Step 6: Troubleshooting
Make sure the cable works:
Find a phone where you can hear the dial tone. Now hang up and replace the line with the cable you plan to use, check to hear a dial tone now. If not then your cable is bad.
Make sure the phones work:
Temporary replace your home phone with one of the project phones, check to hear a dial tone. Then make a call to see if the microphone and the speaker work in the handset. And to see if the handset has a charge if it applicable. If you fail to make a call for any reason the phone is bad.
Make sure the Coupler makes a circuit:
Take the battery out of the coupler. The battery must be out. Then go to a working phone and make the connections in this order
Wall jack------> to cable -------->to the Coupler-------->to another cable------->to phone
This will check if you connected the right wires in the coupler. Pick up the phone and listen you should hear nothing, if you do here a dial tone then the wrong wires are soldered, or you have short in the coupler. If you move the coupler and you hear scratching sounds then you have a bad connection, and must re solder or better insolate.
If you hear nothing that is a good sign so far, now take a screwdriver or something metal and complete the circuit at the 9v battery connector. You should hear a dial tone now. If not then your connection on the red or green is just broken somewhere and you have to find it.
The green wire is just a straight shot; you do nothing with the green. The red wire is in series with the 300 ohm resistor and a 9v battery. Make sure its set up like this. I hpe this was helpful, drink your milk and have fun.