Panasonic BM-ET500 - Manual (Page 20)

20
The status indicator does not light up. The power of the control unit may be
turned off. (The control unit supply the
power to the unit.)
Third party external power may be off.
Confirm if the power of the control unit
is turned on. (Refer to the control unit's
operating instructions.)
This unit may be disconnected from the
control unit. Refer to the dealer or service person-
nel.
The buzzer level may be too low to be
heard. The buzzer does not sound. Adjust the buzzer level. (Refer to p.15.)