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

Important Soldering Tip:
Please do not use any flux either liquid or paste on the mother board. It will damage it. Use only Rosin core solder approved for electronics use.
We recommend to use only Kester "44" rosin core, SN63PB37, .015" diameter, part number 24-6337-0007.
This can be ordered from Techni-Tool under Techni-Tool part number 488SO157

 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.  

5. Re-assemble

Other solder tips: When stripping wire, only strip a tiny little bit of the insulation. Strip no more then a 1/64 of an inch. When the wire gets tinned with solder the insulation will shrink back more. Try to not expose any more wire then half the length of the solder pad at most. In no case should solder or exposed wire wire ever be outside the boundary of the the solder pad you are attaching a wire to.
Click here for important information on properly Stripping and Tinning wire

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