Horizon Hobby XR3I User Manual
3-Channel, 4-Model Memory
FM Computer Racing System
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Model Select . . . . . . . . . . . . . . . . 14
Model Name Entry . . . . . . . . . . . 14
Frame Rate Select . . . . . . . . . . . . 15
Auxiliary Channel
3 Function Select . . . . . . . . . . . . . 16
Grip Button C Function Select 17
Data Reset . . . . . . . . . . . . . . . . . . . 19
Copy Model Data . . . . . . . . . . . . 20
Accessing the Function Mode . . . 21
Throttle Deadband . . . . . . . . . . . . 22
Exponential . . . . . . . . . . . . . . . . . . 23
End-Point Adjustment . . . . . . . . 24
Programmable Mixing . . . . . . . . 26
Lap-Timer . . . . . . . . . . . . . . . . . . . 27
Sub-Trim . . . . . . . . . . . . . . . . . . . 28
Servo Reversing . . . . . . . . . . . . . 29
Accessing the Direct Trim Mode 30
Steering Trim . . . . . . . . . . . . . . . . 31
Throttle Trim . . . . . . . . . . . . . . . . . 32
Grip Lever B: Steering Dual-Rate
Trim Adjustment STG . . . . . . . . . 33
Grip Lever A: Brake Endpoint
Adjustment BRK . . . . . . . . . . . . . 34
Auxiliary Channel 3 Access . . . . 35
XR3i Data Sheets . . . . . . . . . . . . . . . 36
Frequency Chart . . . . . . . . . . . . . . . 38
Warranty and Service Information 39
Introduction . . . . . . . . . . . . . . . . . . . . . 2
XR3i Quick Start Setup . . . . . . . . . . . 3
Direct Trim Access . . . . . . . . . . . . . . 4
Servo Trim Adjustment . . . . . . . . . 4
System Features . . . . . . . . . . . . . . . . . 5
Transmitter . . . . . . . . . . . . . . . . . . . 5
Receiver . . . . . . . . . . . . . . . . . . . . . . 5
Servos . . . . . . . . . . . . . . . . . . . . . . . 5
System Specifications . . . . . . . . . . . 6
Components . . . . . . . . . . . . . . . . . . 6
Transmitter . . . . . . . . . . . . . . . . . . . 6
Receiver . . . . . . . . . . . . . . . . . . . . . . 6
Servos . . . . . . . . . . . . . . . . . . . . . . . 6
Control Identification
and Location . . . . . . . . . . . . . . . . . . . . 7
R/C Safety Precautions . . . . . . . . . . . 8
Steering Tension Adjustment . . . . . 9
Charging Jack . . . . . . . . . . . . . . . . . . 9
Receiver/Servo Connections
and Installation . . . . . . . . . . . . . . . . . 10
Operating Your Model . . . . . . . . . . 11
Servo Layout . . . . . . . . . . . . . . . . . . 11
Key Input and Display . . . . . . . . . . . 11
Display Screens . . . . . . . . . . . . . . . . 12
Normal Display . . . . . . . . . . . . . . 12
Up-Timer . . . . . . . . . . . . . . . . . . . _?
Low-Battery . . . . . . . . . . . . . . . . . 12
Lithium Battery . . . . . . . . . . . . . . . 12
Memory Backup . . . . . . . . . . . . . 12
Accessing the System Mode . . . . 13
Table of Contents
Introduction
Thank you for purchasing the XR3i 3-channel radio system.
This system has been designed to provide R/C racers with a
high quality, user-friendly radio system that can be relied
upon year after year, race after race. The XR3i's grip dial
accessible auxiliary third channel is ideal for use as a
mixture channel in gas boats or as a transmission shifter for
vehicles such as the Traxxas®T-Maxx. It is important that
you carefully read this manual before attempting to operate
your XR3i system.
For your convenience, a blank data sheet has been included
in the back of this manual. Once you have input all the
necessary data for a particular model into your transmitter,
we strongly recommend that you immediately write that
information down on the data sheet provided. This will
insure that in the rare case of a memory failure, you will not
lose the models' setup data.
For those who would like to get out to the track quickly
with just the basic radio setup, please refer to the Quick Start
section that follows.
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Included in this manual are in-depth instructions detailing
all the steps and procedures needed to correctly program
each of the XR3i's features. Quick Start covers the basic
programming information necessary to get you to the
track fast. Later, when you want to learn more about the
specific features of the XR3i, refer to the appropriate page(s)
in this manual for more detailed programming information.
Note: If the Auxiliary Channel 3 is required, refer
to the Auxiliary Channel 3 System Mode
(page 16) for instructions.
