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Lenovo ThinkCentre M92 Hardware Maintenance Manual (HMM) (May 2012) - ThinkCen - Page 240

Remove the power cord from the ac power adapter cable loop at the rear of the computer and then

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2. Remove the power cord from the ac power adapter cable loop at the rear of the computer and then disconnect the ac power adapter from the ac power adapter connector. See "Locating connectors on the rear of your computer" on page 88. Figure 189. Disconnecting the ac power adapter 234 ThinkCentre Hardware Maintenance Manual

Section	Page
Chapter 1. About this manual	7
Important safety information	7
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	12
Safety notices (multi-lingual translations)	12
Chapter 3. General information	39
Lenovo Welcome	39
Lenovo ThinkVantage Tools	39
Lenovo Solution Center	39
SimpleTap	40
Additional information resources	40
Specifications	40
For machine types: 2697, 2698, 2742, 2750, 2935, 2943, 2960, 2967, 2986, 2992, 2994, 2999, 3182, 3184, 3186, 3190, 3201, 3204, 3208, 3212, 3217, 3220, 3226, 3228, 3302, 3391, and 3392	41
For machine types: 2756, 2800, 2929, 2932, 2934, 2941, 2945, 2961, 2982, 2988, 2993, 2996, 3181, 3183, 3185, 3187, 3198, 3202, 3207, 3209, 3214, 3218, 3224, 3227, 3306, 3393, and 3395	41
For machine types: 2119, 2121, 3229, 3234, 3235, 3236, 3237, 3238, 3240, 3242, and 3243	43
Chapter 4. General checkout	45
Problem determination tips	45
Chapter 5. Troubleshooting and diagnostics	47
Basic troubleshooting	47
Troubleshooting procedure	48
Troubleshooting	48
Audio problems	49
CD problems	50
DVD problems	51
Intermittent problems	52
Hard disk drive problems	53
Keyboard, mouse, or pointing device problems	53
Monitor problems	55
Networking problems	57
Option problems	59
Performance and lockup problems	60
Printer problems	62
Serial port problems	62
Software problems	62
USB problems	63
Diagnostics	64
Lenovo Solution Center	64
Chapter 6. Using the Setup Utility program	65
Starting the Setup Utility program	65
Viewing and changing settings	65
Using passwords	65
Password considerations	66
Power-On Password	66
Administrator Password	66
Hard Disk Password	66
Setting, changing, and deleting a password	66
Erasing lost or forgotten passwords (clearing CMOS)	67
Enabling or disabling a device	67
Selecting a startup device	68
Selecting a temporary startup device	68
Selecting or changing the startup device sequence	68
Enabling ErP compliance mode	68
ICE performance mode	69
ICE thermal alert	70
Exiting the Setup Utility program	70
Chapter 7. Symptom-to-FRU index	71
Hard disk drive boot error	71
Power supply problems	71
Beep symptoms	71
POST error codes	72
Miscellaneous error messages	74
Undetermined problems	75
Chapter 8. Locations	77
For machine types: 2697, 2698, 2742, 2750, 2935, 2943, 2960, 2967, 2986, 2992, 2994, 2999, 3182, 3184, 3186, 3190, 3201, 3204, 3208, 3212, 3217, 3220, 3226, 3228, 3302, 3391, and 3392	77
Locating connectors, controls, and indicators on the front of your computer	77
Locating connectors on the rear of your computer	78
Locating major FRUs and CRUs	79
Looking up FRU information	81
Locating parts on the system board	81
Locating internal drives	84
For machine types: 2756, 2800, 2929, 2932, 2934, 2941, 2945, 2961, 2982, 2988, 2993, 2996, 3181, 3183, 3185, 3187, 3198, 3202, 3207, 3209, 3214, 3218, 3224, 3227, 3306, 3393, and 3395	85
Locating connectors, controls, and indicators on the front of your computer	85
Locating connectors on the rear of your computer	86
Locating major FRUs and CRUs	87
Looking up FRU information	89
Locating parts on the system board	89
Locating internal drives	92
For machine types: 2119, 2121, 3229, 3234, 3235, 3236, 3237, 3238, 3240, 3242, and 3243	93
Locating connectors, controls, and indicators on the front of your computer	93
Locating connectors on the rear of your computer	94
Locating major FRUs and CRUs	95
Looking up FRU information	97
Locating parts on the system board	98
