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Summary of Contents for Elenco Electronics AK-200
- Page 1 CASSETTE PLAYER KIT MODEL AK-200 Assembly and Instruction Manual Elenco Electronics, Inc. Copyright © 1994 Elenco Electronics, Inc. Revised 2003 REV-L 753260...
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Page 2: Section 1 - Parts List
SECTION 1 - PARTS LIST If any parts are missing or damaged, see instructor or bookstore. DO NOT contact your place of purchase as they will not be able to help you. Contact Elenco manual) for additional assistance, if needed. Qty. - Page 3 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 mF (microfarads). Most capacitors will have their actual value printed on them.
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Page 4: Section 2 - Introduction
It is the goal of this project to educate the builder in the principles of magnetic tape recording and to teach the skills necessary to build this kit. The AK-200 Stereo Cassette Player is divided into two parts - Motion Control and Audio. This manual contains: 1) Detailed assembly instructions for each part. -
Page 5: Motion Control
Stop - Pushing STOP takes the AK-200 out of PLAY or FAST FORWARD mode and stops the tape. After opening the lid, STOP may be used again to pop up the tape cassette for easy removal. - Page 6 CONSTRUCTION Introduction The most important factor in assembling your AK-200 Stereo Cassette Player 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.
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Page 7: Section 5 - Assembly Instructions
SECTION 5 - ASSEMBLY INSTRUCTIONS TOOLS NEEDED: Small Blade Screwdriver, Phillips Screwdriver (small point size), Diagonal Cutters, Long Nose Pliers and a Soldering Iron (25 - 40 watts). PC BOARD ASSEMBLY - Your kit may contain several extra capacitors and wires. Please disregard these parts. Identify and install the following parts as shown in Figure 5-1. - Page 8 ASSEMBLY CONTINUED Identify and install the following parts as shown in Figure 5-2. After soldering each part, place a check in the box provided. Figure D Insert the IC socket into the PC board with the notch in the direction as the marking on the PC board.
- Page 9 TAPE DECK ASSEMBLY Solder two red 2.8” wires to the ON switch as shown in Figure 5-3. Mount the thumb wheel to pot VR1 as shown in Figure 5-4. See Figure 5-5. PUSH THE POT TO THE RIGHT AGAINST THE PC BOARD so that the thumb wheel will not hit the top or bottom plate when the unit is completely assembled.
- Page 10 CONNECTING THE PC BOARD - See Figure 5-6. The wires connected to the PC board should be positioned so that they do not touch the pulleys or drive belts and do not interfere with the placement of the batteries. Fasten the PC board to the tape deck using two 7/32”...
- Page 11 SECTION 6 - TEST PROCEDURE - MOTION CONTROL MOTOR SPEED TEST 1. Insert two “AA” size batteries into the battery compartment. See Figure 5-6 for polarity. 2. Set VR2 to midway between its two extremes. 3. Insert a tape cassette and push the PLAY button. If the tape runs out during testing, turn it over and play the other side.
- Page 12 SECTION 7 - TEST PROCEDURE - AUDIO Tests 3 through 7 require a voltmeter. If you do not have a voltmeter, skip these tests to go on to test 8. AUDIO TESTS See Figure 7-1 for test point connections. Figure 7-1 1.
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Page 13: Section 8 - Final Assembly
Figure 8-2. Press down to snap the clip onto the top plate. Put two “AA” size batteries (alkaline works best) into the AK-200. The polarity is shown on the case. Then, slide the battery cover in place as shown in Figure 8-2. -
Page 14: Section 9 - Specifications
SECTION 9 - SPECIFICATIONS Tests 3 through 7 require a voltmeter. If you do not have a voltmeter, skip these tests and go on to test 8. INPUT VOLTAGE RANGE: TAPE SPEED: AMPLIFIER IC SPECIFICATIONS: CHARACTERISTIC CONDITIONS Gain Distortion Distortion Maximum Output SECTION 10 - THEORY OF OPERATION - MOTION CONTROL The tape speed is determined by the voltage across... - Page 15 SECTION 11 - THEORY OF OPERATION - AUDIO MAGNETISM BAR MAGNETS - Figure 11-1a shows a bar magnet. The magnet is similar to a compass needle. It has a North seeking end and a South seeking end and thus its ends are labeled N and S. The magnetic field consists of lines of force (magnetic flux) which form closed paths through the magnet.
- Page 16 further negative, the sample again saturates at D. When the magnetizing force is brought positive again, the field strength follows the path D-E-F back to A. Figure 11-1b shows the hysteresis loop for a soft magnetic material. Note that the remnant magnetization and the coercive force are much less than for hard magnetic materials.
- Page 17 CIRCUIT DESCRIPTION - The Audio Section of the AK-200 Cassette Player consists of the AN7108 integrated circuit, its associated resistors and capacitors, and the phone jack. The AN7108 is a dual channel audio amplifier with a common volume control.
- Page 18 C) well above the audible range. D) 100 to 200Hz. 10. The Audio Section of the AK-200 Stereo Cassette Player consists of . . . A) a dual channel audio amplifier IC with a common volume control. B) a dual channel audio amplifier IC with individual controls.
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Page 19: Section 13 - Schematic Diagram
SECTION 13 - SCHEMATIC DIAGRAM AN7108 AN6650 -18-... - Page 20 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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