| 摘要 |
PROBLEM TO BE SOLVED: To improve the operation precision of a protective circuit which is provided in a power source line supplying power to a horizontal deflecting circuit and a fly-back transducer and to prevent a malfunction owing to dew condensation, etc. SOLUTION: The circuit is constituted in such a way that the both ends of the diode of a photocoupler 16 are connected to the both ends of a resistance R1 where load current is permitted to flow, the emitter terminal of the phototransistor of the photocoupler 16 is grounded, the resistance R2 is connected between the collector terminal of the phototransistor of the photocoupler 16 and a power source and the collector terminal of the phototransistor is connected to a power source control circuit 15. |
