Four stages of schematic recovery and the distinction from production releaseRecovery needs an evidence trail and a validation planDocumentBoth sides,orientation, markingsand sample identityTracePins, nets andevidence; preserveuncertaintyReconstructReadable circuit blocksand componentreferencesValidateIndependent connectionreview and agreed testsRecovered drawing ≠original design intent ≠production-ready releaseHidden layers, unmarked values and firmware remain explicit review items.³Ô¹Ïtv engineering illustration · conceptual; dimensions and acceptance are project-specific