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The most common construction problems found on version 1.5 PCBs is one or more of the three preset potentiometers shorting onto traces that run between its legs. The arrow in the image at left shows the sharp projections that can break through the solder mask to cause this short. The image at right shows the PCB traces that are close to the holes for the pot.
The solution is simple - don't force the pots into their holes before you solder, or, if you have already soldered them, simply lever them up, a leg at a time, while applying heat to the solder joint.
Here are some symptoms that are caused by the "pot short out" problem.
Last updated 27 June 2003
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