Figure 11. Failure Mode and Effects Analysis

I.D. #	Item/Functional Identification (Nomenclature)	Function	Failure Modes and Causes	Mission/ Phase/ Oper. Mode	Failure Effects			Failure Detection Method	Compensating Provisions	Severity Class
					Local Effects	Next Higher Level	End Effects
001	CR3 Rectifier Diode	Half-Wave Rectifier	Short	Intrusion Detection	Loss of rectification of Vin	Loss of fixed 5VDC output	Loss of Alarm	None	None	I
002			Open	Intrusion Detection	Loss of current to series regulator	Loss of output from 5VDC Regulator	Loss of Alarm	None	None	I
003			Parameter Change	Intrusion Detection	Slight change in rectified voltage level	No change in output voltage	No effect	None	None	IV
004	R1 Resistor Fixed Film 100 ohms	Current limit	Open	Intrusion Detection	Loss of current to series regulator	Loss of output from 5VDC Regulator	Loss of Alarm	None	None	I
005			Parameter Change	Intrusion Detection	Slight change in input voltage level to Q1	No change in output voltage	No effect	None	None	IV
006			Short	Intrusion Detection	Loss of current limiting protection	Possible overstress of circuit	Degraded operation	None	None	III
007	C11 Capacitor Tantalum Elec 47mF	Filter	Short	Intrusion Detection	Loss of current supply to Q1	No output from 5VDC Regulator	Loss of Alarm	None	None	I
008			Open	Intrusion Detection	Loss of filter for series regulator input	Possible instability in 5VDC output voltage	Degraded operation	None	None	III