Identify the title block, drawing number, revision, and scale
Find the legend for symbols, abbreviations, and line types
Determine the power source and ground reference
Trace the circuit path from input to output
Follow each wire or net between components
Read component labels and reference designators
Check component values and ratings
Note polarity markings on diodes, capacitors, and ICs
Identify switches, relays, connectors, and test points
Use node labels to connect separated parts of the same circuit
Compare related sheets using cross-references
Distinguish signal lines from power lines
Look for junction dots and line crossings
Verify whether crossing lines are connected or not
Read from left to right and top to bottom when possible
Break the schematic into functional blocks
Trace one function at a time
Check input conditions and output behavior
Compare the schematic with the physical layout or board
Use datasheets for unfamiliar parts
Confirm pin numbers on integrated circuits
Identify feedback loops and control paths
Mark expected voltages and signals at key points
Recheck continuity between connected points if needed