Lectrosonics UM190b User Manual download pdf (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

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Lectrosonics UM190b User Manual Page 11

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