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Bachmann 2-8-0Tsunami Digital Sound Decoder Installation
Notes
OverviewThis application note describes how to install a
TSU-1000 digital sound decoder into an HO Bachmann 2-8-0.
Skill Level 2: The entire installation can be completed in one
to two hours with no modification required to the model.
Bill of MaterialsP.N. Description
826104 TSU-1000 for K-Class810054 28mm (1”) dia. Speaker810119
28mm (1”) dia. Speaker Gasket Kit
Tools You Will Need■ 25W Soldering Iron■ Rosin Core Solder■
Electronics Solder Flux■ Wire Strippers■ Wire Cutters■ Hobby Knife■
Miniature Screwdriver Set■ Toothpick■ Small Pliers■ Double-sided
Tape
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Installation
1. Disconnect the locomotive from the tender by carefully
separating the two plugs that connect them together. Set the
locomotive aside. (Photo 1)
2. Remove the screw located under the front truck and gently
lift off the shell. Note: there are two tabs on the back of the
shell that help secure it in place. (Photos 2 and 3)
3. Unplug and discard the DCC mobile decoder to expose the NMRA
8-pin plug. (Photo 4)
4. Unscrew the two screws from the factory PCB to access the
area for the speaker. (Photos 5 and 6)
5. Attach the 28mm gasket to the 28mm speaker by peeling off one
side of the backing. Be careful not to get it on the cone.
6. Peel off the backing on the other side of the gasket and
press the speaker into the baffl e. Note: make sure the solder pads
for the wire are facing toward the rear of the tender. (Photo
7)
7. Reinstall the factory PCB over the speaker.
8. Measure and cut the Tsunami wires to approximately 3” in
length. (Photo 8)
9. Cut the speaker wires to approximately 5” long.
10. Strip 1/8” of insulation off the ends of each wire and tin
the ends for easy installation.
11. Using a toothpick, place a small amount of solder fl ux into
each of the 8 pins in the NMRA 8-pin plug.
Photo 1
Photo 2 Photo 3
Photo 4
Photo 5 Photo 6
Photo 7
Photo 8
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15. Attach one 1” piece and one 1/2” piece of double-sided tape
to the tender shell to mount the decoder and capacitor. (Photo
11)
16. Attach the decoder and capacitor to the double-sided tape.
Note: the brown, green, and off-white wires are not used. These can
either be cut off or secured with tape to prevent issues later.
(Photo 12)
17. Place the tender on track to test the installation. If all
is well, the red light should appear on the decoder and sound
should be controllable on Address 3.
18. Reattach the tender shell and screw the tender back to body
to complete the install. Then plug the tender and locomotive back
together.
Let the fun begin!
12. Begin soldering the wires directly to the NMRA plug. Start
with the orange wire in the upper right-hand corner (engineer side)
and push the end of the wire into the corresponding hole. (Photo
9)
13. Working right to left, complete wiring the wires to the NMRA
8-pin plug. See Figure 1 for the pin arrangement (orange = Pin 1).
(Figure 1)
14. Solder the speaker wires to the speaker solder tabs. Note:
because we are using only one speaker, polarity doesn’t matter.
(Photo 10)
Photo 9
Figure 1
Photo 10
Photo 11
Photo 12
TM
New Dimensions in Digital Sound Technology
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