Lectrosonics MM400C Manual de usuario

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This guide is intended to assist with

initial setup and operation of your

Lectrosonics product.

For a detailed user manual, down-

load the most current

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MM400C Transmitter

07 july10

U.S. Patent 7,225,135

LECTROSONICS, INC.2

Controls and Functions

Audio Input Jack

Designed for electret lavaliere microphones. Modest line level signals can also

be used.

Power ON/OFF and Mute Switch

Turns the transmitter on and off, or can be conﬁgured as an audio mute

switch.

Power LED

Indicates power status and battery strength.

Audio Level Control

The front panel Audio Level Control is used to adjust the incoming audio input

level for proper modulation.

Modulation LEDs

The two bicolor Modulation LEDs provide a visual indication of the input audio

signal level from the microphone.

Antenna

The ﬂexible galvanized steel cable antenna supplied with the transmitter is

attached at the factory and is not removable by the user.

Frequency Select Switches

Two 16-position rotary switches adjust the operating frequency. The 1.6M is a

coarse adjustment and the 100K is the ﬁne adjustment.

Belt Clip

The stainless steel wire belt clip may be removed for special applications by

simply pulling out one side to release the end of the clip.

www.lectrosonics.com 3

Audio Input Jack

Frequency Select

SwitchThumbscrew

and Cover Plate

Antenna

Battery

Compartment

Cap

Power ON/OFF and Mute

Switch (External Switch

Magnet Housing Assembly

Shown.)

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 connectors. Follow the procedure below for best results:

1. Carefully blot the transmitter dry with a clean paper towel or cloth. Re-

move all moisture. After opening 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 BE-

FORE 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 Compartment,

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 PETROLEUM

JELLY. Silicone-based lubricants will dissolve the rubber. Failing to

lubricate the O-rings after each use will signiﬁcantly shorten their life.

LECTROSONICS, INC.4

Operating Instructions

Selecting the Compatibility Mode

The MM400C can be used with Lectrosonics 400 Series Digital Hybrid, 200

Series analog, 100 Series analog and some non-Lectrosonics analog wireless

receivers. Contact the factory for details on the non-Lectrosonics models that

can be used. The transmitter must be set to the operating mode of the match-

ing receiver, which is done using the supplied screwdriver and a battery.

NOTE: The unit is supplied from the factory in Hybrid mode.

1) Ensure the battery is good.

2) Turn off the transmitter.

3) With a small screwdriver (included), set the Frequency Select Switches to

CC. (for Change, Change).

4) Power up the unit brieﬂy – just long enough for the LED’s to light up and

then turn it off - about one second.

5) Change the Frequency Select Switches to one of the following settings:

• To set Lectrosonics 100 Series mode: 1,1

• To set Lectrosonics 200 Series mode: 2,2

• To set Mode 3*: 3,3

• To set Lectrosonics Hybrid mode: 4,4

• To set IFB mode: 5,5

• To set Mode 6*: 6,6

* contact the factory for details

6) Turn the unit on, wait a couple of seconds and turn off again.

7) Change the Frequency Select Switches to 0,0.

8) Turn on the transmitter to complete the operation.

The LEDS will blink to indicate the selected compatibility mode. Immediate-

ly after power up, all LEDS will blink together red, then green, followed

by the audio level LEDs (-20 and -10) blinking to indicate the mode.

The -20 and -10 LEDs will blink:

 •Oncefor100Seriesmode

 •Twotimesfor200Seriesmode

 •ThreetimesforMode3

 •Fourtimesfor400mode

 •FivetimesforIFBmode

 •SixtimesforMode6

At powerup the transmitter will conﬁrm the current compatibility mode with

the number of blinks listed here. This setting will remain the same until

you reset it with the procedure listed above.

www.lectrosonics.com 5

SignalLevel -20LED -10LED

Less than -20 dB Off Off

-20 dB to -10 dB Green Off

-10 dB to +0 dB Green Green

+0 dB to +10 dB Red Green

Greater than +10 dB Red Red

Attaching a Microphone and Adjusting Gain

1) Ensure the battery is in good condition.

