INSTRUCTION MANUAL 2-CHANNEL DIGITAL PROPORTIONAL RADIO CONTROL SYSTEM Congratulations on your purchase of the JR Python 2-channel radio control set which has been manufactured and assembled with the greatest care. We are confident that you will be delighted with your purchase. Please read the instructions thoroughly, noting all points before use, in order to avoid mistakes in handling and operation. I. INTRODUCTION II. COMPONENTS AND SPECIFICATIONS Your JR Python Radio includes the following items:
Transmitter NET-112L 2-Channel Receiver NER-102 2 Servos Z250 x 2 Accessories B.E.C. Switch Harness and Servo Accessories TRANSMITTER SPECIFICATIONS: PYTHON LED Antenna Output 500mW Frequency 27/75 MHz Modulation AM Power Supply 9.6V D/C Dimensions 8.15" x 7.00" x 3.35"
Weight 13 oz RECEIVER SPECIFICATIONS: R102 Intermediate Frequency 455KHz Power Supply 4.8V-8.4V D/C Dimensions 1.93" x 1.50" x 0.827"
Weight 1.3 oz SERVO SPECIFICATIONS: Z250 Torque 49 in/oz. (6V) Speed . 19 sec/60 (6V) Dimensions 0.73" x 1.52" x 1.32"
Weight 1.5 oz BB Bushing Motor 3-Pole Ferrite III. R/C SAFETY PRECAUTIONS For safe and reliable performance of your R/C model, please care-
fully read and follow these guidelines:
1. Radio control models are not toys. They are capable of inflict-
ing 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, or wildlife. Also, watch carefully for fishing lines that can entangle 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 immedi-
ately. Do not operate your model again until you are certain the problem has been corrected. CAUTION: Control of your model is impossible without suffi-
cient 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 B.E.C.), you should discontinue use when the top speed sharply decreases or you will quickly lose control of your model. 1 IV. OPERATING YOUR MODEL It is 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 your R/C model will not operate out of control when you turn off the transmitter. V. INSTALLATION JR PYTHON WITH Z250 SERVOS SERVO FEATURES A tight deadband amplifier ensures accurate neutral centering Low current drain An indirect drive feedback potentiometer gives additional protection from vibration State-of-the-art surface mount technology (SMT) 3-pole ferrite cored motor for reliability Z250 SERVO LAYOUT Servo Arm Retaining Screw Servo Arm/Horn Rubber Grommets Servo Output Shaft Servo Case Servo Lead w/Connector Servo Eyelet Servo Mounting Flange Servo Mounting Flange Rubber Grommets TOP VIEW Your NER-102 Receiver has Battery Eliminator Circuitry (B.E.C.). The receiver gets its power from the models NiCad battery pack, thus saving the weight of an additional receiver battery. NiCad batteries from 6V-8.4V (5-7 cells) can be used safely. Higher volt-
age packs may damage the receiver and servos. 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 battery to power the receiver (such as for some electric boats or in gas-powered vehicles). A NiCad pack plugged into the BATT socket on your receiver will operate your receiver. You may also use alkaline batteries with an optional battery holder (part no. JRPA020). If you use a mechanical speed controller, please ensure that it has the correct connector for a B.E.C. system (red connector). See FIGURE A for a typical setup. Most electronic speed controllers are set up for B.E.C. operation and plug directly into your receiver (Function 2). See FIGURE B for a typical setup and check your speed controllers manual for correct installation. You should use the black rubber servo cushions whenever possi-
ble to decrease your servos sensitivity to vibration. To Resistors To Motor BEC Connector BEC Optional Battery Holder
(JRPA020) FIGURE A Connections to B.E.C. receiver with mechanical speed controler. NiCad battery, speed controller and battery holder are not included in the radio set. To Motor BEC 2 FIGURE B Connections to B.E.C. receiver with electronic speed controler. Ni-Cad battery and speed controller are not included in the radio set. POWER SWITCH SERVO REVERSE SWITCHES The reverse switches allow the rotation of the servos to be reversed. STEERING REVERSING SWITCH THROTTLE REVERSING SWITCH STEERING TRIM Rotate the top trim tab to adjust and obtain the neutral position of the steering servo. HINT: Setting your steering linkage:
1. Make sure your steering rate adjuster (see call-out at right) is set to the maximum position and your steering trim is centered. 2.Turn on the power to your receiver to center the steering servo and set the linkage for maximum travel. Then use the rate adjuster to adjust the amount of travel you need. THROTTLE TRIM Rotate the bottom trim knob to adjust and obtain the neutral position of the throttle servo. CHARGING JACK Your Python trans-
