Sony PCV-RXP-RZP - Manual (Page 83)

Miscellaneous Technical Information 69
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.
If a system error occurs, the Sony Online Support technicians require the
number of beeps your system produces.