MTHTrains MTH SD-70 Operating Instructions Manual
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MTHTrains MTH SD-70 Operating Instructions Manual

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MTH SD-70 MAC DIESEL ENGINE
OPERATING INSTRUCTIONS
Thank you for purchasing the MTH Electric Trains SD-70 MAC diesel
locomotive. This ¼" scale reproduction of the famous SD-70 MAC
locomotive measures over 18" in length and weighs almost 6 pounds.
Despite its scale size, the locomotive is capable of operating on O-31 3-rail
track with any compatible AC transformer, (see page 34 for a complete list
of compatible transformers and wiring instructions) and is completely
compatible with most other 3-rail locomotives, rolling stock and
accessories.
The locomotive is equipped with several deluxe features that are simple
and fun to operate. Each feature is described among the following pages
which should be read before the engine is operated. For those of you who
can't wait to get started, the Quick Start Operating Instructions, found on
page 3, should be read so that you understand the basics of the operating
system. Those features marked for 2 and 3-rail engines are available in
both types of engines. Features not marked as such are only available in the
3-rail version.
E L E C T R I C
T R A I N S
R

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  • Page 1 E L E C T R I C T R A I N S MTH SD-70 MAC DIESEL ENGINE OPERATING INSTRUCTIONS Thank you for purchasing the MTH Electric Trains SD-70 MAC diesel locomotive. This ¼” scale reproduction of the famous SD-70 MAC locomotive measures over 18”...

  • Page 2: Table Of Contents

    OIL & LUBRICATION INSTRUCTIONS TRACTION TIRE REPLACEMENT INSTRUCTIONS LIGHT BULB REMOVAL & REPLACEMENT TROUBLE SHOOTING PROTOSOUND® PROBLEMS ProtoSound® RESET Feature Chart Transformer Wiring Chart SERVICE AND WARRANTY INFORMATION HOW TO GET SERVICE LIMITED ONE YEAR WARRANTY MTH SD-70 MAC Diesel Operating Manual...

  • Page 3: Quick Start - Basic Operation(All 3-Rail Models)

    QUICK START - BASIC OPERATION The MTH SD-70 MAC contains state-of-the art electronics with several built-in automatic features for incredibly realistic operation. Despite these advanced features, the SD-70 MAC is easy to operate with any compatible standard AC transformer (see the compatibility chart on page 34). All models are equipped with an operating smoke system that should be primed with smoke fluid before operating.

  • Page 4: Protosmoke™ Unit Operation

    If the wick is darkly discolored and hard, it should be replaced. Smoke Unit Frame Mounting Screws Figure 2: Inspecting The Smoke Unit MTH SD-70 MAC Diesel Operating Manual...

  • Page 5: Protosounds® Operating Instructions

    2.2 seconds during which you will hear the engine’s startup sounds begin. In order for ProtoSounds® to properly initiate the system check, do not advance the transformer throttle past 10 volts when you first MTH SD-70 MAC Diesel Operating Manual...

  • Page 6: Horn Operation

    The bell can be turned on or off with any separate bell button, like the Lionel® Railsounds® No. 5906 Bell Button, by simply pushing the button. If you don’t have a separate MTH SD-70 MAC Diesel Operating Manual...

  • Page 7: Protocoupler™ Operation

    Ca-Clunk Sound Cha-Chusshh Sound When the knuckle fires open you will hear the buzzing of the coil energizing and the sound of Press & Release Press & Release The Whistle Button The Whistle Button MTH SD-70 MAC Diesel Operating Manual...

  • Page 8: Cab Chatter Sounds

    Squeaking Brake Sounds High Voltage To Low button be used to “arm” the brake feature and is explained in more detail in the “Activating Freight Yard Sounds” section MTH SD-70 MAC Diesel Operating Manual...

  • Page 9: Tips On Using The Squeaking Brake Sounds

    Note: Consistent activation of the wheel flange squealing is determined by the condition of your transformer’s whistle button rectifier disc. Older rectifier discs may need to be replaced in order to play squealing sounds. MTH SD-70 MAC Diesel Operating Manual...

