3-Channel, 4-Model Memory
FM Computer Racing System
4680 JR XR3i manual 7/17/02 12:14 PM Page 1
2
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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6
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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8
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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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, Frame Rate,
Auxiliary Channel 3 function, Grip button C function, Data
Reset or the Model Copy 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 immediately
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
Aux
0
Auxiliary Channel 3
Function
(page 16)
frm
F
Frame Rate
(page 15)
md !
1
mdl
1
Model Select
(page 14)
20
clr
1
cpy
2
gbc
0
Data Reset
(page 19)
25
Grip Button C
Function
(page 17)
Copy Model Data
(page 20)
26
Accessing the System Mode
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14
The XR3i has memory for four models. This feature allows
for four different models to be operated with the same transmitter (additional receivers and servos must be purchased
separately) or one model with four 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, 2, 3, or 4).
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.
The XR3i allows a three-character name to be input for
each of the four 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). To clear the
character, pressing the Increase and Decrease keys at the
same time.
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 Frame Rate 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.
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, 2, 3, or 4).
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.
md !
1
Character to
be Adjusted
Current Model
Number
mdl
1
Model Select
Fuction
Current Model
Number
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
Model Select
(System Mode)
Model Name Entry
(System Mode)
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15
The Frame Rate function allows you to select one of two
transmitter frame rates available: Normal "N" - the default or
Fast "F". The Normal Frame Rate should be selected if you
are using only non-digital servos. The Fast Frame Rate may
be selected if you are using at least one digital servo.
Note: The Frame Rate function offers quicker
response times in the “F” or Fast mode. Some
types of non-JR servos are not compatible in the
“F” Fast mode and require the radio to be operated
in the “N” Normal mode.
Accessing the Frame Rate 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 "FRM" appears on the screen.
4. Press the Increase or Decrease key to select the desired
frame rate (N or F).
5. Press the Scroll key to access the Auxiliary Channel 3
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.
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
“FRM” appears.
Press the Increase or Decrease key to select the
desired frame rate.
Current
Frame Rate
frm
F
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
Frame Rate Select (System Mode)
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16
The Auxiliary Channel 3 function of the XR3i allows you to
select from two different types of Channel 3 servo travel
movements or to inhibit the Auxiliary Channel 3 function.
Use the information below to select the correct Auxiliary
Channel 3 function type for your particular installation. It is
suggested the 0 function be selected for most applications.
(Factory preset)
00
= The 0 or Inhibit function allows the Brake End-Point
Adjustment function, page 34, to be used. This function
is designed to be used with most types of electric and
gas-powered R/C cars. This feature is extremely popular,
as it allows the amount of panic braking accessible through
the throttle trigger's braking position to be adjusted during
operations for maximum effectiveness. When activated,
the braking values will be visible via the Direct Trim function,
page 30.
LLNN
= The LN or linear servo travel function is designed
to be used when an engine fuel mixture servo is required.
This function is most commonly used with gas-powered
R/C racing boats and is accessible through Grip Dial A. In
this function, the maximum travel of the servo is determined
by the End-Point Adjustment function, page 24. The servo
neutral position can be altered proportionally via the Grip
Dial A for mixture adjustment. When activated, fuel mixture
trim values are visible for the direct trim function, page 35.
22PP
= The 2P or 2 position Servo Travel function is designed
to be used as a transmission gear shift channel. This feature
is designed for use with vehicles such as the Traxxas
®
T-Maxx. This function is accessible through Grip Button C
or Grip Dial A if Grip Button C is occupied by another
function. In this function, the servo's travel values are determined by the End-Point Adjustment function, page 24.
Accessing the Auxiliary
Channel 3 Function
0 = Inhibited (Grip Dial A braking is active)
LN = Linear servo movement
2P = 2-position servo movement
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 "AUX" appears on the screen.
4. Press the Increase or Decrease key to select the correct
Auxiliary Channel 3 function type to be used.
