Lectrosonics UM700 - Manual (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 13