Horizon Hobby XR2I User Manual

XR2i

2-Channel, 2-Model Memory
AM Computer Racing System

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Table of Contents

Introduction . . . . . . . . . . . . . . . . . . . . .

XR2i Quick Start Setup . . . . . . . . . . .

Direct Trim Access . . . . . . . . . . . . . .

Servo Trim Adjustment . . . . . . . . .

System Features . . . . . . . . . . . . . . . . .

Transmitter . . . . . . . . . . . . . . . . . . .

Receiver . . . . . . . . . . . . . . . . . . . . . .

Servos . . . . . . . . . . . . . . . . . . . . . . .

System Specifications . . . . . . . . . . .

Components . . . . . . . . . . . . . . . . . .

Transmitter . . . . . . . . . . . . . . . . . . .

Receiver . . . . . . . . . . . . . . . . . . . . . .

Servos . . . . . . . . . . . . . . . . . . . . . . .

Control Identification

and Location . . . . . . . . . . . . . . . . . . . .

R/C Safety Precautions . . . . . . . . . . .

Steering Tension Adjustment . . . . .

Charging Jack . . . . . . . . . . . . . . . . . .

Receiver/Servo Connections

and Installation . . . . . . . . . . . . . . . . .

Operating Your Model . . . . . . . . . .

Servo Layout . . . . . . . . . . . . . . . . . .

Key Input and Display . . . . . . . . . . .

Display Screens . . . . . . . . . . . . . . . .

Normal Display . . . . . . . . . . . . . .

Low-Battery . . . . . . . . . . . . . . . . .

Lithium Battery . . . . . . . . . . . . . . .

Memory Backup . . . . . . . . . . . . .

Accessing the System Mode . . . .

Model Select . . . . . . . . . . . . . . . .

Model Name Entry . . . . . . . . . . .

Grip Button C Function Select

Data Reset . . . . . . . . . . . . . . . . . . .

Accessing the Function Mode . . .

End-Point Adjustment . . . . . . . .

Sub-Trim . . . . . . . . . . . . . . . . . . .

Servo Reversing . . . . . . . . . . . . .

Accessing the Direct Trim Mode

Steering Trim . . . . . . . . . . . . . . . .

Throttle Trim . . . . . . . . . . . . . . . . .

Grip Lever B: Steering Dual-Rate

Trim Adjustment STG . . . . . . . . .

Grip Lever A: Brake Endpoint

Adjustment BRK . . . . . . . . . . . . .

XR2i Data Sheets . . . . . . . . . . . . . . .

Frequency Chart . . . . . . . . . . . . . . .

Warranty and Service Information

Introduction

Thank you for purchasing the XR2i 2-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. 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 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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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

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.

End-Point (Travel) Adjustment

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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Direct Trim Access

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.

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System Features

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 endpoint 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

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System Specifications

Components

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

XR2i Transmitter

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)

R-125 Receiver

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

Z270 Servo

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

Z590M Servo

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

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Control Identification and Location

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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.

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R/C Safety Precautions

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 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 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.