The schematic diagram is used to trace the circuit and its functions without regard to the actual physical size, shape, or location of the component devices or parts. The schematic diagram is the most useful of all the diagrams in learning overall system operation.
Top is a schematic diagram of a Sewing machine for JUKI IP-200 / LK-1900A. The sewing machines electromechanical system use to operate. In the grapes showing all the electronics components.
Following diagram is very use full for them who are professional technician. That will help to repair a circuit board.