Horizon Hobby XR2I JR XR2i 2 Channel AM Radio System User Manual XR2i Manual Complete
Horizon Hobby, LLC JR XR2i 2 Channel AM Radio System XR2i Manual Complete
Contents
- 1. XR2i Manual
- 2. XR2i Manual Complete
XR2i Manual Complete
2-Channel, 2-Model Memory
AM Computer Racing System
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2
Key Input and Display 11
Display Screens 12
Normal Display 12
Low Battery 12
Lithium Battery 12
Memory Backup 12
Accessing the System Mode 13
Model Select 14
Model Name Entry 14
Grip Button C Funtion Select 15
Data Reset 16
Accessing the Function Mode 17
End-Point Adjustment 18
Sub-Trim 19
Servo Reversing 20
Accessing the Direct
Trim Mode 21
Steering Trim 22
Throttle Trim 23
Grip Lever B: Steering Dual-
Rate Trim Adjustment STG 24
Grip Lever A: Brake End-Point
Adjustment BRK 25
XR2i Data Sheets 26
Frequency Chart 27
Warranty and 27/28
Service Information
Introduction to
XR2i Quick Start Setup 3
Direct Trim Access 4
Steering and Throttle/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
RC Safety Precautions 8
Steering Tension Adjustment 9
Charging Jack 9
Receiver/Servo Connections
and Installation 10
Operating Your Model 11
Servo Layout 11
Table of Contents
Thank you for purchasing the XR2i 2-channel radio
system. This system has been designed to provide RC
racers with a high-quality, user-friendly radio system
that can be relied upon year after year, race after race.
It is important that you carefully read this manual
before attempting to operate your XR2i 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 down that information 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.
Introduction
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3
st
—
REV•NORM
Channel
ST = Steering
TH = Throttle
Servo Direction
st
100
EPA
Adjustment position
ST = Steering
TH = Throttle
Current Value
XR2i Quick Start Setup
Included in this manual are in-depth instructions
detailing all the steps and procedures needed to
correctly program each of the XR2i'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
XR2i, refer to the appropriate page(s) in this manual
for more detailed programming information.
Servo Reversing End-Point (Travel) Adjustment
1. With the transmitter power switch on, press the
Scroll key to enter the Function mode.
SCROLL
ENTER
CHANNEL
CHANNEL
SCROLL
INCREASE
CLEAR
DECREASE
INCREASE
CLEAR
DECREASE
INCREASE
CLEAR
DECREASE
CHANNEL
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.
1. From the Servo Reverse function, press the Scroll
key once 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.
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4
Direct Trim Access
Steering and Throttle 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.
stc
0
TRIM
thc
0
TRIM
Steering Trim
Function
Throttle Trim
Function
Current Value
brk
50
EPA Brake Function
Current Value
Current Value
R/B
ST.
Throttle Trim
Steering Trim
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5
Transmitter
• 2 channels
• AM modulation
• Easy-to-read LCD graphics display
• 2-model memory
• 3-character model name entry
• Electronic digital trim levers for throttle and steering
• Assignable electronic grip lever
• Direct display trim function
• Servo reversing
• Sub-trim
• Steering dual-rate
• Steering end-point adjustment
(two points: left and right)
• Brake/throttle end-point adjustment
• Low-battery alarm
• Plug-in crystals
• Charge jack receptacle (rechargeable batteries not
included; order JRPB958)
R-125 Receiver
• 2 channels
• AM 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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6
Transmitter XR2i
Receiver R-125
Servos Z590M x 1
Z270 x 1
Accessories BEC switch harness with
battery case, servo accessories
(for each servo),
instruction manual
R-125 Receiver
Z270 Servo
Components
Model number XR2i
Encoder 2-channel computer system
RF output 27MHz/75MHz
Modulation AM
Output power 195mW
Current Drain 150mA
Power source 1.5V x 8 dry cell
(1.2V x 8 Ni-Cd optional)
Output pulse 1000–2000 (1500 neutral)
XR2i Transmitter
Torque 49 ounce inch (@6.0V)
Speed .19 sec/60° (@6.0V)
Weight 1.5 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-125
Type 2-channel/AM
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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7
Antenna
Electronic Digital Steering
Trim Lever
Electronic Digital
Throttle Lever
Multi Data
LCD Display
Three-Character
Name Input
Digital Voltage
Reading
Electronic Digital
Grip Lever A
Electronic Digital
Grip Lever B
Power Switch
Charge Jack
Scroll Button
= Enter Function
= Clear Function
Channel Button
Decrease Button
Increase Button
Steering Tension (Adjustable)
Steering Wheel
with Foam Grip
Throttle Trigger
(Adjustable)
Grip Button C
Battery Cover *
(8 “AA„Batteries Required)
*To remove the 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 the transmitter voltage fails to
register, check for correct battery installation and voltage.
