Page 1 : CHAPTER, , , , , 1.1, ELECTRONIC MECHANIC, , The study of radio, television, record player and, , , , , , changer, tape recorder, video recorder, radar, ansmitters and computers etc, is done under the vast, branch of science called Electronics, Presently, the, Progress and prosperity of a country is assessed on, , , , the base of its capabilities in the field of electronice, Electronics is being utlised in each and every field of, industry and human life. In this way, the branch of, nce which deals with the motion and applications, nd ions through materials and through, ‘space is called electronics. The science based on the, behaviour of electrons is called Electronics,, In fact, it is not easy to differentiate between an, electrical mechanic (electrician) and an electronic, mechanic, because almost all modern electrical, equipments are employing electronic devices, such as, junction diodes, transistors, (Cs and even, microprocessors. Therefore, electrical mechanics, require sufficient knowledge of electronics or electronic, mechanics are required for the maintenance and, repairs of electrical and electronic equipments., ‘A mechanic capable to maintain and repairan electrical, or electronic equipment is called an electronic, mechanic. Further, such mechanics are also required, fo be updated regularly to meet the requirements of, electronic industries in view of the developments,, modifications and new inventions being done in the, field of electronics., , 1.2. SAFETY PRECAUTIONS, ‘An engineer or a mechanic must necessarily observe, safety precautions while operating, repairing or, maintaining electrical and electronic equipments., Failing to it, he may have to suffer heavy physical loss, and moreover loss of life. The principal safety, precautions are as under, , (9 Do not touch any electrical or electronic equip, ment unless it is not ensured that no unwanted, current is flowing through the equipment's body, (ie. the equipment’s body is not live), , (ii) Always use rubber shoes, matting or dry-wooden, furniture for isolating yourself from an earth contact while working on electronic equipments., , (ii) Do not put a Main-switch to ON unless it is ensured that no mechanic is working on the main, line., , , , , , Trade Introduction,, Hand Tools and Electrical Safety, , , , , , (iv) Always be acquainted with the theoretical details, before starting a practical work. Collect necessary, tools, equipments, circuits etc, and display them, on the table as per your convenience., , (¥) Always disconnect the equipment to be repaired, Up trom the main line by pulling the plug top and, not by pulling the cord, , (v) Always discharge high voltage filter capacitors, after opening the equipment and before starting, repairs by short circuiting the capacitor terminals, with a piece of wire,, , (vip Do not start a repairing job unless you are, tensionless or otherwise an accident may happen, While repairing any equipment your motto should, be - May you not be able fo repair up the equipment, but the same must not be damaged any more by, you., , 1.3. FIRST AID, , The possibilties of an accident are greatly reduced, by observing safety precautions, even though an, aceldent may happen any time, When phase wire i in, mechanic's hand and his body comes in contact with, earth contact then a current stars to flow trough his, body. It may cause breathing suppression, reduction, in pulse count, blisters on the body or even death due, to heart failure, The following frst id should be provided ian accident, has occurred, () Put the Main-switch to OFF so as to release the, Victim from electric contact,, (if the victim is unconscious or blisters have, developed on his body then immediately arrange, for a doctor., (ii) Star the folowing fist ai procedure til the doctor, is available, (2) Loosen or remove victim's shoes, clothes te., but take care that blisters are not broken up, , (6) Protect the victim trom cold by covering his, body with a blanket, , (©)It the victim's breathing appears to be, suppressed then remove the crowd from his, surroundings. Ifthe vie is in @ room then, ‘open all the doors and windows so as to, enable him to breathe in tresh ait., , (a) Remove aritcial teeth, tobacco, ete. from, viet’ mouth and str aif rspration, procedure for restoring fis normal breal