5. Press the Scroll key to access the Grip Button C Select
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.
aux
2P
Auxiliary Channel 3
Function
Non-linear
Two-Position
Movement
(Traxxas shiftable
transmission use)
Press and hold the
Scroll and Channel
keys at the same time
to enter the System
mode. Next Press the
Scroll key until "AUX"
appears.
Press the Increase
or Decrease key to
select the desired
Auxiliary channel
3 function type to
be used.
aux
LN
Auxiliary Channel 3
Function
Linear Movement
(fuel mixture servo)
aux
0
Auxiliary Channel 3
Function
Channel 3 is Inhibited
(Grip Dial A braking
function is now
activated)
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
Auxiliary Channel 3 Function Select (System Mode)
4680 JR XR3i manual 7/17/02 12:14 PM Page 16
17
The Grip Button C function of the XR3i allows you to select
from 3 different functions available. Use the information
below to select the correct Grip Button C assignment for your
particular installation.
"0": Off. (Default) If "AUX " is "2P ", then "2P " replaces"0" in this screen.
"Eb": ESB (Emergency Steering Button.) To cancel the "STG" regulation
for panic steering.
"LA": Lap timer.
Note: If "LA" or "Eb" is selected and "2P" is assigned
to the Auxiliary Channel 3 function, the Auxiliary
Channel 3 function is moved to Grip Dial A.
(Factory preset)
00
= The 0, or off function, is the default setting and does not
assign a function to Grip Button C. If the Auxiliary Channel 3
function is set to "2P" or 2-position, "2P" will appear in this
screen in place of "0" and Grip Button C will function as the
gear select button.
EEBB
= The Eb or Emergency Steering Button function is
designed to override the value of Grip Dial B and provide
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.
{Figure 24-Insert new drawing of Grip Button C and Eb value
Callout GBC -
Callout Eb - Indicates
Emergency Steering Button is
activated}
LLAA
= The LA or Lap-Timer function is designed to be used
when you want to enable the recording of individual lap time.
The Lap-Timer function is described on page 27.
{Figure 24-Insert new drawing of Grip Button C and LA value
Callout GBC - Indicates Grip Button C function
Callout LA - Indicates Lap Timer button is activated}
gbc
LA
Grip Button
Function
Lap-Timer
gbc
0
Grip Button C
Function
Grip Button C is
Inhibited
gbc
EB
Grip Button C
Function
Emergency
Steering Button
is Activated
gbc
LA
Grip Button C
Function
Lap-Timer Button is
Activated
Grip Button C Function Select (System Mode)
4680 JR XR3i manual 7/17/02 12:14 PM Page 17
INCREASE
CLEAR
DECREASE
SCROLL
ENTER
CHANNEL
18
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.
Press and hold the
Scroll and Channel
keys at the same time
to enter the System
Mode. Next Press the
Scroll key until "GBC"
appears.
0 = Inhibited
Eb = Emergency Steering Button
LA = Lap-Timer
Press the Increase or
Decrease key to
select the desired
Grip Button C
function type to
be used.
4680 JR XR3i manual 7/17/02 12:14 PM Page 18
19
The Data Reset function allows you to reset all the programming in the selected model (1, 2, 3 or 4) 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, 2, 3 or 4) 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, 2, 3 or 4) 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
1
Model 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
Data Reset (System Mode)
4680 JR XR3i manual 7/17/02 12:14 PM Page 19
Accessing the Copy Model
Data 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 "CPY" appears on the screen.
4. Press the Increase or Decrease key to select the desired
model number you want the current model data copied to.
This model number being select should be blinking.
5. Press the Increase and Decrease keys at the same time
to copy the current model data into the selected model
number. To confirm that the selected model has been
copied to, a beep will sound and the model number
selected (1, 2, 3 or 4) will stop flashing.
6. To exit the System mode, either turn the transmitter power
switch off or press the Scroll and Channel keys at the
same time.
