I usually remove factory boards and hardwire all my decoders, that way I know exactly what I'm dealing with, whereas the factory board introduces inknowns into the circuit path. Modeling the Reading Railroad in the 's. Visit my web site at www. Check out the Bachmann Product Reference Page and look up the specific model you are dealing with. Often times the schematic will tell you what type of decoder is installed without having to remove the shell.
I have had great luck with Digitrax mobile decoders. For most, non-sound, installations I used the DHP , this is a great 2-function decoder. For a decoder with more function outputs I like the DHP with 6-functions. This mobile decoder can be soldered directly to LEDs without the use of resistors.
It is a 4-function decoder that is great for tight installations where the resistors might be too close a fit. You will need an image hosting site to do that. No idea if you have done that. The instructions are at the top of the Model Railroader General Discussion forum. The Bachmann website has loco diagrams but Bachmann does change canoes in the middle of the stream and change the onboard DCC for same locos.
The diagrams usually show a decoder lightboard or one with eight pin socket. I have been following the Bachmann website diagrams and forums since and have seen the differences. Just follow NMRA wiring plans. The decoders have instructions. No idea if the Bach-Dsl with fit. Was not aware Bachmann makes a dockside switcher. I have that loco. Runs slowly very nicely.
Remove the caps. The two green devices that look like resistors are 4. With no caps, they are essentially a straight piece of wire. Zero ohms. They form a filter circuit to satisfy the EU and UK. Go back to that link. There are many Bachmann conversions also.
Try to take time to look through links. I have the 70 ton with onboard DCC and my conversion was as involved, maybe more involved as mine included sound.
I made a styrene board to mount the decoder and used the front and rear LED's from the old decoder and included 1k resistors. I did not use the upper weight but made my own weights suffed into the top of the shell with a speaker and baffle. Thanks again Rich. If I can get to the trains this weekend My wife is undecorating the house from the holidays a multi day trip though Christmas Wonder Box land I will take off the shells and look around. After thinking about it a bit I think I will leave the steamer alone as it only runs excursions during the Holidays and convert the diesels.
The T was quite easy but I have been soldering for many years. Function Assignments: Bachmann sound-equipped locomotives contain most of the sound features found on aftermarket Tsunami, however the function mapping defaults have been customized for each locomotive. The differences between the decoders are listed below:. Econami SoundValue. Below are the Bachmann models that are currently equipped with Econami technology.
Spectrum HO Scale. Spectrum On30 Scale. Spectrum Fn3 Scale. Sound Value. HO Scale Steam. HO Scale Diesel. HO Scale Electric. N Scale Steam. N Scale Diesel. N Scale Electric. Operating in DC. Operating Your Bachmann Sound-Equipped Locomotive Using a Traditional Power Pack Your new locomotive can be controlled using an ordinary power pack, though its operation will be a bit different than when running locomotives that do not have a decoder installed.
With the power pack throttle set to 0 no voltage on the track , Tsunami will be silent. At this point, you will begin to hear the background sounds turn on.
The first sounds you will hear from the steam locomotive will be the blower and airpump sounds. Increase the throttle setting to roughly 7. This will set the locomotive in motion, increasing the speed of the engine as the throttle is turned up. You should start to hear additional sounds from the engine at this point.
Steam engines will use the voltage to time the exhaust chuff automatically. Operating in DCC. Finally press the stop button to exit out of programming. The three upper pictures represent the locomotive prior to the decoder installation. Remove the Phillips screw that is circled in red. There is a one Phillips screw that holds the tender's chassis and its shell together circled in red — remove the screw and gently lift the shell off of the tender's chassis.
The tender's shell and truck removed. Here is a picture of the original light board with DCC ready plug circled in red. Remove the DCC plug that came originally installed with the tender.
There is a capacitor across the motor circuit that drastically affects the speed curve when using a Quiet Drive decoder. It causes an over-speed problem. It must be removed from the circuit. Do this by simply cutting the capacitor leg out as shown in the picture above.
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