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PCB troubleshooting

General tips​

Any of these problems can cause a variety of "just not working right" errors in a circuit. Familiarize yourself with these troubleshooting checks and do them regularly.

  • Turn the PCB over and check all solder joints. A majority of problems are caused by insufficient or errant soldering. Familiarize yourself with what a good joint looks like in the Adafruit Guide To Excellent Soldering.
  • Is the chip in the right orientation? It will have a notch/dimple that should match the footprint outline on the PCB.
  • Does the battery have enough power? It should measure 9 volts. Try replacing with a fresh battery and see if that solves your issue.

Specific issues​

  • If there’s buzzing, check for any metal scraps stuck to the speaker.