clockwise to decrease the input signal strength. Make sure the “HI” audio light is not on
continuously.
Symptom:
Sound through the receivers is weak and noisy.
1. Turn the screwdriver-adjust input level control located on the T21 front panel clockwise to
increase the input signal strength until the audio indicator light flashes. The audio fed into the T21
may be noisy or weak. Use a headphone in the Phones jack on the front of the T21 to listen to the
input signal. If it is weak and noisy from the phones jack, turn up the appropriate mixer control or
try a different audio source.
2. Increase the input signal level from the sound system by turning up a mixer control.
3. Make sure a valid wide-band channel is selected and make sure the transmitter and receivers
are tuned to the same channel.
Symptom:
Buzzing or humming noise in sound system.
1. Try moving the “RF Power” switch to the -6dB or -12dB position. This will reduce the system range
somewhat.
2. Some amplifiers and mixers are susceptible to RF pick-up from the transmitter. Call your
Authorized Dealer or Williams Sound for help.
Symptom:
Scratchy noise when receiver volume control is adjusted.
1. Open the back of the receiver case by opening the battery compartment. Keep lifting on the
battery door and the back of the receiver case will open like a book.
2. Remove the screw from the center of the volume control and remove the knob.
3. Lift the clear plastic cover on the control and spray GC SPRA-KLEEN, LPS Contact Cleaner, or
equivalent into the control. Replace the knob and rotate the control several time.
4. Replace the screw and close the case.
Radio Interference:
The PERSONAL PA is usually not disturbed by other radio services, however there is no such thing as
a clear or exclusive channel for ANY radio service. One of the unique features of the Williams Sound
PERSONAL PA System is that the operating frequency can easily be changed in the field to avoid
interference. There are 10 wide-band and 50 narrow-band frequencies for hearing assistance use.
The PERSONAL PA can be quickly changed to any of these frequencies by your Williams Sound
Authorized Dealer. The Transmitter is changed first. Then the signal produced by the Transmitter is
used to tune the receivers.
Transmitter Frequency Change Procedure:
(1)
Set the two rotary “Channel” selector switches to match the desired channel listed on the
chart on top of the transmitter. One of the 8 wide-band channels must be selected for use with the
R7, R7-4, R7-6, R700,or R16 Receivers. The narrow-band channels are available for use with a
narrowband receiver that will be available in the future.
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