Digitrax DH165K1A User manual

©2009 Digitrax, Inc www.digitrax.com 1
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DH165K1A
Board Replacement Decoder Fits
Kato SD40-2, AC4400 Locos
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Fe ea at tu ur re es s: :
nAccepts Plug-in SFX SoundBugTM sound modules
nOnboard White LEDs for Headlights and Ditch lights.
nDigitrax LocoMotion®System-Your locomotives look like the real thing.
The Digitrax LocoMotion System makes them run like the real thing, too!
Torque Compensation for smooth as silk silent operation.
128 Speed Step operation (14 or 28 steps can also be used).
Momentum with acceleration and deceleration.
Normal Direction of Travel is user selectable.
Switching Speed feature for easier and faster access to yard speeds.
3 Step Speed Tables set start, mid and max voltage for custom control.
28 Step Speed Tables with 256 level resolution for precise control.
nScalable Speed Stabilization with simple setup & 1024 level resolution.
nSuperSonic motor drive for silent operation.
nFX3Functions for prototypical lighting effects:
Constant Brightness Lighting directional or independent control.
Realistic Effects like Ditch lights, Mars lights, strobes, and many more.
Dynamic and Static Qualifiers operate functions based on direction,
F0 on or off, loco direction and F0, and whether loco is moving.
Function Remapping for custom function setup.
Master Light Switch turns off all lights & functions with one keystroke.
Advanced Consist Function Controls
nPlug ‘N Play design makes installation quick and easy.
nTransponder equipped ready for transponding on your layout.
Compatible with digital surround sound systems
nAll Mode Programming with Operations Mode Read Back-read back CV
values right on the mainline.
nDecoder Factory CV Reset with or without speed table initialize.
nMotor Isolation Detection prevents damage to your decoder.
nBasic, Advanced & UniVersal Consisting
n2 Digit and 4 Digit Addressing
nDCC Compatible
HO Scale
Mobile Decoder
Plug ‘N Play
SFX SoundBugTM compatible
1.25 Amp/2 Amp Peak
6 FX3 Functions, 0.5 Amp

©2009 Digitrax, Inc www.digitrax.com 2
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1 DH165K1A Decoder 1 Instruction sheet
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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.
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1. Carefully remove the locomotive’s
shell from the frame. Note the or
intation for proper reinstallation.
(Figure 1)
2. Remove the four track power pick-
up wires clipped to the lightboard-
at mid point (Figure 1)
3. Unscrew the two screws securing
the lightboard and lift it from the
frame. (Figure 2)
4. Remove the lightboard by pullin-
git gently straight up, off the
motor clips. (Figure 3)
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Figure 1. Remove shell
Figure 2. Lightboard Removal
Figure 3. Lightboard removal
Motor clips
Track Power
Pickups
Lightboard
screws

©2009 Digitrax, Inc www.digitrax.com 3
5. Decoder installation is the
reverse of what we’ve done so
far. Snap the decoder into place
over the motor clips. Be sure
motor clips are spread enough
to engage snugly in decoder-
holes. Secure the decoder with
screws. (Figure 4) Re-attach
Track Power Pickup wires
(Figure 5) and check Light Pipe
alignment (Figure 6) .
5. Replace the locomotive shell.
6. Digitrax decoders are set up with configuration variable (CV) factory set-
tings so you can run your locomotive using address 03. This installation
will allow the loco to run short hood forward. To setup ditch lights to oper-
ate on F2/Horn key, program CV51=106 and CV52=107
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All Digitrax decoders can be customized for realistic operation. The most com-
monly used CVs, their default values and uses are listed below. The Digitrax
Decoder Manual, available on line at www.digitrax.com, contains complete
information on these and other CVs and CV values available.
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The first CV most people change is the decoder address so that the loco can be
independently controlled with it’s own unique address. All Digitrax decoders
are shipped with CV01 (AD2), the two digit address, set to 03. See your Starter
Set Manual for complete programming instructions. Following is a brief
description of how to change the decoder address with a DT series throttles.
1. Place the loco on the programming track. Go into Program Mode on your
system. On DT400 press PROG. On DT300, DT100 & DT200 press
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Figure 4. Install Decoder
Motor clips must
fit snugly
Figure 5. Install Decoder Figure 6. Install Decoder
Attach track power
pickup wires to the
decoder
Spread Motor clip
pins if necessary.
Motor Clip pins must
fit snugly into decoder
PCB!
Track Pickup wires
must fully engage
clips. Insulation
should meet clip, but
not be underneath it.

