Toshiba QOSMIO G20 Maintenance Manual page 109

2 Troubleshooting Procedures
Procedure 3 Replacement Check
If external microphone does not work properly, perform check 1.
If headphone does not work properly, perform check 2.
If internal microphone does not work properly, perform check 3.
If speaker (L) does not work properly, perform check 4.
If speaker (R) does not work properly, perform check 4.
Check 1 External microphone may be faulty. Replace it with a new one following the steps
in Chapter 4. If the problem still occurs, perform Check 6.
Check 2 Headphone may be faulty. Replace it with a new one following the steps in
Chapter 4. If the problem still occurs, perform Check 6.
Check 3 Internal microphone may be faulty. Replace it with a new one following the steps
in Chapter 4. If the problem still occurs, perform Check 6.
Check 4 Speaker (L) may be faulty. Replace it with a new one following the steps in
Chapter 4. If the problem still occurs, perform Check 7.
Check 5 Speaker (R) may be faulty. Replace it with a new one following the steps in
Chapter 4. If the problem still occurs, perform Check 9.
Check 6 SJ board may be faulty. Replace it with a new one following the instructions in
Chapter 4. If the problem still occurs, perform Check 7.
Check 7 SD board may be faulty. Replace it with a new one following the instructions in
Chapter 4. If the problem still occurs, perform Check 8.
Check 8 Harnesses among SJ board, SD board and system board may be faulty. Replace it
with a new one following the instructions in Chapter 4. If the problem still occurs,
perform Check 9.
Check 9 System board may be faulty. Replace it with a new one following the instructions
in Chapter 4.
QOSMIO G20 Maintenance Manual (960-511)
2.15 Sound Troubleshooting
2-65