20
The Copy Model Data function allows you to copy the
current model data into the model memory of the blinking
model selected. Before using the Copy Model Data function,
be sure you know what model number you want to copy the
data to as all data in this selected model will be lost. If the
current model being copied from uses the default name, the
model name from the model being copied to will be retained.
cpy
2
Model being
copied to
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 “CPY” appears.
Press the Increase and Decrease keys at the
same time to copy model data from the current
model to the selected model.
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
Copy Model Data (System Mode)
4680 JR XR3i manual 7/17/02 12:14 PM Page 20
21
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.
Mode Key Channel Key
sts
0
TRIM
aus
0
TRIM
ths
0
TRIM
L/F L/F
R/B
R/B
tdb
0
∞
0
∞
0
∞
stl
st
LN
EXP
thf
LN
EXP
st
100
EPA
MIX
aux
100
EPA
th
100
EPA
thb
MIX
40
20
LAP
st aux
SB-TRM
th
SB-TRM
Throttle
Deadband
(page 22)
Channel Key
Exponential
(page 23)
Channel
Key
Channel
Key
Channel
Key
Channel
Key
Channel
Key
Channel
Key
Channel
Key
Mixing
(page 26)
Lap-Timer
(page 27)
End-Point
Adjustment
(page 24)
Sub-Trim
(page 28)
Servo Reversing
(page 29)
—
REV•NORM
—
REV•NORM
—
REV•NORM
Accessing the Function Mode
4680 JR XR3i manual 7/17/02 12:14 PM Page 21
22
The throttle deadband feature is used to reduce/eliminate the
dead throttle area that exists at neutral to the starting point of
throttle and from neutral to the starting point of braking. This
area is sometime known as deadband. As more throttle trim
(also known as static brake) is applied, more of the dead
trigger area right off neutral exists. To eliminate the throttle
deadband, adjust a forward value such that your vehicle's
wheels just start to turn when the trigger is slightly squeezed.
This provides the most accurate feel and eliminates the dead
area in the throttle. To eliminate the braking deadband,
adjust the brake value such that your vehicle starts to slow
down when the trigger is slightly pushed. This provides
the most accurate brake feel and eliminates the dead area
when braking.
Values: 0% to 100%
Clear = 0%
Accessing the Throttle
Deadband function
1. Turn the transmitter power switch on.
2. Press the Scroll key to access Function mode.
3. Press the Scroll key until "TDB" appears on the screen
4. Move the trigger accordingly to adjust the forward or
braking deadband.
5. Press the Increase or Decrease key to select the desired
value necessary to eliminate dead area.
6. Press the Scroll key to access the Exponential 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.
L/F
tdb
0
∞
0
∞
R/B
tdb
Forward Adjustment
(depends on
trigger position)
Current Value
Brake Adjustment
(depends on
trigger position)
Current Value
Press the Scroll key
until "TDB" appears on
the screen.
Press the Increase or Decrease key to select the
desired value necessary.
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
Throttle Deadband (Function Mode)
4680 JR XR3i manual 7/17/02 12:14 PM Page 22
23
The Exponential feature of the XR3i allows you to alter
the response rate of the steering or throttle control around
neutral without affecting the maximum amount of steering
or throttle available. The adjustment range is from -100% to
0% (Linear) to +100%. Exponential is factory set to linear for
both steering and throttle. Exponential is often used to settle
down a car that is twitchy around center without giving up
maximum steering response. The XR3i provides both positive (increase sensitivity at neutral) and negative (decrease
sensitivity at neutral) exponential values.
Accessing the Exponential function
1. Turn the transmitter power switch on.
2. Press the Scroll key to access the Function mode.
3. Press the Scroll key until "EXP" appears in small letters
on the left side of the screen.
4. Press the Increase or Decrease keys to select the desired
exponential value.
