According to the BV8-40 servicemanual you should do the following to get access to the service menu:
The Service Menu must be activated while the TV SETUP menu is displayed.
From this initial state, the Service Menu is activated in the following way:
Beo4: the Service Menu is activated by pressing
0 0 GO within 3 s.
@Teletom
I got the service menu. Thank you very much.
I am very pleased with my BV 8-40.
Thank you again.
Alen