Chapter 4: TroubleshootingTroubleshooting Definitions and Acronyms4-44 Service Manual4.5 Troubleshooting Definitions and AcronymsTerm DefinitionPCA Printed Circuit Assembly.PCB Printed Circuit Board.LCD Liquid Crystal Display.Mains AC Electric Power Source.DMM Digital Multi-Meter. An electronic measuring instrument that combinesseveral functions in one unit.Digital Multimeter An electronic instrument that measures electrical resistance.PE Protective Earth Grounding Point.FE Functional Earth Grounding Point.E-Base Elevating Base.T-Stat Thermostat.POST Power-On Self Test.Heat Control Processor Microcontroller located on the Power PCA that controls the radiant heater.Main ApplicationProcessorMicroprocessor located on the Control PCA that provides systemcommunication, control, and user interface.Audio Processor Microcontroller on the Control PCA that provides Audio and Power Failfunctions.NCAS Processor Microcontroller on the Alarm/Light PCA that provides Hands-Free AlarmSilence and Procedure Light control.HFAS and NCAS Hands-Free Alarm Silence and Non-Contact Alarm Silence (both refer to thesame feature).Probe Panel InterfaceBoardFlexible Printed Circuit Assembly used to connect the rail harnesses to theControl PCA.SpO 2 Flex Circuit Flexible Printed Circuit Assembly used to connect the SpO 2 I/F PCA to theSpO 2 Probe Panel Connector.HP Alarm High Priority Alarm - rapidly repeating two-tone alarm.LP Alarm Low Priority Alarm - single-tone alarm repeating every X seconds.
