background image

MM400C

LECTROSONICS, INC.

8

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.  Specifically, 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 five seconds, i.e., ON (Starting 

Position)-OFF-ON-OFF-ON-OFF. 
The user-selected configuration 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

Modulation and

Power LEDs

Audio  Level Control

Antenna

Battery 

Compartment 

Cap

Power ON/OFF Switch 

(External Switch Magnet 

Housing Assembly Shown.)

Содержание MM400C

Страница 1: ...C Watertight Miniature UHF Belt Pack Transmitter Featuring Digital Hybrid Wireless Technology INSTRUCTION MANUAL Rio Rancho NM USA www lectrosonics com Fill in for your records Serial Number Purchase...

Страница 2: ...MM400C LECTROSONICS INC 2...

Страница 3: ...e for use with modern electret lavaliere microphones Multi color LEDs are provided to make input gain adjustments quick and accurate without having to view the receiver The battery compartment accepts...

Страница 4: ...MM400C LECTROSONICS INC 4...

Страница 5: ...8 Power ON OFF Switch 8 Power LED 8 Mic Jack 9 Audio Level 9 Modulation LEDs 9 Frequency Select Switches 9 Antenna 9 Belt Clip 9 Battery Installation 10 Operating Instructions 11 Selecting the Compati...

Страница 6: ...ng the audio in the transmitter and decoding it in the receiver yet still sending the encoded informa General Technical Description tion via an analog FM wireless link This proprietary algorithm is no...

Страница 7: ...tem uses an ultrasonic tone between 25 and 32 kHz to operate the receiver squelch The pilot tone squelch system keeps the receiver muted until it receives the pilot tone from the matching trans mitter...

Страница 8: ...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...

Страница 9: ...and the switch is configured for Audio Mute Mode 10 and 20 LEDs operate normally to indicate audio level Mic Jack 330pF 330pF FB FB 100 2k 2k 30uF 6V Mic Bias To Mic Amp 2k 2 2nF Frequency Select Swit...

Страница 10: ...your receiver manual to determine if this function is available Alkaline batteries provide about 1 75 hours of operation with some warning Lithium batteries can be used to provide over 6 hours of oper...

Страница 11: ...tter off and leave the receiver turned on Scan across the frequency band to find a frequency where little or no RF activity is dis played Set both the transmitter and the receiver to this new frequenc...

Страница 12: ...he O ring and allow moisture to enter the unit 3 Mute the main sound system and rotate the Audio Level Control on the MM400C to maximum counter clockwise Off 4 Set the Power ON OFF switch to the ON po...

Страница 13: ...If the PWR LED glows and the 10 Modulation LED blinks green the Power Switch is in Audio Mute Mode If the LEDs extinguish the Power Switch is in Normal or Power Mode Changing Power Switch Function 1...

Страница 14: ...ething metallic as illustrated in the example use extreme caution not to scratch the finish Breaching the finish may cause corrosion of the metal housing 2 Notice that the Magnet Housing Assembly Slot...

Страница 15: ...ule If this is not pos sible or if you are still having problems capacitors can be installed on the mic wires inside the TA5F connector housing Install the capacitors as follows Use 330 pF capaci tors...

Страница 16: ...lock range is labeled on the ouside housing for each indi vidual transmitter FREQUENCY CAP ANTENNA BLOCK RANGE COLOR WHIP LENGTH 470 470 100 495 600 Black 5 37 19 486 400 511 900 Black 5 16 20 512 000...

Страница 17: ...ty mode mismatched 5 Transmitter audio muted 1 Transmitter gain audio level is far too high Check Modulation LEDs on transmitter and receiver as it is being used See Operating Instructions Attaching a...

Страница 18: ...This device should be installed and operated so that its antenna s are not co located or operating in conjunction with any other antenna or transmitter Emission Designator 180KF3E Specifications subje...

Страница 19: ...of warranty repairs Returning Units for Repair For timely service please follow the steps below A DO NOT return equipment to the factory for repair without first contacting us by email or by phone We...

Страница 20: ...sonics Inc will pay for the cost of returning your equipment to you This warranty applies only to items returned to Lectrosonics Inc or an authorized dealer shipping costs prepaid within one year from...

Отзывы: