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Lenovo ThinkCentre A52 User Manual - Page 94

Undetermined problems, Message/Symptom, FRU/Action, Keyboard

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Message/Symptom Some or all keys on the keyboard do not work FRU/Action 1. Keyboard 2. Keyboard Cable 3. System Board Undetermined problems Check the power supply voltages (see "Power Supply Errors" on page 57). If the voltages are correct, return here and continue with the following steps. 1. Power-off the computer. 2. Remove or disconnect the following components (if installed) one at a time. a. External devices (modem, printer, or mouse) b. Any adapters c. Riser card d. Memory modules e. Extended video memory f. External Cache g. External Cache RAM h. Hard disk drive i. Diskette drive 3. Power-on the computer to re-test the system. 4. Repeat steps 1 through 3 until you find the failing device or adapter. If all devices and adapters have been removed, and the problem continues, replace the system board. 88 Hardware Maintenance Manual

Section	Page
Contents	5
Chapter 1. About this manual	7
Important Safety Information	7
Strategy for replacing FRUs for CTO, CMV, and GAV products	8
Product definition	8
FRU Identification for CTO, CMV, and GAV products	8
Using PEW	8
Using eSupport	9
Using the HMM	9
Important information about replacing RoHS compliant FRUs	9
Chapter 2. Safety information	11
General safety	11
Electrical safety	11
Safety inspection guide	13
Handling electrostatic discharge-sensitive devices	14
Grounding requirements	14
Safety notices (multi-lingual translations)	15
Chapter 3. General information	45
Additional information resources	45
Physical specifications	45
Types 8099, 8116, 8155, 8156, 8157, 8158, 8159, 8160, 8215, 9210, and 9211	46
Types 8110, 8112, 8113, 8114, 8115, 8153, 8166, 8167, 8168, 8169, and 8170	47
Types 8111, 8154, 8161, 8162, 8163, 8165, 8211, 8212, 8213, and 8214	48
Chapter 4. General Checkout	49
Problem determination tips	50
Chapter 5. Diagnostics using PC-Doctor for DOS	53
Starting PC-Doctor from the Rescue and Recovery workspace	53
Starting PC-Doctor from a diagnostic diskette or CD-ROM	54
Diagnostics program download	54
Navigating through the diagnostics programs	54
Running diagnostics tests	54
Test selection	55
Test results	55
Fixed disk advanced test (FDAT)	55
Quick and Full erase - hard drive	57
Viewing the test log	58
Chapter 6. Using the Setup Utility	59
Starting the Setup Utility program	59
Viewing and changing settings	59
Exiting from the Setup Utility program	59
Using passwords	59
Password considerations	60
User Password	60
Administrator Password	60
IDE Drive User Password	60
IDE Drive Master Password	60
Setting, changing, and deleting a password	61
Using Security Profile by Device	61
Selecting a startup device	62
Selecting a temporary startup device	62
Changing the startup device sequence	62
Advanced settings	62
Chapter 7. Symptom-to-FRU Index	63
Hard disk drive boot error	63
Power Supply Errors	63
Diagnostic error codes	65
Beep symptoms	86
No-beep symptoms	88
POST error codes	89
Miscellaneous error messages	92
Undetermined problems	94
Chapter 8. FRU lists	95
Machine Type 8099	96
Machine Type 8110	115
Machine Type 8111	131
Machine Type 8112	147
Machine Type 8113	161
Machine Type 8114	188
Machine Type 8115	205
Machine Type 8116	219
Machine Type 8153	234
Machine Type 8154	242
Machine Type 8155	250
Machine Type 8156	259
Machine Type 8157	267
Machine Type 8158	276
Machine Type 8159	286
Machine Type 8160	294
Machine Type 8161	303
Machine Type 8162	311
Machine Type 8163	319
Machine Type 8164	327
Machine Type 8165	335
Machine Type 8166	343
Machine Type 8167	349
Machine Type 8168	356
Machine Type 8169	367
Machine Type 8170	374
Machine Type 8211	381
Machine Type 8212	396
Machine Type 8213	423
Machine Type 8214	442
Machine Type 8215	458
Machine Type 9210	485
Machine Type 9211	504
Chapter 9. Additional Service Information	521
Security features	521
Hardware controlled Passwords	521
Operating system password	521
Vital product data	521
Management Information Format (MIF)	521
BIOS levels	522
Flash update procedures	522
Updating (flashing) BIOS from a diskette or CD-ROM	522
Updating (flashing) BIOS from your operating system	522
Recovering from a POST/BIOS update failure	523
Power management	524
Automatic configuration and power interface (ACPI) BIOS	524
Automatic Power-On features	524
Recovering software using the Rescue and Recovery program	525
Starting the Rescue and Recovery workspace	525
Appendix. Notices	527
Television output notice	528