2) Insert the microphone plug into the input jack; be sure that the connector

is snug by tightening the threads.

3) Mute the associated receiver’s audio output.

4) Turn on the transmitter.

5) Position the microphone in the location you will use in actual operation.

While speaking or singing at the same voice level that will actually be

used, observe the Modulation LEDs. Adjust the AUDIO LEVEL control

until the –20 dB LED glows green with occasional red ﬂickers and -10 dB

glows green. This will set the gain of your transmitter to between +0 dB

and +10 dB modulation.

(See chart at left.)

6) Once the gain

has been adjusted, the

audio system audio can

be turned on to make

level adjustments in the

main audio system.

NOTE: The transmitter Audio Level Control should not be used to

control the volume of your sound system or recorder levels. This

adjustment matches the input gain with the user’s voice level and

microphone positioning.

Operating Notes

If the audio level is too high — both LEDs will blink red frequently or glow a

steady red. This condition may reduce the dynamic range of the audio signal.

If the audio level is too low — neither LED will glow, or only the -20 LED will

glow green. This condition may cause hiss and noise in the audio.

Different voices will usually require different settings of the AUDIO LEVEL

control, so check this adjustment as each new person uses the system. If

several different people will be using the transmitter and there is not time to

make the adjustment for each individual, adjust it for the loudest voice.

LECTROSONICS, INC.6

Frequency Select Switches

Two 16-position rotary switches adjust the center frequency of the carrier. The

1.6M is a coarse adjustment and the 100K is the ﬁne adjustment.

Changing the Frequency

Locate the rotating watertight door on the bottom of the transmitter. Unscrew

the knob and pull the door outward, then swivel open to reveal two small

rotary switches. With the small screwdriver supplied with the kit, turn the left

switch to the ﬁrst character in the two-digit Transmitter Frequency Switch Set-

ting code, then turn the right switch to the second character of the two-digit

code. For example: the frequency is 623.000, and the two-digit Setting code

is 56, thus the lefthand switch on your transmitter should be set to “5” and the

righthand switch to “6”.

Note: If you are using a receiver with a frequency scan function, ﬁnd

a clear frequency with the receiver, then set the transmitter to the

frequency selected with the receiver. With Lectrosonics 400 Series

receivers, a front panel LCD character display will indicate the correct

transmitter switch settings as a two-character alphanumeric hex code

once a clear frequency has been located with the scan function (if the

receiver is so equipped).

Transmitter Frequency

Select Switches

012

EF012

5 6

www.lectrosonics.com 7

Battery Installation

WARNING: Do not open battery compartment if unit is wet. Read

“Preventing Internal Corrosion” on page 3 before proceeding.

The transmitter is powered by a standard lithium, NiMH or alkaline AA 1.5 volt

battery. The battery status circuitry is designed for the voltage drop over the

life of lithium batteries. While NiMH rechargeable batteries will work, they run

down quite abruptly. Because of this, using the PWR LED to verify battery

status not reliable with NiMH batteries. It is possible to track battery status us-

ing the Battery Timer function available in a number of Lectrosonics receivers.

(Refer to your receiver manual to determine if this function is available.

Alkaline batteries provide about 1.75 hours of operation with some warn-

ing. Lithium batteries can be used to provide over 6 hours of operation and

provide about 30 minutes of warning as the LED turns red.

Note: Standard zinc-carbon batteries marked “heavy-duty” or “long-

lasting” are not adequate.

To access the battery compartment,

unscrew and remove the Battery Com-

partment Cover. The positive (+) bat-

tery terminal goes into the transmitter

ﬁrst. Screw the Battery Compartment

Cover back into the transmitter body.

If the battery is inserted incorrectly,

the cover will not screw in easily and

the unit will not work.

Battery Compartment

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