Troubleshooting Guide - Lectrosonics Quadra Instruction Manual

Troubleshooting Guide

Symptom
Transmitter and receiver on, receiver
shows strong RF signal, but no blue RF
LED on receiver and no audio
Low audio level at receiver with analog
inputs at transmitter
Low audio level at receiver with digital
inputs at transmitter
The audio at the receiver is distorted, using
analog signals at the transmitter
The audio at the receiver is distorted, using
digital signals at the transmitter
The audio sounds very "bright" at the
receiver but not when monitoring the same
channels at the transmitter
I hear channels 3 and 4 at the receiver, but
not 1 and 2
Audio channels are missing at the receiver
(you are expecting four channels but only
receive 2)
One or more of the audio channels at the
receiver are only heard in one ear
One or more of the audio channels at the
receiver are only heard in one ear
The system is exhibiting poor operating
range
The system is exhibiting poor operating
range
The system is exhibiting poor operating
range
Receiver battery life seems very short
The LCD is dark and impossible to read
Rio Rancho, NM
Cause
Transmitter and receiver are not both using
the same channel setup
Transmitter audio trims not set correctly or
overall send level from the console is too
low
Overall send level too low at the monitor
console
The transmitter is being overdriven at the
inputs
The mix is being clipped before it gets to
the transmitter
HF boost is engaged at the receiver
Split 3-4 mode is engaged at the receiver
Incorrect Channel Setup
Stereo balance and/or Panning setups are
incorrect
Audio only being sent to one channel of the
transmitter.
An interfering signal is present
The receiver antennas are contacting the
performer's body or another conductive
surface
The transmitter antenna is not connected
properly or signal is being filtered
improperly
Incorrect battery type, poorly charged
batteries or partly discharged batteries
LCD has "timed out"
Digital IEM System
Action
Decide which channel setup (2-channel,
4-channel, or split modes) you plan to use
and set both the transmitter and receiver
the same. Remember that for split modes
to work on the receiver, the transmitter
must be set to 4-channel mode.
Reduce attentuation (increase signal level)
at the transmitter by using the Audio Trim
menu. Input trims are set to -20 dB at the
factory. Or, increase the send level or mix
level from the console.
Increase the send level or mix level to the
digital output buss on the mixing console.
Reduce the level of the sends from the
mixing console, or increase the amount of
attenuation at the transmitter by using the
Audio Trim menu page.
Reduce the overall level of your mix at the
console before sending to the transmitter.
Check the settings for the HF boost in the
receiver menu. Re-set to taste. Most often,
no HF boost is needed since the Quadra
system audio response extends to 20 kHz.
Change the channel setup to 4-channel
mode using the Chan. Setup page in the
receiver.
Decide which channel setup (2-channel,
4-channel, or Split modes) you plan to use
and set both the transmitter and receiver
the same. Remember that for split modes
to work on the receiver, the transmitter
must be set to 4-channel mode.
Check the panning menu on the receiver
and adjust the balance and/or pan controls
to place the appropriate channels where
you would like them in the stereo field.
Check the connections between the mixing
console and the transmitter. If both (or
multiple) channels are connected properly,
check to make sure the mix from the
console has information on all channels.
Choose an operating frequency that does
not already have a strong signal present.
See Tuning, pp. 12 and 18.
Place the receiver so that the antennas
are not obstructed by metallic fabric nor
contacting the wearer's skin directly.
The antennas should not be folded or
"scrunched". Do not place the receiver in
the wearer's pocket.
Check your transmitter connection/s,
and ensure that if the signal is passing
through any other type of device that the
device does not filter out the 902-928 MHz
frequencies.
Please use only fresh, known-quality
alkaline, lithium, or freshly charged
rechargeable batteries. You should get at
least 6 hours operating time with name-
brand alkaline AA batteries, and more with
lithium or good rechargeable batteries.
Push any button to turn on the LCD
backlight. Depending on how it is set in
the menu, it will time out in 30 seconds, 5
minutes, or never.
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