Power Test
- Apply 9–15 V DC
- Verify 5 V output from the regulator
- Check for excessive heat
MIDI IN Test
- Connect a MIDI source
- Confirm IN LED activity
THRU Output Test
- Connect downstream devices
- Verify all receive identical MIDI data
MatrixPortal Test
- Connect RX and GND
- Run firmware
- Confirm MIDI events are received
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