Toshiba PORTEGE R830 Maintenance Manual page 105

Troubleshooting Procedures
Procedure 2 Replacement Check k
The 3G wiring diagram is shown below:
The 3G antenna, 3G 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
how to disassemble the computer and then perform the following checks:
Check 1 SIM 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 1 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.
Check 2 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 3GS/SIM board(FAL3G*）or the FPC( FAL3Y3*) may be damaged. Replace
it with a new one following the instructions in Chapter 4, Replacement Procedures.
If the problem still exists, perform Check 4
Check 4 System board may be faulty. Replace it with a new one following the step in
Chapter 4 Replacement Procedures.
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PORTEGE R830 Satellite R830 Series Maintenance Manual (960-880) [CONFIDENTIAL]