Control Identification and Location
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8
RC Safety Precautions
Transmitter Crystal Replacement Notice
For safe and reliable performance of your RC 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
RC 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 RC 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 RC tracks
or clubs in your area.
4. When running an RC boat, keep it away from any
swimmers, full-size boats and wildlife. Also, watch
carefully for fishing lines that may get tangled in
the propeller.
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 RC 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 bat-
tery 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.
The Federal Communications Commission (FCC)
requires that changes in transmitter frequency
must be performed only by an authorized service
technician (Horizon Service Center). Any transmitter
frequency changes made by a non-certified
technician may result in a violation of FCC rules.
Crystal
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9
Steering Tension Adjustment
Charging Jack
Steering tension is adjustable via the recessed screw
located beneath the steering wheel (see page 7 for exact location). Turning the screw clockwise increas-
es the steering tension.
Charger Pigtail For Transmitter
Black To Positive
Red To Negative
JR TRANSMITTER CHARGE JACK POLARITY:
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 XR2i is equipped with Ni-Cd batteries
(JRPB958, available separately).
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10
Receiver/Servo Connections and Installation
Your R-125 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.
BEC
BEC
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-125 Receiver
R-125 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-125 Receiver
Third Channel
(Optional)
R-125
Z270/Z590M Servo
ESC
To Motor
Third channel
(Optional)
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11
Operating Your Model
Servo Layout
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 RC 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
Key Input and Display
Note: Rubber grommets
and (sometimes) eyelets
are used in fuel-powered
vehicles.
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12
Display Screens
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 21
of this manual.
Low Battery/Lithium Battery Backup
When the voltage of the 8 "AA" batteries drops below
9.0V, the XR2i's display screen will alternate between
the Normal and Low-Battery screen (BAT) and a con-
tinuous 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 XR2i 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 28).
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 XR2i
transmitter be returned to the Horizon Service Center
for servicing (see Warranty Information page 27).
bat
8.9V
bak
ER
md !
10.2V
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Accessing the System Mode
To enter the System mode, press both the Scroll and
Channel keys at the same time while turning on the
transmitter power switch. By pressing the Scroll key,
you can now choose Model Select, Model Name Input,
Grip button C function or the Data Reset function as
shown here on the System Mode flow chart.
Information for each function is located on the
page number listed next to the function name on
the flow chart.
To exit the System mode, press the Scroll and
Channel keys at the same time or simply turn off
the transmitter.
Note: If you turn the transmitter off and immedi-
ately enter System mode again, you will be
returned to the last System mode function used
instead of the model select function. While in
System mode, there is no RF output generated by
the transmitter. Adjustments can be performed
with reduced battery power consumption. If you
exit System mode by pressing the Scroll and
Channel key at the same time, RF output will not
be enabled until you first turn off the transmitter.
Model Name Entry
(page 14)
21
md !
1
mdl
1
Model Select
(page 14)
20
clr
1
gbc
0
Data Reset
(page 16)
25
Grip Button C
Function
(page 15)
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14
Model Name Entry
(System Mode)
Model Select
(System Mode)
The XR2i has memory for two models. This feature
allows for two different models to be operated with
the same transmitter (additional receivers and servos
must be purchased separately) or one model with
two different race setups.
Accessing the Model Select Function
1. Press the Scroll and Channel keys at the same time
and hold.
2. Turn the transmitter power switch on to enter
System mode.
3. If "MDL" does not appear on the screen, press the
Scroll key until "MDL" appears.
4. Press the Increase or Decrease keys to select the
desired model number (1 or 2).
5. Press the Scroll key to access the Model Name
Entry function.
6. To exit System mode, either turn the transmitter
power switch off or press the Scroll and Channel
keys at the same time.
md !
