Toshiba PORTEGE R400 Maintenance Manual page 89

Procedure 2 Antenna Connection Check
The 3G 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 3G antenna cables are firmly connected to the 3G card.
If the 3G antenna cables are disconnected, connect them firmly and go to
Procedure 1. If the 3G card is still not functioning properly, go to Check 2
Check2 Make sure the 3G card is firmly connected to CN2610 on the USB/JACK/3G/SIM
board. If the connector is disconnected, connect it firmly and go to Procedure 1. If
the 3G card is still not functioning properly, perform Check 3.
Check3 Make sure the MJ board cable is securely connected to CN9500 on the system
board and CN9600 on the USB/JACK/3G/SIM board. If the cable is disconnected,
connect it firmly and go to Procedure 1. If the 3G card is still not functioning
properly, perform Procedure 3.
Procedure 3 Replacement Check
The 3G antenna, 3G card, USB/JACK/3G/SIM board and the system board are connected to
the circuits. Any of these components may be damaged. Refer to Chapter 4, Replacement
Procedures, for instructions how to disassemble the computer and then perform the
following checks:
Check 1 The 3G 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.
PORTEGE R400 Maintenance Manual (960-623)
2 Troubleshooting Procedures
[CONFIDENTIAL] 2-51