8
MTH SD70MAC Operating Instructions
firing the coupler at high speeds. Reduce the voltage setting on your
transformer if this occurs and run your engine at a slower speed before
firing the coupler. If the coupler continues to open erratically, try
lubricating the knuckle with
light oil as indicated in Fig. 3.
For multiple heading purposes,
only one of the two
ProtoCouplers™ will function at
any one time. Use the coupler
direction switch as shown in
Figure 4 on page 18 to select
either the front or rear coupler.
Simply slide the switch toward
the direction of the coupler you want to make active.
DIESEL CAB CHATTER SOUNDS
Whenever your diesel locomotive is parked in Neutral, randomly played
“Cab Chatter” sound effects will occur every 2 to 30 seconds. There are a
total of four of these Cab Chatter sequences that capture authentic radio
transmissions between dispatcher and engineer. They are designed to play
at random intervals to eliminate repetitive and boring sequences though
there is no guarantee that you won’t hear the same message repeated two or
more times.
SQUEAKING BRAKE SOUNDS
Proto-Sound® equipped engines feature the ability to play the sound of
squeaking brakes whenever your engine slows in speed. There are two
settings for activating the squeaking brake sounds. The default setting
allows the brake sounds to play while the engine is in forward or reverse
and the transformer throttle is lowered from a high setting to a low setting
(14 volts to 8 volts or less). The sound itself is a stored recording on the
Proto-Sound® software chip and will always play the same brake sound for
the same three second length
each time the voltage is reduced
from high to low. Some practice
may be required to synchronize
the playing of the brake sounds
with the movement of the
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