Lectrosonics UM190b - Manual (Page 11)

UHF Belt-Pack Transmitter
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 RF LAMP OFF 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
labels on transmitter and receiver.
5) Operating range is too great.
6) Transmitter antenna not connected
NO SOUND (OR LOW SOUND LEVEL),
AND RECEIVER MOD LEVEL LEDs ARE OFF
1) Transmitter mic gain set too low.
2) Defective microphone or cord.
NO SOUND (OR LOW SOUND LEVEL),
RECEIVER MOD LEVEL LEDs ARE ON
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. (See Operating Instructions.)
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.
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. 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.
Rio Rancho, NM – USA 11