The following guide is for the fitting of a standard Hornby decoder into the R2474 BR Class 50 locomotive.

Step 1. Carefully remove the body by gently pulling the body sides apart and then pulling the chassis down.

Step 2. Remove the decoder from the protective packaging, taking care not to handle the PCB directly as static electricity will cause irreparable damage to the decoder. It is important to protect the decoder by wrapping the PCB with insulating tape. However, the R2474 Class 50 is supplied with a piece of insulating sleeve which is designed to slip over the PCB and will protect the decoder. Using a small piece of insulting tape cover the bare end of the purple wire, however this wire maybe shortened if required.

Step 3. Locate the decoder blanking plate.

Step 4. Carefully, lever off the blanking plate from it’s socket ensuring that you do not damage the surrounding components.

Step 5. With the blanking plate removed an 8 pin socket is now visible. Note the location of “Pin 1” indicated by the number “1” and an “Arrow” printed onto the socket.

Step 6. Carefully insert the decoder so that the pin connected to the orange wire is inserted into Pin 1. Make sure all pins are properly located before pressing home.

Step 7. Attach the decoder to the chassis of the locomotive using a suitable method, such as a piece of Blue Tack. Ensure the decoder wires do not foul the body or have the potential of being caught in moving parts. Make sure all the wires are properly insulated as they may cause a short circuit when the body is replaced.

Step 8. Once the decoder is located, place the locomotive on the programming track and test to make sure that the installation has been successful. Remember that the decoder has a default number of “3” and it is recommended that you code the locomotive to the number you require and test again.

Step 9. Once you are satisfied that the decoder is functioning correctly locate it in a suitable aperture ensuring that it is away from moving parts. Once installed, carefully position all wires so that they do not touch any moving parts. Use insulating tape if required.

Step 10. Carefully replace the body onto the chassis taking care not to trap any wires during this procedure. Test once more to ensure that the installation was totally successful.