Apple emac ati usb2 2005 서비스 매뉴얼

eMac ATI Graphics /USB 2.0/2005  Troubleshooting - 43

Sound Out Symptom Charts

1.

Verify volume setting is correct in system preferences.

2.

Verify the computer is not set to “mute”. Press the mute key on the Apple keyboard.

3.

Reset parameter RAM. Press Command-Option-P-R during startup.

4.

Boot from Apple Hardware Test (hold down the “C” key at startup). Run both quick and extended tests. 

Proceed based on any error codes given. See AppleCare Knowledge Base article 112125 - Service 

Diagnostics Matrix for Error Code information.

5.

Test the computer with known-good headphones. Do you get sound? If yes, go on to step 6. If no, 

replace the main logic board.

6.

Verify that the speaker cable is connected.

7.

Replace the speaker assembly.

8.

Replace the logic board.

1.

Verify the problem with known-good headphones.

2.

Verify the computer is not set to “mute”. Press the mute key on the Apple keyboard.

3.

Verify volume setting is correct in Mac OS X system preferences. If the preferences are set correctly, 

replace the logic board.

4.

In Mac OS 9, check the Sound Control panel, Speakers tab. When headphones are connected, a 

headphone icon will be present. If the headphone jack is malfunctioning it may indicate that headphones 

are connected when none are connected. In this case, replace the logic board.