2 Troubleshooting Procedures
dynabook PORTEGE A30-E/TECRA A30-G,-J/dynabook S Series Maintenance Manual(960-931) [CONFIDENTIAL] 2-23
2.7 Keyboard Troubleshooting
To check if the computer’s keyboard is malfunctioning or not, follow the troubleshooting
procedures below as instructed.
Procedure 1: Diagnostic Test Program Execution Check and Check on Windows
Procedure 2: Connector Check and Replacement Check
2.7.1 Procedure 1 Diagnostic Test Program Execution Check and Check
on Windows
Execute the Keyboard Test in the Diagnostic Program. Refer to Chapter 3, Tests and
Diagnostics, for more information on how to perform the test program.
To check the keyboard backlit, press
Fn+Z after starting Windows. By repeating the key
operation twice, turn-on and –off of the keyboard illumination function can be checked.
If an error occurs, go to Procedure 2. If an error does not occur, keyboard is functioning
properly.
2.7.2 Procedure 2 Connector Check and Replacement Check
The connection between the keyboard and system board may be loosening. Or the keyboard or
system board may be faulty. Disassemble the computer following the steps described in
Chapter 4, Replacement Procedures, and perform the following checks:
Check 1 Make sure keyboard cable is firmly connected to the connectors on both the system
board and keyboard.
If any connection is loose, reconnect firmly and repeat Procedure 1. If the problem
still occurs, go to Check 2.
Check 2 Keyboard may be faulty. Replace it with a new one following the instructions in
Chapter 4, Replacement Procedures. If the problem still occurs, perform Check 3.
Check 3 System board may be faulty. Replace it with a new one following the instructions
in Chapter 4, Replacement Procedures.
System board
Keyboard
CN3240
Keyboard I/F
CN3280
KB Backlight I/F
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