Prepare Schematic Diagrams

If you will enter the board data manually, instead of translating CAD files, prepare the schematic diagrams.

1   Assign pin numbers.

a   Assign pin numbers (1 and 2) on two-lead components, such as resistors, inductors, and capacitors, that do not normally have any pin distinction.

You can use a blank PC board and an ohmmeter or continuity light to follow traces to help determine pin numbers.

b   Write the pin numbers on the schematic diagram.

Device pins up or to the left are labeled as pin 1, device pins down or to the right are labeled pin 2 (see Figure 1).

2   Assign electrical node names.

a   Assign a name to each electrical node in the circuit.

b   Assign node names to all unused device pins. This is important for shorts and opens testing and future considerations.

c   Write the node names on the schematic diagram.

Figure 1    Device pin numbering

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