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Lenovo ThinkCentre M91p Hardware Maintenance Manual - Page 116

Replacing the rear fan assembly

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6. Insert the two tabs 2 of the new front fan assembly into the corresponding holes in the chassis, and press the other two tabs 1 through the holes until the front fan assembly is secured in place. Figure 42. Installing the front fan assembly 7. Connect the front fan assembly cable to the power fan connector on the system board. 8. To complete the installation or replacement, go to "Completing the parts replacement" on page 113. Replacing the rear 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 rear fan assembly. To replace the rear 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 79. 3. Locate the rear fan assembly. See "Locating components" on page 76. 4. Disconnect the rear fan assembly cable from the system fan connector on the system board. See "Locating parts on the system board" on page 77. 108 ThinkCentre Hardware Maintenance Manual

Section	Page
Chapter 1. About this manual	9
Important safety information	9
Important information about replacing RoHS compliant FRUs	9
Chapter 2. Safety information	11
General safety	11
Electrical safety	11
Voltage-selection switch	13
Safety inspection guide	13
Handling electrostatic discharge-sensitive devices	14
Grounding requirements	14
Safety notices (multi-lingual translations)	14
Chapter 3. General information	41
Lenovo Welcome	41
Lenovo ThinkVantage Tools	41
Lenovo Solution Center	41
SimpleTap	41
Lenovo ThinkVantage Toolbox	41
ThinkVantage Productivity Center	42
Additional information resources	42
Specifications	42
For machine types: 4468, 4473, 4476, 4479, 4495, 4497, 4499, 4504, 4513, 4517, 4524, 7021, 7032, 7034, 7049, 7052, 7053, 7073, 7136, and 7178.	42
For machine types: 4466, 4471, 4474, 4477, 4480, 4485, 4496, 4498, 4503, 4512, 4514, 4518, 4554, 7005, 7023, 7033, 7035, 7072, 7079, and 7177.	43
Chapter 4. General checkout	45
Problem determination tips	45
Chapter 5. Diagnostic programs	47
Lenovo ThinkVantage Toolbox	47
Lenovo Solution Center	47
PC-Doctor for DOS	48
Creating a diagnostic disc	48
Running the diagnostic program from the diagnostic disc	48
Navigating through the diagnostic programs	48
Running tests	48
Viewing the test log	50
Chapter 6. Using the Setup Utility program	51
Starting the Setup Utility program	51
Viewing or changing settings	51
Using passwords	51
Password considerations	52
Power-on password	52
Administrator password	52
Hard Disk Password	52
Setting, changing, or deleting a password	52
Erasing lost or forgotten passwords (clearing CMOS)	53
Enabling or disabling a device	53
Selecting a startup device	54
Selecting a temporary startup device	54
Selecting or changing the startup device sequence	54
Smart performance choices	54
Exiting the Setup Utility program	55
Chapter 7. Symptom-to-FRU index	57
Hard disk drive boot error	57
Power Supply Problems	57
Diagnostic error codes	57
Beep symptoms	75
POST error codes	76
Miscellaneous error messages	77
Undetermined problems	79
Chapter 8. Replacing FRUs (Machine Types: 4468, 4473, 4476, 4479, 4495, 4497, 4499, 4504, 4513, 4517, 4524, 7021, 7032, 7034, 7049, 7052, 7053, 7073, 7136, and 7178.)	81
Locations	81
Locating connectors, controls, and indicators on the front of your computer	82
Locating connectors on the rear of your computer	83
Locating components	84
Locating parts on the system board	85
Locating internal drives	86
Handling static-sensitive devices	86
Installing or replacing hardware	87
Removing the computer cover	87
Removing and reinstalling the front bezel	88
Installing or replacing a PCI card	89
Installing or replacing a memory module	92
Installing or replacing the optical drive	94
Installing or replacing the card reader	96
Replacing the battery	100
Replacing the power supply assembly	101
Replacing the heat sink and fan assembly	103
Replacing the microprocessor	105
Replacing the system board	108
Replacing the primary hard disk drive	111
Replacing the secondary hard disk drive	113
Replacing the front fan assembly	115
Replacing the rear fan assembly	116
Replacing the front audio and USB assembly	118
Replacing the internal speaker	119
Completing the parts replacement	121
Chapter 9. Replacing FRUs (Machine Types: 4466, 4471, 4474, 4477, 4480, 4485, 4496, 4498, 4503, 4512, 4514, 4518, 4554, 7005, 7023, 7033, 7035, 7072, 7079, and 7177.)	123
Locations	123
Locating connectors, controls, and indicators on the front of your computer	124
Locating connectors on the rear of your computer	125
Locating components	126
Locating parts on the system board	127
Locating internal drives	128
Handling static-sensitive devices	128
Installing or replacing hardware	129
Opening the computer cover	129
Removing and reinstalling the front bezel	130
Accessing the system board components and drives	132
Installing or replacing a memory module	133
Installing or replacing a PCI card	134
Installing or replacing the card reader	136
Replacing the battery	141
Replacing the hard disk drive	142
Replacing the optical drive	145
Replacing the heat sink and fan assembly	147
Replacing the power supply assembly	150
Replacing the microprocessor	155
Replacing the system board	158
Replacing the system fan assembly	161
Replacing the internal speaker	163
Replacing the front audio and USB assembly	167
Completing the parts replacement	168
Chapter 10. FRU lists	171
Overall: MT 4468, 4473, 4476, 4479, 4495, 4497, 4499, 4504, 4513, 4517, 4524, 7021, 7032, 7034, 7049, 7052, 7053, 7073, 7136, and 7178	171
Mechanical FRUs	190
Keyboard and Mouse	202
Adapters and miscellaneous FRUs	258
Power Cords	262
Recovery discs	274
Windows 7 Professional 32 Recovery CD	274
Windows 7 Home Basic 32 Recovery CD	283
Windows 7 Home Premium 32 Recovery CD	286
Windows 7 Home Premium 64 Recovery CD	286
Windows 7 Professional 64 Recovery CD	291
Windows XP Professional 32 Recovery CD	299
Windows XP Professionally Generic 32 Recovery CD	304
Windows Vista Business 32 Recovery CD	306
Windows Vista Home Basic 32 Recovery CD	307
Overall: MT 4466, 4471, 4474, 4477, 4480, 4485, 4496, 4498, 4503, 4512, 4514, 4518, 4554, 7005, 7023, 7033, 7035, 7072, 7079, and 7177	309
Mechanical FRUs	334
Keyboard and Mouse	352
Adapters and miscellaneous FRUs	420
Power Cords	424
Recovery discs	439
Windows 7 Professional 32 Recovery CD	439
Windows 7 Home Basic 32 Recovery CD	450
Windows 7 Home Premium 32 Recovery CD	453
Windows 7 Home Premium 64 Recovery CD	454
Windows 7 Professional 64 Recovery CD	459
Windows XP Professional 32 Recovery CD	469
Windows XP Professionally Generic 32 Recovery CD	476
Windows Vista Business 32 Recovery CD	479
Windows Vista Home Basic 32 Recovery CD	480
Chapter 11. Additional service information	483
Security features	483
Hardware-controlled passwords	483
Operating system password	483
Vital Product Data	483
BIOS levels	483
Updating (flashing) the BIOS from a disc	483
Updating (flashing) the BIOS from your operating system	484
Recovering from a POST and BIOS update failure	484
Power management	485
Advanced Configuration and Power Interface (ACPI) BIOS	485
Automatic Power-On features	485
Appendix A. Notices	487
Television output notice	488
European conformance CE mark	488
Trademarks	488