Troubleshooting - Lectrosonics UH400TM Instruction Manual

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
Transmitter Battery LED Off
No Transmitter Modulation LEDs
Receiver RF Lamp Off
No Sound (or Low Sound Level), Receiver Mod Level LEDs Are On
No Sound (or Low Sound Level), Receiver Mod Level LEDs Are Off
Distorted Sound
Hiss and Noise - Audible Dropouts
Excessive Feedback
Rio Rancho, NM
Frequency Agile Plug-On UHF Transmitter
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 mis-wired.
5. Phantom power not enabled for mic that requires it.
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.
1. Receiver output level set too low.
2. Receiver output is disconnected; cable is defective or mis-wired.
3. Sound system input is turned down.
1. Transmitter gain (audio level) set too low.
2. Faulty microphone
3. Phantom power not enabled for mic that requires it.
4. Not enough current to power microphone. (Earthworks M30 is
only known microphone we've found to exhibit this issue.)
1. Transmitter gain (audio level) is far too high. Check mod level
lamps on transmitter and receiver as it is being used. (Refer to
the Operating Instructions section for details on gain adjustment)
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. 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.
1. Transmitter gain (audio level) far too low.
2. Receiver antenna missing or obstructed.
3. Operating range too great.
1. Transmitter gain (audio level) too high causing the limiter to
reduce the dynamic range which in turn causes feedback.
Check gain adjustment and/or reduce receiver output level.
(Refer to the Operating Instructions section for details on gain
adjustment)
2. Transmitter too close to speaker system.
3. Mic is too far from user's mouth.
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