IBM 2621421 Hardware Maintenance Manual - Page 122

Keyboard and External Input Device Check, board test by doing the following

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DIMM 128MB 64MB 128MB DIMM 64MB 128MB 128MB Total Memory 192MB 192MB 256MB CAUTION: This system cannot work without DIMM memory. Memory errors might stop system operation, 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 properly installed into the connector. A loose connection can cause an error. 1. Power off the computer and replace the DIMM. 2. Boot from the diagnostics diskette and start the PC Doctor program (please refer to "Running the PC Doctor Diagnostics Program" on page 135). 3. Run the Memory item to run the memory test. If no error appears, install a new DIMM; if an error appears, replace the system board. Keyboard and External Input Device Check Note: If an external keyboard is attached, remove it if the internal keyboard has 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 TrackPoint board. If the tests do not detect a keyboard problem, run the keyboard test by doing the following: 1. Boot from the diagnostics diskette and start the PC Doctor program (please refer to "Running the PC Doctor Diagnostics Program" on page 135). 2. Select Interactive Tests. 3. Select Keyboard. 4. Follow the instructions in the message window. If the test detects a keyboard problem, do the following one at a time to correct the problem. Do not replace a nondefective FRU. Ensure the keyboard type switch is correctly set. See "Switch Locations" on page 180. Reconnect the keyboard flexible cables. Replace the TrackPoint board. Replace the keyboard. 114 ThinkPad i Series 1400 HMM

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CAUTION:
This system cannot work without DIMM memory.
Memory errors might stop system operation, 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 properly installed into
the connector. A loose connection can cause an
error.
1.
Power off the computer and replace the DIMM.
2.
Boot from the diagnostics diskette and start the PC
Doctor program (please refer to “Running the PC
Doctor Diagnostics Program” on page
135).
3.
Run the
Memory
item to run the memory test.
If no error appears, install a new DIMM; if an error
appears, replace the system board.
DIMM
DIMM
Total Memory
128MB
64MB
192MB
64MB
128MB
192MB
128MB
128MB
256MB
Keyboard and External Input Device
Check
Note:
If an external keyboard is attached, remove it if the
internal keyboard has 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 con-
nector on the TrackPoint board.
If the tests do not detect a keyboard problem, run the key-
board test by doing the following:
1.
Boot from the diagnostics diskette and start the PC
Doctor program (please refer to “Running the PC
Doctor Diagnostics Program” on page
135).
2.
Select
Interactive Tests
.
3.
Select
Keyboard
.
4.
Follow the instructions in the message window.
If the test detects a keyboard problem, do the following
one at a time to correct the problem. Do not replace a non-
defective FRU.
±
Ensure the keyboard type switch is correctly set. See
“Switch Locations” on page
180.
±
Reconnect the keyboard flexible cables.
±
Replace the TrackPoint board.
±
Replace the keyboard.
114
ThinkPad i Series 1400 HMM