Toshiba TECRA S1 - Manual (Page 60)

2.7 Keyboard 2 Troubleshooting
TECRA S1 Maintenance Manual 2-23
2.6 Keyboard
To check if the computer’s keyboard is defective or malfunctioning, follow the
troubleshooting procedures below as instructed.
Procedure 1 External Keyboard Check
Procedure 2 Test Program Check
Procedure 3 Connector Check and Replacement Check
Procedure 1 External Keyboard Check
Connect a PS/2 or compatible keyboard to the computer's PS/2 keyboard/mouse port, then
boot the computer. The computer automatically detects the external keyboard even if resume
mode is enabled.
If the external keyboard works correctly, the internal keyboard may be faulty. Go to
Procedure 3.
If the external keyboard appears to have the same problem as the internal keyboard, the
system board may be faulty. Go to Procedure 2.
Procedure 2 Test Program Check
Execute the Keyboard test available as part of the maintenance test program. See Chapter 3
for information on how to perform the test.
If an error is detected in the test, go to Procedure 3. If no error is detected, the keyboard
itself is normal.
Procedure 3 Connector Check and Replacement Check
The keyboard or system board may be disconnected or faulty. Disassemble the computer
following the steps described in Chapter 4 and perform the following checks:
Check 1
Make sure the keyboard cable has been firmly connected to the system board.
Keyboard System board CPU
If the cable is loose or off, reconnect it firmly and return to Procedure 2. If
there is still an error, perform Check 2.
Check 2
The keyboard may be faulty. Replace it with a new one following the
instructions in Chapter 4. If the problem persists, perform Check 3.