1
Character to
be Adjusted
Current Model
Number
mdl
1
Model Select
Fuction
Current Model
Number
Press and hold the
Scroll and Channel keys
at the same time while
turning transmitter
power switch on.
Press the Increase
or Decrease keys to
select the desired
model to be used
(1 or 2).
Press and hold the Scroll
and Channel keys at the
same time while turning
transmitter power switch
on. Next, press the Scroll
key until the flashing
“M” appears.
Press the Channel
key to select the
character to be
changed.
Press the Increase or
Decrease keys to
select the correct
letter/number to be used.
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
The XR2i allows a three-character name to be input
for each of the two models available. The current
model with name will then be displayed in the Normal
display screen. This feature is useful to help identify
different models, setups, etc.
Accessing the Model Name
Entry Function
1. Press the Scroll and Channel keys at the same time
and hold.
2. Turn on the transmitter power switch to enter the
System mode.
3. Press the Scroll key until "MD1" appears on the
screen with the first character flashing.
4. Press the Increase or Decrease keys to select the
correct letter/number for the first character (flashing).
5. To change the remaining two characters, press the
Channel key until the desired character to be
changed is flashing.
6. Press the Scroll key to access the Grip Button
C function.
7. To exit the System mode, either turn the
transmitter power switch off or press the Scroll
and Channel keys at the same time.
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15
Grip Button C Function Select (System Mode)
The Grip Button C function of the XR2i allows you to
select from 2 different functions available. Use the
information below to select the correct Grip Button C
assignment for your particular installation.
0 = The 0, or off function, is the default setting and
does not assign a function to Grip Button C.
Eb = The Eb or Emergency Steering Button function is
designed to override the value of Grip Dial B and pro-
vide 100% steering rate. This feature is useful if you
have reduced the steering rate to make your vehicle
easier to drive but need full steering in an emergency
situation such as a collision.
Accessing the Grip Button C Function
1. Press the Scroll and Channel keys at the same time
and hold.
2. Turn on the transmitter power switch to enter
System mode.
3. Press the Scroll key until "GBC" appears on
the screen.
4. Press the Increase or Decrease key to select the
correct Grip Button C function type to be used.
5. Press the Scroll key to access the Data Reset
function.
6. To exit the System mode, either turn the
transmitter power switch off or press the Scroll and
Channel keys at the same time.
gbc
0
Grip Button C
Function
Grip Button C is
Inhibited
gbc
EB
Grip Button C
Function
Emergency
Steering Button
is Activated
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16
Data Reset (System Mode)
The Data Reset function allows you to reset all the
programming in the selected model (1 or 2) to the
factory default settings. Before using the Data Reset
function, it is important to enter the Model Select
function and check to make sure the current model
number indicated (1 or 2) is the model to which you
want to reset to the factory default settings. The
Model Select function is described on page 14.
Accessing the Data Reset Function
1. Press the Scroll and Channel keys at the same time
and hold.
2. Turn on the transmitter power switch to enter the
System mode.
3. Press the Scroll key until "CLR" appears on
the screen.
4. Press the Increase and Decrease keys at the same
time to reset the data. To confirm that the selected
model's programming has been reset, a beep will
sound and the model number selected (1 or 2) will
stop flashing.
5. Press the Scroll key to access the Copy Model
Data function.
6. To exit the System mode, either turn the
transmitter power switch off or press the Scroll
and Channel keys at the same time.
clr
1Model to
be Reset
Press and hold the Scroll
and Channel keys at the
same time while turning
the transmitter power
switch on. Next, press
the Scroll key until
“CLR” appears.
Press the Increase and Decrease keys at the
same time to reset (clear) all settings for the
selected model to the factory default settings
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
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17
Accessing the Function Mode
To enter the Function mode, it is necessary to first
turn on the transmitter's power switch. Next, press
the Scroll key until a beep is heard. The display will
change to show the first function listed on the
Function Mode flow chart as shown below. Press the
Scroll key to scroll down through the functions one by
one, as shown in the flow chart. Once the desired
function has been reached, use the Channel key to
select the appropriate channel (if applicable). To
adjust the values of the function, simply press the
Increase (+) or Decrease (-) keys until the desired
value is displayed on the screen. To exit function
mode, press the Scroll and Channel keys at the same
time. The next time you enter Function mode, you will
be returned to the last function accessed.
