The installation is for HO Scale Bachmann FP7-B Unit . It uses TCS T1 decoder and was performed by Robert Lewis of Tilehust, Reading, United Kingdom


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

http://www.techni-tool.com


Picture FP-1.  This is a Bachmann FP-7 B unit, it is totally standard. I have fitted a TCS-T1 decoder.
To remove the body remove the 2 crosshead screws between the bogies and the fuel tank, in the deep recesses. Also remove the 2 crosshead  screws that hold the dummy fuel tank in place. The body should lift straight off.

Picture FP-2. The chassis is of the "live" type, where current is passed through the body from the bogie pick-up to the motor.
Disconnect the 2 black wires from the top motor contact, remove the crosshead screws from the top bogie mounts, the bogies can then be removed, the pick-up wire passes through a small hole in the casting. The motor can now be removed, it is only held in place by the grey packing foam. the motor can be a tight fit so a push from underneath maybe required.

Picture FP-3. To insulate the motor, and the brush contact from the chassis I have inserted 2 strips of plastic sheeting, cut from some packaging. I have also drilled a small hole to enable the fitting of a self tapping screw to hold a solder tag. Solder the Orange wire to one motor terminal and the the grey to the other. I have insulated and tied back the unused wires with rubber sleeving.

Picture FP-4.  Using the original packing foam, push the motor back into the chassis, ensuring the plastic strips remain in place. Feed the black bogie pick-up wires back through the chassis holes and then re-fit the bogies and their retaining screws, do not over tighten these screws or the bogie will not be free to move.
Solder the red decoder wire to the solder tag and then screw to chassis. Join the 2 black pick-up wires to the black decoder wire, make sure this joint is well insulated. I have taped the decoder to the chassis. Now test the installation. Refit the body and fuel tank.


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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