Toshiba PORTG R300 User Manual

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2  Troubleshooting Procedures 
PORTEGE R300 Maintenance Manual (960-591)  
[CONFIDENTIAL] 
2-21 
2.4 System 
Board 
Troubleshooting 
This section describes how to determine if the system board and CPU are defective or not 
functioning properly. Start with Procedure 1 and continue with the other procedures as 
instructed.  
The procedures described in this section are: 
Procedure 1:  Message Check 
Procedure 2:  Debugging Port Check (Boot Mode) 
Procedure 3:  Diagnostic Test Program Execution Check 
Procedure 4:  Replacement Check