Digitrax SoundFX SDH166D Manual page 3

2. On the 9 Pin Track and Function harness connect the function leads that are
to be used for e.g. lights. Insulate any unused function leads so they cannot
short to the locomotive frame or track power.
3. Mount the factory 8 ohm 16 x 26 x 9mm box speaker attached to the 10 Pin
Sound Harness in a suitable location (refer to Figure 2). Be sure to inspect
the speaker diaphragm for magnetic debris or damage, which will affect
sound quality. Other speaker(s) may be substituted in combinations as long
as the total impedance between Pin 3 and Pin 8 of the 10 Pin Sound Harness
is 8 ohms or greater.
Depending on the locomotive model and construction it may be necessary to
modify the frame or parts of the internal shell to make room for one or more
speakers and enclosures.
Figure 2: SDH166D:
SDH166D decoder
on double sided
tape on top of
light board
4. Mount the 330uF electrolytic energy storage capacitor from the 10 Pin Sound
Harness. Be sure not to short the capacitor case or leads to the track leads or
locomotive frame or damage to the decoder may result.
5. For Steam units using external synchronization cam capability, connect the
White CAM wire of the 10 Pin sound harness to the output connection of
your cam, and configure CV133 to a value of 128 to make the steam chuff to
be synchronized with the external cam.
6. Inspect the installation before testing the sounds and replacing the shell. In
particular be sure that wires are correctly soldered and routed and that the
motor and capacitor leads are not shorted to the frame or track.
7. Place the loco on an active DCC track powered by a compatible DCC system
and select the factory default address 03 to enable sounds for testing.
8. Be sure F8 (mute) is OFF to allow sound output, and then press
F1 (bell) or F2 (whistle/horn) ON to hear the associated sounds.
9. Customize sounds by programming Sound CVs to adjust the desired config-
urations, as shown in the following tables of SoundFX CVs. Sound schemes
other than the factory preloaded default Steam (CV60=0) or Diesel (CV60=1)
schemes can be loaded by using a Digitrax PR3 SoundFX Programmer.
© 2013 Digitrax, Inc.
Install example in Athearn SD-70MAC with 9-Pin plug
Decoder wires -
formed to avoid
moving parts
— 3 —
Speaker
Installed
www.digitrax.com
330uF
Energy
storage
capacitor