1. Reliability & Safety Analysis
Team 6

2. Definition of Criticality
High – Failures that violate the safety of the user Medium– Failures that cause damage to the system Low – Failures that inconvenience the user

3. Parts Chosen For Analysis
NCV4274 (+3.3V Linear Regulator)
MC78M05 (+5V Linear Regulator)
dsPic33FJ256GP (Microcontroller)
CS4202 (Audio Codec)

4. FMECA Chart # Failure Mode Cause Effects Detection Criticality A1
0V on 3.3V output
Failure of 3.3V regulator
System stops functioning
Observation
Low A2
0V on 5V output
Failure of 5V regulator A3
Output = Input of 3.3V Regulator
System heats up, damages components, catches fire
Observation, Feeling or
smelling burning
High A4
Output = Input of 5V Regulator
Observation, Feeling or smelling burning B1
PWM Signal Remains Active
Failure of dsPic
Motors run continuously, string may break C1
Audio input = 0V
Failure of audio codec
System never tries to tune

5. Questions