Daryl SielaffBen McQuiston Will McKennaDavid Hartman Functional Blocks and FMECA Chart

Schematic Block A: Power

FMECA Chart Failu re No. Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks A1 Output = 0V Short to ground or any component in A Audio Amp fails to work, LCD fails to operate properly, short could lead to overheating ObservationHigh Overheating could cause fire or sparks A2 Output > 5V Failure of 5V regulator Could damage audio amplifier or LCD ObservationLow Regulators have shut off if voltage reaches unsafe values A3 Output > 3.3V Failure of 3.3V regulator Could damage mC or data bus ObservationLow Regulators have shut off if voltage reaches unsafe values A4 Output > 1.2V Failure of 1.2V regulator Potential damage to mC core ObservationLow Regulators have shut off if voltage reaches unsafe values A5 Output out of Tolerance Failure of any of the bypass capacitors Logic levels not properly achieved ObservationLow

Schematic Block B: USB

FMECA Chart Failure No. Failure ModePossible CausesFailure EffectsMethod of Detection CriticalityRemarks B1 USB drive not recognized Any part of the USB module fails, software Cannot complete file conversions or access existing IMS or MIIDI files ObservationLow Nothing of significance happens if the USB is not recognized B2 Unable to write to USB drive Failure of external memory, data bus, or software Cannot store IMS or MIDI files back onto USB drive ObservationLow Still able to actually hear audible music

Schematic Block C: Micro

Failure No. Failure Mode Possible CausesFailure Effects Method of Detection Criticali ty Remarks C1 Continual Output of logic low Failure of mC, or any components associated with it Data bus no longer providing reliable data, LCD output unpredictable ObservationLow C2 Continual output of logic high Failure of mC or any components associated with it Unreliable data bus, LCD output unpredictable ObservationLow C3 Image file not processed correctly Software, failure of data bus transmission If IMS created, not valid with matching image ObservationLow Music played will not match sheet music C4 IMS file improperly converted to MIDI Software, failure of data bus transmission MIDI will not match image ObservationLow Music played will not match sheet music FMECA Chart

Schematic Block D: External Memory

Schematic Block E: Audio Chip

D1 Data not properly stored or accessed in/from external memory Timing failure, bus fighting, Cannot access IMS for conversion or MIDI for playback ObservationLow Unpredictable results in this failure case D2 Accessing incorrect chips for given instructions Failure of chip select PLD Bus fighting, cannot do anything significant with any chip ObservationLow Nothing significant can be produced in this situation E1 No audio out Any part of audio block Unable to hear desired music ObservationLow E2 Distorted or noisy audio out Noisy power signal, speaker damage, failure of audio amp Unable to interpret desired music ObservationLow E3 Uncontrollably loud output Unpredictable audio amplifier behavior Harm to user, unable to hear music ObservationHigh Hearing loss possible FMECA Chart

Schematic Block F: LCD F F

FMECA Chart F1 LCD not functioning properly Failure of any connections to mC, software Backlight off or too bright, no way to navigate menu ObservationHigh LCD backlight could overheat and lead to burns F2 Pushbuttons or RPG have no effect Failure of connections to mC, software Cannot navigate menu ObservationLow