Williams Sound WIR TX90 Troubleshooting guide

SoundPlus™ Infrared Listening System
Model WIR TX90, Two Channel System
Model WIR SYS 90 ADV, Two Channel System
Model WIR SYS 91V, Two Channel System
Transmitter Model WIR TX90
Optional Receiver Models WIR RX22-4, WIR RX15-2, WIR RX18
Optional Charger Models CHG 518, CHG 3512
Installation Guide &
User Manual
MAN 119G

2
SoundPlus™ Infrared Listening System,
Model WIR TX90, Two-Channel Listening System
Model WIR SYS 91V, Two-Channel Listening System
Model WIR SYS ADV, Two-Channel Listening System
Installation Guide & User Manual
Contents Page
System Overview ................................................................................................................................ 3
Installation Procedures
Determining Coverage Area ....................................................................................................... 4
Connect Power ......................................................................................................................... 6
Connect Audio Source .............................................................................................................. 7
Selecting a Frequency ............................................................................................................... 7
Select an Application Preset ...................................................................................................... 8
Adjusting Audio Inputs ............................................................................................................... 8
Adjusting Tone ........................................................................................................................... 8
Using the optional WIR TX9 Emitter for Additional Coverage ............................................................... 9
Receiver Safety ................................................................................................................................. 10
Optional IR Receiver Instructions ...................................................................................................... 11
Trouble Shooting .............................................................................................................................. 13
Warranty ........................................................................................................................................... 14
Specications ................................................................................................................................... 15

3
System Overview
The WIR TX90 two channel infrared transmitter combines infrared modulator and emitter technology into a single
mountable enclosure - reducing operating cost and eliminating precious rack space.
The WIR TX90 features an easy to use conguration preset for Music, Voice, or Hearing Assistance Applications.
It operates on dual 2.3/2.8 or 3.3/3.8 MHz selectable frequencies - ideal for high quality audio programs such
as music, theater and audio description. The WIR TX90 will accept any line level, balanced or unbalanced audio
inputs, and includes adjustable tone and volume control. Infrared receivers detect the transmission and convert
the light signals back into audio signals. The 2.3-3.8 MHz operating frequencies minimize high efciency lighting
interference.
No FCC license or radio approval is required with this equipment. It can be used anywhere in the world.
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the interference at his own expense.
NOTICE: A plasma monitor can degrade the audio quality of the SoundPlus™ Infrared Listening System.
Figure 1: Typical Two-Channel conguration for the WIR TX90

4
u Determine Coverage Area
Determine the coverage area needed for the seating area. When using the WIR TX90 transmitter with the RX22-
4 receiver, in single channel mode, the WIR TX90 can achieve a coverage area of 28,000 ft2 (2,600 m2). In four
channel mode, the WIR TX90 divides its power among the four signals to achieve a coverage area of 11,000 ft2
(1,022 m2). NOTE: The coverage area will vary depending on the sensitivity of the infrared receiver being
used. The following diagram illustrates coverage area when using a RX22-4, RX15-2, or RX18 receiver
with a single WIR TX90 transmitter in single channel mode.
0
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
10
20
30
40
50
60
70
80
90
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
FEET
FEET
RX22-4 Receiver
RX18 Receiver
RX15-2 Receiver
Receiver Coverage Area with
TX9 or TX90 Transmitter in
Single Channel Mode
Figure 2: Maximum range when using the RX22-4, RX15-2, or RX18 Receiver
These patterns are the direct radiation pattern. The infrared radiation does not drop to zero outside the illustrated
patterns; it decreases. It still may be useable at a greater distance, depending on the receiver sensitivity and the
reective characteristics of the room.
Reections of the infrared light from walls, ceilings, and oors may change these patterns.
Important: Remember to point the transmitter towards the listening audience!
Remember: opaque objects block infrared light. Thus, the transmitter cannot be concealed behind opaque walls,
curtains, etc.