Chapter 9. Replacing FRUs (machine types: 2697, 2698, 2742, 2750, 2935, 2943, 2960, 2967, 2986, 2992, 2994, 2999, 3182, 3184, 3186, 3190, 3201, 3204, 3208, 3212, 3217, 3220, 3226, 3228, 3302, 3391, and 3392)	99
Handling static-sensitive devices	99
Installing or replacing hardware	99
Removing the computer cover	100
Removing and reinstalling the front bezel	101
Installing or replacing a PCI card	101
Installing or replacing a memory module	104
Installing or replacing the optical drive	106
Installing or replacing the card reader	108
Replacing the battery	112
Replacing the power supply assembly	113
Replacing the heat sink and fan assembly	115
Replacing the microprocessor	117
Replacing the system board	120
Installing the solid state drive	123
Installing or replacing the mSATA solid state drive	125
Replacing the primary hard disk drive	130
Replacing the secondary hard disk drive	132
Replacing the front fan assembly	134
Replacing the rear fan assembly	136
Replacing the front audio and USB assembly	138
Replacing the internal speaker	139
Replacing the thermal sensor	141
Replacing the cover presence switch	143
Replacing the WiFi units	145
Installing or removing the rear WiFi antenna	152
Installing or removing the front WiFi antenna	153
Replacing the keyboard or mouse	155
Completing the parts replacement	156
Chapter 10. Replacing FRUs (machine types: 2756, 2800, 2929, 2932, 2934, 2941, 2945, 2961, 2982, 2988, 2993, 2996, 3181, 3183, 3185, 3187, 3198, 3202, 3207, 3209, 3214, 3218, 3224, 3227, 3306, 3393, and 3395)	159
Handling static-sensitive devices	159
Installing or replacing hardware	159
Opening the computer cover	160
Removing and reinstalling the front bezel	160
Accessing the system board components and drives	162
Installing or replacing a memory module	163
Installing or replacing a PCI card	165
Installing or replacing the card reader	167
Installing or replacing the mSATA solid state drive	172
Replacing the battery	179
Installing the solid state disk	180
Replacing the hard disk drive	182
Replacing the optical drive	184
Replacing the heat sink and fan assembly	187
Replacing the power supply assembly	190
Replacing the microprocessor	195
Replacing the system board	198
Replacing the cover presence switch	201
Replacing the internal speaker	203
Replacing the front audio and USB assembly	205
Replacing the WiFi units	207
Installing or removing the rear WiFi antenna	211
Installing or removing the front WiFi antenna	213
Replacing the keyboard or mouse	216
Completing the parts replacement	216
Chapter 11. Replacing FRUs (machine types: 2119, 2121, 3229, 3234, 3235, 3236, 3237, 3238, 3240, 3242, and 3243)	219
Handling static-sensitive devices	219
Installing or replacing hardware	219
Installing or removing the vertical stand	219
Installing or removing the VESA mount bracket	221
Removing the computer cover	223
Installing or replacing a memory module	225
Replacing the optical drive	227
Replacing the secondary hard disk drive	232
Replacing the battery	238
Replacing the ac power adapter	239
Replacing the ac power adapter bracket	241
Replacing the power switch board	243
Replacing the heat sink	245
Replacing the microprocessor	248
Replacing the system board	250
Replacing the hard disk drive bracket	253
Replacing the hard disk drive	257
Replacing the WiFi card module	258
Installing or removing the rear WiFi antenna	260
Replacing the system fan	263
Replacing the internal speaker	265
Replacing the keyboard or mouse	267
Completing the parts replacement	268
Chapter 12. Additional service information	271
Security features	271
Hardware-controlled passwords	271
Operating system password	271
Vital Product Data	271
BIOS levels	271
Updating (flashing) the BIOS from a disc	271
Updating (flashing) the BIOS from your operating system	272
Recovering from a POST/BIOS update failure	272
Power management	273
Advanced Configuration and Power Interface (ACPI) BIOS	273
Automatic Power-On features	273
Appendix A. Notices	275
Television output notice	276
European conformance CE mark	276
Trademarks	276