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COMPUTER COOLING SYSTEMS
Chapter 3 Computer Operator Control and Controlling Units

Electronics Technician Volume 06-Digital Data Systems
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PRINTED CIRCUIT BOARDS— Printed circuit boards (pcb’s) make up the majority of the computer’s functional areas. They contain all the circuitry that electronically manipulates the data that enters and leaves   the   computer. The  number,  size,  and arrangement   of   pcb’s   varies   from   computer   to computer. Pcb’s maybe keyed to ensure they cannot be inserted incorrectly. Some pcb’s are color coded. Pcb’s have   indicators   and   test   points   to   help   with maintenance. COMPUTER CONNECTIONS— The computer must have an organized way to exchange and route data and power signals internally and externally. CONNECTOR   ARCHITECTURE—   Con- nectors consist of a connector receptacle (jack) and a connector plug. They are designed to terminate pcb’s, conductors, and cables between electronic circuits within a system, between systems and subsystems, and their power sources. INTERNAL CONNECTORS— Connections are used inside the computer to interconnect the major individual units of the computer. EXTERNAL CONNECTORS— External con- nectors receive electrical power from power sources, send and receive data to and from other computers or digital equipment, and interconnect units of the same computer  system  together. CABLE  ARCHITECTURE—  A cable consists of two or more insulated conductors in a common jacket. Cables are used to receive electrical power from power sources, to send data to and receive data from other computers and digital equipment, and to interconnect units  of  the  same  computer. COMPUTER  COOLING  SYSTEM—  Cooling systems  are  needed  because  the  contents  of  any computer generate a lot of heat. Become  familiar  with  the  technical  manuals, diagrams, and layouts for the computers you have responsibility   for   maintaining.   Know   how   the computer system is configured and housed. Know the types of connections and cabling used. 2-27






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