| 摘要 |
PURPOSE:To simplify a circuit constitution by attaining an RGB input mode through a switch selecting an RGB input side, setting an RGB input to zero and adjusting the spot cut-off of a CRT. CONSTITUTION:Where a horizontal switch SW4 is turned off, a yoke 8 is driven to turn off a transistor TRQ2. As a result the switch SW3 is switched as shown by solid lines, and a television or video signal inputted from a terminal 3 is selected. When the switch SW4 is turned on, the yoke 8 stops its drive, and the TRQ2 is turned on to change over a switch SW3 to a side shown by broken lines. In this state an amplifier 2 directly adjusts an output from a DC reproudction circuit 4, instead of applying the input signal to an input terminal 5 for signals R, G and B, whereby the cathode bias point of the CRT when a spot appears horizontally can be adjusted.
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