Lan Troubleshooting - Toshiba libretto U100 Maintenance Manual

2.11 LAN Troubleshooting

2.11 LAN Troubleshooting
This section describes how to determine if the computer's LAN is functioning properly.
Perform the steps below starting with Procedure 1 and continuing with the other procedures
as required.
Procedure 1: Diagnostic Test Program Execution Check
Procedure 2: Connector Check and Replacement Check
Procedure 1 Diagnostic Test Program Execution Check
The LAN/Modem/Bluetooth/IEEE1394 test program is stored in the Diagnostics Disk.
For the test, prepare a test LAN/Modem/Bluetooth/IEEE1394.
Then insert the Diagnostics Disk in the computer's floppy disk drive, turn on the computer
and run the test. Refer to Chapter 3, Tests and Diagnostics, for more information about the
diagnostics test procedures.
If any errors occur while executing the test, go to Procedure 2.
Procedure 2 Connector Check and Replacement Check
A RJ45 jack with LAN cable is connected to the connector CN4100 on the System Board. If
the LAN malfunctions, the connections may loose or the LAN cable, LAN harness or,
System Board might be damaged.
Disassemble the computer following the steps described in Chapter 4, Replacement
Procedures.
Check 1 Make sure the following connections are secure. If any connection is loose, secure
the connection. If the LAN is still not functioning properly, perform Check 2
libretto U100 Maintenance Manual (960-520)
2 Troubleshooting Procedures
[CONFIDENTIAL] 2-49