Group 11. CriticalityFailure EffectMax Probability HighInjury to user may occur. LowLoss of some or all functions of the device. Customer dissatisfaction.

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Presentation transcript:

Group 11

CriticalityFailure EffectMax Probability HighInjury to user may occur. LowLoss of some or all functions of the device. Customer dissatisfaction may occur Criticality Levels

BlockComponent APower Supply BMicrocontroller CLCD and optical encoder DInfrared sensors EInfrared transmitters Functional Blocks

AB C D E

A Power Supply

Failure No.Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks A1Output = 0VFailure of any component in function block A or an external short Device will not function and may overheat. May cause burns to the user and melt the plastic casing. ObservationHigh A2Output > 5.5VZ1, R5 and R4Potential damage to IC2, LCD and IR Sensors. May cause loss of some or all functions of the device. ObservationLow A3Output out of tolerance Z1, L1, C1, C2, R7, D1, C3, R5 and R4. High ripple or out-of- spec operating voltage ObservationLow A Power Supply

B Microcontroller

Failure No.Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks B1Output continuously 1 IC2, softwareUnreadable display and loss of control of IR transmitters ObservationLow B2Output continuously 0 IC2, softwareLoss of control of display and IR transmitters ObservationLow B Microcontroller

C LCD and Optical encoder

Failure No.Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks C1LCD fails to output correct display. J2, IC2, softwareUnable to program additional hand gestures or view current command recognized ObservationLow C2Optical encoder not working J1, R2, R3, software Loss of input control; unable to access user menu to program additional hand gestures ObservationLow C LCD and Optical encoder

D Infrared Sensors

Failure No.Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks D1Output of IR sensor continuously 1 Damaged sensor, R24 – R32, software Recognition of hand gesture function impaired partially or totally Observation of LEDs tied to each sensor and input plausibility check by Microcontroller observation Low D2Output of IR sensor continuously 0 Damaged sensor, bad connection with header, software Recognition of hand gesture function impaired partially or totally Observation of LEDs tied to each sensor and input plausibility check by Microcontroller observation Low D Infrared Sensors

E Infrared transmitters

Failure No.Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks C1No output from IR transmitters IC2, R18, R19, R20, software Unable to control external sound system ObservationLowAlso can be caused by failure of IR LED itself C2Output not at the right frequency IC2, softwareUnable to control external sound system ObservationLow E Infrared transmitters