Installing a DCC decoder in a Bachmann Siemens 'Desiro' Class 350 EMU
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Before installing a decoder into any loco it is advisable to check the current being drawn by the loco. This 4-car EMU only requires one decoder, located in the motor car. The unit draws about 0.18 amps when running at maximum speed under DC control and 0.8 amps when stalled.
The motor car is the inner carriage with the pantograph. The model requires one 21-pin decoder and this installation guide uses the TCS EU621.
Manufacturers do, at last, seem to be getting the message that the interior of models needs to be more easily accessible in order that modellers can fit DCC decoders without fear of damaging delicate detail parts. Bachmann can therefore be applauded for meeting the challenge and putting the decoder socket UNDER the loco in its own compartment, so there is no need to remove the body.
The compartment is secured to the chassis with a single small screw. Once undone the compartment housing can be gently removed, exposing the blanking plug and space for a sound speaker. However, the downside is that space has only been left for a small circular speaker, the type which comes with Loksound sound decoders, rather than having space for a better quality and more effective bass reflex speaker.
Once the blanking plug has been removed it is just a case of installing the 21-pin decoder, making sure you get it up the right way and identifying pin 1 correctly.
In order for the lighting to work it is essential that the carriages are arranged in the correct sequence, using the letters A to D which are marked on the underside of the carriages.
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