Epson SQ-B50/2550 Technical Manual page 57

1.4.1.5 Buzzer
The buzzer rings as follows:
When the BEL code of the ESC command is input:
When an ink-end is detected:
When paper-out is detected:
When the cover-open state is detected:
When an error is detected:
When the printer enters the SelecType mode:
During the TOF position adjustment
(at 8.5 mm and 22 mm positions):
1-43
! x specified times
! ! ! (five times)
! (three times)
! ! ! (five times)
! (five times)
REV.-A