©2009 Digitrax, Inc www.digitrax.com 4
RUN/STOP & FN/F0.
2. Choose AD2 for 2 digit addressing or AD4 for 4 digit addressing (DT300 &
DT400). (Ad for DT100 & DT200, see set manual for 4 digit instructions).
3. Choose the address you want to set up for the decoder.
4. Complete address programming. On DT400 press ENTER. On DT300,
DT100 & DT200 press SEL.
Note: CV29 must also be programmed to enable 4 digit addressing, this is
done automatically by the DT300 & DT400 but not on earlier throttles.
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Your locomotives look like the real thing, now you can make them run like the
real thing, too. Digitrax decoders incorporate torque compensation for smooth
as silk operation. You can also program CVs that control momentum, 3 step
and 128 step speed tables, switching speed, normal direction of travel,
scaleable speed stabilization and more to take full advantage of the Digitrax
LocoMotion System.
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Acceleration is controlled by CV03 and deceleration by CV04. Both come
from the factory set to 000/x00. A range of 000/x00/ to 031/x1F is available for
both accel and decel. We recommend that you try CV03:003/x03 and
CV04:000/x00 as a starting point for experimenting with momentum.
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There are two types of speed tables: 3 Step Tables and High Resolution 28 Step
Tables. Please see your Decoder Manual for a discussion of the 28 Step Tables.
The 3 Step Tables are set up by programming 3 CVs: Start Voltage (CV02),
Mid point Voltage (CV06) and Max Voltage (CV05). These values are set at
000/x00 at the factory. All have a range of values from 000/x00 to 255/xFF. We
recommend the following CV values as a starting point for experimenting with
speed tables.
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©2009 Digitrax, Inc www.digitrax.com 5
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Switching speed is controlled by CV54. The factory setting is 000/x00 for
OFF. To turn on the switching speed feature, program CV54 to a value of
001/x01. When this feature is on, use F6 to activate and deactivate switching
speed. When switching speed is ON and F6 is ON, the switching speed feature
is on. With the feature on the throttle’s target speed is effectively reduced by
about 50% and the effects of accel and decel programmed into the decoder are
reduced by 1/4. This is useful for yard switching operations.
Normal Direction of Travel is controlled by CV29 bit 0.
The intensity of Scaleable Speed Stabilization (Back EMF) is controlled by
CV57. The default value for this feature is 006/x06 which is suitable for most
locos. You can adjust this value in the range of 000/x00 for OFF to 015/x0F for
the maximum effect. Consult your Decoder Manual for info about CVs 55 &
56 and their effects on scaleable speed stabilization.
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The factory settings in the decoder provide silent, smooth operation of your
locomotive under most conditions. For more information about these settings,
please see the Digitrax Decoder Manual or our web site.
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Digitrax Transponding is controlled by CV61. The initial factory set value is
000/x00 for OFF. To turn ON transponding, program CV61 to a value of
002/x02. This allows you to use Digitrax transponding to keep track of your
rolling stock. When transponding is enabled, the front light of the locomotive
will flicker slightly to indicate transponding signal is being communicated. For
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Loco Type V Start V Mid V Max
CV02 CV06 CV05
Switcher
Concentrated low speed. Limited top 002/x02 038/x26 064/x50
speed
Road Switcher
Prototypical top speed w/evenly 002/x02 048/x30 098/x62
distributed curve from 0 to top speed
Mainline Loco
Quick increase to cruising speed then 002/x02 128/x80 154/x9A
levels off to prototypical top speed.

©2009 Digitrax, Inc www.digitrax.com 6
optimal transponding operation, we recommend that you hook up the forward
and rear lights using the standard installation instructions.
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De ec co od de er rR Re es se et tC CV V0 08 8
Decoder reset lets you reset all CV values to the initial factory settings. To
reset all CV values, program CV08 to a value of 008/x08. You also have the
option of resetting all values except the 28 speed step tables. To do this,
program CV08 to a value of 009/x09.
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The DH165K1 is set up at the factory to control six function outputs, with-
white factory LEDs on the; F0F-forward/white lead, F0R-reverse/Yellow
lead (for directional lighting), F1/Green lead and F2/Violet leads (for Ditch
lights).
Functions F3 (Brown) and F4 (White/Yellow) can be used by soldering a
wire from the pad for the function you wish to use to the lamp (or other
function) you wish to control. The wire colors indicated are the standard
color code used in the industry (you can use any color you like). These col-
ors are important if you plan to use function remapping. CAUTION: When
adding function wires, be very careful that the wires you add do not come
into contact with any other pads or components on the board where they
might create a short circuit.
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Motor connections Soundbug goes
underneath PCB
F4+ (680 ohms)
Blue/+common
Rear
Front
F0F F1,Green
F2, Violet
F3, Brown
F4, Wht/yellow
Figure 5. DH165K1A Decoder Function Outputs (front of loco to the right)
Track Power
F0F+
F3+ (680 ohms)

©2009 Digitrax, Inc www.digitrax.com 7
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Function remapping allows you to program the function outputs of your decoder
to be controlled by selected function keys on your throttle. Please consult the
Digitrax Decoder Manual or web site for information on function remapping.
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Digitrax Transponding is controlled by CV61. The default value is 000/x00
for OFF. To turn on transponding, program CV61 to a value of 002/x02. This
allows you to use Digitrax transponding to keep track of your rolling stock.
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Decoder reset lets you reset all CV values to the factory settings. To reset all
CV values, program CV08 to a value of 008/x08. You also have the option of
resetting all values except the 28 speed step tables. To do this, program CV08
to a value of 009/x09.
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All warranties on Digitrax products are limited to refund of purchase price,
repair or replacement at Digitrax’s sole discretion. Except as expressly stated in
the full warranty statement, there are no warranties, express or implied, includ-
ing but not limited to any warranties of merchantability or fitness for a particu-
lar purpose. For complete warranty details see www.digitrax.com.
Damaged decoders should be returned directly to Digitrax for repair.
Digitrax, Inc. is not responsible for unintentional
errors or omissions in this document.
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Made in U.S.A.
307-DH165K1A-INS 1K/01/09
2443 Transmitter Rd
Panama City, Fl 32404
Tel [phone]
Fax [phone]
E[email protected]
DH165K1A
Board Replacement Decoder Fits Kato SD40-2,
AC4400 H0 Scale Locomotives