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Elenco Electronics RCC-7K Instruction & Assembly Manual
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Elenco Electronics RCC-7K Instruction & Assembly Manual

Elenco Electronics RCC-7K Instruction & Assembly Manual

Radio controlled car kit
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RADIO CONTROLLED CAR KIT
MODEL RCC-7K
Instruction & Assembly Manual
Elenco
®
Electronics, Inc.
Copyright © 2005, 2001 by Elenco
®
Electronics, Inc. All rights reserved.
Revised 2005
REV-I
753288-I
No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.

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Summary of Contents for Elenco Electronics RCC-7K

  • Page 1 RADIO CONTROLLED CAR KIT MODEL RCC-7K Instruction & Assembly Manual Elenco ® Electronics, Inc. Copyright © 2005, 2001 by Elenco ® Electronics, Inc. All rights reserved. Revised 2005 REV-I 753288-I No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.

  • Page 2: Parts List

    PARTS LIST Contact Elenco ® Electronics if any parts are missing or damaged. DO NOT contact your place of purchase as they will not be able to help you. Qty. Symbol R12, R17, R18, R19, R20 R1, R21 R13, R14 R15, R16 R4, R8 R2, R3...
  • Page 3 Qty. Description Screws 0.4” x 0.1” (10mm x 2.6mm) Screws 0.3” x 0.1” (8mm x 2.6mm), 0.15” head Screws 0.3” x 0.1” (8mm x 2.6mm), 0.2” head BAG 4 - HARDWARE Qty. Description Rear Springs Front Spring Shock Absorber Springs Rear Rod 0.8”...

  • Page 4: Theory Of Operation

    The frequency of 27.9MHz was selected for RCC-7K with the approval of the FCC (the US government) to minimize radio interference between this product and all other electrical products.
  • Page 5 Take a closer look at the receiver schematic. The sub-circuit centered around transistor Q1 filters the antenna output, if an RCC-7K transmitter is operating nearby then the 27.9MHz burst signal may be visible at its collector. Inductor L1 is tuned so that the circuit amplifies around 27.9MHz while rejecting all other frequencies.
  • Page 6 Introduction Assembly of your RCC-7K R/C Car Kit will prove to be an exciting project and give you much satisfaction and personal achievement. If you have experience in soldering and wiring techniques, then you should have no problem with the assembly of this kit. Care must be given to identifying the proper components and in good soldering habits.
  • Page 7 THE ORDER SHOWN IN THE PARTS LIST SECTION OR IN THE ASSEMBLY PROCEDURE. When you are ready to assemble the car kit, follow the procedure shown. For an example refer to page 16. The first resistor called for is R13, 1kΩ resistor (brown- black-red-gold).

