Lectrosonics M170XLR - Manual (Page 5)

CONTROLS AND FUNCTIONS
The MIC JACK is a locking micro jack that supplies "phantom power" for electret microphones such as
the Lectrosonics M130, M140 and the HM142V and HM152V headset models. Insert the microphone
cord plug into the jack and rotate it clockwise to lock it. It is important that the plug be securely locked,
since the microphone cord serves as the antenna for the transmitter.
The POWER ON/OFF switch turns the power on and off. The switch should be left in the off position
when the transmitter is not in use. When the switch is in the on position, the battery will be drained
even though the transmitter is not being used. The ON/OFF switch on the M170-CTM is located on the
bottom of the unit.
The BATTERY INDICATOR LAMP will light when the transmitter is turned on and will stay lit as long
as the battery is good. As the battery voltage drops, the lamp will grow dim and finally go out. Turn
the M170-CTM upside down to check the battery lamp.
The THUMBSCREW is turned counter-clockwise to remove the side cover to allow battery replacement.
The GAIN ADJUST is a recessed screwdriver adjustment used to match the gain of the transmitter to
different microphones, individual voices or other audio inputs such as tape deck outputs. The gain
adjust hole on the M170-CTM is located in the walnut body along the back side of the unit.
The AUDIO MUTE SWITCH (M170-LS only) is a toggle type on-off switch used to shut off the audio
signal without shutting off the RF carrier of the transmitter. To turn the sound on, push the switch
handle toward the microphone jack. This feature is useful for users who may want to converse with
someone close at hand without the main audience hearing the remarks.
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