Sony PCV-RX690G Reference Manual

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Miscellaneous Technical Information
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Beep Code Error Messages 
During a normal bootup, a single short beep signifies that the system is 
OK. Other beep patterns signify errors. The number of beeps indicates the 
specific error that occurred. 
The Sony Online Support technical representative will need to know how 
many beeps your system produces if there is an error, so be sure to count 
the number of beeps before calling for support.