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Towards the bottom of the page, click on the tab labeled ADDITIONAL INFORMATION. Within that section, you will see PLANTRONICS CS50/CS55 INTERACTIVE USERS GUIDE to click on. This will help you visually see how to setup and start using your CS55.
The first thing to try is resetting the CS55. We hear this a lot and once reset, it usually takes care of the problem. It's equal to a ctrl+alt+del on a computer. Click on the following for detailed instructions and photos:
This how I fixed it 1) set bottom mic to A 2) set dial on the side of CS55 to "Setting 1" most typical 3) set sound lever on the back to "1" 4) played with mic control on the back until quality became sufficient
If the Plantronics CS55 wireless headset shows that it is on, you have to make sure of the following things.
a. the green LED on the base turns on when you turn the call switch on from the headset. b. the small green LED on the side of the headset is blinking. c. the telephone headset is lifted from the cradle. d. if the headset is not charging and the Amber light on the base does not blink when you place wireless headset on it; trying placing the headset more firmly. e. If the headset is not charging and the Amber light on the base does not blink even after placing the wireless headset firmly on the charging cradle, you may need to change the battery.
Alternately you can try resetting the Plantronics CS55 wireless headset.
Reset Plantronics CS50, CS60 or CS55 Wireless Headset
If you have problems with the sound or connection of your Plantronics CS50, CS60 or CS55 wireless phone headset, you may want to try to hard reset it using the following steps:
Note: Ensure the IntelliStand switch (on the right side of the charging base) is in the - position and NOT the = position.
1. Press both the call control button and the listening volume/mute button for 5 seconds. When the indicator light blinks release both buttons.
2. Press the call control button again. The talk indicator light will again blink to indicate the headset is back to normal.
3. Disconnect the AC charger from the AC charging jack for 5 seconds.