Lectrosonics MM400 - Manual User Manual download pdf (Page 10)

MM400

TROUBLESHOOTING

Before going through the following chart, be sure that you have a good battery in the transmitter. It is important that

you follow these steps in the sequence listed.

SYMPTOM POSSIBLE CAUSE

TRANSMITTER BATTERY LED OFF 1) Battery is inserted backwards.

2) Battery is dead.

NO TRANSMITTER MODULATION LEDs 1) Gain control turned all the way down.

2) Battery is in backwards. Check power LED.

3) Mic capsule is damaged or malfunctioning.

4) Mic cable damaged or mis-wired.

RECEIVER INDICATES NO RF 1) Transmitter not turned on.

2) Transmitter battery is dead.

3) Receiver antenna missing or improperly positioned.

4) Transmitter and receiver not on same frequency. Check

switches/display on transmitter and receiver.

5) Operating range is too great.

6) Transmitter antenna not connected

NO SOUND (OR LOW SOUND LEVEL),

RECEIVER INDICATES PROPER AUDIO

MODULATION

1) Receiver output level set too low.

2) Receiver output is disconnected; cable is defective

or mis-wired.

3) Sound system or recorder input is turned down.

DISTORTED SOUND 1) Transmitter gain (audio level) is far too high. Check mod

level lamps on transmitter and receiver as it is being used.

(refer to “Operating Instructions” section for details on gain

adjustment)

2) Receiver output may be mis-matched with the sound

system or recorder input. Adjust output level on receiver

to the correct level for the recorder, mixer or sound

system.

3) Excessive wind noise or breath “pops.” Reposition

microphone and/or use a larger windscreen.

4) Transmitter is not set to same frequency as receiver.

Check that frequency select switches on receiver and

transmitter match.

HISS AND NOISE -- AUDIBLE DROPOUTS 1) Transmitter gain (audio level) far too low.

2) Receiver antenna missing or obstructed.

3) Transmitter antenna missing.

4) Operating range too great.

EXCESSIVE FEEDBACK 1) Transmitter gain (audio level) too high causing limiting.

Check gain adjustment and/or reduce receiver output

level.

2) Transmitter too close to speaker system.

3) Mic is too far from user’s mouth.

LECTROSONICS, INC.

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Lectrosonics MM400 - Manual User Manual Page 10

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