Справочник Пользователя для Apple LATE 2009

Mac mini (Late 2009) Symptom Charts — Input/Output Devices 

 2009-11-03

No audio from one or both 

• 

speakers.
Audio from speakers distorted

• 

Launch System Preferences and select Sound/

Output options. Verify that the sound output 

option is set to system’s internal speakers and 

that the balance control is set to the center 

position. 
Obtain known good high quality sound file 

or use iTunes music store sound samples to 

evaluate sound quality. Verify suspect sound files 

on another system to determine whether the 

distortion is caused by the system or the sound 

file.
Set volume control to mid-range. Overdriving the 

built-in speakers can cause distortion.

Launch System Preferences and 

select Sound/Output options. 

Set speaker balance to the 

middle, then play a sound file. 

Verify that sound is generated 

by the speaker and that the 

sound quality is acceptable.

Yes

 Speaker and amplifier 

circuitry OK. Go to step 3.

No

Distortion detected in 

speaker. Go to step 2

Connect external speakers or 

headphones to Headphone 

Out port then play a sound 

file. Verify that sound quality is 

acceptable.

Yes

Suspect bad speaker. Go to 

step 3.

No

Audio CODEC or amplifier 

issue suspected. Replace 

audio board. Retest.

Inspect speaker cones and 

speaker connection cable for 

damage. Does the speaker have 

visible damage.

Yes

Replace damaged speaker. 

Retest.

No

Go to step 4.