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2. Get the appropriate diskette which contains the
update.
3. Insert the System Program Service Diskette into
drive A and power-on the computer.
4. Select Update system programs from the menu.
System Board and Processor Card
Checkout (370C, 750Ce, 755C, 755Cs)
The processing functions for the Models 370C, 750C,
755Ce, and 755Cs are performed by both the system
board and the processor card. Processor problems can be
caused by either FRU. However, the processor card
generally has a lower probability of failure. When a
numeric code calls the system board or the processor card
as a FRU, or the processor card is called by a diagnostic
test by showing FRU code 11, use the following procedure
to isolate the problem.
1. Run the system board test to verify the symptom.
This test verifies both the system board and the
processor card. If no error is detected, return to
"General Checkout" on page 200.
2. If FRU code 10 appears, replace the system board
but do not replace the processor card. Transfer the
processor card from the old system board to the new
system board.
3. If FRU code 11 appears, reseat the processor card.
4. Rerun the test to verify the fix.
5. If FRU code 11 remains, replace the processor card.
If above procedure does not correct the problem, go to
"Undetermined Problems" on page 227.
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 interposer card.
If the keyboard cable connection is correct, run the
Keyboard Test by doing the following:
1. Go to diagnostic menu screen by pressing Ctrl+A in
Easy-Setup screen.
2. Press Ctrl+K; the figure 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 be a black square.
Note: When a Fn key is pressed, the black square
briefly appears.
ThinkPad 355x, 360x, 370C, 750x, 755C, 755Cs
203
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