How to convert N Gauge CJM Class 89 to DCC

This guide covers the following models:

• CJM Class 89 (based on a Minitrix Class 47 chassis)

Step 1 - Remove Body

First, unclip the body by gently pushing upwards.

Step 2 - Disasseble Chassis

Remove the two screws and the top metal piece.

Remove the two weights.

Push the bogie pins out, drop the bogies out then put them aside.

Step 3 - Remote Motor

Remove the two metal clips holding the motor in. Push in the two plasic clips that are holding the drive shafts in. Remove the motor.

Desolder the wire from the side of the motor. You can either remove the other end of the wire from the wiper board and solder a new, longer one on. Or if you aren't brave enough with the soldering iron and don't want to risk damaging the underfloor detail plastic then you can simply extend it with a black wire.

Step 4 - Connect Motor

Solder an orange and grey wire to the motor.

Step 5 - Isolate Chassis

Place a piece of kapton tape across the chassis side where the motor contact was previously touching. The aim is to isolate the motor from the chassis.

Refit the motor and drive shafts.

Use a multimeter to check there is no continuity between the motor wires and the chassis.

Step 6 - Reassemble Chassis

Refit the weights, followed by the metal piece on top.

Connect the red wire to the chassis, either by trapping it under one of the two screws, or using a solder tab.

Route the wires towards the cabs at the pantograph ends, there's more space there. Add some tape to keep the wires neatly in place.

Step 7 - Connect Decoder

Solder the four wires to the decoder. Add some kapton tape to protect it, and then secure to the end of the chassis using some black tack or glue.

Step 8 - Refit Body

Refit the body, and the conversion is complete.