Toshiba PORTEGE R400 Maintenance Manual page 90

2 Troubleshooting Procedures
Check 2 The 3G antennas may be defective or damaged. Replace the antennas with new
ones following the steps in Chapter 4, Replacement Procedures. If the problem
still exists, perform Check 3.
Check 3 The USB/JACK/3G/SIM board may be defective or damaged. Replace the
USB/JACK/3G/SIM board with a new one following the steps in Chapter 4,
Replacement Procedures. If the problem still exists, perform Check 4
Check 4 The system board may be defective or damaged. Replace the board with a new
one following the instructions in Chapter 4, Replacement Procedures.
2-52 [CONFIDENTIAL] PORTEGE R400 Maintenance Manual (960-623)