Lectrosonics UCR300 - Manual (Page 11)

UHF Wireless Diversity Receiver
TROUBLESHOOTING
POWER SUPPLY AND FUSE
LEDs not lit or dimly lit
• External power supply disconnected or inadequate.
• Main power supply fuse tripped. Turn the receiver off,
remove the cause of the overload and turn the receiver
back on.
• Wrong polarity power source. The external DC in
requires POSITIVE to be on the center pin.
PILOT TONE SQUELCH
The PILOT indicator lamp on the front panel glows green to
indicate that the audio has been turned on at the transmitter, and
that the audio output on the receiver is enabled. When the lamp is
on, the audio is enabled. When the lamp is off, the audio is muted.
PILOT lamp on, but no sound
• Audio output cable bad or disconnected.
• Audio Output level set too low.
PILOT lamp does not come on when transmitter audio
switch is turned on
• It takes several seconds for the relay to actuate the
PILOT lamp. Turn the transmitter power and audio
switches on and wait 3 to 5 seconds for the lamp to come
on.
Normal audio on output but the Mod meter on the front
panel is not working.
• The Power switch may be in the “ON (Pilot Disable)”
position. This front panel switch should be in the right-
most position.
ANTENNAS AND RF SIGNAL STRENGTH
RF Level is weak.
• Antenna is disconnected or there is a bad connection
• Antenna may need to be moved or re-oriented
• Improper length of antenna, or wrong antenna. UHF
whip antennas are generally about 3 to 5 inches long.
UHF helical antennas may be shorter, but are often less
efficient.
AUDIO SIGNAL QUALITY
Poor signal to noise ratio
• Transmitter gain set too low
• Noise may not be in wireless system. Mute the audio
signal at the transmitter and see if noise remains. If the
noise remains, then turn the power off at the transmitter
and see if it remains. If the noise is still present, then the
problem is not in the transmitter.
• If noise is still present when the transmitter is turned
off, try lowering the audio output level on the UCR300
rear panel and see if the noise lowers correspondingly. If
the noise remains, the problem is not in the receiver.
• Receiver output is too low for the input of the device it
is feeding. Try increasing the output level of the UCR300
and lowering the input gain on the device the UCR300 is
feeding.
Distortion
• Transmitter input gain too high. Check and/or re-adjust
input gain on transmitter according to the LEDs on the
transmitter and then verify the setting with the transmitter
audio level LED strip on the UCR300 front panel.
• Audio output level too high for the device the UCR300
is feeding. Lower the output level of the UCR300.
Rio Rancho, NM – USA 11