  • Page 10: Freight Yard Sounds (Fys)

    Forward, Neutral or Reverse). You will hear the bell chiming turn on Listen For The Press & Hold Air Release Sound and if you listen The Railsounds® Bell Button After 3 Seconds For 3 Seconds MTH SD-70 MAC Diesel Operating Manual...
  • Page 11 Neutral position. You cannot interrupt the power twice to enter another direction state and still have the brake feature active.) Once your engine begins moving, you can trigger the sounds to begin playing whenever you enter Neutral. MTH SD-70 MAC Diesel Operating Manual...
  • Page 12 3 seconds of leaving the Forward phase will disable FYS and shutdown ProtoSounds®. The next time you turn power back on your engine will be in the RESET position. See page 5 for more information on RESET. MTH SD-70 MAC Diesel Operating Manual...
  • Page 13 This is followed approximately two seconds later by a man whistling and continued freight yard Interrupt Throttle To loading and unloading sounds. Enter The Next Phase Listen For 2 Air Release Sounds MTH SD-70 MAC Diesel Operating Manual...

  • Page 14: Tips On Using Fys Features

    Forward phase will be rendered inactive by ProtoSounds® instead of the Reverse phase as explained in Event 3. This will allow your train to leave the yard in the same reverse direction that it arrived in. MTH SD-70 MAC Diesel Operating Manual...
  • Page 15 In Event 5, you cannot interrupt FYS until after the engine begins to move. Interrupting the throttle before the engine begins to move has no affect on the locomotive’s operation. MTH SD-70 MAC Diesel Operating Manual...

  • Page 16: Self-Recharging Battery Backup System

    OFF position to prevent harm to the smoke unit wicking). If you need to replace the battery, replacement ProtoSound® batteries are available from MTH ProtoSound® Electronics at 9693-A Gerwig Lane, Columbia, MD 21046. A standard 9v alkaline battery can be substituted as MTH SD-70 MAC Diesel Operating Manual...

  • Page 17: Protosound® Volume Adjustment

    RESET volume adjustment option, see the section entitled “Programming ProtoSound RESET Options” on the following pages. ProtoSound® Manual Volume Adjustment Figure 4: Adjusting The ProtoSound® Volume and selecting the ProtoCoupler ProtoCoupler™ Selector Switch MTH SD-70 MAC Diesel Operating Manual...

  • Page 18: Using "Reset" To Program Protosounds

    = 2 clinks)). “Clank + “Clink" + “Clink" = Feature 7. You can advance the throttle as quickly as you like (though you may not hear the air-release sounds) and the computer will still remember the number of MTH SD-70 MAC Diesel Operating Manual...

  • Page 19: Setting The Engine Volume

    Cab Chatter sounds will function normally. In fact because only the engine volume is affected by selections in Feature 6, when you select 0 volume, you can still hear the horn, bell and Cab Chatter sounds when the engine is running or in neutral. MTH SD-70 MAC Diesel Operating Manual...

  • Page 20: Programming For A Separate Bell Button Controller

    (3)they can be programmed to be turned off. The default setting is (2) Squeaking brakes are activated for full-time operation as described on page 8. To change the default setting, enter RESET and go to MTH SD-70 MAC Diesel Operating Manual...

  • Page 21: Programming For Horn In Neutral Operation

    ProtoSounds® to sound a bell ding(s). Continue pressing Interrupt The Throttle Listen For 5 Clank To “Lock-In” the whistle button until And 0 Clink Sounds The Horn Setting ProtoSounds® sounds two bell dings (signifying that MTH SD-70 MAC Diesel Operating Manual...

  • Page 22: Programming For Protocoupler™ Operation

    ProtoSounds® is equipped with a RESET setting to turn off the Freight Yard Proto-Effects (FYS) features. This is especially useful if you are double-heading engines that are both equipped with FYS. You may not MTH SD-70 MAC Diesel Operating Manual...

