Toshiba PORTEGE M400 - Manual (Page 98)

2 Troubleshooting 2.14 Sound Troubleshooting
2.14 Sound Troubleshooting
To check if the sound function is defective or malfunctioning, follow the troubleshooting
procedures below as instructed.
Procedure 1: Diagnostic Test Program Execution Check
Procedure 2: Connector Check
Procedure 3: Replacement Check
Procedure 1 Diagnostic Test Program Execution Check
Execute the Sound test program available as part of the maintenance test program. See
Chapter 3 for information on how to perform the test.
If any error is detected by the test, go to Procedure 2
Procedure 2 Connector Check
The speaker, internal microphones, external microphone and headphone are connected to the
System board shown in the following figure. These connections may be loose or cables may
come off. Disassemble the computer referring to the steps described in Chapter 4 and make
sure each connection. If there is still an error, perform Procedure 3.
Procedure 3 Replacement Check
Check 1 If the speaker or headphone is not working properly, it may be faulty. Replace it
with a new one. If there is still an error, perform Check 2.
Check 2 If the external microphone, internal microphone (L) or internal microphone (R) is
not working properly, it may be faulty. Replace it with a new one following the
step in Chapter 4. If there is still an error, go to Check 3.
Check 3 The System board may be faulty. Replace it with a new one following the step in
Chapter 4.
2-50 [CONFIDENTIAL] PORTEGE M400 Maintenance Manual (960-541)