Servo Reversing
1. With the transmitter power switch on, press the Scroll key
to enter the Function mode.
2. Press the Scroll key until "REV.NORM" appears on
the screen. The "ST" indicates the steering servo
reversing screen.
3. Press the Increase or Decrease key to move the cursor to
the desired servo direction (Rev.Norm).
4. Press the Channel key once to access the throttle servo
reversing screen.
5. To select the direction of the throttle servo,
repeat Step 3 above.
6. Repeat Steps 2 and 3 to adjust Auxiliary Channel 3
if needed.
End-Point (Travel) Adjustment
1. From the Servo Reverse function, press the Scroll key
three times to access the End-Point (Travel) Adjustment
function (the EPA screen with "ST" will appear).
Steering Adjustment
2. Rotate the steering wheel in the desired direction (left or
right) to be adjusted.
3. Press the Increase or Decrease keys to select the desired
travel value.
Throttle Adjustment
4. Press the Channel key once. "TH" will appear on
the screen.
5. Pull the trigger for foward or push the trigger for brake
adjustment.
6. Press the Increase or Decrease keys to select the desired
travel value.
Auxiliary Channel 3 Adjustment
If a third channel is not required, proceed to Step 8.
7. Press the Channel key once. "AUX" will appear on
the screen.
8. Press the Increase or Decrease keys to select the desired
travel value.
9. Press the Scroll and Channel keys at the same time to exit
the function mode.
st
—
REV•NORM
SCROLL
ENTER
CHANNEL
CHANNEL
CHANNEL
SCROLL
SCROLL
INCREASE
CLEAR
DECREASE
INCREASE
CLEAR
DECREASE
INCREASE
CLEAR
DECREASE
INCREASE
CLEAR
DECREASE
Channel
ST = Steering
TH = Throttle
AUX =
Auxiliary
Channel 3
(optional)
Servo Direction
st
R/B
100
EPA
Adjustment Position
ST = Steering
TH = Throttle
AUX = Auxiliary Channel 3
(optional)
Current Value
L/F = Left/Forward
R/B = Right/Brake
CHANNEL
SCROLL
ENTER
CHANNEL
XR3i Quick Start Setup
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Servo Trim Adjustment
Steering
1. With the transmitter power switch on, move the digital
steering trim lever in the desired position to be adjusted.
The steering trim value screen will appear automatically.
Throttle
2. With the transmitter power switch on, move the digital
throttle trim lever in the desired position to be adjusted.
The throttle trim value screen will appear automatically.
Auxiliary Channel 3 (If active)
3. With the transmitter power switch on, move the
digital grip lever A in the desired position to be adjusted.
The Auxiliary Channel 3 value screen will appear
automatically.
stc
0
TRIM
thc
0
TRIM
ST.
Steering Trim
Function
Throttle Trim
Function
Current Value
Current Value
Throttle Trim
Steering Trim
brk
50
Brake Function
Current Value
Decrease
Diagram A
Increase
Grip Lever A
Brake Trim
Grip Lever B
Steering
Dual-Rate Trim
EPA
R/B
Direct Trim Access
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Transmitter
• 3 channels
• FM modulation
• Easy-to-read LCD graphics display
• 4-model memory
• 3-character model name entry
• Electronic digital trim levers for throttle and steering
• Two assignable electronic grip levers
• Auxiliary third channel accessible through Grip Lever A
• Direct display trim function
• Servo reversing
• Sub-trim
• Steering dual-rate
• Exponential (steering and throttle)
• Steering end-point adjustment
(two points: left and right)
• Brake/throttle endpoint adjustment
• Throttle deadband adjustment
• 50-lap timer
• Low-battery alarm
• Plug-in crystals
• Charge jack receptacle (rechargeable batteries
not included; order JRPB958)
R-135 Receiver
• 3 channels
• FM modulation
• 27MHz/75MHz available
• Battery Eliminator Circuitry (BEC)
• Patented ABC&W interference technology
Z590M Servo
• Metal gears for durability
• Great high torque car/buggy steering servo
• Indirect drive feedback potentiometer for additional
vibration protection
• Surface Mount Technology (SMT)
Z270 Servo
• Low current drain
• Indirect drive feedback potentiometer for additional
vibration protection
• Surface Mount Technology (SMT)
• Durable nylon gear train
System Features
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Transmitter XR3i
Receiver R-135
Servos Z590M x 1
Z270 x 1
Accessories BEC switch harness with
battery case, servo accessories
(for each servo),
instruction manual
R-135 Receiver
Z270 Servo
Components
Model number XR3i
Encoder 3-channel computer system
RF output 27MHz/75MHz
Modulation FM
Output power 190Mw
Current Drain 180mA
Power source 1.5V x 8 dry cell
(1.2V x 8 Ni-Cd optional)
Output pulse 1000–2000 (1500 neutral)
XR3i Transmitter
Torque 49 ounce inch (@6.0V)
Speed .19 sec/60° (@6.0V)
Weight 1.50 oz
Size (WxLxH) 0.73" x 1.51" x 1.37"
Motor 3-pole ferrite
