Question about Plantronics Discovery 640 Wireless Headset

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Earpiece vibrating & heating

My plantronics640 earpiece starts vibrating when I try to charge it then sometimes when its not charging it gets very hot when I haven't had it to my ear & wont stay charge that long. I don't have the manual for it anymore.

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Do you know if the codes of the headsets are the same i lost mine and i need help

Posted on Aug 24, 2007

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Posted on Jan 02, 2017

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Do you have a spare cable to try charging it with?

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Could be a battery problem, ut is usually a problem with the charge cable or connector. Try a different charge cable, they are usually Micro USB connectors, and check if the power (MaH) Matches what your phone needs. Otherwise you might need to repair the port. Try this.

http://www.youtube.com/watch?v=q4e-5xkhvHA

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Here is a how to video to open up the earpiece and replace the battery if needed. While you have the earpiece open you can check the the battery with a volt meter to see if it's holding a charge. The stock battery for this earpiece is 3.7v and 195mAh.
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Are these amplifing headphones or ? Most headphones use the devices power source to make the headphones work, they use very low voltage and various ohlms to make the earpieces vibrate and make sound. If they are not working try pushing the connection in all the way, or try another set of headphones to see if the problem is with the device. Sometimes we get defective headphones right out of the box, Skull Candy is usually very reliable and quality checked before shipping, but it can happen with all manufactures. Gool Luck.

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If there is a battery in the earpiece; is it safe? There is some controversy about the safety of holding a cell phone to one's ear for extended periods; that's why I wanted an ear piece.


Yes it is perfectly safe. The easiest way to identify whether a bluetooth set is malfunctioning or unsafe is - HEAT. Normally batteries which are about to die or devices malfunctioning will heat up quickly when you charge it.

So unless you dont feel abnormal heat.. they are perfectly safe. Try to remove the BT earpiece when not needed. Your ear canal needs natural air flow. Blocking it with a prolonged use of a BT device could heat up the ear canal. That's where the problem starts! :-)

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1 Answer

Lost manual need to charge my earpiece


Need more information...what earpiece are you using? Does it have the same charging port as your phone? Chances are your earpiece charges through a micro-usb port. If this is the case, you can easily find a new charger that is of size micro-usb (that is the same size as the charger of most new cellphones).

Feb 28, 2011 | Cell Phones

1 Answer

Hi, i am using Nokia 9300. My problem is that even when i charge my battery to full capacity, it drains out after a few calls...if i dont make any calls, d battery lasts longer, not what it should though....


tray to change your battery first.if still like that, the damaged are in PA (power amlifier IC) that phone used to transmitting.the sign off PA not good any more: we feel heat on our earpiece when we make a call,some times there were a noissy sound on earpiece.

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LG phones have this weakness of getting heated up while charging and even sometimes while on a call. Try to put charging on the power socket that has enough grounding

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probably the wire from the charger is bad. Try to replace the charger

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no solution sorry
wait for another members
greetings from algeria ;)

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