Question about Panasonic KX-T7730 Corded Phone

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Panasonic KX-t7020 - Sp-Phone light flashes constantly

Have a KX-T61610 Electronic Modular Switching System with 10 KX-t7020 hybrid system phones hooked to it. Has worked flawlessly for years. Recently tried to hook up two identical phones to a single internal line (so I would have two phones in same room sharing an internal system phone line). Phones work....suspect some features will not (seems to get confused on call waiting and when flashing to pick up second call).....but my major annoyance is the constant flashing of the SP-Phone light that never stops. ANY phone hooked to either of the RJ-11 jacks in that room will instantly do the same...indicates to me that the signal for the flashing is coming from the Modular Switching System box. It is not a function of how the phones are programmed, as you can move them to another location and everything is fine. I have the installation manual for the KX-T61610, but cannot find any reference to such performance as an indication of 'xxxxxx' so that I can begin troubleshooting. I have returned the system wiring to original configuration, yet any phone now connected to the RJ-11 jacks in that room will start flashing the Sp-Phone light.

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  • pjinserra Jan 04, 2009

    Went back to original wiring configuration, reset the 61610, wired each phone separately back to the switching unit. Everything works damage to anything.




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First of all, UNPLUG one of the PITS phones. A 61610 only allows you to use one system phone per jack. The damage is probably not permanent, but I'd look at how you wired those jacks together. The voltage on each pair of a jack can be measured; it's 24 volts DC for the center pair (red/green) and about 13 volts for the data pair (black/yellow) and nothing between the voice and data pairs.
I'm guessing that you may have crossed or shorted one of the wires.

The power of a station is in an odd/even arrangement. Go back to the cabinet and uplug the two extensions that feed your jacks and its mate and test from there. If they both work, you're good to go, if not....16 minus 10 equals 6 :-)

You might find that if the ports are damaged, you can still use them for single line sets. Look at it this way, you had about 20 years of flawless operation.

You can use call pickup to share two phones in a room, 40 is all pickup, 43 answers the page, and 4+the extension number IIRC picks up a specific ringing phone.


Posted on Jan 03, 2009


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