5. Press the Scroll key to access the travel End-Point
Adjustment function
6. To exit the Function mode, either turn off the transmitter
power switch or press the Scroll and Channel keys at the
same time.
st
ln
EXP
Steering Exponential
Adjustment
Current Value
thf
ln
EXP
Forward Throttle Exponential
Adjustment
Current Value
thb
ln
EXP
Braking Exponential
Adjustment
Current Value
Press the Scroll key
until "EXP" appears on
the screen.
Press the Increase and Decrease keys to select
the desired exponential value.
Values: -100% to Linear (LN) to +100%.
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
Exponential (Function Mode)
4680 JR XR3i manual 7/17/02 12:14 PM Page 23
24
The End-Point Adjustment feature of the XR3i allows the
maximum travel of both the steering, throttle and Auxiliary
Channel 3 (optional) 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
L/F
aux
100
EPA
R/B
aux
100
EPA
R/B
st
100
EPA
L/F
th
100
EPA
R/B
th
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
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
Left/Right Travel
Adjustment (function LN)
or Forward Travel
Adjustment
(function 2P) accessible
through Grip Button C
Functions
LLNN& 22PP
Functions
22PP
only
Current Value
Values: 0 to 190
Clear = 100
Rearward Travel Adjustment
(function 2P) accessible
through Grip Button C
Current Value
Values: 0 to 190
Clear = 100
Channel 3 Screens
(Optional)
End-Point Adjustment (Function Mode)
4680 JR XR3i manual 7/17/02 12:14 PM Page 24
25
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)
Auxiliary Channel 3 (optional) = AUX L/F or AUX R/B
(function 2P only)
5. Move the steering wheel, trigger or Grip Button C 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, trigger or
Grip Button C in the opposite direction to adjust the travel
in the opposite direction.
Note: For Auxiliary Channel 3 function, if LN is
selected, only L/F is adjustable.
6. Press the Scroll key to access the Mixing Adjustment
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.
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
4680 JR XR3i manual 7/17/02 12:14 PM Page 25
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
26
The XR3i offers two different mixing adjustments that allows
for mixing one channel to another channel. The mixes
available are Steering-to-Auxiliary Channel Mixing and
Throttle-to-Auxiliary Channel Mixing. Each direction is
independently adjustable. Popular use of this function
includes 4-wheel steering and independent front and rear
wheel brakes.
For example, Throttle-to-Auxiliary channel mixing can be
used for independent front and rear wheel brakes. Each time
the throttle/brakes is moved, the auxiliary channel will move
in the direction and to the value input being given by the
throttle channel. Mixing is proportional, so small inputs to
the throttle will result in small output from the auxiliary
channel. The adjustment range is from -125% to 0% to
125%. If the rate is negative, the channel is mixed in the
opposite direction.
Both mixes share a single mixing "offset." The purpose of
the mixing offset is to redefine the neutral position of the
auxiliary channel, which can be set using Grip Lever A when
"LN" is selected in the Auxiliary Channel 3 function. If the
"LN" selection is turned off in the Auxiliary Channel 3
function with a offset value currently present, the value will
continue to act as a mixing offset until the value is either
cleared or changed. If a mix is not required, it is strongly
suggested the mixing rate be set for 0%, which is the default.
Accessing The Mixing
Adjustment Function
1. Turn on the transmitter power switch.
2. Press the Scroll key to enter Function mode.
3. Press the Scroll key until "MIX" appears in the screen.
4. Press the Channel key to select the desired mix to
be used.
STR or STL = Steering-to-Auxiliary Channel 3 Mixing.
THF or THB = Throttle-to-Auxiliary Channel 3 Mixing.
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 mixing. Move the wheel or trigger in the
opposite direction to adjust the mixing in the opposite
direction.
6. Press the Scroll key to access the Lap-Timer function
(if enabled) or 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.
Steering-to-Auxiliary
Channel Mixing
Adjustment
Throttle-to-Auxiliary
Channel Mixing
Adjustment
—
stl
MIX
thb
MIX
Press the Scroll key
until "MIX" appears on
the screen.