mitter can be upgraded to NiCad batteries using the optional Dynamite DYN1900 NiCad Conversion Kit. JR POLARITY:
(Center pin negative) VI. IDENTIFICATION OF TRANSMITTER PARTS STEERING WHEEL The steering wheel rotates 35 to the left and to the right. 35 35 LED VOLTAGE METER If the meter indicates green, your batteries are approximately full strength. If the meter indicates orange or red, the batteries are weak and need to be replaced with new cells or charged if you are using rechargeable AA NiCads. STEERING RATE ADJUSTER The steering rate adjuster affects the throw of the steering servo. The output can be adjusted from approxi-
mately 10% to 100%. The throw of the servo decreases as you move the dial to the left. HINT: Use this to decrease the sensitivity of your steering on loose courses and on courses without tight curves. 20 20 THROTTLE TRIGGER The throttle trigger moves 20 in the forward and reverse direction. BACK OF TRANSMITTER CRYSTAL
(FACTORY INSTALLED) N O H T Y P BATTERY CASE To remove the battery cover, slide the tab in the direction of the arrow while pushing the rounded tab. Install the 8 AA batteries according to the diagram. If the transmitter voltage fails to register, check for the correct installation of the batteries and make sure the batteries still have a charge. 3 VII. PARTS LISTING VIII. FREQUENCY CHART TX Antenna Servo Grommets (20) Servo Eyelets (20) Servo Mounting Screws (20) Offset Horn w/Screw (2) Large Arm w/Screw (2) Servo Case JRPA159 JRPA225 JRPA233 JRPA226 JRPA210 JRPA212 JRPSCZ250 JRPSGZ250 Servo Gear Set AM Crystal Set JRPXAG**
OPTIONAL PARTS JRPA011 JRPA020 JRPC221 Switch Harness for BEC 4-Cell RX Battery Case TX/RX Charger DYN1900 NiCad Conversion Kit FREQUENCY (MHZ) CHANNEL 26.995........................1 27.045........................2
.095 .......................3
.145 .......................4
.195 .......................5
.255 .......................6 75.410 .....................61
.430 .....................62
.450 .....................63
.470 .....................64
.490 .....................65
.510 .....................66 FREQUENCY (MHZ) CHANNEL 75.530 .....................67
.550 .....................68
.570 .....................69
.590 .....................70
.610 .....................71
.630 .....................72
.650 .....................73
.670 .....................74
.690 .....................75
.710 .....................76
.730 .....................77
.750 .....................78 FREQUENCY (MHZ) CHANNEL 75.770 .....................79
.790 .....................80
.810 .....................81
.830 .....................82
.850 .....................83
.870 .....................84
.890 .....................85
.910 .....................86
.930 .....................87
.950 .....................88
.970 .....................89
.990 .....................90 IX. PYTHON RECEIVER CRYSTAL COMPATIBILITY NER-102 STANDARD RECEIVER R122 OPTIONAL RECEIVER Your Pythons NER-102 receiver has been designed to use only a JR green receiver crystal (JRPXAG** TX/RX crystal set). JR grey receiver crystals (JRPXAR**) are not designed to be used with the NER-102 receiver, and will reduce the usable range of the receiver. JRs optional R122 receiver is designed for use with JR grey receiver crystals only (JRPXAR**). The JR green receiver crystals
(JRPXAG** Tx/Rx crystal set) included with your Python system are not compatible with the R122 receiver and should not be used.
** Replace with channel number when ordering. X. WARRANTY AND SERVICE INFORMATION IMPORTANT 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 365 days from the date of purchase. During this period, Horizon Service Center will repair or replace, at our discretion, any component that is found to be factory defective at no cost to the purchaser. This warranty is limited to the original purchaser of the unit and is not transferable. This warranty does not apply to any unit which 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. JRP2775M.46 4 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. 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. 7. 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. Within your letter, advise us of the payment method you prefer to use VISA or MasterCard. Please include your card number and expiration date. Mail your system to: Horizon Service Center 4105 Fieldstone Road Champaign, IL 61822 Phone: (217) 355-9511 www.horizonhobby.com