Identify the title block
Check the schematic symbols legend
Find the power source and ground
Trace the circuit from input to output
Follow the signal flow
Read component labels and values
Note reference designators
Compare connections at each node
Identify series and parallel paths
Check switches, relays, and connectors
Look for junction dots and line crossings
Distinguish schematic lines from physical layout
Review voltage and current ratings
Verify polarity of polarized components
Use the datasheet for unfamiliar parts
Cross-check related subcircuits
Trace one section at a time
Confirm the function of each block
Recheck continuity of connected nets
Interpret the schematic as an abstract circuit map