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And that is why I made the suggestion of flipping tip and ring where they are connected to the network.

It's entirely possible that the contacts are dirty on the back of the dial. I've had to clean more than a few to get them working.

I knew the spades were going to be attached to those plastic strips, which is why I thought of flipping t&r at the network if it's only this phone. Maybe someone flipped them before, who knows. These things are all pushing 40+ years old. There's no telling who's been in there poking around. My advice is get the BSP, make sure everything is wired as it should be, if not, correct it, then move on to cleaning the dial contacts. No sense in beating your head against a wall if someone has changed a bunch of wires around. Make sure it's wired like it just left the factory, then start the real troubleshooting.

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Originally Posted by Touch Tone Tommy
It is highly likely that you have Tip and Ring reversed at the block for all 4 lines but not for the Intercom, and the other phones you have tested have polarity guards either built into the touch tone pads or installed as an adjunct.


Given that you can't easily swap those wires around..... The fix isn't to start cutting them off the strips and rearranging them.

Using a voltmeter, put the black probe on the white wire with the blue tracer, and the red probe on the blue wire with the white tracer. If the polarity is correct you should see a negative voltage somewhere around -48 volts DC. If you have a positive voltage, they're backwards at the block.

I don't know what your source of dial tone is, but if they are real phone lines or at least decent ATA's, you should get around -48 volts on hook voltage. Most add on intercoms only supply -24 volts but it works just fine. Check each line pair the same way. Each column of terminal screws is laid out the same way. The top two screws are tip and ring for each line. Tip is closest to the back of the phone. (Someone correct me if I'm coming down with CRS syndrome)

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When you said that the conductors are connected to a "board" I assumed you meant the terminal area of the key. Now I see that you meant the wafers that allow the assembly process to go more quickly.

"I hear tones, they sound correct, but CBDT and this only happens on the 4 lines, intercom line work fine."

So, the dial generates the correct tones, and the intercom operates correctly. In the old days, the DTMF receivers in a CO were much more forgiving to frequency variations than the cheap(er) receivers in a local intercom. Nowadays, I'm not sure about the ATA's.

You hear tones when on a CO line, but you CBDT. The next thing to do is to put two sets on the same cable, press the same CO key on both, press the same TT button on both, and listen for a "beat." The suspect dial may be just a little off frequency. The adjusting slugs on the back of the dial can fix that.

Other than that, I guess 52 years of experience is not enough. I'm stumped.


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Thanks for the help guys.

I tried flipping the tip and ring on the network with no luck. So I had a idea of making a cross over cable for each line to reverse the tip and ring and it worked!!!!! The good part that the reversal of the tip and ring did not effect the other phones on the system.


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