Receiver And Servos - FUTABA FP-8SSHP Instruction Manual

RECEIVER AND SERVOS

FS (Fail safe) and HOLD functions
•The HOLD function holds all the servos at the po-
sition immediately before a bad set of signal is
received. When normal radio waves arrive, or the
interference disappears, hold is released.
•The FAIL SAFE function moves the servos to a
preset position set at the transmitter, one second
after interference is received. When the interference
disappears, FAIL SAFE is released.
Although already described in the transmitter sec-
tion, FS ( f a i l safe) is a function which moves the
servo of all the channels to the position preset at the
transmitter when continuous strong noise is received
by the receiver for about one second or longer. The
set operates in the hold mode during the one second
the noise or interference is received.
B.F.S, (battery fail safe) function
The B.F.S, locks the throttle channel only in the posi-
tion preset by FS when there is very little power left
in the receiver and servo side Nicd battery. (If nothing
is set, the throttle channel becomes medium slow.)
The throttle channel can be released and operated for
36 seconds by moving the throttle stick in the slow
direction. After 36 seconds, the set reenters the B.F.S.
mode. When the set enters the B.F.S, state, immediate-
ly land the aircraft.
•Connect the receiver, servo switch, and bat-
tery firmly as shown in Fig. 57. Then extend
the transmitter and receiver antennas to their
full length.
•Set the transmitter power switch to ON, then
set the receiver switch to ON. The servos stop
near the neutral position. Operate the transmit-
ter 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 trans-
mitter stick. If the direction of servo travel is
opposite the desired direction, switch the servo
reversing switch.
•Operate each servo to its full stroke and check
if the pushrod binds or is loose. Unreasonable
force applied to the servo horns is not only bad
for the horns, but will also cause the battery to
run down quickly. Always make the stroke of
each control mechanism somewhat larger than
the full stroke (including the trim component)
of the servo horn. Adjust the servo horns so
they move smoothly even when the trim lever
and stick are operated simultaneously in the
same direction.
•Be alert for noise.
This set has noise rejection circuits, however,
noiseless parts are recommended.
•When installing the switch harness, cut a rec-
tangular hole somewhat larger than the full
stroke of the switch, and install the switch so it
moves smoothly from ON to OFF. Install the
switch inside the fuselage and attach a piece of
wire to the switch so it can be turned on and
off from the outside. Install the switch where it
will not be exposed to engine oil, dust, etc.
•Even though the receiver antenna may appear
to be too long, do not cut or bundle it.
•Install the servos securely. Tighten the mount-
ing screws until the rubber damper is slightly
crushed. If the screws are too tight, the cushion-
ing affect of the rubber damper will be lost.
•The crystal can be changed from the outside
of the receiver case. Always use the Futaba
transmitter/receiver matched crystal set to
change the band.
•A spare servo horn is supplied with the set.
Use this horn as needed.
•Use extension cords as needed.
•Wrap the receiver in sponge rubber. Water-
and dust-proof the receiver by placing it in a
plastic bag and wrapping a rubber band around
the mouth of the bag. Do the same with the
receiver/servo battery.
•Use the rubber bands wrapped around the re-
ceiver to hold the servo and switch leads.
•After mounting is complete, recheck each part,
then check the transmitting range by making
the transmitter antenna as short as possible, ex-
tending the receiver antenna to its full length,
and operating the transmitter from a distance
of 20m to 30m from the receiver. The move-
ment of each servo should follow the move-
ment of each transmitter stick.
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