This installation of TCS M4 Decoder is for HO Scale ROCO 4154 BR290 and was performed by Ric Bogart of Osborne Park W A, Australia
Although this is a fairly large diesel there is very little room inside this model .I had intended to install a T1 decoder but it was about 2mm to long. A TCS M4 was used instead. A M1 decoder could be used as well.
1. First, remove the cover off the loco (as per the operating instructions for the service of the unit) Lift the locomotive casing and remove.
2.At this point the original wiring and components can be unsoldered .Removing the diodes isolates the lights from one side of the track power pickup. Removing the RF chokes isolates the motor.
3.Following the decoders instructions the red wire -----to the right side rail
pickup orange wire -----to the motor circuit where the choke was black
wire ---- to the left side rail pickup grey wire ------to the
motor circuit where the choke was ----- yellow to the rear headlight
-------white to front headlight (the lights were connected in half wave mode
powered from the track).
4. Decoder is held in place with a small amount double sided tape.