Press the Channel
key to select the
desired mix.
Move the wheel or trigger in the desired direction
and press either the Increase or Decrease keys to
achieve the desired mixing value.
10
∞
10
∞
Programmable Mixing (Function Mode)
4680 JR XR3i manual 7/17/02 12:14 PM Page 26
27
The Lap-Timer function of the XR3i allows the recording of
individual lap times based on a 999 second up-timer. Up to
50 laps and times from 3.0 to 99.9 seconds can be stored in
memory for review at a later time. The Lap-Timer function
will only be enabled and shown in Function mode if Grip
Button C (System Mode) is set to "LA." With the Lap-Timer
enabled, pressing the channel key will alternate between the
Normal display screen and Up-Timer display screen.
The Lap-Timer is started by pressing Grip Button C. Once
active, as shown by the blinking word "LAP," pressing Grip
Button C again will begin recording the time of the next lap.
Note: A 3.0 second lap is the quickest lap allowed.
This prevents accidental double pushing of Grip Button
C when recording lap times. If more than 50 laps are
recorded, each new lap will overwrite the oldest lap
held in memory.)
To stop the Lap-Timer, press the Increase and Decrease keys
at the same time. To restart the Lap-Timer, press Grip Button
C. To reset the Up-Timer, press the Channel key to show the
Up-Timer display screen. With the Up-Timer stopped, press
the Increase and Decrease keys at the same time to reset.
To review or reset lap times you must be in the Lap-Timer
function mode screen. Upon entering this function, the
screen will always show the last lap time recorded. Use the
Increase or Decrease keys to view the desired lap(s).
Note: If a recorded lap time is greater than
99.9 seconds, "OVR" will be displayed.)
To reset all lap times, press the Increase and Decrease keys
at the same time.
Accessing The Lap-Timer Function
1. Turn on the transmitter power switch.
2. Press the Scroll key to enter Function mode.
3. Press the Scroll key until "LAP" appears in the screen.
4. Press the Increase or Decrease keys to view the desired
lap time(s).
5. To reset all lap times press the Increase and Decrease
keys at the same time.
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.
Press the Scroll key
until "LAP" appears on
the screen.
Press the Increase or Decrease keys
to view the desired lap time(s).
401
20
LAP
Recorded Lap
Time to 1/10th of
a second
(i.e. 40.1 sec.)
Current
Lap Number
—
A minus sign indicates a pre-existing lap. Current lap times have no sign.
SCROLL
ENTER
CHANNEL
INCREASE
CLEAR
DECREASE
Lap-Timer (Function Mode)
4680 JR XR3i manual 7/17/02 12:14 PM Page 27
28
The Sub-Trim function of the XR3i is an electronic trimming
feature that allows the neutral position of the servo on either
the steering, throttle or auxiliary channel (optional) to be
moved, while allowing the electronic trim lever for that
channel to remain in the center position. This feature 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
Sub-Trim (Function Mode)
4680 JR XR3i manual 7/17/02 12:14 PM Page 28
29
The Servo Reversing feature of the XR3i is a very convenient
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, throttle
and Auxiliary Channel 3 of the XR3i.
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, AUX = Auxiliary Channel 3).
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
Servo Reversing (Function Mode)
4680 JR XR3i manual 7/17/02 12:14 PM Page 29
30
The Direct Mode function of the XR3i 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.
stc
0
thc
0
aux
0
brk
50
EPA
stg
70
∞
RATE
Steering Trim
(page 31)
Only present when Aux. function “O” is selected
Only present when Auxiliary function “LN” is selected
Throttle Trim
(page 32)
Steering Dual-Rate
(Grip Lever B)
(page 33)
Brake Travel Adjustment
(Grip Lever A),
(page 34)
(Only visible when the
Auxiliary Channel 3
function “O” has been
selected.) Refer to
Auxiliary Channel 3
function, page 16, for
clarification.
