MRC 0001634 Quick Start Manual Download Page 1

HO Gauge EMD Modern Large

Snap-in Diesel Sound Decoder with

17 Accessory Sound Functions

Item #0001634

Thank you for purchasing our highly advanced DCC locomo-
tive sound decoder. Combined with any DCC System, our
new decoder with authentic diesel sound truly will make your
model railroad come to life.

Replaces most locomotive circuit boards

Synchronized diesel prime mover with randomly

associated locomotive sounds

17 accessory functions allowing more sound control

than ever

Programmable individual sound volumes

1.5 amp capacity

Programmable for either 2-digit (1-127) or 4-digit

(1-9999) addresses

Programmable start voltage

Programmable acceleration rate

Programmable deceleration rate

Programmable top voltage

Programmable 14, 28, 128 speed steps

Selectable factory default speed curve

Directional lighting (FO) at 0.2 amp rate

Programmable “Rule 17” directional lighting

Programmable for either ditch lights, mars light, or

strobe light

Supports advanced consisting (CV19)

Supports programming on the main (OPS mode)

Compatible with NMRA DCC standards

Complies with Part 15 of FCC

28mm speaker included

Dimensions: 75.0mm x 17.5mm x 7.5mm

LIGHT EFFECT PROGRAMMING CHART FOR CV#112

Your MRC Synchronized Diesel Sound Decoder is equipped with normal directional
lighting, plus MRC light effects. (see connect lights diagram) you can choose from
ditch lights, mars light or strobe light.  Your diesel loco can also have “Rule 17”
directional headlights, through simple programming, without any complicated
wiring.

UPGRADE

This decoder can be upgraded to MRC top line decoder performance that has 8
different bell sounds and 15 different horns. if you wish to upgrade your decoder
please send in the decoder with $24.00 check.

TROUBLE SHOOTING

The MRC 0001634 HO diesel sound decoder should perform well with all DCC
systems. See your DCC system manual to learn how to program and operate the
decoder. For more information about register/CVs and their functions, please refer
to the NMRA DCC Standard & Recommended practices, RP-9.2.2 this is available
directly from the NMRA or their website at 

www.nmra.org.

Due to the nature of all sound decoders, the CV read back is not 100% correct. So
this feature is not supported in the decoder. This is not a defect of the decoder or
your DCC system.

Whenever the decoder doesn’t work please use program track to re-program the
loco address or program CV# 125 with value 1 to restore the decoder to factory
setting. This should bring the decoder to life.

FCC COMPLIANCE

This device complies with the part 15 of FCC rule. Operation is subject to the
following two conditions. (1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including interference that
cause undesired operation.

RETURN PROCEDURE

If it should become necessary to return your decoder, unplug the decoder and
return the decoder only. Please include a letter (printed clearly) with your name,
address, a daytime telephone number, and a detailed description of the problem
you are experiencing. Please also include a $15.00 check for shipping and
handling. 

Be certain to return only the decoder.

Send the decoder to:

Model Rectifier Corporation
Attn: Parts & Service
80 Newfield Avenue
Edison, NJ 08837-3817 U.S.A

PROGRAMMING

This decoder supports all programming methods including: register, paged CV,
direct CV, and programming on the main (ops mode programming).

 2005 MODEL RECTIFIER CORPORATION

80 NEWFIELD AVENUE

EDISON, NJ 08837-3817

NOTE: 

Due to limitations in older DCC systems, some of the sound functions or

light effects functions may not accessable. ALSO, you might be limited to
factory default CV values.

Printed in USA

Light

CV

Effect

value

CV#112

Normal on/off

Normal on/off

Ditch light

Ditch light

0

CV#112

Normal on/off

Normal on/off

Mars light

Single strobe light

1

CV#112

Normal on/off

Normal on/off

Mars light

Double strobe light

2

CV#112

Rule 17

Rule 17

Ditch light

Ditch light

16

CV#112

Rule 17

Rule 17

Mars light

Single strobe light

17

CV#112

Rule 17

Rule 17

Mars light

Double strobe light

18

Acc2 light

Acc1 light

Head Light

Head Light

CV

Register

Description

Range

Default

CV1

R1

Short addres s

1-127

3

CV2

R2

Start voltage

0-32

0

CV3

R3

Acceleration

0-32

0

CV4

R4

D eceleration

0-32

0

CV5

---

Top voltage

0-32

32

---

R6

Page num ber

---

---

CV29

R5

Bas ic configuration

---

2

CV7

R7

Manufacturer vers ion num ber

---

32

CV8

R8

Manufacturer ID

---

143

CV17

---

Long addres s  upper byte

192-231

192

CV18

---

Long addres s  low er byte

0-255

3

CV19

---

Advanced cons is t addres s

0-127

0

CV49

Sound on/off (1=on)

0-1

1

CV51

---

H orn volum e

0-3

3

CV53

---

Bell volum e

0-3

3

CV54

---

Bell ring rate

0-50

3

CV55

---

D ies el rum ble volum e

0-3

3

CV56

---

Brake s queal volum e

0-3

3

CV57

---

Dynam ic brake volum e

0-3

3

CV58

---

Air releas e volum e

0-3

3

CV59

---

Air pum p volum e

0-3

3

CV60

---

Safety pop valve volum e

0-3

3

CV61

---

Engine cooling fan volum e

0-3

3

CV62

---

Coupling volum e

0-3

3

CV63

---

Random  nois e volum e

0-3

3

CV64

---

R ail wheel clack

0-3

3

C V105

---

Us er identification num ber

0-255

0

C V106

---

Us er identification num ber

0-255

0

C V112

---

Light effects

s ee chart

0

C V113

---

Ditch light rate

0--20

3

C V114

---

Light brightnes s  (green, brown)

0-12

3

C V115

---

Auto brake s queal enable/dis able

0-1

1(enable)

C V116

---

Coupling s ound type

0-2, 2=off

1

C V117

---

Lights  enable/dis able

0-1

1(enable)

C V119

Coupling fire volum e

0-3

3

C V120

Brake releas e volum e

0-3

3

C V121

random  nois e enable

0-1

1(enable)

C V122

D ies el s ound type (0=off, 1=rpm  & 

notch s ynchro to s peed, 2=linear rpm  

s ynchro to s peed, 3=notch up/down 

(F8=notch dow n, F9=notch up))

0-3

1

C V124

Speed curve s elect (0=linear, 1=s low 

increas e at s low s peed, 2=fas t 

increas e at s low s peed

0-2

0

C V125

---

Factory def ault setting: Programming to 1 

will

 

 

restore all  CV 's to def ault setting 

--- 0

CV21 -- 0

When CV 21=0, all accessory f unctions 

w

ill 

f ollow  its  ow n address. When CV 21=1, all 

f unctions 

wi

ll f ollow  the cons is t addres s

---

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