Sennheiser EM 3731 Notice D'emploi page 60

Indications and displays
12
LEDs for booster supply of antenna inputs
The LEDs for booster supply of antenna input A
the booster supply voltage is applied to the corresponding antenna
O R
input A or B .
The LEDs for booster supply of antenna input A
the booster supply voltage for the corresponding antenna input A
R
or B is switched off or
the booster supply voltage is short-circuited or overloaded.
N S
or B light up when
N S
or B go off when
O