IBM 2640-60x, Hardware Maintenance Manual

Page: 38 / 110

Note: When the Fn key is pressed, a black square briefly
appears.
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 cable.
Ÿ
Replace the keyboard.
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)
If any of these devices do not work, reseat the cable
connector and repeat the failing operation.
If the problem does not recur, recheck the connector.
If the problem is not corrected, replace the device and then
the system board.
Memory Checkout
DIMM cards are available for increasing memory capacity.
Memory errors might stop system operations, show error
messages on the screen, or hang the system.
Use the following procedure to isolate memory problems.
Note: Make sure that the DIMM is fully installed into the
connector. A loose connection can cause an error.
See “Running the Diagnostics” on page 47 for details.
If memory problems occur intermittently, use the loop
option to repeat the test. When the test detects an error,
an error log is printed on the printer connected to the
parallel port. See “Displaying the Error Log” on page 48
for more information.
System Programs in Flash Memory:
System setup
programs and diagnostic tests are stored in the flash
memory.
DIMM Displayed Value
No DIMM installed 32192 KB
8 MB 40384 KB
16 MB 48576 KB
32 MB 64960 KB
64 MB 97728 KB
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IBM ThinkPad 560X (2640-60x, 70x) HMM