  • Page 8: Assembly Instructions

    ASSEMBLY INSTRUCTIONS Inspection of Parts: Take a look at each of the parts bags and compare to the Parts List (on pages 1 & 2). Be sure that nothing was damaged during shipment and handling. Contact Elenco have any problems (phone number is on the back of this manual). 9V Battery Slot (Alkaline recommended) Battery Contact,...
  • Page 9 NOTE: If you have a problem putting the gear on the shaft of the motor, then gently tap the gear on with a hard object. Quick Test: Connect a 1.5V battery across the motor wires with your hands. The motor should spin.
  • Page 10 NOTE: The next 3 steps will be much easier if you elevate the car about 1” using a small object. Rear Wheels Locators Gear for rear axle: slide on until it is firmly “grips” on the axle Note: method illustrated above to slide the gear onto the rear axle.
  • Page 11 NOTE: Put some Vaseline or grease into the slots for the rod and some on the teeth of all the gears (motor gear, middle gear, and the rear axle gear). This will make the car go faster. Rear Rod Check the alignment of the gears.
  • Page 12 Quick Test: Lift the wheels off the ground so they may spin freely. Connect a 1.5V battery across the motor wires with your hands, (+) terminal to green wire. The wheels should spin forward slowly but smoothly. Reverse the wires to the battery and the wheels should spin backwards.
  • Page 13 Spring for Steering Centering Steering Alignment front Adjustment of car (triangular piece will lean against this) After inserting wire on it, melt the top of this post with a soldering iron to keep the spring in place. Turning Posts for front wheels Front Wheel...
  • Page 14 You cannot get good connections soldering to the motor shell unless you first file or scrape away a small area of the outer coating. Screw Used (shown actual size) 0.3” x 0.1”, 0.15” head NOTE: The next 3 steps will be much easier if you elevate the car about 1”...
  • Page 15 Front Spring Front Wheel Shock Absorbers Post -14-...
  • Page 16 0.3” x 0.1”, 0.15” head Screw Used Screws (shown actual size) 0.3” x 0.1”, 0.15” head Front Wheels Section Cover Quick Test: Install 4 fresh AA alkaline batteries in the battery cage, observing their polarity while doing so. Lift the front wheels off the ground so they may spin freely.
  • Page 17 ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD Review the soldering and parts identification instructions on p.5 at this time. In all of the following steps the components must be installed on the top legend side of the PC board. The board is turned over to solder the component leads.
  • Page 18 (see Figure E) R21 - 560Ω 5% 1/4W Res. (green-blue-brown-gold) R10 - 2.7kΩ 5% 1/4W Res. (red-violet-red-gold) R4 - 3.3kΩ 5% 1/4W Res. (orange-orange-red-gold) R3 - 22kΩ 5% 1/4W Res. R2 - 22kΩ 5% 1/4W Res. (red-red-orange-gold) R1 - 560Ω 5% 1/4W Res. (green-blue-brown-gold) R5 - 200Ω...
  • Page 19 (see Figure F) C1 - 10pF (10) Capacitor C10 - 0.01µF (103) Capacitor C2 - 27pF (27) Capacitor C3 - 27pF (27) Capacitor C7 - 0.1µF (104) Capacitor C8 - 500pF (501) Capacitor C4 - 3,300pF (332) Capacitor C9 - 0.01µF (103) Capacitor C11 - 2,200pF (222) Capacitor Figure F Mount the ceramic or mylar...
  • Page 20 Figure H Mount the transistor with the flat side in the same direction marked on the PC board. Inspection: Double check that you have installed all of your parts in the proper places. Be sure they are not touching each other and creating short circuits.