5
CORRECT
INCORRECT
Figure 4: NOTE: When pointing the emitter, be
sure to keep the long dimension horizontal.
Figure 3: 3 Dimension Foot Pattern
WIRTX90 WIRTX9
WIRTX9 WIRTX9
Figure 5: Overlapping Illumination patterns to cover Larger Listening Areas
WIRTX90
Coverage Area
with SingleTransmitter
Coverage Area
with Second Emitter
Added to Same
Emission Point
(50% increase)
WIRTX9
Figure 6: Overlapping Illumination patterns to cover Larger Listening Areas

6
Power Connection for U.S. Application
Connect the TFP 010 power supply to the 3-pin Molex™ connector located on the
rear of the TX90 (see Figure 8).
For Applications Outside the U.S. Requiring 240 VAC Mains Supply:
Use the transformer power supply, model TFP 027. Make sure
TFP 027 power input switch (located on bottom of power supply)
is set to the “230” position.
Secondary specications: 24 VAC, 35 VA, 50/60 Hz.
Plug the power supply into the AC outlet.
TFP 027-01: 230VAC, Euro Mains Plug
TFP 027-02: 230VAC, UK Mains Plug
NOTE:
The WIR TX90 transmits when a baseband signal is present, and will shut off immediately
when no baseband signal is present. This auto shut-off feature preserves the life of the
infrared LEDs and reduces power consumption.
This system is designed for class 2, low-voltage wiring.
Always follow local electrical codes when doing low voltage wiring.
uConnect Power
WARNING: POWERLINE VOLTAGE MUST NOT FALL BELOW 90V, 0R
SYSTEM PERFORMANCE WILL BE GREATLY REDUCED!
Figure 7: WIR TX90 Rear View
Power Connection
Plug in Power Supply 120
VAC (US): TFP 010
230 VAC (CE): TFP 027
Wall/Ceiling
Mounting Bracket (BKT 024)
Set of threaded holes for use with
mounting bracket
Baseband Out
BNC Connector, 50 Ω
50 kHz-8 MHz Baseband
Power In Jack
Figure 8

7
uConnect Audio Source
Determine the length of the audio cable needed to connect to the sound system to the WIR TX90 transmitter.
Install the supplied Phoenix connector on the end of the audio cable to be connected to the transmitter. See
the back of the WIR TX90 for wiring instructions.
The WIR TX90 will accept line level, balanced or unbalanced audio inputs. If you wish to operate in single
channel mode, plug the audio cable with the installed Phoenix connector in “Channel A” OR the “Channel B”
connector. If you choose to operate in two channel mode, plug the audio cables with Phoenix connectors in
both “Channel A” AND “Channel B” connector. NOTE: By default, the WIR TX90 is set to operate in two-
channel mode. To turn Channel A or Channel B on/off, refer to the instructions Selecting a Channel, below.
uSelecting a Carrier Frequency Pair
The WIR TX90 offers two sets of carrier frequencies for Channel A and Channel B:
2.3 and 2.8MHz or 3.3 and 3.8MHz.
The WIR TX90 is preset to 2.3 and 2.8 MHz, which are the most commonly used. Move the slide switch to
select a pair of operating frequencies.
uSelecting a Channel
To activate a channel, press the “CHANNEL” button until the channel “ON” indicator lights. For example,
to operate only channel A, press the “CHANNEL” button until only the channel A “ON” indicator lights. To
operate both channel A and B, press the “CHANNEL” button until both “ON” indicators light.
Note: If you’re only using one channel, make sure the other channel is turned off to maximize
system coverage.
Figure 9: Audio Source Connections
Power on Indicator
Figure 10

