Toshiba Satellite M640 Maintenance Manual page 50

2 Troubleshooting Procedures
Procedure 1: Diagnostic check
Procedure 2: Connector and replacement check
Procedure 1 Diagnostic check
test and Diagnostics
Run the
Tests and Diagnostics
Refer to Chapter 3,
If an error is located, go to Procedure 2. If an error does not occur, the keyboard is
functioning ok.
Procedure 2 Connector and replacement check
The keyboard and/or system board may be disconnected or damaged. Disassemble the
computer following the steps described in Chapter 4, Replacement Procedures and perform
the following checks.
Check 1 Make sure the keyboard cable is firmly connected to the system board.
If the connection is loose, reconnect firmly and repeat Procedure 1. If there is still
an error, go to Check 2.
Check 2 The keyboard may be damaged. Replace it with a new one following the
instructions in Chapter 4.
If the problem still exists, perform Check 3.
Check 3 The system board may be damaged. Replace it with a new one following the
instructions in Chapter 4.
Satellite/Satellite Pro M600/M640/M645/M647 Series/Dynabook TX/AX Series Maintenance Manual
Program, which will automatically execute the Keyboard Test.
for more information on how to run the program.
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