Installing a DCC decoder in a Hornby Class 50 Diesel Locomotive

Click on each image for a more detailed view.

Class 50 heating cables

Before installing chip into any loco it is advisable to check the current being drawn by the loco. You should test the current drawn when the loco is stalled to find the peak current and select a decoder that will cope with that maximum current requirement.

Before attempting to remove the body of the loco, disconnect the electric train heating system cables from each cab end.

Releasing body from Class 50
On the Hornby Class 50 there are no screws securing the body to the chassis. Gently lever away the body at two points on each side of the loco, as show in the photo. This can be done using fingers. As you prise the body from the chassis make sure the body is levered evenly, rather than tilting at each end.
Class 50 dummy plug
Installing a decoder in this loco is really very straightforward. Gently remove the PCB in the NMRA socket by levering it out from each end with a flat screwdriver.
Class 50 with decoder installed

Once the existing PCB has been removed it is obvious which way round the new NMRA board should plug into the socket as pin 1 is labelled clearly on the underlying PCB.

As with all of the latest Hornby diesel locos, the board has 12 pins available, but only the 8 pin socket is required for the decoder to plug in to.

The MC2UK decoder installed in this loco was fixed using a double-sided self adhesive Sellotape pad, as shown.

Before replacing the body, program the CV settings as required on the programming track and test the loco on the main line or a rolling road.


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