dynabook TECRA A40-J Series Maintenance Manual

Maintenance Manual (960-945) 2-20
Troubleshooting Procedures
The connection of 3G antenna cables (MAIN, AUX) may be
loose or connected connector is wrong. Connect 3G antenna
cable correctly to the 3G/LTE module. Then perform Procedure
1 again. If the problem still exists, perform Check 4.
Check 4
The USB board is connected to the system board with
FPC/FFC. The connection between them may be loose.
Connect each board and the cable firmly, and perform
Procedure 1 again. If the problem still exists, go to procedure 3.
2.11.3 Replacement Check
The SIM card or SIM tray may be defective or damaged. Replace it with a
new one following the instructions in Chapter 4, Replacement Procedures.
If the problem still exists, 3G/LTE module, antenna, USB board, FPC/FFC
or system board may be faulty. Disassemble the computer following the
steps described in Chapter 4, Replacement Procedures, and perform the
following checks:
Check 1
3G/LTE module may be defective or damaged. Replace it with a
new one following the instructions in Chapter 4, Replacement
Procedures and perform Procedure 1 again. If the problem still
exists, perform Check 2.
Check 2
USB board may be defective or damaged. Replace it with a new
one following the instructions in Chapter 4, Replacement
Procedures and perform Procedure 1 again. If the problem still
exists, perform Check 3.
Check 3
FPC/FFC may be defective or damaged. Replace it with a new
one following the instructions in Chapter 4, Replacement
Procedures and perform Procedure 1 again. If the problem still
exists, perform Check 4.
Check 4
Antennas may be defective or damaged. Replace them with new
ones following the instructions in Chapter 4, Replacement
Procedures and perform Procedure 1 again. If the problem still
exists, perform Check 5.
Check 5
System board may be defective or damaged. Replace it with a
new one following the instructions in Chapter 4, Replacement
Procedures.
2.12 Sound Troubleshooting
To check if the sound function is malfunctioning or not, follow the
troubleshooting procedures below as instructed.

dynabook TECRA A40-J Series Specifications

General

Brand	dynabook
Model	TECRA A40-J Series
Category	Laptop
Language	English