2.15 Sound Troubleshooting 2 Troubleshooting Procedures
2-56 PORTEGE M300 Maintenance Manual (960-504)
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 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 5.
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 5.
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 5.
Check 4 Speaker may be faulty. Replace it with a new one following the steps in Chapter
4. If the problem still occurs, perform Check 5.
Check 5 System board may be faulty. Replace it with a new one following the instructions
in Chapter 4.