System Board
The processing functions for the computer are performed
by the system board. When a numeric code calls out the
system board, use the following procedure to isolate the
problem.
1. Run the system board test to verify the symptom.
This test verifies the system board. If no error is
detected, return to “General Checkout” on page 25.
2. If FRU code 10 appears, replace the system board.
3. Rerun the test to verify the fix.
If above procedure does not correct the problem, go to
“Undetermined Problems” on page 42.
Keyboard/Auxiliary Input Device
Checkout
Remove the external keyboard if the internal keyboard is to
be tested.
If the internal keyboard does not work or an unexpected
character appears, make sure that the three flexible cables
extending from the keyboard are correctly seated in the
connectors on the system board.
If the keyboard cable connection is correct, run the
Keyboard Test by doing the following:
1. Go to advanced diagnostic menu screen by pressing
Ctrl+A in the basic diagnostic menu.
2. Press Ctrl+K; a layout of the keyboard appears on
the screen.
3. Check that when each key is pressed, the key
position on the keyboard layout on the screen
changes to a black square.
Notes:
a. When a Fn key is pressed, a black square briefly
appears.
b. Press the Esc key to return to the diagnostic
menu.
If the tests detect a keyboard problem, do the following
one at a time to correct the problem. Do not replace a
non-defective FRU.
Reseat the three cables.
Replace the keyboard.
Replace the system board.
The following auxiliary input devices are supported for this
computer.
Numeric keypad
Mouse (PS/2 compatible)
External keyboard (with keyboard/mouse cable)
ThinkPad 340x (IBM 2610)
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