©2011 Digitrax, Inc.
www.digitrax.com
2
Parts List
1 SDN144A0 light board replacement Decoder with Sound FX™
1 Factory wired 18mm x 10mm 8 Ohm speaker.
1 Factory wired 100 uF/25V capacitor , 1 Instruction sheet
Installation Information
See the Digitrax Decoder Manual for complete decoder test procedures, instal-
lation instructions, programming and technical information. Digitrax manuals
and instructions are updated periodically. Please visit www.digitrax.com for the
latest versions, technical updates and additional locomotive-specific installation
instructions. Machining or modification of frames or shell parts require some
skill and patience, as they are easily damaged. After market pre-machined
frames may be available for some locomotives.
1
. Carefully remove the Atlas GP38 shell parts. Remove the factory analog
light PCB, trucks, drive shafts, motor and all parts and carefully save these in
the correct order for re-installation.
2
. Place the decoder in position on one frame half and route the motor tabs
through the PCB slots, as shown in
Figure 1.
Reassemble the mechanism
making sure that the track pickup springs are not bent from position, which
may cause poor pickup. If the decoder power tabs in the frames are a loose
fit due to tolerances, it is useful to place some kapton tape under the
decoder (in front of motor tabs) to make the fit more snug.
3
. The rear light and number boards part shown removed in
Figure 2
will need
Complete Train Control
Run Your Trains, Not Your Track!
Figure 1:
SDN144A0 installation in Atlas N-GP38
track pickup springs
N scale GP38 shell
SDN144A0
motor tabs in PCB slots
18 x 10 mm
Factory speaker
Atlas GP38 frames
Factory wired 100uF capacitor
decoder power tabs
BLMA rear fan details
kapton tape across
frame, under capacitor
kapton tape across
frame, under speaker
