Listen Technologies LA-161, LP-3CV-072, LR-200-072, LT-803-072, LA-123 90 manual Troubleshooting

SupplementaryLT-800

Troubleshooting

Troubleshooting

The LT-803-072 has no power.

Make sure the 12 VDC power transformer is connected to a power source and is connected to the jack marked “Power Input”. Make sure the PWR button is pressed in.

There is no audio or the audio level is too low.

1. 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 -10 dBu position. If it were to be in the +10 dBu position, the level would be too low. Also, check the Input knob to ensure it is properly adjusted. You should be able to see illuminated lights on the VU meter 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.

2.If the level of audio into the transmitter is low and cannot be corrected using the level input switches, the audio processor can be turned on to boost the signal (see page 28 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 LT-803-072. Check the connections from the audio source to the LT-803-072. If you can, try to use a balanced audio source - this will reduce the chance of creating hum. Connect a ground wire from the LT-803-072 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 ¼ in. plug is grounded .

I cannot pick up the signal on the receiver.

Check to make sure the receiver and the transmitter are on the same channel. Make sure the LT-803-072 has an antenna connected. Ensure that the receiver has an earphone connected.

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 the LT-803-072, press the UP button for 3 seconds.

There is not sufficient range.

First make sure that the receivers you are using are operating properly, then make sure that you have an antenna connected either to the top of the LT-803-072 transmitter or connected to the back of the unit (but not both!). The antenna should be as high as possible and free of obstacles. In addition, make sure you are using the correct antenna type for your unit. You might want to use a remote antenna [LA-122 Universal Antenna Kit (72 MHz) or LA-116 Coaxial Dipole Remote Antenna (72 MHz)] that can be mounted on a mast or wall. Try using different frequencies to find one with less interference.

(see page 25 for information regarding channel selection)

52