First Edition Of The Tape Recorder Servicing Manual

Project and Seminar Material For Electrical Electronics Engineering EEE

Project and Seminar Material For Electrical Electronics Engineering EEE


The essential instrument for any workshop are now and flutter meter electronic mill voltmeter audio Osillator distortion test set: NAB1 D/N and CCIR weighting filers IKH2 band pass filter tension Jauges (with scale ranging from milligram to kilogram) Torgue Gauges B.A and metric open and box spanners a wide variety of test and connecting leads toad resistors and parallel boxes.

Chapter One

1.0 Introduction

Sales of cassette recorder now account for a large share of the audio marteet and because of the enormous growth of interest in this system rather wore cutleries have been devoted to cassette than to reel-to-reel machines.
As far as servicing is concerned the principles are the same for classtee as for reel-to-reel recorder but a degree of ingenuity is frequently required when making mechanical adjustment on some of the chapter models for instance torque clutch and brafee adjustments are often made on a trial error basis by bending a lug with a pair of pliers until the required result is obtained.

For the entries in this manual I we have assumed that we are writing for a technician who is already conversant with electronic fault finding techniques and has some experience of servicing tape recorder however for those new to this aspect of servicing the notes in the remainder of this introduction may be of some value.

The circuit failed about are supposed to be fenown circuit that have been studied in general from life power supply circuit amplifier circuit oscillator modulator and demodulator circuit digital circuit life clock generators counters shift register discoverer multiplexes Rome RAMS etc are supposed to be familiar to the student from many year of study.

1.1 Sections Of Project

A project lifee an Essag has sections or parts these can be identified as:

  • a. Concept
  • b. Specification
  • c. Block diagram
  • d. Circuit design
  • e. Circuit diagram
  • f. Component sourcing
  • g. Prototyping
  • h. Construction or assembly
  • i. Testing
  • j. Packaging
a. Concept

A project starts with a concept born out of thought or idea of a need e.g to produce a dual voltage (+) power supply to supply circuits that use op amps that require positive and negative voltages to produce inter court EE department for school of engineering usually many ideals will cross ones mind the ability to put any into use depends on ones knowledge base will dictate the design steps. However the final

b. Specification

Will be made after testing has are specification of certain system as example of what we are taking about A.C power transformer

  • Supply voltage = 220y
  • Output voltage = 26y
  • Current output = 2a
c. Block Diagram

This is the diagrammatic representation of the sections that maker up the system with rectangular labeled boxes. The designer thinks of various section that should be put together to produce the desired result and draw them. These boxes are linteed with arrowed lines to show how signal moves from one box or block to another. The input to any block is on the left and the output on the right more than one block diagrams could be put together for a system each considered critically before one is finally accepted

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