Torque 85 ounce inch (@6.0V)
Speed .15 sec/60° (@6.0V)
Weight 1.6 oz
Size (WxLxH) 0.73" x 1.55" x .146"
Motor 3-pole ferrite
Model number NER-135
Type 3-channel/FM
ABC&W circuitry
Frequency 27MHz/75MHz
Sensitivity 5qs minimum
(microseconds)
Selectivity 8 KHz/50dB
Weight 1 oz
Size (WxLxH) 1.25" x 1.75" x 0.81"
Receiver Antenna 20"
Power supply 4.8–6.0V DC
Z590M Servo
System Specifications
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Antenna
Steering Wheel
Electronic Digital
Throttle Trim Lever
Dot Matrix
Multi- Data
LCD Display
Three-Character
Name Input
Digital Voltage
Reading
Electronic Digital
Grip Lever A
Electronic Digital
Grip Lever B
Grip Button C
Charge Jack
Power Switch
Scroll Button
= Enter Function
= Clear Function
Channel Button
Increase Button
Decrease Button
Electronic Digital
Steering Trim Lever
Throttle Trigger
Adjustable
Steering Tension
Battery Cover *
(8 "AA" batteries required)
*To remove battery cover, press down on the arrow and push the cover in
the direction of the arrow. Remove the battery case and install 8 "AA"
batteries in the direction shown as molded into the battery case. If transmitter
voltage fails to register, check for correct battery installation and voltage.
Control Identification and Location
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5. Before operating your model, make sure your frequency is
clear. If someone else is operating on the same frequency,
both models will go out of control, possibly causing
damage to the models, as well as others.
6. If at any time while operating your R/C model you sense
abnormal model functioning, end your operation
immediately. Do not operate your model again until
you are certain the problem has been corrected.
Caution: Control of your model is impossible without
sufficient voltage for the transmitter and receiver. A
weak transmitter battery will decrease your range of
operation, and a weak receiver battery will slow servo
movement and decrease your range of operation.
Check your receiver pack voltage often to avoid losing
control of your model. When using a model that
operates both the electric motor and the receiver from
the same battery (Battery Eliminating Circuitry or BEC),
you should discontinue use when the top speed sharply
decreases or you'll quickly lose control of your model.
For safe and reliable performance of your R/C model, please
carefully read and follow the guidelines below.
1. Radio control models are not toys. They are capable
of inflicting serious injury to people and property.
Use caution at all times when operating your model.
2. You are responsible for the safe operation of your R/C
model. You must properly install, test and operate your
model with a clear sense of that responsibility. Do not
take risks that might endanger yourself or others.
3. Running an R/C car in the streets is very dangerous to
both drivers and models. Avoid running your model in
areas occupied by full-size automobiles. To locate areas
where you can safely operate your model, contact your
local hobby shop for R/C tracks or clubs in your area.
4. When running an R/C boat, keep it away from any swim-
mers, full-size boats and wildlife. Also, watch carefully for
fishing lines that may get tangled in the propeller.
The Federal Communications Commission (FCC) requires
that changes in transmitter frequency must be preformed
only by an authorized service technician (Horizon Service
Center). Any transmitter frequency changes made by a noncertified technician may result in a violation of the FCC rules.
R/C Safety Precautions
Transmitter Crystal Replacement Notice
Crystal
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Charging Jack
Located on the left-hand side of the transmitter is the
charging jack that accepts only JR wall chargers. Please do
not attempt to use any other brand of wall charger, as it may
be reverse polarity and can cause damage to your system.
Only use the JR wall charger when the XR3i is equipped with
Ni-Cd batteries (JRPB958, available separately).
Charger Pigtail For Transmitter
Black To Positive
Red To Negative
JR TRANSMITTER CHARGE JACK POLARITY:
Steering Tension Adjustment
Steering tension is adjustable via the recessed screw located
beneath the steering wheel (see page 7 for exact location).
Turning the screw clockwise increases the steering tension.
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Your R-135 receiver is equipped with Battery Eliminator
Circuitry (BEC). The receiver gets its power from the model’s
Ni-Cd battery pack, thus saving the weight of an additional
receiver battery. Ni-Cd batteries from 4.8–8.4V (4–7 cells)
can be used safely. Higher voltage packs may damage the
receiver and servos.
