G-20
G-21
The JR R921 receiver features two types of fail-safe:
SmartSafe and Preset Fail-safe.
SmartSafe
This type of fail-safe is especially ideal for most types of
electric aircraft and is also recommended for most types
of gas- and glow-powered airplanes and helicopters.
Here’s how SmartSafe works.
Receiver Power Only
When the receiver only is turned on (no transmitter signal
is present), all servos except for the throttle are driven to
their preset fail-safe positions, normally control surfaces
at neutral and the landing gear down. These fail-safe
positions are stored in the receiver during binding. At this
time the throttle channel has no output, to avoid operating
or arming the electronic speed control. In glow-powered
models, the throttle servo has no input so it remains in its
current position.
After Connection
When the transmitter is turned on and after the receiver
connects to the transmitter, normal control of all channels
occurs. After the system makes a connection, if loss of
signal occurs, SmartSafe drives the throttle servo only
to its preset fail-safe position (low throttle) that was set
during binding. All other channels hold their last position.
When the signal is regained, the system immediately (less
than 4 ms) regains control.
Preset Fail-Safe
Preset fail-safe is ideal for sailplanes and preferred by
some modelers for their glow- and gas-powered aircraft.
Receiver Power Only
When the receiver only is turned on (no transmitter signal
is present) all servos except for the throttle are driven to
their preset fail-safe positions, normally control surfaces
at neutral and the landing gear down. These fail-safe
positions are stored in the receiver during binding. At this
time the throttle channel has no output, to avoid operating
or arming the electronic speed control. In glow-powered
models, the throttle servo has no input so it remains in its
current position.
After Connection
When the transmitter is turned on and after the receiver
connects to the transmitter, normal control of all
channels occurs. After the system makes a connection,
if loss of signal occurs preset fail-safe drives all servos
to their preset fail-safe positions. For sailplanes,
it’s recommended that the spoilers/flaps deploy to
de-thermalize the aircraft, preventing a flyaway. Some
powered modelers prefer to use this fail-safe system to
program a slight turn and low throttle to prevent their
aircraft from flying away. When the signal is regained, the
system immediately (in less than 4 ms) regains control.
Programming SmartSafe
(All Spektrum Aircraft Receivers)
Leave the bind plug in during the binding process
and remove it only after the receiver connects to the
transmitter. After the connection is made, confirmed by
operating the servos, remove the bind plug. The receiver
is now programmed for SmartSafe.
Fail-Safe Functions
(JR R921, R922, R1221, R1222 and Spektrum
AR7100, AR7100R, AR7600, AR9000, AR9100
Receivers Only)
During the binding process, insert the bind plug in the bind
port or in the charge jack, as the receiver is powered up.
The LEDs in each receiver should blink, indicating that the
receiver is in bind mode. Before binding the receiver to the
transmitter and with the receiver in bind mode, remove the
bind plug. The LEDs will still be blinking. With the control
sticks and switches in the desired fail-safe positions, bind
the transmitter to the receiver by pressing and holding the
bind buttons on the back of the transmitter/module and
turning on the transmitter. The system should connect in
less than 15 seconds. The receiver is now programmed for
preset fail-safe.
Note
: Fail-safe positions are stored via the stick and
switch positions on the transmitter during binding.
Standard Range Testing
Before each flying session, and especially with a new
model, you need to perform a range check. The X9503 2.4
incorporates a range testing system which, when the bind
button on the transmitter is pressed and held, reduces the
output power, allowing a range check.
Range Testing the X9503 2.4
Press and hold the bind button
30 paces (90 feet)
1. With the model resting on the ground, stand 30 paces
(approx. 90 feet) away from the model.
2. Face the model with the transmitter in your normal
flying position and depress and hold the bind button
on the back of the transmitter. This causes reduced
power output from the transmitter.
3. You should have total control of the model with the
button depressed at 30 paces (90 feet).
4. If control issues exist, call the JR Service Center at
1-877-504-0233 for further assistance.
Programming Preset Fail-Safe
Summary of Contents for X9503 2.4
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