Maintenance tips for Optimum Performance
Replace voice tube every 6-9 months (voice tube models only).

Replace ear cushion every six months.

Clean cable with a damp cloth once a month. (Do not use solvents or wet cloth.)

Troubleshooting
Callers cannot hear me
For voice tube models determine if the voice tube is positioned improperly. Try various other positions.

To determine if the voice tube is clogged, remove the voice tube and see if the caller can hear you. If the caller can hear you the voice tube was clogged.

For a temporary solution to a clogged voice tube, gently rinse warm water through the voice tube for a minute then manually swing or shake it dry.

Make sure the voice tube is completely dry before reattaching. Plantronics recommends replacing the voice tube every 6-9 months.

For Noise-Canceling models make sure the microphone is facing your mouth and positioned properly.

Verify that the transmit volume control of the amplifier is set properly.

I cannot hear callers
Verify that the Quick Disconnect is connected.

Make sure the headset is positioned properly.

Make sure the amplifier, if used, is installed correctly. Turn up the volume control on the amplifier, if used. Change amplifier's configuration switch to a different position.

Fit is uncomfortable
Make sure the headband length is correct.