sts
0
TRIM
st
100
EPA
ths
0
TRIM
st SB-TRM
Channel
Key
Channel
Key
Channel
Key
Sub-Trim
(page 19)
Servo Reversing
(page 20)
—
REV•NORM
—
REV•NORM
R/B
L/F
th
100
EPA
Channel
Key
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18
End-Point Adjustment (Function Mode)
The End-Point Adjustment feature of the XR2i allows
the maximum travel of both the steering and throttle
servos to be increased or decreased in each direction
to achieve the exact servo movement needed. The
End-Point Adjustment range is from 0% to 125% and
is factory set to 100% for both channels. The value
displayed on the screen depends on the current
position of the steering wheel, trigger, or trim lever to
be adjusted. This feature is very useful either to
maximize servo travel or to reduce servo over-travel
to eliminate servo binding (servo moves further than
control mechanism allows), without the need for
mechanical linkage adjustment.
The screens below are accessed by turning the wheel
to the desired direction to be adjusted (left or right),
by moving the trigger to the forward or backward
(brake) position, or by moving the Grip Lever A to the
forward or back positions.
L/F
st
100
EPA
R/B
st
100
EPA
Steering Left
End-Point Adjustment
Current Value
Values: 0 to 125
Clear = 100
Steering Right
End-Point Adjustment
Current Value
Values: 0 to 125
Clear = 100
L/F
th
100
EPA
R/B
th
100
EPA
Forward Throttle
End-Point Adjustment
Current Value
Values: 0 to 125
Clear = 100
Backward Throttle (Brake)
End-Point Adjustment
Current Value
Values: 0 to 125
Clear = 100
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19
Accessing The End-Point
Adjustment Function
1. Turn on the transmitter power switch.
2. Press the Scroll key to enter Function mode.
3. Press the Scroll key until "EPA" appears in small
letters on the left side of the screen.
4. Press the Channel key to select the desired channel
to be adjusted.
Steering = ST R/B(steering right) or ST L/F
(steering left)
Throttle = TH L/F (forward) or TH R/B (braking
or reverse)
5. Move the steering wheel or trigger in the desired
direction for adjustment (left/right, forward/reverse
or brake). Press the Increase or Decrease key to
achieve the desired amount of travel. Move the
wheel or trigger in the opposite direction to adjust
the travel in the opposite direction.
6. Press the Scroll key to access the
Sub-Trim function.
7. To exit the Function mode, either turn off the
transmitter power switch or press the Scroll and
Channel keys at the same time.
Note: When setting the end point adjustment
values for the steering function, it is suggested
that, if possible, the maximum travel values be
set to an equal value in both directions to
maintain proper steering control.
Sub-Trim (Function Mode)
Press the Scroll key
until "EPA" appears on
the screen
Press the Channel key
to select the channel to
be adjusted
Move the wheel/trigger or Grip Button C in the desired direction and press
either the Increase or Decrease keys to achieve the desired travel value
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
The Sub-Trim function of the XR2i is an electronic
trimming feature that allows the neutral position of
the servo on either the steering or throttle channel to
be moved, while allowing the electronic trim lever for
that channel to remain in the center position. This fea-
ture is very useful, as it allows the servo arm/wheel
position to be moved to help with control linkage
installation, eliminating the need to make mechanical
linkage adjustments.
Although the Sub-Trim function is a very useful
feature, it is suggested that only small amounts of
sub-trim be used so that no unwanted, non-equal
servo travel is created. It is suggested that less than
30 points of Sub-Trim be used during adjustment. If
more than 30 points of Sub-Trim are required, it is
suggested that a mechanical linkage adjustment be
performed.
Accessing the Sub-Trim Function
1. Turn on the transmitter power switch.
2. Press the Scroll key to enter Function mode.
3. Press the Scroll key until "TRIM" appears in small
letters to the left of the screen.
4. Press the Channel key to select the channel to be
adjusted (Steering, Throttle or Auxiliary Channel 3).
5. Press the Increase or Decrease keys until the
proper servo position is achieved.
6. Press the Scroll key to access the Servo
Reversing function.
7. To exit the Function mode, either turn off the
transmitter power switch or press the Scroll and
Channel keys at the same time.
sts
0
TRIM
Current Channel
STS = Steering
THS = Throttle
AUS = Auxiliary
Channel 3
Current Value
Press the Channel key
to select the desired
channel to be adjusted.
