Lectrosonics UM700 User Manual download pdf (Page 13)

Digital Frequency Agile 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

switches/display on transmitter and receiver.

5) Operating range is too great.

6) Transmitter antenna not connected

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.

(refer to pages 8/9 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.

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.

MICROPHONE HAS A “WHINE” NOISE IN THE

BACKGROUND WHICH VARIES AS THE MIC CABLE

IS MOVED

1) Install bypass capacitors at both ends of the mic cable or

use the factory supplied microphone.

RECEIVER OUTPUTS AN EXTREMELY LOUD,

HISSY, SWISHY SOUND

1) Encryption keys in transmitter and receiver do not match.

Refer to receiver manual to choose a new key and send it

to the transmitter.

NO AUDIO OUTPUT, AUDIO LEDS BLINK IN

SEQUENCE, LED DISPLAY SHOWS

“POWER TX OFF+ON” OR “NEW KEY REQUIRED”

1) System is in security level 3 and is not synchronized.

to correct this in security level 2, turn the transmitter off

then on again. In level 3, a new key must be generated.

SECURITY FEATURES DIFFERENT FROM 1) This manual applies only to UDR700 version 3.0/3.0 and

THE DOCUMENTATION higher.

Rio Rancho, NM – USA

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Lectrosonics UM700 User Manual Page 13

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