Lenovo ThinkCentre M92z Hardware Maintenance Manual - ThinkCentre M92z (type 3 - Page 71

Undetermined problems, External Cache RAM

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Message/Symptom Serial or parallel port device failure (adapter port) Some or all keys on the keyboard do not work FRU/Action 1. External Device Self-Test OK? 2. External Device 3. Cable 4. Alternate Adapter 5. System Board 1. Keyboard 2. Keyboard Cable 3. System Board Undetermined problems This section provides instructions on how to find out the failing devices or adapters. 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. Memory modules d. Extended video memory e. External Cache f. External Cache RAM g. Hard disk drive h. 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. Chapter 7. Symptom-to-FRU index 67

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Message/Symptom
FRU/Action
Serial or parallel port device failure (adapter port)
1. External Device Self-Test OK?
2. External Device
3. Cable
4. Alternate Adapter
5. System Board
Some or all keys on the keyboard do not work
1. Keyboard
2. Keyboard Cable
3. System Board
Undetermined problems
This section provides instructions on how to find out the failing devices or adapters.
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.
Memory modules
d. Extended video memory
e.
External Cache
f.
External Cache RAM
g. Hard disk drive
h.
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.
Chapter 7
.
Symptom-to-FRU index
67