Troubleshooting - Lectrosonics LM Instruction Manual

LM/IM

Troubleshooting

It is important that you follow these steps in the sequence listed.
Symptom:
Transmitter Battery LED off
No Transmitter Modulation LEDs
Receiver Indicates RF But No Audio
Receiver RF Indicator Off
No Sound (Or Low Sound Level), Receiver Indicates Proper Audio Modulation
Distorted Sound
Wind Noise or Breath "Pops'"
Hiss and Noise -- Audible Dropouts
Excessive Feedback (With Mic)
12
Possible Cause:
1. Battery is inserted backwards.
2. Battery is dead.
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 miswired.
5. Instrument Cable damaged or not plugged in.
6. Musical instrument volume control set to low.
1. Ensure that the transmitter and receiver Frequency Select
Switches are set to the same frequency.
2. Make sure the compatibility mode is the same on transmitter
and receiver.
3. Ensure musical instrument volume control is not set to minimum.
1. Transmitter not turned on, or battery is dead.
2. Receiver antenna missing or improperly positioned.
3. Transmitter and receiver not on same frequency.
Check switches/display on transmitter and receiver.
4. Operating distance is too great.
1. Receiver output level set too low.
2. Receiver output is disconnected; cable is defective or miswired.
3. Sound system or recorder input is turned down.
1. Transmitter gain (audio level) is too high. Check Modulation
LEDs on transmitter and receiver as transmitter is being used.
(Refer to ATTACHING A MICROPHONE OR MUSICAL
INSTRUMENT AND ADJUSTING AUDIO LEVELS.)
2. Receiver output may be mismatched with the sound
system or recorder input. Adjust output level on receiver to the
correct level for the recorder, mixer or sound system.
3. Transmitter is not set to same frequency as receiver. Check that
frequency select switches on receiver and transmitter match.
4. RF interference. Reset both transmitter and receiver to a clear
channel.
1. Reposition microphone, or use a larger windscreen, or both.
1. Transmitter gain (audio level) far too low.
2. Receiver antenna missing or obstructed.
3. Operating distance too great.
4. RF interference. Reset both transmitter and receiver to a clear
channel.
5. Musical instrument volume set too low.
1. Transmitter gain (audio level) too high. 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.