8
uSelect the Audio Processing Application Preset
The WIR TX90 offers three preset audio processing options for the most common applications: Music,
Voice, and Hearing Assist. Use the “Music” setting when maximum dynamic range and audio quality are
preferred. Use the “Voice” setting for simultaneous interpretation, audio description, or other applications with
users that have primarily normal hearing. Use the “Assist” setting for hearing assistance applications to meet
the reduced dynamic range needs of hearing impaired listeners. You may select the same audio pre-set for
both Channel A and Channel B, or you may select them independently.
To select the audio processing preset, you must rst activate the channel you want to adjust. Press the
“channel” button to activate the channel(s) you want to choose an audio processing preset for, then press
the “Presets” button to choose the preset. The Music, Voice, or Assist indicator will light to show your
selection. After 10 seconds, the setting will be stored.
uAdjust Audio Input Level
The TX90 is designed to accept a line-level audio input signal. The “Level” indicator light for each channel
is used to help adjust the audio input level. When the indicator does not light, the input signal level is too
low. When the indicator is ashing, the signal level is optimal. When the indicator is steadily lit, but does not
ash, the input level is too high and can cause distortion. You can adjust the input level of both channels
simultaneously, or independently.
Make sure the input audio signal is connected to the WIR TX90. To adjust the audio input level, rst activate the
channel(s) you want to adjust by pressing the “CHANNEL” button, then press the “VOLUME” button. The Volume
indicator will light. Now, turn the “ADJUST” knob clockwise to increase the input signal or counter-clockwise
to decrease the input signal until the channel “Level” indicator is ashing. After 10 seconds, the setting will be
stored.
** IMPORTANT **
Audio level NORMAL (optimal): the audio indicator level will flash at a 1 second rate.
Audio level too HIGH: the audio indicator level will stay on or flash erratically.
Audio level too LOW: the audio indicator level will be off.
uAdjust Tone
The WIR TX90 has a tone adjustment to suit user preference and to compensate for the different frequency
responses of various infrared receiver models. First, make sure the audio source is active. Use a receiver
from the system to listen to the signal as you adjust the tone control.
To adjust the tone, rst activate the channel(s) you want to adjust by pressing the “CHANNEL” button, then
press the “TONE” button. The tone indicator will light. Now turn the “ADJUST” knob clockwise to emphasize
high frequencies (best for hearing assistance use). When you have reached the maximum adjustment, there
will be no further change in tone. Turn the “ADJUST” knob counter-clockwise to decrease the high frequency
emphasis. When you have reached the minimum adjustment, there will be no further change in tone. After 10
seconds, the setting will be stored.

9
Using the Optional WIR TX9 Slave Emitter for Additional Coverage
For larger facilities, additional emitter panels can be used to increase the overall coverage area. In these
cases, we recommend using the WIR TX9 slave emitter in tandem with the WIR TX90. The WIR TX90 can
drive multiple WIR TX9 emitters at one time. Each TX9 emitter will require its own power supply.
To TX9 Emitter
Baseband
Input
Baseband
Output
WIR TX9 Emitter (Rear) WIR TX90 Transmitter (Rear)
Figure 11: Connecting a WIR TX9 Emitter to a WIR TX90 Transmitter
To TX9 EmitterTo Second TX9 Emitter To Additional EmitersTo additional Emitters
WIR TX9 Emitter #1 (Rear) WIR TX90 Transmitter (Rear)WIR TX9 Emitter #2 (Rear)
Baseband
Input
Baseband
Output
Baseband
Input
Baseband
Output
Baseband
Output
Baseband
Output
Figure 12: Chaining multiple WIR TX9 Emitters Together
To add a second WIR TX9 emitter panel to the WIR TX90 transmitter, repeat the process above (the
WIR TX90 transmitter has two baseband output jacks).
Note: The WIR TX9 emitter panels can be “chained” together if needed for unlimited coverage
area. Each WIR TX9 emitter will require its own power supply. See Figure 12 below.