STS = Steering
THS = Throttle
AUS = Auxiliary
Channel 3
Press the Scroll key
until "TRIM" appears
on the screen.
Press the Increase or Decrease keys to achieve
the desired Sub-Trim Value.
Values: R/B 125 0 R/F 125
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
5189 JR XR-2i manual 9/18/02 12:01 PM Page 19
20
Servo Reversing (Function Mode)
The Servo Reversing feature of the XR2i is a very con-
venient feature when setting up a new model. The
purpose of the servo reversing function is to change
the direction of the servo rotation in relation to the
wheel/trigger movement. The Servo Reversing
function is available for the steering and throttle of
the XR2i.
Accessing the Servo
Reversing Function
1. Turn the transmitter power switch on.
2. Press the Scroll key to access Function mode.
3. Press the Scroll key until "REV.NORM" appears in
small letters to the right of the screen.
4. Press the Channel key to select the channel to be
changed (ST = Steering, TH = Throttle).
5. Press the Increase or Decrease keys to move the
cursor to the desired direction.
6. To exit the Function mode, either turn off the
transmitter power switch or press the Scroll and
Channel keys at the same time.
Current Channel
ST = Steering
TH = Throttle
AUX = Auxiliary
Channel 3
Current Servo
Direction
st
—
REV•NORM
Press the Channel key
to select the desired
channel to be adjusted.
STS = Steering
THS = Throttle
AUX = Auxiliary
Channel 3
Press the Mode key
until “REV. NORM”
appears on the screen.
Press the Increase or Decrease keys to move
the cursor to the desired servo direction.
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
5189 JR XR-2i manual 9/18/02 12:01 PM Page 20
21
Accessing the Direct Trim Mode
stc
0
thc
0
brk
50
EPA
stg
70∞
RATE
Steering Trim
(page 22)
Throttle Trim
(page 23)
Steering Dual-Rate
(Grip Lever B)
(page 24)
Brake Travel Adjustment
(Grip Lever A),
(page 25)
TRIM
TRIM
R/B
The Direct Mode function of the XR2i is accessible
through the use of the electronic throttle or steering
trim levers, as well as the two electronic grip levers
(A&B) located on the upper portion of the grip handle.
This function allows for quick trim adjustment of
these controls.
To access the Direct Trim Mode function, turn on the
transmitter power switch. Next, move the desired trim
lever to be adjusted. The appropriate screen for the
selected trim lever will be displayed. To adjust, simply
move the trim lever in the desired direction until the
correct amount of trim is achieved. Once the desired
trim is achieved, the screen will return to the Normal
display screen after approximately two seconds from
the last trim input. If the Increase or Decrease keys
are pressed any time during the two seconds, the
system will return to the previous screen in use.
5189 JR XR-2i manual 9/18/02 12:01 PM Page 21
22
Steering Trim (STC)
TRIM.
Values: L/F 60 0 R/B 60
stc
0Current Value
Press the Increase and Decrease keys at the same
time to reset the throttle trim value to zero.
Throttle Trim Location
Throttle Trim
Decrease
Increase
INCREASE
CLEAR
DECREASE
ST.
The XR2i electronic Steering Trim lever, located just
above the steering wheel, allows the center position of
the servo to be manipulated in either direction to
achieve precise centering of the steering assembly.
Steering travel end-point adjustment values (page 24)
remain completely independent from the steering
trim, unless the trim value exceeds the selected end-
point values. (For example, if trim values are set at
30 and end-point values at 15, steering trim will
over-ride/alter the end-point value.)
To adjust the steering trim servo position, move the
electronic Steering Trim lever either to the left or the
right. As soon as the trim is moved, the "STC"
Steering Trim screen will appear and will continue to
be displayed unless the trim lever is untouched for a
period of two seconds. To reset the trim value to 0,
press the Increase and Decrease keys at the same
time while the "STC" screen is displayed.
Each click will provide 0.3° of trim to the center of the
steering servo with a maximum of 12° allowed.
Note: Each click will not always result in a
change of the value displayed.
5189 JR XR-2i manual 9/18/02 12:01 PM Page 22
23
Throttle Trim (THC)
The XR2i's electronic Throttle Trim lever, located to
the left of the steering wheel, allows the center posi-
tion of the servo to be manipulated in either direction
to achieve precise centering of the throttle trigger
neutral position. Throttle end-point adjustment values
(page 23) remain completely independent from the
throttle trim, unless the trim value exceeds the selected
end-point values. (For example, if the trim value is set
at 40 and the end-point values at 30, Throttle Trim will
override/alter the end-point value.)
