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Elenco Electronics AK-700 Assembly And Instruction Manual

Pulse/tone telephone kit
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PULSE/TONE TELEPHONE KIT
MODEL AK-700/PT-323K
Assembly and Instruction Manual
Elenco
®
Electronics, Inc.
Copyright © 2006, 1994 Elenco
®
Electronics, Inc.
Revised 2006
REV-N
753700
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 AK-700

  • Page 1 PULSE/TONE TELEPHONE KIT MODEL AK-700/PT-323K Assembly and Instruction Manual Elenco ® Electronics, Inc. Copyright © 2006, 1994 Elenco ® Electronics, Inc. Revised 2006 REV-N 753700 No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.
  • Page 2 SECTION 4 - PARTS LIST If you are a student, and any parts are missing or damaged, please see instructor or bookstore. If you purchased this kit from a distributor, catalog, etc., please contact Elenco mail is at the back of this manual) for additional assistance, if needed. DO NOT contact your place of purchase as they will not be able to help you.
  • Page 3 QTY. DESCRIPTION Switch SPDT (Hook) (S2) Switch SPDT (S1, S3) Screw 1/4” (Keyboard) Screw 5/8” (Case) QTY. DESCRIPTION Microphone (MIC) (without leads) Buzzer (B) Modular Jack Label Telephone # (2 parts) Microphone Pad Buzzer Pad QTY. DESCRIPTION Battery Snap 9V Wire 22AWG Solid Yellow 6”...
  • Page 4 PARTS IDENTIFICATION BAG 1 Resistor BAG 3 Transistor Integrated Circuit (IC) Resonator BAG 5 Buzzer Microphone Buzzer Pad Microphone Pads Keypad PC Board Main PC Board Speaker (SP) Clear Bottom Case Diodes Epoxy Electrolytic Glass IC Socket Neon Bulb Modular Jack Label &...
  • Page 5 IDENTIFYING RESISTOR VALUES Use the following information as a guide in properly identifying the value of resistors. BAND 1 1st Digit Color Digit Black Brown Orange Yellow Green Blue Violet Gray White IDENTIFYING CAPACITOR VALUES Capacitors will be identified by their capacitance value in pF (picofarads), nF (nanofarads), or µF (microfarads). Most capacitors will have their actual value printed on them.
  • Page 6 SECTION 1 - INTRODUCTION The Model AK-700 / PT-323K is a push button electronic telephone kit. Your telephone is equipped with the following features: A) a tone/pulse switch, B) automatic redial (for pulse dialer) of up to 32 digits, C) a ringer turn off switch, and D) four neon bulbs to give a visual indication that the telephone is ringing.
  • Page 7 The Rotary Dial Telephone A simplified schematic diagram of the traditional rotary dial telephone is shown in Figure 3-2. The major parts of this telephone are explained below. Your kit is a newer electronic type telephone. When you build your telephone in Section 6, you will notice several differences between the traditional and electronic type telephones.
  • Page 8 Tone Dialer Tone dialing is accomplished with a keyboard of 12 keys arranged in 4 rows and 3 columns. As seen in Figure 3-4, low frequencies of 697, 770, 852 and 941 are associated with rows R1 through R4 and high frequencies of 1209, 1336 and 1477Hz are associated with columns C1 through C3.
  • Page 9 Receiver There are several different types of receivers. In principle, they work the same as the speakers in your radio and TV. The speaker consists of a small coil attached to a diaphragm. The coil is mounted over a permanent magnet as shown in Figure 3-6. Coil current in one direction causes the coil and diaphragm to be repelled from the permanent magnet.
  • Page 10 CONSTRUCTION Introduction The most important factor in assembling your Tone/Pulse Telephone Kit is good soldering techniques. Using the proper soldering iron is of prime importance. A small pencil type soldering iron of 25 - 40 watts is recommended. The tip of the iron must be kept clean at all times and well tinned.
  • Page 11 SECTION 5 - EQUIPMENT NEEDED Tools Needed (not provided) Long Nose Pliers Diagonal Cutters Note: The following equipment is not included unless indicated. Testing Equipment Needed: The test procedures are written for using AC and DC power supplies (only for final ringer test) or a 9V battery. If you don’t have a power supply for the ringer, transmit-receive and dialer tests, you can use a 9V battery.
  • Page 12 PC BOARD ASSEMBLY Identify and install the following parts as shown in Figure 6-1. After soldering each part, place a check in the box provided. R3 - 47kΩ Resistor (yellow-violet-orange-gold) R4 - 47kΩ Resistor (yellow-violet-orange-gold) LP4 - Neon Bulb LP3 - Neon Bulb (see Figure A) R5 - 10kΩ...
  • Page 13 Install the following parts. After soldering, place a check in the box provided. Identify the ringer switch as shown in Figure 6-2a. The ringer switch is mounted on the copper side of the PC board. Insert the switch tabs into the holes provided and solder the three terminals as shown in Figure 6-2b. Be sure that the switch is perpendicular to the PC board.
  • Page 14 If you have a 9VDC power supply, skip to the Ringer Test on page 14. RINGER TEST (Using a 9 Volt Battery) Test Equipment Needed • 9 volt battery (not provided). Use a fresh alkaline battery. • 9 volt battery snap. Testing is done with a 9 volt battery.
  • Page 15 RINGER TEST (Using a Power Supply) Test Equipment Needed (not provided) • 9VDC power supply. Since capacitor C1 blocks the DC voltage, it is shorted for this test (Figure B on page 11). 1. Set the ringer switch to the OFF position (refer to Figure 6-2b). 2.
  • Page 16 11. Unplug the telephone cord from the modular jack. 12. Peel the backing off of the buzzer side of the buzzer pad and place it on the buzzer as shown in Figure 6-6a. The pad goes directly on top of the three buzzer wires. Peel the second backing off of the buzzer mounting pad and stick the pad onto the solder side of the PC board as shown in Figure 6-6b.
