Toshiba Portege R300 Maintenance Manual page 98

2 Troubleshooting Procedures
Procedure 2 Antenna Connection Check
The wireless LAN wiring diagram is shown below:
Any of the connections may be disconnected. Disassemble the computer following the steps
described in Chapter 4, Replacement Procedures, and perform the following checks:
Check 1 Make sure the wireless LAN card is firmly connected to CN2600 on the system
board.
If the connector is disconnected, connect it firmly and go to Procedure 1. If the
wireless LAN card is still not functioning properly, perform Check 2.
Check 2 Make sure the wireless LAN antenna cables are firmly connected to the wireless
LAN card.
If the wireless LAN antenna cables are disconnected, connect them firmly and go
to Procedure 1. If the wireless LAN card is still not functioning properly, go to
Procedure 3.
Procedure 3 Replacement Check
The wireless LAN antenna, wireless LAN card and the system board are connected to the
circuits. Any of these components may be damaged. Refer to Chapter 4, Replacement
Procedures, for instructions on how to disassemble the computer and then perform the
following checks:
Check 1 The wireless LAN card may be defective or damaged. Replace it with a new one
following the steps in Chapter 4, Replacement Procedures. If the problem still
exists, perform Check 2.
Check 2 The wireless LAN antenna may be defective or damaged. Replace the antenna
with a new one following the steps in Chapter 4, Replacement Procedures. If the
problem still exists, perform Check 3.
Check 3 The system board may be defective or damaged. Replace the board with a new
one following the instructions in Chapter 4, Replacement Procedures and test the
display again.
2-56 [CONFIDENTIAL] PORTEGE R300 Maintenance Manual (960-591)