5
RailKing SD-90 MAC Operating Manual
approximately 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
enter RESET, wait for the diesel startup sounds to begin and then slowly
turn the transformer throttle to the off position and then back on again to
enter the forward phase. Interrupting the power too quickly may cause the
system to re-enter RESET (signaled by two dings of the bell). Should this
happen, wait longer before interrupting the power to enter the Forward
phase.
ProtoSounds® comes with several programmable functions, including
Engine Volume Adjustment, Separate Bell Button Operation (pre-
programmed at the factory), Cab Chatter On/Off Control, ProtoCoupler
On/Off Control and Horn-In-Neutral Operation. Each of these features are
described in more detail later. You will notice that when in RESET, your
engine will not respond to the whistle button with a horn blast or continuous
bell ringing. In fact, when in RESET and the whistle button is depressed,
only one single bell chime will be heard each time the whistle button is
pressed. If you don’t want to configure or change your locomotive using
any of these programmable features, simply leave RESET and wait 2.2
seconds before interrupting the power to put the engine in forward. After
you leave RESET, your engine will operate normally in all the direction
states of forward, neutral and reverse.
HORN OPERATION
Your RailKing SD-90 MAC ProtoSound® equipped engine is equipped
with a digital recording of a diesel horn. The horn sound can be activated
anytime the engine is in forward or reverse by pressing the whistle button
on your transformer. The horn will continue to blow as long as the whistle
button is depressed. The horn will not function in RESET and must be
configured through a RESET option to allow the horn to work when the
engine is in neutral. See page 17 for information on horn programming in
the Using RESET To Program ProtoSounds® section of this manual.
BELL OPERATION
Your RailKing SD-90 MAC ProtoSound® equipped engine is equipped
with a digital recording of an actual diesel bell. Unlike previous versions of
ProtoSounds®, the bell can be turned on or off with any separate bell
button, like the Lionel® Railsounds® No. 5906 Bell Button, by simply
