No Recieve (RX) No Incoming SoundMake sure the amplifiers is powered correctly - If you are using batteries, confirm that they are good and placed in the battery compartment correctly. The + and - positions are marked in the amplifier's battery compartment. If you are using an AC Power Supply, confirm that it is plugged in and the power outlet is turned on.These amplifiers are NOT designed to work on telephones that have the dial pad in the handset nor will they work on cordless telephones. Check the on line compatibility guide to make sure the telephone is compatible with the headset.Confirm that the Headset / Handset Selector (or On / Off) switch is depressed with the colored indicator showing.Confirm that you have lifted the telephone handset (receiver) out of the cradle.Confirm that the telephone handset cable and the short cord to the telephone are connected to the correct jacks.Confirm that the Compatibility Switch is in the correct setting for your phone. You may want to try moving the switch through all of the positions until you hear a clear dial tone. Some phones can use more than one switch position, but only one will sound the best. Experimenting with various switch settings will NOT harm the amplifier or your phone.Background NoiseReduce the transmit level or mic volume on the headset amplifier or base adaptor unit.Also consider replacing a voice tube headset with a noise cancelling headset.No Transmit (TX) Callers cannot hear meIf callers cannot hear you, verify that your "Mute" (if applicable) switch/button is not activated.If you are using a headset with a clear plastic Voice Tube, check its position. It should be 2 finger widths in front of your mouth. Voice tubes can also become clogged. To check your voice tube, slide it off of the headset while on a call. If the caller can hear you without your voice tube, it means your voice tube is clogged and needs to be replaced.
Some amplifiers also have a microphone volume controls. Check your amplifier’s User Guide to locate and adjust your microphone settings. Confirm that the configuration switch of your amplifier is set to the correct setting for your phone model.
If you are using a headset on a cordless phone you may have low outgoing volume unless you are using a headset made for cordless phones, Click here to view the headset we have designed especially for cordless phones.Humming in Headset A hum on the headset can be caused by many different things. Please try the following:
Move the amplifier further away from any electronic devices that could be causing interference.
Check the power supply. Try a co-worker's power supply, or try plugging your power supply into a different electrical outlet.
A hum can also be caused by the settings on the amplifier. Please follow the instructions below to change your settings:
For wireless models:
Make sure that the charging base is plugged into the HANDSET port of the phone and not the HEADSET port. Adjust the configuration setting on the left side of the charging base.
For M10, M12, MX10, and M22 Vista amplifiers:
Remove the rectangular door from the left side of amplifier. Adjust the settings, 1-6, and turn down the dial.
For S10, S11, and S12 Amplifiers:
On the left of the base, move the configuration switch from 1-6 to see if the hum goes away.
For the A20 and S20:
On the left of the base, change the configuration dial, 1-4.
For the PLX500 amplifier:
Use screwdriver, located in the battery compartment, to adjust the switch on the back of the amplifier.
For the SP05 amplifier:
Use screwdriver, located in the battery compartment, to adjust switch.
You may want to try moving the switch through all of the positions until your caller can hear you clearly or the hum disappears. Some phones can use more than one switch position, but only one will sound the best. Experimenting with various switch settings will NOT harm the amplifier or your phone.