Lectrosonics MM400c User Manual download pdf (Page 8)

MM400C

LECTROSONICS, INC.

Controls and Functions

Preventing Internal Corrosion

It is very important that you properly dry the transmitter

when it becomes wet due to immersion or high levels of

perspiration BEFORE opening any covers or connec-

tors. Follow the procedure below for best results:

1. Carefully blot the transmitter dry with a clean paper

towel or cloth. Remove all moisture. After open-

ing any connector or cover, carefully blot up any

remaining moisture that may have remained around

the seal.

IMPORTANT!DONOTCLOSEANYCOVER

ORCONNECTORBEFOREMAKINGCERTAIN

THEREISNOMOISTUREINORNEARTHE

OPENING.

2. After use, it is important to store the transmitter

in a dry place with all access compartments and

connectors opened to allow any internal humidity to

evaporate.Specically,opentheBatteryCompart-

ment, the Frequency Switch Cover Plate and fully

unscrew and remove the microphone connector

before storing. Do not store wet and do not store

sealed. If moisture is sealed inside the unit it has

nowhere to go other than to chemically react with

and destroy components and the printed circuit

board.

3. LubricateallrubberO-ringswithpetroleumjelly

(suchasVaseline)aftereachuse(includedwith

transmitterandO-ringreplacementkits).DO NOT

USE ANYTHING OTHER THAN PURE PETRO-

LEUM JELLY. Silicone-based lubricants will dis-

solvetherubber.FailingtolubricatetheO-rings

after each use will signiﬁcantly shorten their life.

Power ON/OFF Switch

Awaterproof,magneticPowerON/OFFswitchis

located on the unit’s side panel. The switch actually

consists of two components. A magnetically actuated

internal component and a magnet housing assembly.

The switch is designed so that the unit will still operate

if the Switch Magnet Housing Assembly is missing or

removed.

ThefunctionofthePowerON/OFFSwitchcanalsobe

changed so it operates as an audio mute switch. (See

Operating Instructions, Power Switch Function Selec-

tion.)Thesefunctionsareillustratedinthechartbelow:

Power Switch Position

Function ON OFF

Normal,or AppliesPower TurnsUnitOff

Power Mode to Unit

AudioMute TurnsOnAudio MutesAudio

Mode

IftheMM400CPowerON/OFFSwitchhasbeencon-

ﬁgured for Audio Mute Mode, it is still possible to turn

off the transmitter without removing the battery. This

isdonebyplacingtheswitchintheONposition,then

togglingtheswitchbetweentheONandOFFposition

threetimesinlessthanveseconds,i.e.,ON(Starting

Position)-OFF-ON-OFF-ON-OFF.

Theuser-selectedcongurationofthePowerON/OFF

switch is stored in memory and persists until reconﬁg-

ured by the user.

Power LED

ThePWRLEDprovidesanindicationofthebattery’s

condition.ThePWRLEDglowsgreenwhenthebattery

is good. The color changes to red when there is about

30 minutes of operation left with the recommended

lithium battery. (An alkaline battery will have about 20

minutesoflifeleft.)WhentheLEDbeginstoblinkred,

there are only a few minutes of life left in the battery.

ThePWRLEDblinksredforashortperiodwhenthe

transmitter is conﬁgured for Normal Mode and the

PowerON/OFFswitchissettoOFF.Attheendofthe

poweroffsequence,thenPWRLEDextinguishes.

Note: A NiMH battery gives little or no warning

when it is depleted. If you use NiMH batteries in

the MM400C, we recommend trying fully charged

batteries ﬁrst, noting the length of time that the

batteries will run the unit, then plan for somewhat

less time to determine when the battery needs to

be replaced. Some Lectrosonics receivers have

timers for use with these batteries.

AweakbatterywillsometimescausethePWRLEDto

glow green immediately after being put in the unit, but

will soon discharge to the point where the LED will blink

red or shut off completely.

Microphone Jack

Frequency Select

SwitchThumbscrew

and Cover Plate

Audio Level Control

Antenna

Battery

Compartment

Cap

Power ON/OFF Switch

(ExternalSwitchMagnet

HousingAssemblyShown.)

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Lectrosonics MM400c User Manual Page 8

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