Futaba 4NBL AM - Manual (Page 5)

PRECAUTIONS
• Connect the receiver (or MCR-4A), servos, switches, and
battery firmly as shown in Fig. 7 (Fig. 8). Then extend the
transmitter and receiver antennas fully.
• Set the transmitter power switch to ON. Then set the receiv-
er (or MCR-4A) power switch to ON. The servos stop near
the neutral position. Operate the transmitter sticks and
check that each servo follows the movement of the stick.
• Connect the pushrod to each servo horn, then check if the
direction of travel of each servo matches the direction of
operation of its transmitter stick. To reverse the direction of
servo travel, switch the servo reversing switch.
• Operate each servo over its full travel, and check if the push-
rod binds or is too loose. Applying unreasonable force to the
servo horn will adversely affect the servo and quickly drain
the battery. Always make the travel of each control mecha-
nism somewhat larger than the full travel (including trim) of
the servo horn. Adjust the servo horns so that they move
smoothly even when the trim lever and stick are operated
simultaneously in the same direction.
• Be alert for noise.
This set is noise-resistant, but is not completely immune to
noise. We recommend the use of noiseless parts and noise
killer capacitor.
• When installing the switch harness, cut a rectangular hole
somewhat larger than the full stroke of the switch and install
the switch so that it moves smoothly from ON to OFF. This
also applies to the switch mount when the switch is install-
ed inside the fuselage and is turned on and off from the out-
side with a piece of wire, etc. Install the switch where it will
not be exposed to engine oil, dust, etc.
• Even though the receiver antenna is long, do not cut or
bundle it.
• Install the servos securely. Tighten the mounting screws un-
til the rubber grommet is crushed slightly. If the screws are
too tight, the cushioning effect will be adversely affected.
SERVO MOUNTING
Fig. 10
• Spare servo horns are supplied. Use them as needed.
• Wrap the receiver in sponge rubber. Waterproof and dust-
proof the receiver by placing it in a plastic bag and wrapping
a rubber band around the open end of the bag. Do the same
with the receiver/servo battery.
• Use the rubber bands wrapped around the receiver to hold
the servo and switch leads.
• After mounting is complete, recheck each part, then check
the range by making the transmitter antenna as short as
possible, extending the receiver antenna fully, and operating
the set from a distance of 20m to 30m. The movement of
each servo should follow the movement of each stick of the
transmitter.
• The motor controller connects to channel 3 in the MCR-4A.
• Motor aircraft vibrate less than engine aircraft, but the
receiver and servo should be vibration proofed.
•If the NiCd battery pack is connected in reverse,
the MCR-4A may be damaged beyond repair. Be
sure that the (+) and ( — ) connections are correct.
Black lead wire 0
Red lead wire + Fig. 11
• After mounting and checking are complete, take your model
to the shop where you purchased the set, or to an experienc-
ed radio control modeler, and ask them to teach you how to
handle your radio control set in the proper manner and to
inspect your set-up carefully.
• To enjoy radio control models fully, be sure to observe all
safety standards.
USING THE ANTENNA FREQUENCY FLAG
Attach the frequency flag to
the flag holder as shown in the
figure.
Fig. 12
The flag can be attached to.
and removed from, the
antenna with one touch.
Fig. 13
This horn permits shifting of the
servo neutral position at the servo
horn. Setting and shifting the neu-
tral position.
a) Angle divisions
1) The splined horn has 25 seg-
ments. The amount of change per
segment is; 360-25=14.4°.
2) The minimum adjustable angle
is determined by the number of
arms or number of the holes. For
four arms, the minimum adjust-
able angle is:
Fig. 14
b) Effect
To shift the holes center line to
the right (clockwise) relative to
baseline A, shift arm 2 to the po-
sition of arm 1 and set it to the
position closest to baseline A.
[Example] For a four arm horn,
the angular shift per segment is
14.4". The shift to the right is 90°
-(14.4 x 6) = 3.6°.
To shift by the same angle in the
opposite direction, use the oppo-
site arm number.
Fig. 15
For a six arm horn, turn the arm
counterclockwise and set arm 2
to the position of arm 1. The ad-
justable angle is 60° - (14.4 x 4)
=2.4°.
Arm 3 shift 4.8° to the right, arm
6 shifts 2.4° to the left, and arm 4
shifts 7.2° to the right and left.
Fig. 16