Apple 5400/160 Benutzerhandbuch

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 Troubleshooting
Symptom Charts/Audio - 6
 
Crackling noise is 
present when 
playing sounds other 
than system beeps 
and not in “play 
through” mode
1 If static noise varies while adjusting volume with Sound 
control panel, use Audio Volume Extension 1.1 or later. 
 
Note:
 
  
Audio Volume Extension is available from standard Apple 
software update sites.
2 Replace logic board.