10
Receiver Safety Information
HEARING SAFETY
Williams Sound receivers are designed to amplify sounds to a high volume level which could
potentially cause hearing damage if used improperly. To protect your hearing and the
hearing of others:
1. Make sure the volume is turned down before putting on the earphone or headphone before
adjusting the volume to a comfortable level.
2. Set the volume level at the minimum setting that you need to hear.
3. If you experience feedback (a squealing or howling sound), reduce the volume setting and
move the microphone away from the earphone or headphone.
4. Do not allow children or other unauthorized persons to have access to the receiver.
BATTERY SAFETY AND DISPOSAL
Williams Sound receivers are supplied with disposable Alkaline batteries. Do not attempt
to recharge disposable batteries, which may explode, release dangerous chemicals, cause
burns, or other serious harm to the user or product.
PACEMAKER SAFETY
1. Before using Williams Sound receivers with a pacemaker or other medical device,
consult your physician or the manufacturer of your pacemaker or other medical device.
2. If you have a pacemaker or other medical device, make sure that you are using the
Williams Sound receiver in accordance with safety guidelines established by your
physician or the pacemaker manufacturer.
BATTERY SAFETY AND DISPOSAL
Help Williams Sound protect the environment! Please take the time to dispose of your
equipment properly.
Product Recycling for Customers in the European Union
Please do NOT dispose of your Williams Sound equipment in the household trash. Please
take the equipment to a electronics recycling center; OR return the product to the factory
for proper disposal.
Battery Recycling for Customers in the European Union
Please do NOT dispose of used batteries in the household trash. Please take the batteries
to a retail or community collection point for recycling.
CAUTION!
CAUTION!
CAUTION!
Recycling Instructions

11
Figure 15: WIR RX18 Under-the-chin Receiver
Optional Infrared Receivers
RX22-4 FRONT
RX22-4 TOP
On/Off
Volume Switch
Earphone
Jack
"On"
Indicator LED
Channel
Selector Knob
OFF
RX22-4 FRONT
RX22-4 TOP
On/Off
Volume Switch
Earphone
Jack
"On"
Indicator LED
Channel
Selector Knob
OFF
Channel Frequency
1 2.3 MHz
2 2.8 MHz
3 3.3 MHz
43.8 MHz
Figure 13: Four Channel Receiver, Model WIR RX22-4
Figure 14: WIR RX15-2 Headset Receiver
WIR RX18 Front View
Infrared
sensor
Infrared
sensor
Battery
Cover
Power &
Channel Switch
Power &
Channel Indicator Audio Input Jack
Monitor Button
Power &
Channel Switch
Power &
Channel Indicator
Volume Knob
RIGHT EARPHONELEFT EARPHONE

12
Optional Chargers
Figure 16: Multiple Battery Charger, Model CHG 518
CHG 518 Top
CHG 518 Back
WARNING: DO NOT ATTEMPT TO RECHARGE DISPOSABLE BATTERIES!
WARNING: DO NOT ATTEMPT TO RECHARGE DISPOSABLE BATTERIES!
Williams Sound
CHG
CHG
CHG
CHG
CHG
CHG
Figure 17: Multiple Battery Charger, Model CHG 3512
CHG 3512 Top CHG 3512 Back

13
Trouble Shooting
The WIR TX90 “Power On” indicator is not lit.
uMake sure the transformer is plugged into the transmitter and any remote power switch is on.
uMake sure the electrical outlet is on.
uMake sure the 24 VAC power supply is working.
The WIR TX90’s channel A or B “On” indicator is not lit.
uMake sure the desired audio channel has been activated. See Selecting a Channel on page 7.
uMake sure the WIR TX90 is plugged in.
uMake sure the audio input is connected properly. See page 6 or instructions on the back of the
WIR TX90.
uMake sure an active audio signal is being sent to the WIR TX90 transmitter.
No sound through receivers.
uCheck to make sure the receiver is operating on the same frequency as the transmitter.
uIf some of the receivers work but others don’t, check for bad batteries or earphones on the receivers
that aren’t working.
uIf none of the receivers work, check to see if the power and audio input cable are connected to the
transmitter and that the WIR TX90 “Power On” and Channel A or B “On” indicator is illuminated.
uCheck to see if the transmitter is connected properly to the sound system. The audio level indicators
should ash on channels that are selected.
uMake sure the “eye” is not covered up on the receiver. There must be clear line of sight between the
receiver eye and the transmitter panel.
Sound through the receivers is weak and noisy.
uListen to the audio signal through the headphone jack on the WIR TX90 transmitter (Figure 10). If
the signal is weak and noisy here, try increasing the audio input level (see Adjust Audio Input Level,
page 8), or increase the input signal level from the sound system by turning up the mixer control.
If the signal sounds okay, you may need to reposition the transmitter panel or add additional IR
emitters to the TX90 system.
Buzzing or humming noise in sound system.
uCheck for ground loops or noise on the input signal. Call your Authorized Williams Sound dealer or
representative.
NOTE: Make sure the powerline voltage does not fall below 90V, or system performance will be
greatly reduced!

