User's Manual

LM400

LECTROSONICS, INC.

BATTERY INSTALLATION

The transmitter is powered by a standard alkaline or lithium 9 Volt battery. It is important that you use ONLY an

ALKALINE or LITHIUM battery for longest life. Standard zinc-carbon batteries marked “heavy-duty” or “long-

lasting” are not adequate. Ni-cad rechargeable batteries will only provide 1.5 hours of operation, or less, and will run

down quite abruptly. Alkaline batteries provide over 6 hours of operation at room temperature. Lithium batteries can be

used to provide up to 20 hours and will work at lower temperatures. Care should be taken not to leave a fully dis-

charged lithium battery in the transmitter, as swelling of the battery can make it difficult to remove from the compart-

ment. The battery status circuitry is designed for the voltage drop over the life of alkaline batteries.

Swing the door open and take note of the polarity marked inside showing the location of the positive (+) and negative

(-) terminals. You can see the large and small contact holes inside the battery compartment with the door open.

Insert the battery correctly and close the cover by rotating the door, reversing the opening procedure illustrated above.

If the battery is inserted incorrectly, the door will not close. Do not force the door closed.

OPERATING INSTRUCTIONS

1) Install a fresh battery according to the instructions above.

2) Insert the microphone plug into the input jack.Turn the plug clockwise to lock it to the jack.

3) Mute the sound system.

4) Turn the transmitter power switch to the “ON” position.

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

6) While speaking or singing at the same voice level that will actually be used, observe the MODULATION LEDs.

Adjust the AUDIO LEVEL control knob until the LEDs begin to light. At too low a setting neither LED will light as

you speak. Gradually, turn the gain up until the –20 dB LED lights green and then the -10 dB lights green. We

strongly recommend setting the gain of the transmitter even higher so that the first red LED occasionally lights.

7) Once the gain has been adjusted, the audio system audio can be turned on to make level adjustments in the main

audio system.

To open the battery

compartment door, push the

door up and away from the case

with your thumb, then swing

open.