The main phase of assembly has been completed.
Errors take two forms, the kind that damage components and the kind that don’t. Neither is desirable, but the type that damages components will require you to find a replacement part. Before connecting the board for the first time, let's check some things.
Component Placement Errors
All components, their location, and proper orientation should be double-checked against the board layout.
|Polarity of the tantalum and electrolytic capacitors. The negative lead is usually identified with a stripe and a minus sign on it. However, some may have the positive lead marked. With most, the longer lead is the positive lead. The positive lead is identified on the PC board. Not all the capacitors have the same orientation; double-check them with reference to the PC board silkscreen.|
|Polarity of diodes. The band on the diode should align with the extra stripe on the PC board silkscreen.|
|The orientation of the integrated circuits with pin 1 correctly oriented to the dot, notch or bevel outline on the PC board.|
|All remaining components for type, orientation, placement.|
Soldering must be carefully inspected, preferably with a lit magnifier. If there are any suspicious solder connections, reflow the solder and check the result. Don't forget to check for solder-bridges. A solder bridge is where solder has flowed between two connections that should not be connected. This can happen when the connections are very close to each other. Solder bridges can be removed using a good grade of solder-wick and/or a solder removal tool (aka solder-sucker).
|Board checked and OK|