Lectrosonics UM250c - Manual (Page 12)

UM250C
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
DISTORTED SOUND
HISS AND NOISE -- AUDIBLE DROPOUTS
EXCESSIVE FEEDBACK
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.
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
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.
1. Transmitter gain (audio level) is far too high. Check modulation
level lamps on transmitter and receiver as it is being used. (Refer
to Operating Instructions 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.” Re-position 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. Transmitter antenna missing.
4. Operating range too great.
1. Transmitter gain (audio level) too high. Check gain adjustment, or
reduce receiver output level, or both.
2. Transmitter too close to speaker system.
3. Mic is too far from user’s mouth.
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