Auxiliary Channel 3
Trim Adjustment
(LN mode only)
Refer to Auxiliary
Channel 3 function,
page 35, for
clarification.
*Note: When Auxiliary Channel 3 function 2P is
selected, the two screens above are not present.
*
*
TRIM
TRIM
R/B
Accessing the Direct Trim Mode
4680 JR XR3i manual 7/17/02 12:14 PM Page 30
31
The XR3i 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 override/alter the end-point value.)
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.
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.
TRIM.
Values: L/F 30 0 R/B 30
stc
0
Steering Trim
Screen
Current Value
Press the Increase and Decrease keys at the
same time to reset the steering trim to zero.
Steering Trim Location
Right Trim Left Trim
INCREASE
CLEAR
DECREASE
Steering Trim
Steering Trim (STC)
4680 JR XR3i manual 7/17/02 12:14 PM Page 31
ST.
32
The XR3i's electronic Throttle Trim lever, located to the left
of the steering wheel, allows the center position 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 24) 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.
TRIM.
Values: L/F 60 0 R/B 60
stc
0
Current 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
Throttle Trim (THC)
4680 JR XR3i manual 7/17/02 12:14 PM Page 32
ST.
INCREASE
CLEAR
DECREASE
33
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 17) is
active, pressing Grip Button C will restore the steering dual
rate to 100% until the button is released.
To adjust the Steering Dual-Rate value, move the electronic
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.
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
Grip Lever B: Steering Dual-Rate Trim Adjustment (STG)
4680 JR XR3i manual 7/17/02 12:14 PM Page 33
34
Brake End-Point Adjustment
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.
Note: If Grip Lever A is assigned an Auxiliary
Channel 3 function by selecting "LN" or "2P"
with Grip Button C in use, the Brake End-Point
Adjustment will not be available.
To adjust the brake endpoint 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
Grip Lever A: Brake End-Point Adjustment BRK/Auxiliary
Channel 3 Access
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35
When selected, Grip Lever A can be used to access the
Auxiliary Channel 3 function of the XR3i for use as a fuel
mixture channel.
When the LN (linear) Auxiliary Channel 3 function is
selected, Grip Lever A can be used to change the neutral
position of the servo to lean or richen the engine's fuel
mixture. Once the desired fuel mixture has been achieved,
the Grip Lever A value indicated on this screen can be
transferred manually to the Sub-Trim function (page 28) and
the value of the AUX screen can be returned to zero. Please
refer to diagram A to the right for proper grip lever operation.
Auxiliary Channel 3 Access
(Transmission Shift Selector)
When the 2P Auxiliary Channel function is selected, the Grip
Lever A can be used to move the Auxiliary 3 Channel servo
to one of two positions (left/right or forward/reverse) when
LA or Eb is selected for the Grip Button C function. Please
refer to diagram A below for proper shifting procedures.
Note: The End-Point Adjustment function
(page 24) is used to set the forward and reverse
gear servo travel positions.
