IQ CS540
Installation and Troubleshooting
This guide was created to assist you to successfully connect a Plantronics CS500 series headset to
an IQ750EHS desk telephone.
Please see the numbered steps below and diagram on the following page. At the end of this guide
is a trouble shooting section.
First-Time Installation
At this stage nothing should be plugged-in: no power, no line cords (etc.), although it is fine for the
telephone handpiece to be plugged into the left side of the telephone as that will have no effect on
the setup.
1. Plug the power into the wireless headset base and place the headset in the cradle for 1-2
hours (do not plug in the telephone and, if you do, you will have to unplug the line cord and
power before going to stage 2).
2. Once the headset is charged, plug the short black EHS cable (cable is supplied with the
telephone not the headset) into the side of the telephone in the socket marked EHS (make
sure the body of the plug is horizontal so that the silver part of the plug is fully inserted). The
other end of the cable will plug into the back of the wireless headset base (you can't make a
mistake it will only fit in one socket).
3. Plug the audio cable supplied with the headset (has a square box in the middle that we don't
use) from the wireless base to the headset socket on the rear of the telephone.
4. Look under the rear of the telephone and make sure the V-P switch is set to P (usually on V
out of the factory).
* Note: do not plug in the telephone into the power or telephone line at this stage!
5. Underneath the wireless headset base (the part the headset sits on to charge), make sure
that both round red dials are on "3" and the A,B,C,D red slider is on "A".
