Visit：1745 Date：2020-08-24

The circuit board (PCB) is arranged according to the electrical schematic diagram (SCH), and the text symbols representing the elements should be consistent with the schematic diagram.

The text symbol can be checked GB7159.

For example: L—reactor or inductor, X—terminal, plug, socket, JK—may refer to relay or switch, UC—power supply, P1—may refer to measuring equipment or clock.

In fact, because the standard is only recommended, and after many changes, some design units have their own regulations. Designers have their own hobbies and cannot get the only answer. It is best to check the component list and electrical schematic diagram.