Each click will provide 0.3° of trim to the throttle
servo with a maximum of 24° allowed.
Note: Each click will not always result in a
change of the value displayed.
To adjust the Throttle Trim servo position, move the
electronic steering trim lever either up or down. As
soon as the trim is moved, the "THC" Throttle Trim
screen will appear and will continue to be displayed
unless the trim lever is untouched for a period of two
seconds. To reset the trim value to zero, press the
Increase and Decrease keys at the same time while
the "THC" screen is displayed.
Throttle Trim Location
Throttle Trim
Decrease
Increase
ST.
TRIM.
Values: L/F 60 0 R/B 60
stc
0Current Value
Press the Increase and Decrease keys at the same
time to reset the throttle trim value to zero.
INCREASE
CLEAR
DECREASE
5189 JR XR-2i manual 9/18/02 12:01 PM Page 23
24
Grip Lever B: Steering Dual-Rate Trim Adjustment (STG)
INCREASE
CLEAR
DECREASE
stg
70∞
RATE
Current Value
(20% to 100%)
Press the Increase and Decrease keys at the same time to
reset the steering dual rate trim to the factory preset (70%).
Decrease Increase
Grip Lever B
Steering Dual-
Rate Trim
The Steering Dual-Rate adjustment, located at Grip
Lever B, allows the Dual-Rate value (maximum servo
travel) to be increased or decreased within a range
from 100% through 20% of the total end point value
established in the steering EPA function. This function
is very useful in race conditions as it allows you to
custom tailor the steering radius and sensitivity for
the current track conditions.
Please note that since the Dual-Rate value shown in
the "STG" screen is the percentage of the end-point
value established in the Steering EPA function, the
value will not always increase or decrease each time
Grip Lever B is moved.
If the Emergency Steering button function (page 15)
is active, pressing Grip Button C will restore the steer-
ing dual rate to 100% until the button is released.
To adjust the Steering Dual-Rate value, move the elec-
tronic Grip Lever B either left (-) or right (+). As soon
as the trim is moved, the "STG" Steering Dual-Rate
screen will appear and will continue to be displayed
unless the Grip Lever B is untouched for a period of
two seconds. To reset the trim value to the factory
preset setting of 70%, press the Increase and
Decrease keys at the same time while the "STG"
screen is displayed.
5189 JR XR-2i manual 9/18/02 12:01 PM Page 24
25
Grip Lever A: Brake End-Point Adjustment BRK/Auxilary
Channel 3 Access
The Brake End-Point Adjustment, located at Grip Lever
A, allows the maximum servo travel on the braking side
of the throttle trigger to be increased or decreased
from 100% to 0% (off). This function is very useful in
race conditions as it allows the racer to custom tailor
the "panic" brake value to maximize the car's braking
power for the current track conditions. Please note
that since the Brake end-point value shown in the "BRK"
screen is a percentage of the total braking value
established in the End-Point Adjustment function
(page 24), the value will not always increase or
decrease each time the Grip Lever A is moved.
To adjust the brake end-point value, move the
electronic Grip Lever A either left (-) or right (+). As
soon as the grip lever is moved, the BRK End-Point
Adjustment screen will appear and will continue to
be displayed unless the Grip Lever A is untouched
for a period of two seconds.
Current Value
(100% to 0%)
brk
50
EPA
Move the grip lever A to the left or right to decrease or increase values.
