Toshiba Satellite Pro U300 Maintenance Manual - Page 97

LAN Troubleshooting

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Troubleshooting Procedures 2.12 LAN Troubleshooting To check if the computer's LAN is malfunctioning or not, follow the troubleshooting procedures below as instructed. Procedure 1: Diagnostic Test Program Execution Check Procedure 2: Connector Check and Replacement Check Procedure 1 Diagnostic Test Program Execution Check Execute LAN test in the LAN/Modem test program. Refer to Chapter 3, Tests and Diagnostics for more information on how to perform the test program. If any error is detected by the test, go to Procedure 2. Procedure 2 Connector Check and Replacement Check The LAN function is embedded on system board. If LAN malfunctions, its connection is defective or LAN cable and system board may be faulty. Check 1 Make sure LAN cable is firmly connected to the connector CN9. If the problem still occurs, perform Check 2. Check 2 LAN cable may be faulty. Replace it with a new one. If the problem still occurs, perform Check 3. Check 3 System board may be faulty. Replace it with a new one following the instruction in Chapter 4. Satellite U300 and Satellite Pro U300 Maintenance Manual 45

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Troubleshooting Procedures
2.12
LAN Troubleshooting
To check if the computer’s LAN is malfunctioning or not, follow the troubleshooting
procedures below as instructed.
Procedure 1:
Diagnostic Test Program Execution Check
Procedure 2:
Connector Check and Replacement Check
Procedure 1
Diagnostic Test Program Execution Check
Execute LAN test in the LAN/Modem test program. Refer to Chapter 3,
Tests and Diagnostics
for more information on how to perform the test program.
If any error is detected by the test, go to Procedure 2.
Procedure 2
Connector Check and Replacement Check
The LAN function is embedded on system board. If LAN malfunctions, its connection is
defective or LAN cable and system board may be faulty.
Check 1
Make sure LAN cable is firmly connected to the connector CN9. If the problem
still occurs, perform Check 2.
Check 2
LAN cable may be faulty. Replace it with a new one. If the problem still occurs,
perform Check 3.
Check 3
System board may be faulty. Replace it with a new one following the instruction in
Chapter 4.
Satellite U300 and Satellite Pro U300
Maintenance Manual
45