MRC 0001657 Quick Start Manual Download Page 1

 HO Gauge Synchronized

Diesel Sound Decoder with

28 Accessory Functions

Item #0001657

Thank you for purchasing our highly advanced DCC locomotive
sound decoder. Combined with any DCC System, our new
decoder with “Camegie Hall” sound quality will make your model
railroad come to life.

Synchronized diesel prime mover with randomly associated

locomotive sounds

1.5 amp capacity

Programmable choice of 2 different horns and 2 bells

Programmable individual sound volumes

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 for either ditch lights, mars light, gyra

light andprime strobe light

28 accessory functions (F1-F28)

Supports advanced consisting (CV19)

Supports programming on the main (OPS mode)

Compatible with NMRA DCC standards

NMRA 8 pin plug included for easy installation

Complies with Part 15 of FCC

 2

0

mm speaker with baffle included (other size, aftermar-

ket speakers are available from MRC)

Dimensions: 46.0mm x 17.5mm x 5.0mm

The decoder can be upgraded to all the horns included

in the Demo F19, and more choices of bells.

PROGRAMMING

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

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.

 2007 MODEL RECTIFIER CORPORATION

80 NEWFIELD AVENUE

EDISON, NJ 08837-3817

Printed in USA

LIGHT EFFECTS WIRING

Your MRC Synchronized Diesel Sound Decoder is equipped with normal
directional lighting, plus MRC light effects. If your loco has ditch lights, mars light
or strobe light, you can solder wires to the four solder tabs (2 pairs marked with
ACC1,ACC2) on the bottom of the decoder. The two center solder tabs are the
common for the accessory light effects.

All the decoder’s light outputs are track output voltage (around
14V) supplied by your DCC system. They are designed for 12V
light bulb. Please contact your loco manufacturer for lights’
operation voltage. If you have a 1.5V bulb use 1k ohm resistor or
LED, you should connect a 2k ohm resistor in series to one of the
leads to limit current.

TROUBLE SHOOTING

The MRC 0001657 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.
This is not a defect of the decoder or your DCC. 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 interfer-
ence 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 $

1

5

.00 check to cover shipping and

handling. 

Be certain to return only the decoder.

Warranty does not include abuse, neglect, or using this product for
anything other than it’s intended purpose. Warranty coverage will be
handled on a case by case basis, and other charges may apply for
repair/replacement of the product.

Send the decoder to:

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

CV

Register

Description

Range

Default

CV1

R1

Short address

1-127

3

CV2

R2

Start voltage

0-32

0

CV3

R3

Acceleration

0-32

0

CV4

R4

Deceleration

0-32

0

CV5

---

Top voltage

0-32

32

---

R6

Page number

---

---

CV29

R5

Basic configuration

---

2

CV7

R7

Manufacturer version number

---

32

CV8

R8

Manufacturer ID

---

143

CV17

---

Long address upper byte

192-231

192

CV18

---

Long address low er byte

0-255

3

CV19

---

Advanced consist address

0-127

0

CV49

Sound on/off (0=on)

0-1

0

CV50

---

Horn type

0-1

0

CV51

---

Horn volume

0-3

0

CV52

---

Bell type

0-1

2

CV53

---

Bell volume

0-3

3

CV54

---

Bell ring rate

0-50

3

CV55

---

Diesel rumble volume

0-3

3

CV56

---

Brake squeal volume

0-3

3

CV57

---

Dynamic brake volume

0-3

3

CV58

---

Air release volume

0-3

3

CV59

---

Air pump volume

0-3

3

CV60

---

Safety pop valve volume

0-3

3

CV61

---

Engine cooling fan volume

0-3

3

CV62

---

Coupling volume

0-3

3

CV63

---

Random noise volume

0-3

3

CV64

---

Rail w heel clack

0-3

3

CV105

---

User identification number

0-255

0

CV106

---

User identification number

0-255

0

CV112

---

Exhaust volume

0-3

3

CV113

---

Coupling fire volume

0-3

3

CV114

---

Light brightness (green, brow n)

0-12

3

CV115

---

Auto brake squeal enable/disable

0-1

1(enable)

CV116

---

Coupling sound type

0-2, 2=off

1

CV117

---

Lights enable/disable

0-1

1(enable)

CV118

---

Accessory light #1configuration

0-6

0

CV119

Accessory light #2configuration

0-6

0

CV120

Brake release volume

0-3

3

CV122

Diesel sound type (0=off, 1=rpm & notch synchro 

to speed, 2=linear rpm synchro to speed, 3=notch 

up/dow n (F8=notch dow n, F9=notch up))

0-3

1

CV124

Speed curve select (0=linear, 1=slow  increase at 

slow  speed, 2=fast increase at slow  speed

0-2

0

CV125

---

Factory default setting: Programming to 1 w ill 

restore all CV's to default setting

---

0

CV21

---

0

When CV21=0, all accessory functions w ill follow  

its ow n address. When CV21=1, all functions w ill 

follow  the consist address

---

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