| 摘要 |
PURPOSE:To safely and simply execute adjustment by controlling the transmission of a horizontal (or vertical) synchronizing signal by means of a keyboard operation. CONSTITUTION:When the frequency of a horizontal (or vertical) deflection signal 10 is measured by a measuring instrument 11 so as to adjust the frequency of a free-running oscillator circuit 5, for example, the output of a gate circuit 13 normally comes to be H level regardless of the input level of the horizontal (or vertical) synchronizing signal 8 at the time of permitting a control signal 14 being the output of a custom integrated circuit 15 to be L level with CPU 2 by pressing the key of a keyboard 1. The operation shows a state where the horizontal (or vertical) synchronizing signal 8 is not transmitted to a horizontal (or vertical) deflection circuit 4. After adjustment, the control signal 14 being the output of the custom integrated circuit 15 is made to be H level with CPU 2 by pressing the key of the keyboard 1 again so that the gate circuit 13 transmits the horizontal (or vertical) synchronizing signal 8 to the horizontal (or vertical) deflection circuit 4. |
