Overview

This repair follows the Line Cord repair.

Current Problem

After asking some questions about the Western Electric 2012C Transformer and related phone/home wiring questions, I discovered that my line cord repair was not quite complete to allow the phone to ring.

"The taped up yellow lead in the plug is for the ringer--notice the black ringer wire on G inside the phone. So if you want the phone to ring, you'll need to connect the yellow wire in the plug: It goes in the slot adjacent to the green wire. "

From Classic Rotary Phones Forum member poplar1

On This Page

• Starting Point
• Process of Repair
• Related Resources
• Repair Road Map

Here is what the socket type terminal assemblies looked like before repair:

Originally, each conductor / wire was crimped inside one end of the "socket-type terminal assembly" (the copper "H-looking part").

The remnants of this can still be seen in one corner of each assembly.

Using a safety pin to push remnants of old copper conductor / wire out of the crimped side of the "socket-type terminal assembly" (the copper "H-looking part").

The released copper conductor can be seen at the bottom left of the photo.

Then used a spade tip and safety pin to resize and reshape the opening.

A spade tip was used to keep shape and size while narrowing the socket-type assembly slightly to ensure fit into the block.

Only the GN assembly needed this step.

End result (top left corner).

This procedure was repeated for all the other socket type terminal assemblies (in case they are needed in the future).

The repaired areas now all fit a spade tip and fit into the block.

After removing electrical tape from yellow wire / conductor and cleaning with isopropyl alcohol.

Finished repair: "open" with spade tip terminals plugged-in to block / cord tip guide.

New for this repair: Yellow plugged into GN so that phone can ring.

Testing continuity of GN.

4010 B Network L1 --> Green wire - line cord --> Spade tip terminal inserted in GN slot in 505A plug.

Testing continuity of Yellow at GN.

4010 B Network G --> Yellow wire - line cord --> Spade tip terminal inserted in GN slot in 505A plug.

I also tested the continuity of R, BK, and Y (White) on the four prong 505A plug, but did not photograph it.

The results of the first and second plug-in revealed some ringer issues.

Related post/message on the Classic Rotary Phone Forum:

• 505A plug repair: Socket type terminal assemblies

Related Bell System Practice (BSP) Documents:

• 461-630-105-i1-Plugs-for-Portable-Telephone-Sets Tl (Feb 1967)
• 461-630-105 I2-Plugs-for-Portable-Telephone-Sets Tl (Feb 1969)

Additional 702B BSPs are on the Resources page.

The project / repair links on this website can be found here (in order of repair):

1. Line Cord Repair
2. 505A Plug Repair
3. M1A Ringer Repair
   1. Before Adjustments
   2. After First Adjustment
   3. After Second Adjustment
   4. After Bias Spring Adjustment
   5. After Third Adjustment
4. Ringer Repair Videos