Apple MC408LL Apple Technician Guide - Page 67

Audio: Built-in Speaker Has Distorted Sound, Symptoms, Quick Check, Audio: Built-in Speakers

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4. Open the Apple System Profiler. Yes IR Receiver reporting on USB Selecting USB, do you see "IR bus. Check for IR cable. Go to Receiver" listed? step 5 No Remove bottom cover, and fan, and reseat the IR sensor connection to logic board. X03 Replace any damaged IR sensor cable assembly. Go to step 5. 5. Remove bottom cover, Yes Take apart system to access X13 disconnect AirPort antenna the IR lens and sensor ,and and remove shield, disconnect verify that they are correctly and remove fan and cowling, installed and not blocked then disconnect IR/LED sensor by any foreign element. If cable and connect a known- correctly installed, replace IR good sensor assembly to logic sensor cable assembly. board to verify that IR sensor functionality is restored. No Replace logic board (IR M99 controller is located on logic board). Audio: Built-in Speaker Has Distorted Sound Quick Check Symptoms Audio: Built-in Speakers Have Distorted Sound • No audio from built-in speaker. • Audio from speaker is distorted Quick Check 1. Launch System Preferences and select Sound/ Output options. Verify that the sound output option is set to system's internal speaker and that the balance control is set to the center position. 2. 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. 3. Set volume control to mid-range. Overdriving the built-in speaker can cause distortion. 2010-08-03 Mac mini (Mid 2010) Symptom Charts - Input/Output Devices 67

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Mac mini (Mid 2010) Symptom Charts — Input/Output Devices
67
2010-08-03
4.
Open the Apple System Profiler.
Selecting USB, do you see “IR
Receiver” listed?
Yes
IR Receiver reporting on USB
bus. Check for IR cable. Go to
step 5
No
Remove bottom cover, and
fan, and reseat the IR sensor
connection to logic board.
Replace any damaged IR
sensor cable assembly. Go to
step 5.
X03
5.
Remove bottom cover,
disconnect AirPort antenna
and remove shield, disconnect
and remove fan and cowling,
then disconnect IR/LED sensor
cable and connect a known-
good sensor assembly to logic
board to verify that IR sensor
functionality is restored.
Yes
Take apart system to access
the IR lens and sensor ,and
verify that they are correctly
installed and not blocked
by any foreign element. If
correctly installed, replace IR
sensor cable assembly.
X13
No
Replace logic board (IR
controller is located on logic
board).
M99
Audio: Built-in Speaker Has Distorted Sound
Quick Check
Symptoms
Quick Check
Audio: Built-in Speakers Have
Distorted Sound
•
No audio from built-in speaker.
•
Audio from speaker is distorted
1.
Launch System Preferences and select Sound/
Output options. Verify that the sound output
option is set to system’s internal speaker and that
the balance control is set to the center position.
2.
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.
3.
Set volume control to mid-range. Overdriving the
built-in speaker can cause distortion.