Elenco Electronics XK-700-SEMI Assembly And Instruction Manual
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Elenco Electronics XK-700-SEMI Assembly And Instruction Manual

Elenco Electronics XK-700-SEMI Assembly And Instruction Manual

Digital / analog trainer a complete mini-lab for building, testing and prototyping analog and digital circuits
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DIGITAL / ANALOG TRAINER
MODEL XK-700-SEMI
A COMPLETE MINI-LAB FOR BUILDING, TESTING
AND PROTOTYPING ANALOG AND DIGITAL CIRCUITS
Assembly & Instruction Manual
Elenco Electronics, Inc.
Copyright © 1997 Elenco Electronics, Inc.
REV-C
Revised 2001
753045

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Summary of Contents for Elenco Electronics XK-700-SEMI

  • Page 1 DIGITAL / ANALOG TRAINER MODEL XK-700-SEMI A COMPLETE MINI-LAB FOR BUILDING, TESTING AND PROTOTYPING ANALOG AND DIGITAL CIRCUITS Assembly & Instruction Manual Elenco Electronics, Inc. Copyright © 1997 Elenco Electronics, Inc. REV-C Revised 2001 753045...

  • Page 2: Power Supply Specifications

    Digital Section. POWER SUPPLY The XK-700-SEMI has five built-in power supplies which will satisfy most design needs. This includes two variable power supplies giving up to +20 volts and -20 volts at .5 amp. Below 15V, the current available is 1 amp.
  • Page 3 XK-700-SEMI DIGITAL/ANALOG TRAINER PARTS LIST DESCRIPTION LM317 Integrated Circuit (U1) LM337 Integrated Circuit (U5) LM7805 Integrated Circuit (U3) LM7812 Integrated Circuit (U2) LM7912 Integrated Circuit (U4) Transformer Fuse 1.25A Switch Illuminated Bracket L 4-40 tap Panel Top Panel Side Left...

  • Page 4: Parts Verification

    PARTS VERIFICATION Before beginning the assembly process, first familiarize yourself with the components and this instruction book. Verify that all parts are present. This is done best by checking off each item in the parts list. RESISTORS Trim Pot IDENTIFYING CAPACITOR VALUES Capacitors will be identified by their capacitance value in pF (picofarads), nF (nanofarads), or F (microfarads).
  • Page 5 Introduction Assembly of your XK-700-SEMI Digital/Analog Trainer 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 6 INSTALL COMPONENTS TO PC BOARD Install the four L-brackets in the positions shown in Figure A. Mount them into position as shown in Figure B. Place the top panel onto the PC board and align the components with the holes in the top panel. Figure A Note: One side of the bracket is longer.

  • Page 7: Mounting The Pc Board

    MOUNTING THE PC BOARD Note: The holes in the two side panels have been punched differently. Be sure that you have the correct side panel when mounting them to the PC board. Mount the back panel using four 4-40 x 1/4” thread cutting screws (see Figure C). 4-40 x 1/4”...
  • Page 8 Place the top panel on top of the unit. Push the PC board up until the components come through the top panel and tighten the screws. MOUNT COMPONENTS TO THE SIDE PANELS Mount U1, U3 and U5 to the left side panel as shown in Figure G. Insert the pins of each IC into the holes of the PC board.
  • Page 9 Mount U2 and U4 to the right side panel as shown in Figure H. Insert the pins of each IC into the holes in the PC board. Then, with the hardware shown in Figure FA, attach each IC to the side panel. Solder the pins of the ICs to the PC board.
  • Page 10 HOW TO INSTALL CONNECTORS ONTO TRANSFORMER WIRES A connector will be placed in the primary wires of the transformer. This will allow you to remove the top panel from the trainer. Follow the procedures below. 1. Cut a six inch length off of each black primary wire. 2.
  • Page 11 MOUNT COMPONENTS TO PANEL Push the illuminated switch into the hole in the top panel with the lugs as shown in Figure J. Install the fuse holder with the side lug in the position shown in Figure J. Fasten the fuse holder in place with the nut as shown in Figure K.
  • Page 12 Bredboard 4-40 x 1/4” Flat Head Screw Top Panel Spacer #4 x 1/4” AB Screws Figure L REGULATED POWER SUPPLY 15VAC 15VAC 30VAC Figure M -11-...
  • Page 13 WIRE SWITCH AND FUSE HOLDER (see Figure N) Fuse Slide the line cord through the back panel as shown. Spread the three line cord wires apart 6” from the end. Strip the insulation off of both ends of the 6” red wire to expose 1/4” of bare wire. Pass the wire through the 1/2”...
  • Page 14 RESISTANCE ANALYSIS OF POWER SUPPLY Static testing of the power supply circuits. Do not plug the power supply into the 120VAC power supply source until all resistance readings check out. The values given below are approximate. See Figure O for locations of testing points. From To Right Side Panel GND 5-pin connector...
  • Page 15 Locations for Testing Points LM-7812 ••• ••• LM-7805 LM-7912 ••• ••• LM-317 Figure O -14- Plug of line cord On test points 4 - 14 use the leads of the diodes. 5 pin connector right 5 pin connector -20 5 pin connector +20 5 pin connector left •••...