14
Limited Warranty
Williams Sound products are engineered, designed, and manufactured under carefully controlled conditions to
provide you with many years of reliable service. Williams Sound warrants the Sound Plus™ Infrared Listening
System against defects in materials and workmanship for FIVE (5) years. During the rst ve years from the
purchase date, we will promptly repair or replace the Sound Plus™ Infrared Listening System.
Microphones, earphones, headphones, batteries, chargers, cables, carry cases, and all other accessory
products carry a 90-day warranty.
WILLIAMS SOUND HAS NO CONTROL OVER THE CONDITIONS UNDER WHICH THIS PRODUCT IS USED.
WILLIAMS SOUND, THEREFORE, DISCLAIMS ALL WARRANTIES NOT SET FORTH ABOVE, BOTH EXPRESS
AND IMPLIED, WITH RESPECT TO THE SOUND PLUS™ INFRARED LISTENING SYSTEM, INCLUDING BUT
NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. WILLIAMS SOUND SHALL NOT BE LIABLE TO ANY PERSON OR ENTITY FOR ANY MEDICAL
EXPENSES OR ANY DIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES CAUSED BY ANY USE, DEFECT,
FAILURE OR MALFUNCTIONING OF THE PRODUCT, WHETHER A CLAIM FOR SUCH DAMAGES IS BASED
UPON WARRANTY, CONTRACT, TORT OR OTHERWISE, THE SOLE REMEDY FOR ANY DEFECT, FAILURE OR
MALFUNCTION OF THE PRODUCTS REPLACEMENT OF THE PRODUCT. NO PERSON HAS ANY AUTHORITY
TO BIND WILLIAMS SOUND TO ANY REPRESENTATION OR WARRANTY WITH RESPECT TO THE SOUND
PLUS™ INFRARED LISTENING SYSTEM. UNAUTHORIZED REPAIRS OR MODIFICATIONS WILL VOID THE
WARRANTY.
The exclusions and limitations set out above are not intended to, and should not be construed so as to
contravene mandatory provisions of applicable law. If any part or term of this Disclaimer of Warranty is held to
be illegal, unenforceable, or in conict with applicable law by a court of competent jurisdiction, the validity of
the remaining portions of this Disclaimer of Warranty shall not be affected, and all rights and obligations shall be
construed and enforced as if this Limited Warranty did not contain the particular part or term held to be invalid.
If you experience difculty with your system, call Toll-Free for customer Assistance:
1-800-843-3544 (U.S.A.) or [phone] (Outside the U.S.A.)
If it is necessary to return the system for service, your Customer Service Representative will give you a Return
Authorization Number (RA) and shipping instruction.
Pack the system carefully and send it to:
Williams Sound
Attn: Repair Dept.
10300 Valley View Rd
Eden Prairie, MN 55344 USA
Your warranty becomes effective the date you purchase your system. Your returned warranty card is our way of
knowing when your warranty begins. It also gives us important information about your system including the serial
number. This information will help us serve you better in the future. Please take a moment to complete and mail
the attached card. Thank you.