  • Page 23: Programming For Fys Operation

    Interrupt The Throttle until ProtoSounds® sounds Listen For 8 Clank To “Lock-In” And 0 Clink Sounds The Lock-Out Setting two bell dings signifying that the Remote Lockout Control has been selected. MTH SD-70 MAC Diesel Operating Manual...

  • Page 24: Programming For Cab Chatter Sounds

    To turn the Cab Chatter sounds back on again, repeat the above process, but keep pressing the transformer whistle button in Feature 23 until ProtoSounds® only sounds one bell ding. MTH SD-70 MAC Diesel Operating Manual...

  • Page 25: Reverse Unit Lock-Out Operation

    NEUTRAL AND WITH THE THROTTLE STILL ON, PRESS THE WHISTLE BUTTON. WHILE THE WHISTLE BUTTON IS BEING PRESSED, TURN OFF THE THROTTLE AND LET GO OF THE WHISTLE BUTTON. After about one second, you will hear a short blast MTH SD-70 MAC Diesel Operating Manual...
  • Page 26 While it doesn’t make any difference on how the lockout function operates, you may hear one of the three different NEUTRAL-activated sounds. To unlock the engine from the NEUTRAL position, follow the process to unlock the engine in the Forward or Reverse directions above. MTH SD-70 MAC Diesel Operating Manual...

  • Page 27: Oil & Lubrication Instructions

    (See Figure 7). Grease can then be applied into the gear box using a grease tube dispenser. Truck Block/Motor Mount Attachment Screw Figure 7: Lubricate The Tender Chassis Trucks MTH SD-70 MAC Diesel Operating Manual...

  • Page 28: Traction Tire Replacement Instructions

    If a twist occurs, the tire will have to be removed and reinstalled or a noticeable wobble in your engine will occur when operating the locomotive. In addition, it is important to make sure that the tire is MTH SD-70 MAC Diesel Operating Manual...

  • Page 29: Light Bulb Removal & Replacement

    Lubrication section on the proceeding pages. Once the cab has been separated from the chassis, gently unplug the bulb’s wire harness from the socket on the constant voltage circuit. Replacement bulbs are available directly from MTH Electric Trains. MTH SD-70 MAC Diesel Operating Manual...

  • Page 30: Trouble Shooting Protosound® Problems

    If you find that your problem can’t be resolved with this manual, contact MTH ProtoSound® Electronics (9693-A Gerwig Lane, Columbia, MD 21046, 410-381-2580) for additional assistance. HORN PROBLEMS REMEDY BELL PROBLEMS REMEDY MTH SD-70 MAC Diesel Operating Manual...
  • Page 31 COUPLER PROBLEMS REMEDY DIESEL START/CAB CHATTER REMEDY LOCKOUT PROBLEMS REMEDY VOLUME PROBLEMS REMEDY MTH SD-70 MAC Diesel Operating Manual...
  • Page 32 BATTERY PROBLEMS REMEDY RESET PROBLEMS REMEDY BRAKE SOUND PROBLEMS REMEDY MTH SD-70 MAC Diesel Operating Manual...

  • Page 33: Protosound Reset Feature Chart

    You can reset all features to their original factory settings by accessing Feature 18 in RESET and then pressing and holding the transformer whistle button until you hear a soft, warbled bell sound. RESET # OPERATION DEFAULT CLANKS/CLINKS MTH SD-70 MAC Diesel Operating Manual...

  • Page 34: Transformer Wiring Chart

    Center Rail Outside Rail Model Voltage Rating Type *ProtoSounds® needs over 14 volts of power to work properly. Overloading or using in-line accessories with this transformer may lower the peak voltage below ProtoSounds® minimum requirements. MTH SD-70 MAC Diesel Operating Manual...

  • Page 35: Service And Warranty Information

    MTH for your Return Authorization number. 3. Please make sure you have followed the instructions carefully before returning any merchandise for service. MTH SD-70 MAC Diesel Operating Manual...
  • Page 36 LIMITED ONE YEAR WARRANTY This item is warranted for one year from the date of purchase against defects in material or workmanship. We will repair or replace (at our option) the defective part without charge for parts or labor, if the item is returned to the address below within one year of the original date of purchase.

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