aux
0
Auxiliary Channel 3 Fuel Mixture Control (LN selected)
Current Value
Forward Gear Reverse Gear
(Transmission Use)
(Fuel Mixture Use)
Decrease
Increase
Grip Lever A
Brake Trim
Auxiliary Channel 3 Access
(Fuel Mixture)
Diagram A
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36
STEERING THROTTLE AUX
THROTTLE DEADBAND F__________% B__________%
EXPONENTIAL __________% F__________% B__________%
END-POINT ADJUSTMENT L__________ R__________ F__________ B__________ L__________ R__________
MIXING L__________% R__________% F__________% B__________%
SUB-TRIM
SERVO REVERSING REV/NORM REV/NORM REV/NORM
Function Mode
MODEL NUMBER 1 2 3 4
MODEL NAME
FRAME RATE N/F
AUX FUNCTION O/2P/LN
GRIP BUTTON C O/Eb/LA
System Mode
TRIM STEERING THROTTLE AUX. CHANNEL 3
VALUES –/+ –/+ –/+
GRIP LEVER B
STEERING D/R %
BRAKE EPA AUX FUNCTION “LN”
GRIP
LEVER A VALUES %
Direct Mode
STEERING THROTTLE AUX
THROTTLE DEADBAND F__________% B__________%
EXPONENTIAL __________% F__________% B__________%
END-POINT ADJUSTMENT L__________ R__________ F__________ B__________ L__________ R__________
MIXING L__________% R__________% F__________% B__________%
SUB-TRIM
SERVO REVERSING REV/NORM REV/NORM REV/NORM
Function Mode
MODEL NUMBER 1 2 3 4
MODEL NAME
FRAME RATE N/F
AUX FUNCTION O/2P/LN
GRIP BUTTON C O/Eb/LA
System Mode
TRIM STEERING THROTTLE AUX. CHANNEL 3
VALUES –/+ –/+ –/+
GRIP LEVER B
STEERING D/R %
BRAKE EPA AUX FUNCTION “LN”
GRIP
LEVER A VALUES %
Direct Mode
XR3i Data Sheet
4680 JR XR3i manual 7/17/02 12:14 PM Page 36
37
STEERING THROTTLE AUX
THROTTLE DEADBAND F__________% B__________%
EXPONENTIAL __________% F__________% B__________%
END-POINT ADJUSTMENT L__________ R__________ F__________ B__________ L__________ R__________
MIXING L__________% R__________% F__________% B__________%
SUB-TRIM
SERVO REVERSING REV/NORM REV/NORM REV/NORM
Function Mode
MODEL NUMBER 1 2 3 4
MODEL NAME
FRAME RATE N/F
AUX FUNCTION O/2P/LN
GRIP BUTTON C O/Eb/LA
System Mode
TRIM STEERING THROTTLE AUX. CHANNEL 3
VALUES –/+ –/+ –/+
GRIP LEVER B
STEERING D/R %
BRAKE EPA AUX FUNCTION “LN”
GRIP
LEVER A VALUES %
Direct Mode
STEERING THROTTLE AUX
THROTTLE DEADBAND F__________% B__________%
EXPONENTIAL __________% F__________% B__________%
END-POINT ADJUSTMENT L__________ R__________ F__________ B__________ L__________ R__________
MIXING L__________% R__________% F__________% B__________%
SUB-TRIM
SERVO REVERSING REV/NORM REV/NORM REV/NORM
Function Mode
MODEL NUMBER 1 2 3 4
MODEL NAME
FRAME RATE N/F
AUX FUNCTION O/2P/LN
GRIP BUTTON C O/Eb/LA
System Mode
TRIM STEERING THROTTLE AUX. CHANNEL 3
VALUES –/+ –/+ –/+
GRIP LEVER B
STEERING D/R %
BRAKE EPA AUX FUNCTION “LN”
GRIP
LEVER A VALUES %
Direct Mode
XR3i Data Sheet
4680 JR XR3i manual 7/17/02 12:14 PM Page 37
38
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
FREQUENCY CHART
Frequency Chart
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.
Transmitter Crystal Replacement Notice
4680 JR XR3i manual 7/17/02 12:14 PM Page 38
39
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.
Warranty Repairs
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.
Normal Non-Warranty Repairs
Should your repair cost exceed 50% of the retail purchase
cost, you will be provided with an estimate advising you of
your options.
Ship your system to:
Horizon Service Center
4105 Fieldstone Road
Champaign, IL 61822
Phone: (217) 355-9511
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.
Warranty Coverage
Your new JR Remote Control Radio System is warranted
to the original purchaser against manufacturer 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.
Repair Service Directions
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.
Warranty and Service Information
4680 JR XR3i manual 7/17/02 12:14 PM Page 39
JRPM127
©
Copyright 2002 Horizon Hobby, Inc.
4680
4 944013 0012 71
4680 JR XR3i manual 7/17/02 12:14 PM Page 40
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