional Generic Recovery CD	248
Chapter 11. Additional service information	253
Security features	253
Hardware-controlled passwords	253
Operating system password	253
Vital Product Data	253
BIOS levels	253
Updating (flashing) the BIOS from a disc	253
Updating (flashing) the BIOS from your operating system	254
Recovering from a POST/BIOS update failure	254
Power management	255
Advanced Configuration and Power Interface (ACPI) BIOS	255
Automatic Power-On features	255
Appendix A. Notices	257
Television output notice	258
European conformance CE mark	258
Trademarks	258