  • Page 17 PC BOARD ASSEMBLY Identify and install the following parts as shown in Figure 6-7. After soldering each part, place a check in the box provided. Q5 - 9014 Transistor (see Figure C) R19 - 120Ω Resistor (brown-red-brown-gold) R21 - 100kΩ Resistor (brown-black-yellow-gold) C9 - 47µF Lytic Capacitor (see Figure F)
  • Page 18 Install the following parts. After each step is completed, place a check mark in the box. Identify two wires (4” red and 3” gray), microphone and microphone pad. Cut the 4” red wire down to 2” and the 3” gray wire to 2”. Use the 2” red and 2” gray stranded wires and strip 1/8” of insulation off of each end.
  • Page 19 Identify the speaker with pad, 3” gray wire, and the second half of the 4” red wire (the first half was used for the microphone). Cut a 2” piece from the 3” gray wire and strip 1/8” of insulation off of both ends. Solder the red wire to the speaker + and the gray wire to the speaker –...
  • Page 20 TRANSMIT - RECEIVE TESTS (Using a power supply) Before completing the assembly, we will want to power up and test the Transmit-Receive Section. See Figure 6-12 for these tests. 48VDC Power Supply 1kΩ 5W Resistor Type A Type B Green Green CAUTION: This test and succeeding tests involve 48VDC.
  • Page 21 c) Check transistors Q2, Q3, Q4 and Q5. Be sure that they are the proper type and that the emitter, base and collector leads are in the correct holes as shown in the assembly instructions. d) Check that the resistors just installed are the correct values as shown in the assembly instructions. e) Check the components just installed for bad solder joints and solder bridges.
  • Page 22 DIALER Circuit Description - The main elements of the Dialer Section are the keyboard and the dialer IC HM9102. These two components perform all of the functions of the rotary dial found in older telephones. The HM9102 is the tone/pulse switchable dialer with last number redial which is fabricated with CMOS technology.
  • Page 23 PC BOARD ASSEMBLY Identify and install the following parts as shown in Figure 6-15. After soldering each part, place a check in the box provided. C8 - .02µF Discap (.02 or 203) C10 - 30pF Discap (30) X - Resonator 3.58MHz C11 - 30pF Discap (30) C3 - 47µF Lytic Capacitor (see Figure F)
  • Page 24 KEYBOARD ASSEMBLY Insert the ribbon cable through the holes in the main PC board and solder as shown in Figure 6-16. Insert the ribbon cable through the holes in the keyboard PC board. Solder the ribbon cable to the keyboard’s PC board as shown in Figure 6-16.
  • Page 25 If you have a 48VDC power supply, skip to the Dialer Test on page 25. DIALER TEST (Using a 9 volt battery) 1. Be sure that the telephone cord is connected to your modular jack. Be sure that the telephone is off the hook (hook switch not depressed).
  • Page 26 DIALER TEST (Using a power supply) 1. With the power supply OFF, reconnect the test circuit as shown in Figure 6-12. Position the PC board so that the hook switch is not depressed (off hook). 2. Set the voltmeter to read 48VDC. Turn the power supply ON and adjust it for 48VDC on the meter. 3.
  • Page 27 FINAL ASSEMBLY See Figure 6-19. Place the PC board on the top case so that the ringer switch is in the ringer switch hole, the tone/pulse switch is in the tone/pulse hole and the two mounting holes on the PC board line up with the mounting posts on the top case.
  • Page 28 FINAL TESTS (Using a 48VDC power supply) Test Equipment Needed (not provided): • 48VDC power supply • Variac (only for ringer test) • 1kΩ 5W resistor • Isolation transformer (only for ringer test) • 48VDC voltmeter • Oscilloscope (only for voice test) •...
  • Page 29 10. To measure the input voltage to the telephone, connect the positive voltmeter lead to the negative terminal of the power supply and the negative voltmeter lead to point C. The voltage reading should be between 5 and 12.5VDC. Input Voltage: _________________ 11.
  • Page 30 2. Set the voltmeter to read 50VAC. Put the variac ON and adjust it to obtain 50VAC on the voltmeter. 3. Put the ringer switch ON. Plug in the telephone cord and position the telephone so that it is on hook (hook switch depressed).
  • Page 31 SECTION 7 - INSTALLING THE TELEPHONE Mounting the Cradle Select a convenient place for your phone. Place the telephone cradle against the wall and mark the center of the upper lobes of the two mounting holes as shown in Figure 7-1. Screw in the two mounting screws (not provided) to about 1/4”...
  • Page 32 If present, connect the black and yellow wires in the same way. If these are missing, merely connect the black and yellow spade lugs to the “B” and “Y” screws. This will keep them from shorting to the other wires. Place the modular jack cover on the base.
  • Page 33 SCHEMATIC DIAGRAM -32-...
  • Page 34 QUIZ Mark the box next to the letter with the correct answer. Answers on next page. 1) The ringer in the traditional rotary dial telephone utilizes . . . A. a speaker and microphone. B. a permanent magnet and armature. C.
  • Page 35 GLOSSARY DTMF Dual Tone Multifrequency. Electret Microphone A microphone made up of a capacitor with a dielectric that holds a permanent electric charge. Field Effect Transistor. Hook Switch A switch inside the telephone which closes when the receiver is lifted. Integrated Circuit.
  • Page 36 Elenco ® Electronics, Inc. 150 Carpenter Avenue Wheeling, IL 60090 (847) 541-3800 Website: www.elenco.com e-mail: elenco@elenco.com...

This manual is also suitable for:

Pt-323k