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To access the system board components and drives: 1. Remove the computer cover. See "Removing the computer cover" on page 117. 2. Remove the front bezel by releasing the three tabs and pivoting the bezel forward to remove completely. Figure 1. Removing the bezel 3. In some models, you might have to remove the PCI adapter card in order to gain access to the battery. Figure 2. Removing the PCI adapter card 120 Hardware Maintenance Manual

Section	Page
Contents	5
Chapter 1. About this manual	7
Important Safety Information	7
Important information about replacing RoHS compliant FRUs	8
Chapter 2. Safety information	9
General safety	9
Electrical safety	9
Voltage-selection switch	11
Safety inspection guide	11
Handling electrostatic discharge-sensitive devices	12
Grounding requirements	13
Safety notices (multi-lingual translations)	13
Chapter 3. General information	45
The ThinkVantage® Productivity Center program	45
Additional information resources	45
Specifications	46
Machine types: 9120, 9127, 9129, 9134, 9136, 9139, 9141, 9143, 9156, 9158, 9171, and 9191.	46
Machine types: 9126, 9128, 9130, 9135, 9137, 9140, 9142, 9144, 9157, 9159, 9169, and 9189.	47
Chapter 4. General Checkout	49
Problem determination tips	49
Chapter 5. Diagnostics	51
PC-Doctor for Windows	51
PC-Doctor for Windows PE	51
Running diagnostics from the Rescue and Recovery workspace	52
PC-Doctor for DOS	52
Creating a diagnostic CD image	52
Creating diagnostic diskettes	52
Running diagnostics from the CD or diskettes	53
Navigating through the diagnostics programs	53
Running tests	53
Test results	54
Quick and Full erase - hard drive	54
Viewing the test log	55
Chapter 6. Using the Setup Utility	57
Starting the Setup Utility program	57
Viewing and changing settings	57
Using passwords	57
Password considerations	57
User Password	58
Administrator Password	58
Setting, changing, and deleting a password	58
Selecting a startup device	58
Selecting a temporary startup device	58
Selecting or changing the startup device sequence	59
Advanced settings	59
Exiting from the Setup Utility program	59
Chapter 7. Symptom-to-FRU Index	61
Hard disk drive boot error	61
Power Supply Problems	61
Diagnostic error codes	63
Beep symptoms	84
POST error codes	85
Miscellaneous error messages	87
Undetermined problems	88
Chapter 8. Replacing FRUs (Machine types: 9120, 9127, 9129, 9134, 9136, 9139, 9141, 9143, 9156, 9158, 9171, and 9191.)	91
Rear connectors	92
Removing the computer cover	93
Locations	94
Locating parts on the system board	95
Removing and reinstalling the front bezel	95
Replacing the power supply	96
Replacing the system board	98
Replacing the microprocessor	102
Replacing a memory module	105
Replacing a PCI adapter card	106
Replacing the hard disk drive	108
Replacing the optical drive	111
Replacing the diskette drive	112
Replacing the front fan assembly	113
Replacing the rear fan assembly	116
Replacing the front audio/USB assembly	117
Replacing the power switch/LED assembly	118
Replacing the CMOS battery	119
Completing the FRU replacement	120
Chapter 9. Replacing FRUs (Machine types: 9126, 9128, 9130, 9135, 9137, 9140, 9142, 9144, 9157, 9159, 9169, and 9189.)	121
Rear connectors	122
Removing the computer cover	123
Locations	124
Locating parts on the system board	125
Accessing the system board components and drives	125
Replacing a memory module	127
Replacing the CMOS battery	129
Replacing the power supply	130
Replacing the system board	132
Replacing the microprocessor	135
Replacing the hard disk drive	138
Replacing the optical drive	140
Replacing the diskette drive	141
Replacing the power switch/LED assembly	142
Replacing the front panel card	143
Replacing the system fan assembly	144
Replacing a PCI adapter card	145
Completing the FRU replacement	146
Chapter 10. FRU lists	147
Machine Type 9120	147
Machine Type 9126	161
Machine Type 9129	170
Machine Type 9134	179
Machine Type 9135	191
Machine Type 9136	200
Machine Type 9137	213
Machine Type 9140	226
Machine Type 9141	239
Machine Type 9142	252
Machine Type 9143	265
Machine Type 9144	280
Machine Type 9156	295
Machine Type 9157	309
Machine Type 9158	320
Machine Type 9159	334
Machine Type 9169	348
Machine Type 9171	361
Machine Type 9189	375
Machine Type 9191	388
Chapter 11. Additional Service Information	401
Security features	401
Hardware controlled Passwords	401
Operating system password	401
Vital product data	401
BIOS levels	401
Flash update procedures	402
Updating (flashing) BIOS from a diskette	402
Recovering from a POST/BIOS update failure	402
Power management	403
Automatic configuration and power interface (ACPI) BIOS	403
Automatic Power-On features	403
Appendix. Notices	405
Television output notice	406