Rx is a resistance, there are many resistances in the circuit diagram, arranged in sequence number, R1, R2. . .

Cx is a non-polar capacitor, anti-interference capacitor at the power input

IC integrated circuit module

Ux is IC (Integrated Circuit Element)

Tx is the test point (for factory testing)

Spk1 is Speaker (buzzer, horn)

Qx is a triode

CEx-electrolytic capacitor, CNx-capacitance, RNx-resistance, CONx-connector, Dx-Diode (diode), Lx-inductor/magnetic bead, LEDx-light emitting diode, Xx-crystal oscillator.

RTH (Thermistor)

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

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

D (diode)

W regulator tube

K switch

Y crystal

R117: The resistance on the main board, the serial number is 17.

T101: Transformer on the main board.

SW102: Switch

LED101: Light Emitting Diode

LAMP: (indicating) light

Q104 (E, B, C): transistor, E: emitter, B: base, C: collector