Question about Polycom ViewStation ISDN (pcy220011323001) Video Conference

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I need a circuit diagram for a polycom viewstation 128. Or someone who knows how to fix the unit where the microphone is constantly muted. The microphone works in another unit ok. The cable used to connect the mic was not the correct cable, so it looks like it has damaged the mic cct in the viewstation. Regards Laurie.

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  • lwebster189 May 11, 2010

    Thankyou for your reply but unfortunately it missed the mark.

    The problem lies in the Viewstation 128 itself as the MIC Pod works on another viewstation ok.

    As far as I know the MIC Pods have 3 mics in them and have circuitry to relay the audio back to the viewstation digitally. I think the only way to fix this fault is if I can get hold of a circuit diagram.



    Regards Laurie.

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Hi,

when you get into the site scroll down to see where to download from

search-manual-online.com/polycom-viewstation-128-manual.html


the one below needs to be purchase

smartdraw.com/examples/view/Electrical+Circuit+Diagram.

hope it was helpful.

Take care.

Posted on May 11, 2010

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Www.ivci.com/.../videoconferencing_polycom_viewstation_user_guide.pd
The microphone is called an "Electret Mic", this has a capacitance microphone, and an internal amplifier all in one package, These require a 5 - 12 Volts DC working voltage, and indeed go faulty, very easy, as you related. You can get these Microphones from Radio Shack or similar, they are very common. They have a positive and a negative, the case is always negative, the center cable is usually Positive, with the outside or Shield, and easy to re-solder. Check, the circuit, and make sure polarity is correct, and/or the cable isn't broken, or otherwise wrong. There are usually only two connections, so you shouldn't have too many problems troubleshooting, You should have 5 VDC on the lead that goes to the Mic, and the Mic, should have a resistance of about 1 - 2 K Ohms.

http://www.polycom.com/support/video/other_video/viewstation_sp128.html

FYI below
.http://en.wikipedia.org/wiki/Electret_microphone

Posted on May 11, 2010

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