Toshiba Satellite M640 Maintenance Manual page 92

2Troubleshooting Procedures
Procedure 2:
Connector and replacement check
The 3G antenna, 3G unit or system board may be disconnected or damaged. Disassemble the
computer following the steps described in Chapter 4, Replacement Procedures , and perform
the following checks.
Check 1 Make sure that the 3G antenna is firmly connected to the 3G module (refer to
Chapter 4 for instructions) and that the 3G module is securely slotted into the
system board. If the problem persists, go to Check 2.
Check 2 Check the wireless communication function is enabled by BIOS setup and
FN+F8, and then make sure that the wireless communication LED on the front
panel is light. If the LED is light but the 3G function is still faulty, the antenna
may be damaged. Replace with a new antenna following the steps in Chapter 4,
Replacement Procedures . If the problem persists, or if the wireless LAN LED is
not light when the wireless communication function is enabled by BIOS setup and
FN+F8, go to Check 3.
Check 3 3G unit may be damaged. Replace it with a new one following the instructions in
Chapter 4. If the problem still exists, perform Check 4.
Check 4 The system board may be damaged. Replace it with a new one following the
instructions in Chapter 4.
Satellite/Satellite Pro M600/M640/M645/M647 Series/Dynabook TX/AX Series Maintenance Manual 60