  • Page 16: Fuse Replacement

    VOLTAGE ANALYSIS OF POWER SUPPLY Proceed with the voltage analysis only if the resistance readings were satisfactory. Place the top panel on the unit. If any capacitors are inserted backwards, the panel will shield you if they explode. Make sure that the ON/OFF switch is in the OFF position. Plug the line cord into the 120VAC power source.

  • Page 17: Power Supply Testing

    POWER SUPPLY TESTING Plug the trainer into a 120VAC outlet and switch to the “ON” position (the power switch should light). With a digital voltmeter, measure the voltage outputs at the power blocks. The +12V should measure between 11.4 and 12.6 volts. The 5V supply should read between 4.75 and 5.25 volts. The -12V supply should read between -11.4 and 12.6 volts.
  • Page 18 PROBLEM No voltage at negative variable output. No or low voltage at negative variable output with load. No +12V at output. No +12V at output with load. No -12V at output. No -12V at output with load. No +5VDC at output No +5VDC at output with load.

  • Page 19: Circuit Description

    This is because of the specially designed ICs used in the XK-700 Digital/Analog Trainer. Severe overloading or even shorting the output circuits will not damage the supplies. Special turn-off circuits in the ICs sense the overload and turn off the output.
  • Page 20 In practice, the current through the diodes is not as shown in Figure 2C. Because capacitor C1 has a charge after the first cycle, the diode will not conduct until the positive AC voltage exceeds the positive charge in the capacitor.

  • Page 21: Schematic Diagram - Power Supply Section

    SCHEMATIC DIAGRAM - POWER SUPPLY SECTION -20-...
  • Page 22 QUIZ - POWER SUPPLY SECTION INSTRUCTIONS - Complete the following examination and check your answers carefully. 1. AC voltage is supplied to the rectifier stages by the . . . A. step-up transformer. B. step-down transformer. C. 1 to 1 transformer. D.

