IBM 560E - ThinkPad 2640 - Pentium MMX 166 MHz, Hardware Maintenance Manual

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System Board Checkout
The processing functions are performed by the system
board. When a numeric code calls the system board as a
FRU, 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 “Checkout Guide” on page 29.
2. If FRU code 10 appears, replace the system board.
3. Rerun the test to verify the fix.
If this procedure does not correct the problem, go to
“Undetermined Problems” on page 51.
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 flexible cable
extending from the keyboard is correctly seated in the
connector on the subcard.
If the keyboard cable connection is correct, run the
keyboard test by doing the following:
1. Go to the diagnostic menu screen by selecting Test
in the Easy-Setup screen.
2. Press Ctrl
+
A. The ThinkPad FRU Connections
screen appears. (If the Ctrl
+
A does not work,
triple-click on the icon on the right bottom corner on
the basic diagnostic screen.)
3. Make sure that the keyboard connection is
Connected; then press Esc to escape the screen.
4. A layout of the keyboard appears on the screen.
Check that when each key is pressed, the key's
position on the keyboard layout on the screen
changes to a black square.
Note: When a Fn key is pressed, a black square
briefly appears.
5. Press Ctrl
+
Pause to end the test.
If the tests detect a keyboard problem, do the following
one at a time to correct the problem. Do not replace a
nondefective FRU.
Ÿ
Reseat the keyboard flexible cable.
Ÿ
Replace the keyboard assembly.
Ÿ
Replace the subcard.
Ÿ
Replace the system board.
The following auxiliary input devices are supported for this
computer:
Ÿ
Numeric keypad
Ÿ
Mouse (PS/2 compatible)
Ÿ
External keyboard (with keyboard/mouse cable)
ThinkPad 380, 385 (2635)
31