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cmcbd4 Offline OP
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Receives calls but dial pad has no tones. There are two wires with factory ends that were taped off coming out of the keypad (orange and lavender) I don't know if that has anything to do with the problem. Any input would be great.

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Anyone have a wiring diagram? Have to tried cleaning the dial contacts?


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OK, here you go. This is for the -DM configuration, but since I doubt you will need A-leads, this should be all that you need:

Dial leads:

OR/BK: Network terminal C with brown switchook lead;

GN: Network terminal F with white switchook lead;

BK: Network terminal RR;

RD/GN and WH: Network terminal R with red switchook lead;

BL: Network terminal B with black handset lead;

WH/BL: Network terminal S (or any blind terminal) with green handset lead and black switchook lead;

RD: Network terminal T (or any blind terminal) with red handset lead;

Other connections:

WH lead from handset: Network terminal GN;

GN lead from switchook: Network terminal L1 with green line cord lead and black ringer lead;

YL and SL leads from switchook: Network terminal L2 with red line cord lead and red ringer lead.

SL lead from ringer coil: Network terminal K;

SL/RD lead from ringer coil: Network terminal A

***Insulate and store the following dial leads separately***

GN/WH
VI
OR


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Have you got the polarity correct?

-Hal


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Sorry to confuse the issue, but I do have the BSP pages for the 2500M / 2500MM / 2500MMG and they differ from what Ed posted. I can PM or post a 6 page PDF, but basicilly I show the following for the 2500MM:

Dial leads:

OR/BK: Network terminal C with white switchook lead;

G: Network terminal F with ringer B and green line cord lead ;

BK: Network terminal RR;

RD/GN: Network terminal R with black switchook lead and handset W;

W: Network terminal GN;

BL: Network terminal B with black handset lead;

WH/BL: Network terminal S (or any blind terminal) with green handset lead and red switchook lead;

RD: Network terminal T (or any blind terminal) with red handset lead;

Other connections:


GN lead from switchook: Network terminal A with red line cord lead;

YL lead from switchook: Network terminal G with yellow line cord lead.

BR lead from switchook: Network terminal L1 with black line cord lead.

RD lead from ringer coil: Network terminal K;


***Insulate and store the following dial leads separately*** (Wires not shown on my print)

GN/WH
VI
OR

Note that the White and Blue Line cord leads were optional connections to the ringer and normally taped off.

PDF file available at:

https://www.jknichols.net/db5/00440/jknichols.net/_uimages/2500M.pdf

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That is not a problem at all and you certainly are not confusing the issue. I was just recalling the -DM equivalent (non-A lead) wiring from memory. Thanks for posting the real stuff.

By the way, I suspect that the dial was replaced at some point with a speakerphone-compatible one and the spare switching leads were just insulated and stored. I'm sure that's why they didn't show up in your diagram.


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Also, the 2500MM originally had a type 35 dial that WAS polarity sensitive, but could be upgraded to a 2500MMG with a type 71 dial that did not care about polarity - can you find a code number on the dial with either 35 or 71 in it?

Correct me if I'm wrong, but I think that the Red (ring) wire should be negative 48 volt relative to ground and the Green (tip) wire should be close to Ground

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That's correct but the easy way to check is to just reverse them (T&R).

-Hal


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Several years ago we used a "polarity guard" on a customer's 2500 set that was plugged into an extension port on a Picazo system.


Bob

With all the variables involved, I am amazed when any voice and data technology works like it is supposed to.
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