  • Page 23: Specifications

    INTRODUCTION - ANALOG SECTION The Analog Section of your XK-700-SEMI was sent to you pre-assembled and all of the circuits are on the main PC board. To be certain that all circuits are functioning correctly and to become familiar with the circuit, we will do a circuit analysis.
  • Page 24 RESISTANCE ANALYSIS OF ANALOG SECTION Static testing of the analog circuits. Do not plug in the power supply into 120VAC power source until all resistance readings check out. The values given below are approximated. SET SW3 TO SQUARE WAVE (refer to top panel). From Pin 11 (U6) Pin 3 (U10)
  • Page 25 VOLTAGE ANALYSIS OF ANALOG SECTION Proceed with the voltage analysis only if the resistance readings were satisfactory. The values given below are approximate. The following measurements will be taken from the copper side of the PC board. Turn the unit on and place it upside down.
  • Page 26 5. Set VR8 fully clockwise from the copper side of the PC board, and adjust the DC OFFSET knob until the meter reads 0 volts DC. 6. Set the meter to the 20 volts AC range and slowly turn VR8 counter- clockwise until the meter reads 5.5 volts AC.
  • Page 27 CIRCUIT DESCRIPTION The function generator frequencies are produced by an XR-2206 integrated circuit. This IC is capable of producing high quality sine, square and triangle waveforms of high stability and accuracy. The output waveform can be both amplitude and frequency modulated by an external voltage.
  • Page 28 SCHEMATIC DIAGRAM - ANALOG SECTION -27-...
  • Page 29 INTRODUCTION - DIGITAL SECTION The Digital Section of your XK-700-SEMI also has been pre-assembled and all of the circuits are on the main PC board. To be certain all of the circuits are functioning correctly and to become familiar with the circuit, we will do a circuit analysis.
  • Page 30 USERS DESCRIPTION OF FRONT PANEL 1. CLK - A 4 pin output block for the function generator’s square wave. The amplitude of the signal is 5Vpp and the frequency is set by COARSE FREQ control. 2. TWO LOGIC SWITCHES - These are no bounce logic switches. Give one signal state change per movement of switch.
  • Page 31 RESISTANCE ANALYSIS OF DIGITAL SECTION Place the top panel onto the unit. Static testing of the digital section circuits. Do not plug the power supply into a 117 volt power source until all of the resistance readings check out. approximate. From Switch Position In down position...
  • Page 32 VOLTAGE ANALYSIS OF DIGITAL SECTION Plug the power supply into a 117 volt power source. The values given below are approximate. From Switch Position In up position In up position In up position In up position In up position In up position In up position In up position In up position...
  • Page 33 TESTING THE DIGITAL SECTION TESTING THE LOGIC INDICATOR FUNCTION There are eight logic indicators which you will be checking out. Put a wire to the 5V power supply and touch the “A” logic indicator test pin. The “A” LED should light up. Remove the wire and the LED should go out. Do the same for the B, C, D, E, F, G and H pins.

  • Page 34: Final Assembly

    FINAL ASSEMBLY Fasten the front panel in place with four #6 x 3/8” thread cutting screws, as shown in Figure S. Knob Figure S Fasten the PC board to the spacer Nut 7mm to the front panel with a fiber Washer 8mm washer and a 4-40 x 1/4”...
  • Page 35 INSTALL COMPLETED UNIT INTO CASE Place the strain relief onto the line cord as shown in Figure X. Squeeze the two sections together with pliers as shown in Figure Y. Then, insert the strain relief into the hole. Lay the trainer inside of the case as shown in Figure Z. Align the holes in the bottom case with those in the trainer and secure it into place with four #6 x 1/2 AB screws and four #6 washer as shown in Figure AA.
  • Page 36 CIRCUIT DESCRIPTION - DIGITAL SECTION THE DATA SWITCHES There are eight data switches labeled SW1 through SW8. The circuit is very simple. To perform the desired functions, there is a double throw double pole switch, wired as a single pole double throw. One end is connected to the 5V, the other to ground and the center lug is connected to the output.

  • Page 37: Schematic Diagram - Digital Section

    SCHEMATIC DIAGRAM - DIGITAL SECTION -36-...
  • Page 38 QUIZ - DIGITAL SECTION INSTRUCTIONS: Complete the following examination, check your answers carefully. 1. The logic switches consist of . . . A. two NAND gates and an SPST switch. B. three OR gates. C. two NAND gates and a DPDT switch. D.

  • Page 39: Pc Board Parts List

    PC BOARD PARTS LIST SYMBOL VALUE R1, R2, R14, R44 R36 - R43 R46, R47 R12, R16 - R19 1/4W 5% 1/4W 5% R7, R11 4.7k 6.8k 8.2k R4, R45, R48 R20 - R35 100k 100k VR1, VR2 VR4, VR6, VR7 100k SYMBOL VALUE...
  • Page 40 Elenco Electronics, Inc. 150 W. Carpenter Avenue Wheeling, IL 60090 (847) 541-3800 http://www.elenco.com e-mail: elenco@elenco.com...

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