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WIR TX75 Two-Channel Infrared Transmitter
MAN 166C
Troubleshooting
For easier troubleshooting, the TX75 units are equipped with a series of self-tests and indications. Please see WIR TX75 indicator
lights table on page 12 to aid in troubleshooting.
The WIR TX75 “Power Indicator” is not lit:
• Make sure the power supply is plugged into the transmitter 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 is working.
The WIR TX75’s Ch1 or Ch2 “Audio-level Indicator” does not light:
• Make sure the WIR TX75 is plugged in.
• Set the “Indicators” switch on the back panel to “On”.
• Make sure the audio input is connected properly. See page 10.
• Make sure an active and adequate level audio signal is being sent to the WIR TX75 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 TX75-S slave emitters to the WIR TX75 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.