15
Dimensions, Weight: 11.25” W x 6.25” H x 2.125” D (28.6 cm x 15.9 cm x 5.4 cm), 1.8 lbs (0.8 kg)
Color: Black with white legends, black acrylic lens (available in white)
Power Supply: Wall Transformer, 24 VAC, 50-60 Hz, 35 VA, 3-pin MOLEX Connector
North America: TFP 010, UL/CSA
Europe: TFP 027-01, 2-pin Schuko plug, CE
UK: TFP 027-02, 3-pin UK plug, CE
Power Cable: NEC Class 2 wiring, two-conductor, 18 ga., 200’ (61m) max. length
Modulation: FM Wideband, +50kHz deviation max., 50uS pre-emphasis
Carrier Frequency: Channel A: Selectable, 2.3/2.8 MHz,
Channel B: Selectable, 3.3/3.8 MHz
Emitter IR Power: 3.5 watts
Coverage Area: 28,000 sq. ft. (2600 sq. m) in single channel mode when using the RX22-4 Receiver
18,000 sq. ft (1700 sq. m) in two channel mode when using the RX22-4 Receiver
11,000 sq. ft (1000 sq. m) in four channel mode when using the RX22-4 Receiver
3,500 sq. ft (325 sq. m) in single channel mode when using the RX15-2 Receiver
3,063 sq. ft (285 sq. m) in single channel mode when using the RX18 Receiver
Signal-to-Noise Ratio: >75 dB, +3dB
Frequency Response: 80 to 15,000 Hz, electrical response
Total Harmonic Distortion: Less than .2%, electrical response at 1kHz
Compression: Music preset 1:1, Voice preset 1.5:1, Hearing Assist preset 2:1
Auto Carrier Shut-Off: 20 minute timer shuts off carrier when no audio is present
Power Indicator: Red LED
Audio Volume Level Controls: CHA and CHB Input Level, press to select, 28 dB adjustable range
Audio Indicators: CHA and CHB Audio Level, yellow LED, ash
Carrier LEDs: 2 green LED carrier “on” indicators
Phones Output: 3.5mm TRS headphone jack. CH A tip, CH B ring on jack, 32 ohm headphone (min)
Application Preset: Music, Voice, Hearing Assist. Frequency response; Music: Flat; Voice: Mid-range boost; Hearing Assist: High frequency
boost
Tone Control: Press to select, 21 dB adjustable range (1 kHz between low boost/hi-cut and low cut/hi boost).
Power Input: 3-Pin Molex, 24 VAC, 50-60 Hz, 35 VA
Audio Input Connector: CHA and CHB, 3 wire Phoenix
Input Level: Balanced or unbalanced, 316 mVRMS (-10dBV) nominal, 5.7k input impedance; max input (over volume range) -21 to +7
dBV.
Baseband Output: BNC, 50 Ω, for use with TX9 only
Baseband Cable: RG 58 Coax, BNC connectors, maximum 1000’ (300m) length
Operating Requirements: 0-50º C (+32°F to 122°F) ambient temperature, non-condensing, non-corrosive atmosphere
Mounting Kits: Wall or Ceiling Mount: BKT 024 Omnidirectional mount; Optional: Mic Stand Kit: SS-10; or Tripod Stands: SS-11 or SS-6
Warranty: 5 years on transmitter, 90 days on accessories
Approvals: CE, FCC, RoHS, WEEE
Compatible Receivers: WIR RX22-4 Four-Channel Receiver, WIR RX15-2 Two-Channel Receiver, WIR RX18 Two-Channel Receiver
Notes: Specications: Single end input, volume & tone controls at mid point, 1 kHz, “Music” Preset
SoundPlus™ Infrared Listening System Specications
Model WIR TX90
Infrared Transmitter, Model WIR TX90
Visit our website for the latest specications and publications: www.williamssound.com
NOTE: Specications subject to change without notice.

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©2011, Williams Sound MAN 119G