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MTH SD70MAC Operating Instructions
QUICK START - BASIC OPERATION
The MTH SD70MAC contains state-of-the art electronics with several
built-in automatic features for incredibly realistic operation. Despite these
advanced features, the SD70MAC is easy to operate with any compatible
standard AC transformer (see the compatibility chart on page 32). All
models are equipped with an operating smoke system that should be primed
with smoke fluid before operating. Adding 20 - 25 drops of fluid through
the smoke stack should be sufficient. If you choose to not prime the units
with fluid, turn the smoke unit switch located under the trailing truck to
the OFF position. (See Figure 1) This will prevent any damage from
occurring to the smoke unit when running the engine without a primed
smoke unit. For more information see the section on page 4 on Smoke Unit
operation.
The SD70MAC model is controlled by
a Proto-Sound® DCRU® electronic
reverse unit. The reverse unit operates
in the same manner that all reverse units
function by using forward, neutral and
reverse states that are entered each time
the throttle is turned on and off or by
using the transformer direction switch (if
so equipped).
The reverse unit is designed to ignore
dirty track, dead spots on switches or minor short circuits without disrupting
the engine operation, even at slow, prototypical speeds. Once the engine is
placed on the track, the transformer throttle can be advanced. You will see
that only the engine’s lights come on and two dings from the sound system
will chime followed by the air compressor pump sounds. The engine does
not run. This is known as the RESET (see figure 2) state and is explained in
more detail beginning on Page 5. The Proto-Sound® DCRU® will not
power the motor until the throttle is turned OFF and then ON again. At this
point, the engine will now function just like any other electronic or
mechanical E-unit.
Smoke Unit Switch
Figure 1: Locating the Smoke Unit Switches on
each A Unit
RESET
Neutral
Reverse
Neutral
Forward
Figure 2: ProtoSound® DCRU® Cycle Phases
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