| 摘要 |
a high voltage control unit(50) which generates a control signal preventing the generation of high output voltage and horizontal output voltage at the monitor by detecting whether the high voltage signal from a high voltage output circuit(5) is above some level and when a signal indicating the absence of synchronization is outputted from a synchronizing signal discriminating unit(7); and an oscillation-preventing unit(60) which prevents generation of the control signal of a horizontal voltage and the high voltage control unit(50).
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