SRS-X77 - Sony Audio Service Manual (repair manual). Page 4

THE  USER  REGISTRATION  DELETION  METHOD  OF  
SEN  SERVICE
By checking device ID, user registration of the SEN service of this 
unit can be force reset.
(Device ID is “the hexadecimal numbers of 12 digits”)
When this unit needs force reset, check device ID and consult with 
the service headquarters.

Procedure:
1.  Check the device ID label stuck on the bottom side of the unit.
2.  Record the device ID indicated on the device ID label by the 

memorandum etc.

 

(Device ID is “the hexadecimal numbers of 12 digits”)

Device ID:  XXXXXXXXXXXX
MAC1 :XX-XX-XX-XX-XX-XX
MAC2 :XX-XX-XX-XX-XX-XX

.