R/B
Decrease Increase
Grip Lever A
Brake Trim
5189 JR XR-2i manual 9/18/02 12:01 PM Page 25
26
STEERING THROTTLE
END-POINT ADJUSTMENT L__________ R__________ F__________ B__________
SUB-TRIM
SERVO REVERSING REV/NORM REV/NORM
Function Mode
MODEL NUMBER 1 2
MODEL NAME
GRIP BUTTON C O/E
System Mode
TRIM STEERING THROTTLE
VALUES –/+ –/+
GRIP LEVER B
STEERING D/R %
GRIP BRAKE EPA
LEVER A VALUES
Direct Mode
STEERING THROTTLE
SUB-TRIM
SERVO REVERSING REV/NORM REV/NORM
Function Mode
MODEL NUMBER 1 2
MODEL NAME
GRIP BUTTON C O/Eb
System Mode
TRIM STEERING THROTTLE
VALUES –/+ –/+
GRIP LEVER B
STEERING D/R %
BRAKE EPA
GRIP
LEVER A VALUES %
Direct Mode
XR2i Data Sheet
5189 JR XR-2i manual 9/18/02 12:01 PM Page 26
27
FREQUENCY (MHZ)CHANNEL FREQUENCY (MHZ)CHANNEL FREQUENCY (MHZ)CHANNEL
26.995 ..........................1
27.045 ..........................2
27.095 ..........................3
27.145 ..........................4
27.195 ..........................5
27.255 ..........................6
75.410........................61
75.430........................62
75.450........................63
75.470........................64
75.490........................65
75.510........................66
75.530........................67
75.550........................68
75.570........................69
75.590........................70
75.610........................71
75.630........................72
75.650........................73
75.670........................74
75.690........................75
75.710........................76
75.730........................77
75.750........................78
75.770........................79
75.790........................80
75.810........................81
75.830........................82
75.850........................83
75.870........................84
75.890........................85
75.910........................86
75.930........................87
75.950........................88
75.970........................89
75.990........................90
FREQUENCYCHART
Frequency Chart
Transmitter Crystal Replacement Notice
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 non-certified technician may
result in a violation of the FCC rules.
Warranty Coverage
Your new JR Remote Control Radio System is
warranted to the original purchaser against manufac-
turer defects in material and workmanship for 3 years
from the date of purchase. During this period, Horizon
Service Center will repair or replace, at our discretion
and at no cost to the purchaser, any component that
is found to be factory defective. This warranty is
limited to the original purchaser of the unit and is
not transferable.
This warranty does not apply to any unit that has been
improperly installed, mishandled, abused or damaged
in a crash or to any unit which has been repaired or
altered by any unauthorized agencies. Under no
circumstances will the buyer be entitled to
consequential or incidental damages. This limited
warranty gives you specific legal rights; you also have
other rights, which may vary from state to state. As
with all fine electronic equipment, do not subject your
radio system to extreme temperatures, humidity or
moisture. Do not leave it in direct sunlight for long
periods of time.
Warranty and Service Information
Note: Be sure to keep your original dated sales
receipt in a safe place, as you will be required to provide proof of purchase date for the equipment
to be serviced under warranty.
5189 JR XR-2i manual 9/18/02 12:01 PM Page 27
28
Repair Service Directions
Warranty Repairs
Normal Non-Warranty Repairs
Ship your system to:
Horizon Service Center
4105 Fieldstone Road
Champaign, IL 61822
Phone: (217) 355-9511
Copyright 2002 Horizon Hobby, Inc.
In the event that your JR radio needs service, please
follow the instructions listed below.
1. Check all on/off switches to be sure they are off.
This will speed the repair process of checking
battery condition.
2. Return your system components only (transmitter,
receiver, servos, etc.). Do not return your system
installed in a model car, boat, etc.
3. Preferably, use the original carton/packaging
(molded foam container) or equivalent to ship your
system. Do not use the system carton itself as a
shipping carton. You should package the system
carton within a sturdy shipping container using
additional packing material to safeguard against
damage during transit. Include complete name
and address information inside the carton, as well
as clearly writing it on the outer label/return
address area.
4. Include detailed information explaining your
operation of the system and problem(s)
encountered. Provide an itemized list of equipment
enclosed and identify any particular area/function,
which may better assist our technicians in
addressing your concerns. Date your
correspondence and be sure your complete name
and address appear on this enclosure.
5. Include you name, mailing address and a phone
number where you can be reached during the
business day.
6. Within your letter, advise us of the payment
method you prefer to use. The Horizon Service
Center accepts only VISA or MasterCard. Please
include your card number and expiration date.
To receive warranty service, you must include your
original dated sales receipt to verify your proof-of-
purchase date. Providing that warranty conditions
have been met, your radio will be repaired
without charge.
Should your repair cost exceed 50% of the retail pur-
chase cost, you will be provided with an estimate
advising you of your options.
4944013 000366
JRPM128
5189 JR XR-2i manual 9/18/02 12:01 PM Page 28