Toshiba Tecra M2-S519 Maintenance Manual - Page 100

2 Troubleshooting Procedures 2.11 LAN Troubleshooting 2.11 LAN Troubleshooting This section describes how to determine if the computer's LAN is functioning properly. Perform Procedure 1. Procedure 1: Connector Check and Replacement Check Procedure 1 Connector Check and Replacement Check The RJ45 jack with LAN cable is connected to the system board. If the LAN malfunctions, the system board might be damaged. Disassemble the computer following the steps described in Chapter 4, Replacement Procedures and perform the following check: Check 1 Make sure the RJ-45 jack is firmly connected to PJ4100 on the system board. If the connector is disconnected, connect it firmly and repeat Procedure 1. If the LAN port is still not functioning properly, perform Check 2. Check 2 The RJ-45 jack may be defective or damaged. Replace the RJ-45 jack with a new one. If the LAN port is still not functioning properly, perform Check 3. Check 3 The system board may be defective or damaged. Replace the system board with a new one following the steps in Chapter 4, Replacement Procedures. 2-46 TECRA M2 Maintenance Manual (960-468)