Information Bus: Service and Repair

Communication Circuit Wiring Repair
The following procedure is to be used to service both the twisted pair wiring and single wire communication circuits.

Durability of a wire splice is dependent on getting a joint that does not oxidize. Soldering is effective in keeping the air (oxide) out of the joint electronic circuits. Very high current circuits may fail because of oxidized joints that are not visible with the naked eye.

Durability of a splice is also dependent on keeping the moisture out of the joint. Heat shrink tubing alone won't do it. The tubing must contain a "hot melt wax" which is squeezed from the ends (both ends) of the tubing during heating and forms an adhesive seal between the wire insulation and the tube.

NOTE: Use a heat gun only. Do not use a hair dryer or any type of flame to heat the shrink tubing.





1. Correctly strip the wire.





2. Twist and solder the wire. Use resin core mildly activated (RMA) solder. Do not use acid core solder.

NOTE: Install heat shrink tubing first.





3. Form (bend) the circuit into shape for sealing.





4. Reposition shrink tubing over splice.





5. Use Rotunda Heat Gun, 107-R0301 or equivalent to heat the entire length of the shrink tubing until the hot wax comes out of both ends. When the hot wax flows out of both ends, remove heat.