3
MTH GP38-2 Operating Instructions
QUICK START - BASIC OPERATION
The MTH GP38-2 contains state-of-the art electronics with several built-in
automatic features for incredibly realistic operation. Despite these advanced
features, the GP38-2 is easy to operate with any compatible standard AC
transformer (see the compatibility chart on page 31).
The GP38-2 model is controlled by a ProtoSound® 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 1) state and is explained in more detail
beginning on Page 5. The ProtoSound® 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.
RESET
Neutral
Reverse
Neutral
Forward
Figure 1: ProtoSound® DCRU® Cycle Phases
