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The Spektrum AR6400 installed on your P-51D Mustang is a lightweight
combination of main motor electronic speed control, servos and Spektrum
DSM2 compatible receiver. The receiver unit is also equipped with a status
indicator LED. Please refer to the instruction manual of the AR6400 for more
information on the unique features and programming options.
he following checklist contains the steps you must follow to ensure proper
arming and operation of the receiver unit, as well as proper motor response:
• Each time before you fly you should ALWAYS turn the transmitter on
before connecting the flight battery to the receiver unit. Never connect
the flight battery to the receiver unit before powering the transmitter on
first. After each flight, be sure that you always disconnect the flight
bat tery from the receiver unit before powering the transmitter off.
Note: The only time you should connect the flight battery to the receiver
unit before powering the transmitter on is when you are binding
the receiver of the receiver unit to the transmitter. Please see the
Transmitter and Receiver Binding section of this manual for more
information.
• The throttle stick MUST be set in the lowest possible position, and,
for most transmitters, the throttle trim must also be set to the lowest
possible position in order for the receiver unit to arm. If this is the first
test flight, or a test flight following repairs, you should also center the
rudder, aileron and elevator trims.
• When the status LED on the AR6400 becomes solid red, the receiver
unit is initialized and ready for flight. Also, as long as you had the
throttle stick in the idle position and the throttle trim in the lowest
position during the initialization process, the ESC/motor will now
be armed. Use caution as the propeller will now spin with throttle
stick input.
Note: If the status LED of the AR6400 does not become solid red, please
review the following:
• If after blinking red the status LED becomes solid red, but you have
no control of the motor, you have a positive Radio Frequency (RF) link
between the transmitter and receiver, but the throttle stick and throttle
trim may not be set to the correct positions. Check to be sure that the
throttle stick is in the lowest possible position, and that the throttle trim
is set to the middle or a lower-than-the-middle position. If you now have
control of the motor, proceed to the next step of the checklist.
• If the blinking red status LED keeps flashing, you do not have a
positive RF link between the transmitter and receiver. Check to be
sure that the transmitter has been powered on and that the LED
indicator on the transmitter is glowing solid red. If the transmitter is
powered on and functioning properly, disconnect the flight battery from
the receiver unit, then reconnect it. Now the receiver unit should
initialize and arm properly.
Note: In the event you inadvertently enter Bind Mode, the LED on the
AR6400 will be flashing red continuously. If this occurs, cycle the
flight battery while the transmitter is on (if previously bound). If your
receiver unit will not initialize and arm after following the guidelines
as listed above, call the Horizon Support Team at 1-877-504-0233.
•Once you have placed the airplane in a safe area, free of obstructions,
and are clear of the propeller, you can safely begin to power up the
model to check for proper operation of the motor.
• Advance the throttle stick upward slowly, just until the propeller begins
to spin.
DO NOT attempt to fly the airplane at this time.
Note the
direction the propeller spins. If viewed from the front of the airplane the
propeller will spin counterclockwise. If it is spinning backwards,
disconnect the battery and reverse the polarity of the motor’s input
power leads.
Note: There is an error in the AR6400 manual for the pin output for the
brushed motor and brushless ESC. If viewed from the top of the
receiver, the correct pin output for brushed motors is: negative,
positive, empty pin. For brushless ESC the pin output is: signal,
positive, negative.
Receiver Control Unit Description, Arming
and Motor Control Test