  • Page 21: Transmitter Testing

    TRANSMITTER TESTING If you have an oscilloscope then you may test the remote control transmitter for basic operation. Set the scope for 1V/div vertical scale and 1ms/div horizontal scale. Install a 9V battery in the transmitter if you haven’t already done so. Connect your scope probe to the transmitter antenna (leave the probe ground unconnected), turn on the transmitter, and push the left transmitter lever.
  • Page 22 INTERCONNECTIONS & TESTING Wire Solder the red wire from the ON/OFF switch to this solder pad. BE CAREFUL TO AVOID TOUCHING NEARBY PADS! Ground Wire Solder the black wire from the battery contact to this solder pad. BE CAREFUL TO AVOID TOUCHING NEARBY PADS! Resistance Tests Remove one or all of the “AA”...
  • Page 23 Battery Tests Install 4 fresh AA alkaline (or rechargeable nickel- cadmium) batteries in the battery cage, observing their polarity while doing so. Caution: Do not mix alkaline, standard (carbon-zinc), or rechargeable (nickel- cadmium) batteries. Snap in the battery cover to close it. Battery Voltage: Using a multimeter set to DC volts, measure between the front-left and front-right battery contacts.
  • Page 24 Steering Voltage Tests Activate the transmitter for left/right while measuring the voltage at pins 6 & 7 on the SCRX2BC IC. (Note: on some models the steering lever only works if you are also pressing the forwards/backwards lever). Notes: You may need to touch the antenna on the remote control unit to the antenna solder pad (next to C1), since the car’s antenna is not attached yet.
  • Page 25 Driving Motor Tests Solder the yellow wire from the driving motor AND one of the wires from the light bulb to the Q6-Q8 junction on the PCB. BE CAREFUL TO AVOID ALSO TOUCHING NEARBY PADS.. Solder the green wire from the driving motor AND the other wire from the light bulb to the Q5-Q7 junction on the PCB.
  • Page 26 Light Bulb Cover NOTE: Tape the light bulb wires to the inside of the top frame so that the light bulb stays Light Bulb above it. Top Frame Screw Used (shown actual size) 0.3” x 0.1”, 0.2” head 0.3” x 0.1”, 0.2” head Screw -25-...
  • Page 27 Receiver Alignment (highly recommended) Although tunable inductor L1 has been pre-aligned, you may adjust it for optimum performance. You need a very small screwdriver for this. The Car Antenna must be screwed together with the PCB and bottom frame as shown below, to make a good connection.
  • Page 28 Decorative Decals: Place these on now, using your RCC-7K box as a guide. Note that some models may not use all of the stickers provided. Steering Alignment: Your car is ready for use. If it does not go straight when you release the right control lever, then adjust the steering alignment on the bottom front of the car until it works properly.
  • Page 29 NOTE: The light bulb in the car comes on only when the car is moving forwards or backwards. The RCC-7K operates best on a wood or tile floor or in your driveway. Never operate the car in the street. • Never drive your car in rain, snow, mud, sand, dirt, or on a wet floor, as damage may result.

  • Page 30: Troubleshooting Guide

    • Nearby CB and amateur radio transmitters can interfere with your control of the RCC-7K. Try moving away • Re-tune inductor T1 as per the Receiver Alignment on page 26.
  • Page 31 • Be sure all the car batteries are strong and all your wires make strong connections. Symptom: Car does not go forwards/backwards or does so erratically. • Make sure the wheels are all free of thread, lint, or hair and that the black rubber on the wheels is not •...

  • Page 32: Transmitter Schematic

    SCHEMATICS AND BLOCK DIAGRAM TRANSMITTER SCHEMATIC R T1 V RECEIVER SCHEMATIC (1.1V) 10pF (1.1V) (1.8V) (0.8V) (0.25V) (1.7V) (0.25V) (1.7V) RECEIVER CIRCUIT (VOLTAGES ARE FOR DC IN IDLE MODE) PC V SCTX2BC TB ENC (3.0V) (3.1V) (6V) (1.8V) V1 V SCRX2BC V4 VSS DI STEERING CIRCUIT...

  • Page 33: Block Diagram

    27.9 MHz Signal Encoding Circuitry Pulse Sequence, length depends on which command is being sent YELLOW Driving ON/OFF Motor GREEN SCTX2BC PIN DESCRIPTION NAME DESCRIPTION RIGHT STEERING FUNCTION TEST USE ONLY NEGATIVE POWER SUPPLY BACKWARD FUNCTION FORWARD FUNCTION DO NOT USE ENCODING SIGNAL (NO CARRIER) ENCODING SIGNAL (WITH CARRIER) POSITIVE POWER SUPPLY...
  • Page 34 D - not possible, the obstacle blocks radio reception completely. 5. If the batteries in the RCC-7K are weak, the main effects you will notice are ..A - reduced remote control range and reduced power to the motor.
  • Page 35 Requires two (2) “C” size batteries. 49MHz Conversion Kit for RCC-7K R/C Car Kit Model RCC7K49 This kit lets you modify the RCC-7K remote control transmitter and receiver circuits to operate at 49MHz instead of 27MHz, so that two cars may be used at the same time without interfering with each other.
  • Page 36 Elenco ® Electronics, Inc. 150 Carpenter Avenue Wheeling, IL 60090 (847) 541-3800 Fax: (847) 520-0085 Website: www.elenco.com E-mail: elenco@elenco.com...