Lectrosonics UDR700, Instruction Manual

Encrypted Digital Wireless System 

Troubleshooting 

This manual applies only to UDR700 version 3.0/3.0 and higher. 

Power Problems 

UDR700 

Display not lit or dimly lit  

Power cord between main power supply and UDR700 disconnected or 

defective. 

External power supply disconnected, defective or inadequate. 
The External DC power input is protected by an auto-reset polyfuse.  If 

external DC power is used, disconnect External DC power source 
and wait about 10 seconds for the fuse to reset, then reconnect 
power source. 

Main power supply defective. 

UM700 

Power LED does not glow when 
transmitter Power ON/OFF Switch 
set to ON 

Battery is dead, or too low to be used. 
Battery is inserted backwards. 

No Modulation LEDs  

Battery dead or in backwards.  Check Power LED. 
Audio Level Control turned all the way down. 
Mic capsule is damaged or malfunctioning. 
Mic cable damaged or mis-wired. 

UT700 

Power LED does not glow when 
transmitter Power On/Off Switch 
set to On 

Battery is inserted backwards. 
Battery is dead, or too low to be used. 

No Modulation LEDs  

Battery dead or in backwards.  Check Power LED. 
Audio Level Control turned all the way down. 
Mic capsule is damaged or malfunctioning. Contact the factory for 

repair. 

RF Problems 

Antenna Phase Combining Indicator on 
UDR700 has three LEDs glowing but 
never moves 

The ROTA-VERSITY switch is set to the A or B position (using only 

one antenna) instead of the normal, center position (using both 
antennas). 

An antenna may be disconnected, have a bad connector or defective 

antenna cable. 

No LEDs glow on Receiver RF Level 
Indicator  

Receiver not turned on. 
Transmitter not turned on, or battery is dead. 
A receiver antenna may be disconnected, have a bad connector or 

defective cable. 

Transmitter and receiver not on same frequency. 
Transmitter antenna not connected. (UM700 only) 
Operating range is too great. 

RF LEVEL is weak, but Antenna 
Phase Combining Indicator LEDs glow 
and move 

An antenna may have bad connector and damaged cable. 
The antennas may need to be moved or reoriented. 
Improper length of UHF whip antenna, or wrong antenna. 
Transmitter is 100 kHz (one switch position) off from the receiver 

frequency. 

Rio Rancho, NM 

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