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XF421EX MANUAL • Table of Contents
I. INTRODUCTION
1. Using This Manual 4
2. Features 4
2.1 Transmitter Features 4
2.2 Receiver Features 4
2.3 Servo Features 5
2.4 Servo Layout 5
3. Specifications 6
3.1 System Specifications 6
3.2 Transmitter Specifications 6
3.3 Servo Specifications 6
3.4 Receiver Specifications 7
3.5 Charger Specifications 7
3.6 Airborne Battery Pack 7
4. Battery Charging 8
4.1 Transmitter/Receiver 8
4.2 Charger 8
5. Trainer System 9
II. XF421EX MANUAL
1. Transmitter Controls 10
1.1 Control Identification and Location 10
1.2
Receiver Channel Assignment/
Transmitter Throttle ALT
10
1.3 Transmitter Rear 11
1.4 Control Stick Length Adjustment 11
1.5 Direct Servo Control (DSC) 12
1.6 Neck Strap Attachment 12
2. Connections 13
2.1 Installation Requirements 13
2.2 Connections 13
3. Key Input and Display 14
4. Battery Alarm and Display 14
5. Input Mode and Functions 15
5.1 Normal Display 15
5.2 Mode Types 15
5.3 System Mode 16
5.4 Function Mode 16
6. Functions (System Mode) 17
6.1 Data Reset 17
6.2 Model Selection 18
6.3 Wing Type Selection 19
6.4 Model Name Entry 21
7. Functions (Function Mode) 22
7.1 Servo Reversing 22
7.2 Sub-Trim 23
7.3 Travel Adjustment 24
8. Data Sheet 25
III. IMPORTANT INFORMATION
1. General Notes 26
2. Daily Flight Checks 26
3. Warranty Coverage 27
4. Repair Service Instructions 27
5. Frequency Chart 28
TABLE OF CONTENTS
We strongly encourage all prospective and current R/C
aircraft pilots to join the Academy of Model Aeronautics.
The AMA is a non-profit organization that provides
services to model aircraft pilots. As an AMA member you
will receive a monthly magazine entitled Model Aviation, as
well as a liability insurance plan to cover against possible
accident or injury. All AMA charter aircraft clubs require
individuals to hold a current AMA membership prior to
operation of their models. For further information you can
contact the AMA at:
Academy of Model Aeronautics
5151 East Memorial Drive
Muncie, IN 47302
(317) 287-1256
Thank you for purchasing the JR XF421EX 5-Channel Radio
System. This unit has been designed to provide the
modeler with a high quality, user friendly radio system
that can be depended upon for years to come.
It’s important that you carefully read this manual before
attempting to operate your system. Please pay particular
attention to Page 9, Introduction 4.2 Charging Your
XF421EX Radio System.
AMA INFORMATION
INTRODUCTION TO THE XF421EX RADIO SYSTEM
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