Troubleshooting - Phonak TX-300V User Manual

TX-300V Troubleshooting
The TX-300V has no power
Make sure the power transformer is connected to a power source and is connected to the jack marked
"Power Input". Make sure the POWER button is pressed in.
There is no audio or the audio level is too low
Make sure that your audio source is properly connected to Input 1 and/or Input 2. The Input 1 or
Input 2 switches must be in the correct position for the appropriate input level. For example: if you
are using the output of a mixer on Input 2, the switch should be in the -10dBu position. If it were
to be in the +10dBu position, the level would be too low. Also, check the Input knob to ensure it is
properly adjusted. You should be able to see the VU meter deflect on Input 1 or Input 2
corresponding with the input level of the audio source. You can listen to the audio source by
connecting a headset to the front panel jack and adjusting the Monitor volume control.
If the level of audio into the transmitter is low and can't be corrected using the level input switches,
the audio processor can be turned on to boost the signal (see page 7 to set, page 9 for description of
Process Mode).
The audio is distorted
Check to make sure you have the input level select switches in the proper position. You may be
providing too much audio level for the input stage to handle.
There is hum in the audio
Make sure you have properly grounded the audio source to the TX-300V. Check the connections from
the audio source to the TX-300V. If you can, try to use a balanced audio source - this will reduce the
chance of creating hum. Connect a ground wire from the TX-300V to ground and/or to the ground of
the source audio.
There is a tone
The Test Tone button has been pressed (its LED light is on). Push the Test Tone button to turn off
the tone.
The Audio Input 1 sounds "tinny"
If you are using an unbalanced audio source, make sure Pin 3 on the XLR or the ring on the phone plug
is grounded.
I can pick up the signal on the receiver, but it sounds like it's not tuned in
Check to make sure the transmitter and receiver are on exactly the same channel. It's a good idea to
lock the channels once they have been set. To lock theTX-300V, press the UP button for a 3 seconds.
End users are adjusting the unit
First, lock the channel by pressing and holding the channel select UP button for 3 seconds. Consider
removing the Input, Mix Level and Contour knobs. You can order a rack mount kit part number
116-1940 from Phonak which offers a security cover that will limit access to the unit.
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