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The meaning of those letters on the PCB

Rx is the resistance, a lot of resistance in the circuit diagram, according to the serial number, R1, R2. . .


Cx is a non-polar capacitor, power input capacitance interference


IC integrated circuit module


Ux is an IC (Integrated Circuit Component)


Tx is the test point (factory test)


Spk1 is Speaker (buzzer, speaker)


Qx is a transistor


CEx -Electrolytic Capacitor, CNx-Capacitor, RNx-Exclusion, CONx-Connector, Dx-Diode, Lx-Inductor / Bead, LEDx-LED, Xx-Crystal.


RTH (Thermistor)


CY (Y capacitor: high-voltage ceramic capacitors, safety regulations)


CX (X capacitor: high-voltage film capacitors, safety regulations)


D (diode)


W regulator


K switch class


Y crystal


R117: Motherboard resistance, number 17.


T101: Transformer on the motherboard.


SW102: switch


LED101: light-emitting diode


LAMP: (indicator) light


Q104 (E, B, C): Transistor, E: Emitter, B: Base, C: Collector

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