Toshiba Portege R300 Maintenance Manual page 101

Procedure 3 Replacement Check
Check 1 If the speakers do not sound properly, the speaker may be defective or damaged.
Replace it with a new one. If the speakers still do not work properly, go to Check
3.
Check 2 If the Built in microphone do not sound properly, the Built in microphone may be
defective or damaged. Replace it with a new one. If the Built in microphone still
do not work properly, go to Check 3.
Check 3 If the headphone or external microphone does not sound properly, the system
board may be defective or damaged. Replace the system board with a new one.
PORTEGE R300 Maintenance Manual (960-591)
2 Troubleshooting Procedures
[CONFIDENTIAL] 2-59