Lectrosonics MM400a - Manual User Manual download pdf (Page 8)

MM400A

BATTERY INSTALLATION

WARNING! TO PREVENT INTERNAL CORROSION!

If the transmitter is wet (either due to immersion or high levels of perspiration), BEFORE opening any covers or connectors,

carefully blot the transmitter dry with a clean paper towel or cloth. Remove all moisture. After opening any connector or cover,

carefully blot up any remaining moisture that may have remained around the seal. THIS IS IMPORTANT! DO NOT CLOSE

ANY COVER OR CONNECTOR BEFORE MAKING CERTAIN THERE IS NO MOISTURE IN OR NEAR THE OPENING.

After use, it is important to store the transmitter in a dry place with all access doors and connectors opened to allow any internal

humidity to evaporate. Specifically, open the battery door, the frequency 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.

The transmitter is powered by a standard lithium, NiMH

or alkaline AA 1.5 volt battery. Standard zinc-carbon

batteries marked “heavy-duty” or “long-lasting” will

not work. NiMH rechargeable batteries will only provide

2 hours of operation and will run down quite abruptly.

Alkaline batteries provide over 2 hours of operation with

some warning. Lithium batteries can be used to provide

up to 4.5 hours. The battery status circuitry is designed

for the voltage drop over the life of lithium batteries.

To open the battery compartment, unscrew and remove

the battery cover. Take note of the polarity marked on

the case showing the location of the positive (+) and

negative (-) terminals. The positive (+) battery terminal

goes into the transmitter. You can see the small contact

hole inside the battery compartment with the cover

removed.

Insert the battery correctly and screw the Battery

Compartment Cover into the transmitter body. If the

battery is inserted incorrectly, the cover will not screw in

easily and the unit will not work.

MICROPHONE RF BYPASSING

Some mics require RF protection to keep the radio

2 WIRE MIC 3 WIRE MIC

signal from affecting the capsule, even though the

transmitter input circuitry is already RF bypassed.

If the mic is wired as directed, and you are having

difficulty with squealing, high noise, or poor frequency

response; RF is likely to be the cause.

The best RF protection is accomplished by installing RF

bypass capacitors at the mic capsule. If this is not

possible, or if you are still having problems, capacitors

can be installed on the mic wires inside the TA5F con-

nector housing.

Leaded capacitors: P/N 15117

Install the capacitors as follows: Use 330 pF capacitors.

Leadless capacitors: P/N SCC330P

Capacitors are available from Lectrosonics. Please

All Lectrosonics lavalier mics are already bypassed and

specify the part number for the desired lead style.

do not need any additional capacitors installed for proper

operation.

INPUT JACK WIRING

6V Mic Bias

30uF

100 2k

To Mic Amp

2.2nF

330pF 330pF

Mic

ack

Battery Compartment Cover

Battery Compartment

CAPSULE

SHIELD

AUDIO

SHIELD

AUDIO

BIAS

MIC

CONNECTOR

MIC

CONNECTOR

Preferred locations for bypass capacitors

Alternate locations for b

ass ca

acitors

LECTROSONICS, INC.

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