Lectrosonics FM870 - Manual (Page 4)

CONTROLS AND FUNCTIONS
POWER/FUNCTION: A rotary switch which turns the power off and on and selects the operating mode.
OPERATE: Set in this position for normal use when the built-in speaker is to be used.
SPEAKER OFF: Set in this position for use with the FM870 plugged into the house sound system.
The wireless microphone will operate, but the sound from the built-in speaker will
be muted.
CHARGE: Set in this position to recharge the built-in battery pack.
POWER LED: A red LED indicates when the FM870 is turned on and the batteries are charged
up enough to operate the system. This LED will also light up when the batteries
are being recharged if the CH-40 charger is properly connected.
RF LED: A green LED lights when the companion transmitter is turned on and there is
sufficient signal for good system operation. Internal circuits monitor both signal
level and interference levels and decide if the transmitted signal is strong and
"clean" enough for satisfactory operation. If not, the RF lamp will go out and the
receiver will "squelch", shutting off the sound output. This action is automatic and
requires no user adjustment.
MODULATION: The -20 and LIMIT LEDs continuously indicate the modulation level (audio level)
of the received signal from the transmitter and are used when making initial
adjustments to the transmitter.
See items 10 and 11 in the section on
"OPERATING INSTRUCTIONS" on page 10.
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