Note: When using a separate receiver Ni-Cd as
a power source, the operating voltage range
is 4.8–6.0V (4- to 5-cell).
Attention: Make sure the male and female connectors
have the correct polarity (+/-) before connecting.
The servo lead and receiver case are molded so that
the lead can only be inserted correctly. Be sure to
orient the servo plug correctly for proper insertion.
You may use a separate receiver battery to power the receiver
(such as for some electric boats or in gas-powered vehicles).
A Ni-Cd pack plugged into the battery socket on your receiver
will operate your receiver. You can also use alkaline batteries
with the included battery box.
If you use a mechanical speed controller, please make sure it
has the correct connector for a BEC system (red connector).
See Figure A below for a typical setup. Most electronic speed
controllers are set up for BEC operation and plug directly
into your receiver (Figure B). See Figure B for a typical
setup and check your speed controller‘s manual for
correct installation.
Figure A – Connections to BEC receiver with mechanical speed controller. Ni-Cd battery and speed controller
are not included in the radio set.
Figure B – Connections to BEC receiver with electronic speed controller. Ni-Cd battery and speed controller
are not included in the radio set.
To Resistors
Mechanical
Speed Control
BEC Connector
Switch
R-135 Receiver
R-135
Z270/Z590M Servos
To Motor
Battery Box
(for use with optional separate
receiver battery power)
7.2V–8.4V Battery
7.2–8.4V Battery
R-135 Receiver
Third Channel
(Optional)
R-135
Z270/Z590M Servo
ESC
To Motor
Third channel
(Optional)
Receiver/Servo Connections and Installation
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BEC
BEC
11
It’s important to learn the proper sequence for switching
on/off your radio system.
Before Operation
Switch on the transmitter, then the receiver.
After Operation
Switch off the receiver, then the transmitter. This ensures
that you will always have a signal to the receiver and that
your R/C model will not operate out of control when you turn
off the transmitter.
Servo Mounting Flange
Rubber Grommets
Rubber Grommets
Servo Case
Servo Lead with Connector
Servo Output Shaft
Servo Mounting Flange
Servo Arm/Horn
Servo Arm Retaining Screw
Servo Eyelet
Z270/Z590M
Servo
Top View
To enter the Function mode, press the Scroll key
while the transmitter is on.
Press the Increase and Decrease keys
simultaneously to clear the screen or return
to factory preset.
To enter the System mode, press the Scroll
and Channel keys simultaneously and hold
while turning on the transmitter.
KEY
SCROLL
CHANNEL
INCREASE
DECREASE
Moves up through the available functions
Selects the desired channel
Increases the value of the selected function
Decreases the value of the selected function
USE
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
Operating Your Model
Servo Layout
Key Input and Display
Note: Rubber grommets
and (sometimes) eyelets
are used in fuel-powered
vehicles.
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Normal Display
When the power switch is turned on, the LCD screen will
read as shown below. This screen is referred to as the
Normal Display.
Note: If any of the electronic trim buttons are moved
while in this screen, the screen will automatically
change to display the trim in use. This is called the
Direct Trim mode. For more information on the feature,
please see page 30 of this manual.
Up-Timer
Note:If the Lap-Timer is enabled, an up-timer display
may alternatively be selected over the normal display
screen by pressing the Channel key. Pressing the
Channel key again will bring back the model name.
(For more information on this feature, please see
page 27.)
Low Battery/Lithium Battery Backup
When the voltage of the 8 "AA" batteries drops below 9.0V,
the XR3i's display screen will alternate between the Normal
and Low-Battery screen (BAT), and a continuous beeping
will occur, indicating that the batteries need to be replaced
before further use. The Low-Battery screen is active during
any operating modes.
Lithium Battery
Your XR3i radio system is equipped with a five-year lithium
battery backup system. This system is designed to protect
and retain all radio programming in the event that the
transmitter batteries drop below the required 9.0 volts, or
the transmitter battery case is removed during battery
changes. If after five years it becomes necessary to replace
the lithium battery, return your system to the Horizon Service
Center for repair (see address, page 39).
Memory Backup
If the Memory Backup screen appears, this indicates the
possibility of a ROM problem or the lithium battery is dead.
If you switch the power off and on again, but the transmitter
is in the default mode with all data lost, it is strongly
suggested that the XR3i transmitter be returned to the
Horizon Service Center for servicing (see Warranty
Information page 39).
bat
8.9V
md !
10.2V
0
10.2V
bak
ER
LAP
Display Screens
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