Table
| Process Step | Potential Failure Mode | Potential Failure Effect | S | O | D | RPN | Recommended Action |
|---|---|---|---|---|---|---|---|
| Resistor R1 | Open circuit | No voltage drop/current | 7 | 2 | 3 | 42 | Ensure proper soldering, use a higher quality resistor |
| and verify with ohmmeter | |||||||
| Diode D1 | Open circuit | No charge to the capacitor | 8 | 3 | 3 | 72 | Check diode orientation, use a high-quality diode |
| Short circuit | Complete short of the path | 9 | 2 | 4 | 72 | Implement proper protections and verify with a multimeter | |
| IC1 (NE555 Timer) | No oscillation | No signal from the timer | 9 | 2 | 4 | 72 | Cross-check pin connections, |
| - | - | - | - | ensure input voltage is within range | |||
| IC1 (NE555 Timer) | Wrong frequency | Incorrect output frequency | 8 | 3 | 4 | 96 | Verify component values in the RC timing circuit, |
| - | - | - | - | use precision components | |||
| Power Supply V1 | Under-voltage | Insufficient power to circuit | 10 | 3 | 2 | 60 | Use a regulated power supply, |
| - | - | - | power supply verification before parts installation | ||||
| Schematic Assembly | Incorrect connections | Malfunction of the circuit | 9 | 4 | 3 | 108 | Double-check connections against the schematic, perform continuity tests |
| Test and Verification | Unrecognized defect | Operational failure | 10 | 1 | 5 | 50 | Implement comprehensive testing procedures |
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