Principles and Maintenance Diagrams of Novel Telephone Set Practical Unit Circuit

Author: Sun Yu Kai
Publisher:
Publish Date: 2004-05-01
Features: There are many varieties and models of telephones with features such as caller ID, IC, IP, recording, coin-operated, and computer billing. These telephones have a large market share, and maintenance personnel often encounter issues related to circuit diagram analysis during repairs. Due to their multiple functions, the circuits of these telephones are more complex than those of early-generation standard telephones. Therefore, many maintenance personnel or enthusiasts hope to have a practical, comprehensive, easy-to-understand, illustrated, highly readable, and versatile book on the principles and maintenance of various multi-functional telephones. This book is written to meet this requirement.
This book presents nearly 150 circuit diagrams of popular telephones on the market in recent years—such as caller ID, IC, IP, recording, coin-operated, and computer billing telephones—organized by their signal processing functions (caller ID, microcomputer control, line connection control, dialing, talking, hands-free talking, ringing and power supply, lock and anti-theft dialing, music hold, and recording circuits), in the form of unit circuits. Each unit circuit diagram is accompanied by a concise analysis. In the unit circuit diagrams, different arrow symbols or text are used to indicate their transmission or control paths, making it easy for readers to understand the process at a glance. The book also provides common fault troubleshooting methods for various circuits and a reference table for replacing integrated circuits in different types of new telephones.