Gernsback Library #59 - Servicing Record Changers * CDROM * PDF

Description

Gernsback Library #59
Servicing Record Changers
by Harry Mileaf (1956)
228 pages in Adobe PDF format on CDROM
This book deals with one of the technician's biggest mechanical problems, the automatic record changer. The record changer has caused unusual confusion because it is mainly a mechanical item that employs very little electronic coordination. When the automatic record changer first entered the service scene and the technician attempted repairs, it  was comparable to an auto mechanic attacking a small radio. This situation has not been alleviated by manufacturers' literature because the average technician still lacks a complete understanding of the various record changers basic functions. The actions of trips, levers, pawls, idlers, cams and inclines baffle him, as weIl as the senseless-looking rotation and reciprocation that takes place at the underside of a record changer when it goes through its change cycle.
This book is presented very simply, so that the technician will have no trouble comprehending it. The subject is not treated as in other publications by discussing the functional assemblies as part of the overall changer. It is, on the other hand, presented with each functional assembly shown as a mechanical unit in its entirety. In this way the reader will become familiar, not only with a few changer types, but with the basic principles and variations of any automatic record changer he may encounter. The book bypasses for the sake of clarity the use of photographs for demonstration purposes. The underside of an automatic record changer is a three-dimensional complexity and a photograph of it only presents a maze of confusion. Instead, the functional assemblies will be presented as mechanical schematics, spread out so that their basic operation is obvious. Great pains have been taken by the author, Harry Mileaf, in preparing approximately 170 drawings. These show how simple an automatic record changer really is.
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