
11
WIR TX75 C/D Infrared Transmitter
Troubleshooting
For easier troubleshooting, the WIR TX75 C/D PRO units are equipped with a series of self-tests and indications. Please see WIR
TX75 C/D PRO indicator lights table on page 12 to aid in troubleshooting.
The WIR TX75 C/D PRO “Power Indicator” is not lit:
• Make sure the power supply is plugged into the transmitter, or make sure the POE power supply is plugged in to a slave jack, and
any remote power switch is on.
• Set the “Indicators” switch on the back panel to “On”.
• Make sure the electrical outlet is on.
• Make sure the 48 VDC power supply, or the POE power supply, is working.
The WIR TX75 C/D PRO’s Ch1 or Ch2 “Audio-level Indicator” does not light:
• Make sure the WIR TX75 C/D PRO is plugged in.
• Set the “Indicators” switch on the back panel to “On”.
• Make sure the audio input is connected properly. Refer to gures 6,7,8, or 9 depending on the connection being used.
• Make sure an active and adequate level audio signal is being sent to the WIR TX75 C/D PRO transmitter.
No Sound through Receivers:
• Check to make sure the receiver is operating on the same frequency as the transmitter.
• If some of the receivers work but others don’t, check for bad batteries or earphones.
• If none of the receivers work, check to see if the power and audio input cables are connected to the transmitter. Verify that the
“Power Indicator” is on steady, and ch1 or ch2 “audio-level indicator” blinks periodically.
• Check to see if the transmitter is connected properly to the audio source. The audio-level indicators should ash on channels that
have audio.
• Make certain the transmitter is not covered by objects which would block infrared light.
Sound Through the Receivers is Weak and Noisy:
• Try adjusting the audio input level (see page 10). If the signal sounds okay, you may need to reposition the transmitter beam or add
additional WIR TX75 S slave emitters to the WIR TX75 C/D PRO system.
Buzzing or Humming Noise in Sound System:
• Check for ground loops or noise on the input signal.
• Check to make sure the “balanced / unbalanced” switch is in the correct position.
If these instructions do not address your problem or the issue persists, please call your authorized Williams Sound dealer or
representative.
WIR TX75 PRO Indicator lights
INDICATOR ON UNIT STATE DESCRIPTION
Power Indicator – Green
(round or rectangle) Master or Slave
On steady Unit is powered and actively transmitting
Fade-on, Fade-o… (continuous) Unit is powered and in sleep/power-save mode (no audio signal
detected, unit is not transmitting)
Fast blink (continuous) Self test has detected an internal failure on this unit
Audio Level Indicators – Yellow
round (ch1 or ch2) Master
Blinking periodically Audio is present on this channel and is set to the optimum level
On steady (or most of the time) Audio is present on this channel but the level is too high
O Audio is not present OR audio level is too low on this channel
Slave Status Indicator – Yellow
(rectangle) Master or Slave
On steady Carrier signal is being sent to this slave
O No carrier signal is being sent to this slave
Fast blink (continuous) Self test has detected a CAT-5e cable failure between the master
and this slave unit
All indicators Master or Slave
On for 2 seconds, O for 1
second, resumes normal states
Initial power-on sequence OR unit has reset
On for 2 seconds, O for 1
second… (continuous)
Unit is continuously resetting - may be due to a low voltage supply
condition (In Master: bad power supply. In Slave: bad CAT-5e cable
or CAT-5e cable is too long)
NOTE: The indicator lights can all be turned o AFTER initial set-up to allow for less conspicuous operation.