Basic Troubleshooting Guide

This guide tries to cover basic troubleshooting: Some simple steps that can be taken by anyone with a multimeter and some spare time.

This document is continuously evolving, so you can expect modifications and updates.

These steps do not try to cover everything, just the steps that would solve the most common problems after a kit assembly.

When everything is assembled, and before plugging the module power in:

  • Are all components in their right place?
  • Sure? Double check.
  • Are all electrolytic capacitors soldered according to their polarity?
  • Are all transistors and diodes soldered according to their polarity?
  • Is the power connector properly oriented? Power cable you will be using as well?
  • Are there any solder spots touching any other one close by? If you have doubts check the schematic and/or CAD files.
  • Check if there is continuity between V+,V- or GND with your multimeter. If so, look for a short-circuit.
  • Do not place the IC’s yet. Leave them until after the soldering work.

When all these questions have positive answer plug it in, then…

  • Does your synth switch off or behave funny?
  • Double check the cable and power connection. It might be reversed.
  • Do any transistor or regulator overheat?
  1. ‘If no volts are present, double check power soldering points and paths for the ones that did not work.
  2. Use the multimeter to check continuity between the socket’s contact and soldered leg on the other side of the board.
  • Insert the IC’s, making sure they are in their right place, properly oriented and no legs are bent.
  • Do any of the ICs overheat? Double check their placing and polarity

See the flow chart below to help with these previous steps. You can also download it in PDF or DIA formats.