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Lenovo ThinkCentre M77 Hardware Maintenance Manual (HMM) - ThinkCentre M77 - Page 145

system board. The four screws cannot be removed from the heat sink and fan assembly.

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3. Disconnect the heat sink and fan assembly cable from the microprocessor fan connector on the system board. See "Locating parts on the system board" on page 77. 4. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the system board: a. Partially remove screw 1 , then fully remove screw 2 , and then fully remove screw 1 . b. Partially remove screw 3 , then fully remove screw 4 , and then fully remove screw 3 . Note: Carefully remove the four screws from the system board to avoid any possible damage to the system board. The four screws cannot be removed from the heat sink and fan assembly. Figure 75. Screws that secure the heat sink and fan assembly 5. Lift the heat sink and fan assembly with the fan duct off the system board. Notes: a. You might have to gently twist the heat sink and fan assembly to free it from the microprocessor. b. When handling the heat sink and fan assembly, do not touch the thermal grease on the bottom of the heat sink and fan assembly. Chapter 9. Replacing FRUs (Machine Types: 1996, 1997, 2002, 2010, 2208, 2209, 2221, 2224, 2226, and 2227.) 141

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
SimpleTap	37
Lenovo Solution Center	38
Additional information resources	38
Specifications	38
For machine types: 1982, 1983, 1985, 1986, 1987, 1990, 1992, 1993, 1994, and 1995.	39
For machine types: 1996, 1997, 2002, 2010, 2208, 2209, 2221, 2224, 2226, and 2227.	40
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: 1982, 1983, 1985, 1986, 1987, 1990, 1992, 1993, 1994, and 1995.)	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	85
Installing or replacing a memory module	88
Installing or replacing the optical drive	90
Installing or replacing the card reader	92
Replacing the battery	96
Replacing the power supply assembly	97
Replacing the heat sink and fan assembly	99
Replacing the microprocessor	101
Replacing the primary hard disk drive	103
Replacing the secondary hard disk drive	105
Replacing the front fan assembly	107
Replacing the rear fan	109
Replacing the front audio and USB assembly	111
Replacing the internal speaker	112
Replacing the system board	114
Completing the parts replacement	116
Chapter 9. Replacing FRUs (Machine Types: 1996, 1997, 2002, 2010, 2208, 2209, 2221, 2224, 2226, and 2227.)	119
Locations	119
Locating connectors, controls, and indicators on the front of your computer	120
Locating connectors on the rear of your computer	121
Locating components	122
Locating parts on the system board	123
Locating internal drives	124
Handling static-sensitive devices	124
Installing or replacing hardware	125
Opening the computer cover	125
Removing and reinstalling the front bezel	126
Accessing the system board components and drives	128
Installing or replacing a memory module	129
Installing or replacing a PCI card	131
Installing or replacing the card reader	133
Replacing the battery	138
Replacing the hard disk drive	139
Replacing the optical drive	142
Replacing the heat sink and fan assembly	144
Replacing the power supply assembly	147
Replacing the microprocessor	152
Replacing the front audio and USB assembly	155
Replacing the system fan	156
Replacing the internal speaker	158
Replacing the system board	162
Completing the parts replacement	164
Chapter 10. FRU lists	165
Overall: 1982, 1983, 1985, 1986, 1987, 1990, 1992, 1993, 1994, and 1995	165
Mechanical FRUs	171
Keyboard and Mouse	176
Adapters and miscellaneous FRUs	193
Power Cords	195
Recovery discs	200
Windows 7 Home Basic 32 SP1 Recovery CD	200
Windows 7 Home Premium 32 SP1 Recovery CD	202
Windows 7 Home Premium 64 SP1 Recovery CD	204
Windows 7 Professional 32 SP1 Recovery CD	204
Windows 7 Professional 64 SP1 Recovery CD	208
Windows 7 Ultimate 32 SP1 Recovery CD	211
Windows 7 Ultimate 64 SP1 Recovery CD	212
Windows 7 Starter 32 SP1 Recovery CD	212
Overall: MT 1996, 1997, 2010, 2209, and 2227	213
Mechanical FRUs	222
Keyboard and Mouse	230
Adapters and miscellaneous FRUs	255
Power Cords	257
Recovery discs	264
Windows 7 Home Basic 32 SP1 Recovery CD	264
Windows 7 Home Premium 32 SP1 Recovery CD	266
Windows 7 Home Premium 64 SP1 Recovery CD	269
Windows 7 Professional 32 SP1 Recovery CD	270
Windows 7 Professional 64 SP1 Recovery CD	276
Windows 7 Ultimate 32 SP1 Recovery CD	280
Windows 7 Ultimate 64 SP1 Recovery CD	281
Windows 7 Starter 32 SP1 Recovery CD	281
Chapter 11. Additional service information	283
Security features	283
Hardware-controlled passwords	283
Operating system password	283
Vital Product Data	283
BIOS levels	283
Updating (flashing) the BIOS from a disc	283
Updating (flashing) the BIOS from your operating system	284
Recovering from a POST and BIOS update failure	284
Power management	285
Advanced Configuration and Power Interface (ACPI) BIOS	285
Automatic Power-On features	285
Appendix A. Notices	287
Television output notice	288
Europeanpean conformance CE mark	288
Trademarks	288

Match case Limit results 1 per page

3. Disconnect the heat sink and fan assembly cable from the microprocessor fan connector on the system

board. See “Locating parts on the system board” on page 77.

4. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the

system board:

Partially remove screw

, then fully remove screw

, and then fully remove screw

b. Partially remove screw

, then fully remove screw

, and then fully remove screw

Note:

Carefully remove the four screws from the system board to avoid any possible damage to the

system board. The four screws cannot be removed from the heat sink and fan assembly.

Figure 75. Screws that secure the heat sink and fan assembly

5. Lift the heat sink and fan assembly with the fan duct off the system board.

Notes:

You might have to gently twist the heat sink and fan assembly to free it from the microprocessor.

b. When handling the heat sink and fan assembly, do not touch the thermal grease on the bottom

of the heat sink and fan assembly.

Chapter 9

Replacing FRUs (Machine Types: 1996, 1997, 2002, 2010, 2208, 2209, 2221, 2224, 2226, and 2227.)

141