Do you know the meaning of the letters on the board?
Rx is the resistance, there are a lot of resistance in the circuit diagram, numbered R1, R2…
Cx is the no polarity capacitor, the power input terminal, the anti-interference capacitor;
IC integrated circuit module;
Ux is the 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- capacitor, RNx- exclusion resistor, CONx- connector, Dx-Diode (diode), Lx- inductor / magnetic bead, LEDx- led, Xx- crystal oscillator;
RTH (thermistor);
CY (Y capacitor: high voltage ceramic capacitor, safety gauge);
CX (X capacitor: high voltage film capacitor, safety gauge);
D (diode);
W regulator tube;
K switch class;
Y crystal oscillator;
R117: the resistance on the main board is 17;
T101: transformers on the main board;
SW102: switch;
LED101: led;
LAMP: (indicating) lamp;
Q104 (E, B, C): crystal triode, E: emitter, B: base, C: collector.