A printed circuit board (PCB or computer) mechanically supports and electrically connects electrical or electronic components. Components are generally soldered onto the PCB to both electrically connect and mechanically fasten them to it.
Controls of all kinds are integral parts of restaurant equipment operations. A control is a switch or other device by which a machine is regulated. A control may be manual or automatically operated. An electro-mechanical control typically consists of multiple relays, timers, and/or counters wired together on an enclosure panel. Electro-mechanical control is also referred to simply as "Relay Control", which is a more accurate term since solid state electronic relays, timers, and counters are standard components. Contactors, motor and compressor starters, valves, thermostats, and other output devices are used to turn on/off motors, indicator lights, heating elements, and other components used in the equipment.
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