Telephone schematic

Try swapping the tip and ring leads; I think the red and green ones that come out of the wall. (or maybe blue/white and white/blue.) I had a new install once that wouldn't dial out - I flashed the operator by flicking the swtichhook ten times, and asked her to connect me to repair service, and the service person said, "sounds like polarity". The service guy came out and fixed it in a matter of seconds.

Good Luck! Rich

do you have touch tone serivce on your phone line?> , fdo other tt phones work?

if you can hear the tones but they don't dial, then you may not have touch tone serivce or the tones could be off frequency or too low in level

Mark

Maybe a European phone? IIRC the tones _are_ different.

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

Yes, I have tone service, my other tone phone works ok. I haven't compared the tone amplitude of the 2 phones, might be too low of a level. I noticed my off hook voltage is a little low at around 5 volts, with the new phone. Maybe the new phone presents a greater load to the line, and drops the amplitude too far?

I tried reversing the line connections and the tones don't work at all, so that's not the problem.

I'll do some more checking.

-Bill

I think some old (dial era) phones needed ground on the yellow wire (G) in addition to the red/green (L1/L2). I have a 1967 model dial phone that I had to jump the G terminal to L1 to get it to work.

Other than that,

Matt Roberds

Followup #2: Before I looked up the link I just gave, I went and got a phone that was sitting in my garage, intending to give you the connection data from it. However, I hooked it up and had the same problem you did: it would talk with either line polarity, but the tones didn't work at all. On the base, it was stamped "2500MM". I compared it to the 2500MM schematic at the site I posted and it matched, but the wiring (especially the line connections) didn't match an old 500 C/D dial set I have. So... I undid all the wires and reconnected them per the 2500D schematic. The only difference was that since I don't have a yellow wire in the line cord, I connected the ringer black wire to L2. I also didn't have slate or slate-red wires on my ringer, just the red and black. Anyway, after I rewired it, I tried it again... talk, no dial... switched line polarity (green to L2) and it talked and dialed. Don't know if it rings, but I'm fairly sure it will, given that the ringer is right across the line.

Matt Roberds